The pH of a solution that contains 5 % (w/w) ammonia solution and has a density of 0.977 g/ml is 11.13.
NH3 + H2O ⇄ NH4 + OH-
Kb = [NH4+][OH-] ÷ [NH3]
1.8 x 10 to the power -5 = x2/0.1
[OH-][H+] = 1.34 x 10 the power -3 [H+] 0.977 = 11.13
pH stands for potential of hydrogen - To trace the pH scale, a group of standard solutions whose pH has been established by international agreement can be employed. The potential difference between a hydrogen electrode and a standard electrode, such as the silver chloride electrode, is measured using a concentration cell with transference to obtain the primary pH standard values. The pH of aqueous solutions can be measured using a glass electrode, a pH meter, or a color-changing indicator. pH measurements are important in many fields, including chemistry, agronomy, medicine, water treatment, and many more. Indicators can be used to monitor pH since their colors alter as the pH varies. The hue of a test solution can be visually compared with a reference color chart to determine pH precisely to the closest whole integer. More precise readings are possible if the color is measured spectrophotometrically using a colorimeter or spectrophotometer. A universal indicator, which displays a continuous color change from roughly pH 2 to pH 10, is composed of several indicators.
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which evidence was most informative for evaluating whether normal vesicle movement occurred in vale's reconstituted system?
To power the molecular motors that move vesicles, fast axonal transport (FAT) needs constant energy across vast distances.
How does the vesicle migration look?Vesicle motions have been seen to have a clear direction of movement and to copurify with kinesin motor activity. The current body of research supports the theory that kinesin and retrograde motors attach to the correct vesicle to power vesicle movements in vivo.
How are vesicles propelled by motor proteins?Organelles and vesicles are transported by myosin and kinesin motor proteins as they move through the cytoskeleton using the energy produced by adenosine triphosphate (ATP) breakdown.
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classify each statement about electromagnetic radiation as true or false.
Classification of each statement about electromagnetic radiation:
True statement:
(2) The product of the frequency and wavelength of electromagnetic radiation is constant.
(3) The light from the sun includes multiple types of electromagnetic radiation.
(4) X-ray radiation has shorter wavelengths than microwave radiation.
False statement:
(1) Visible light has a lower frequency than infrared radiation.
(5) X-ray radiation has more energy than gamma radiation.
(6) The speed of electromagnetic radiation varies with frequency
What is electromagnetic radiation?Waves-based radiation that has an electric and magnetic field. It derives from both natural and artificial sources. From low energy to high energy, electromagnetic radiation can have different intensities. It consists of x-rays, gamma rays, infrared, visible, and ultraviolet light as well as radio waves and microwaves.
Radio waves, microwaves, infrared, ultraviolet, gamma, and x-rays are all types of EM radiation. Cosmological sources (such as the sun and stars), radioactive substances, and man-made gadgets are some examples of sources of EM radiation. The dual wave and particle character of EM are evident.
True Statements:
The product of the frequency and wavelength of electromagnetic radiation is constant and equal to speed of light.The light from the sun includes multiple types of electromagnetic radiation which are radio waves, micro waves, infrared waves, visible light, x rays and gamma rays.X-ray radiation has shorter wavelength than microwave radiation.False Statements:
Visible light has lower frequency than infrared radiation.The speed of electromagnetic radiation varies with frequency.X-ray radiation has more energy than gamma radiation.To know more about electromagnetic radiation refer to:
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The complete question is as follows:
Classify each statement about electromagnetic radiation as true or false: Visible light has a lower frequency than infrared radiation The product of the frequency and wavelength of electromagnetic radiation is constant, The light from the sun includes multiple types of electromagnetic radiation X-ray radiation has shorter wavelengths than microwave radiation, X-ray radiation has more energy than gamma radiation The speed of electromagnetic radiation varies with frequency
Question 6 (1 point) What is the formula for diboron hexahydride?
The formula for diboron hexahydride is B₂H₆.
Covalent compounds are covalent bonds between nonmetal elements and nonmetal elements. Nonmetal elements such as hydrogen (H), boron (B), carbon (C), helium (He), oxygen (O), nitrogen (N), bromine (Br), and fluorine (F). Naming covalent compounds using prefixes.
1 = mono2 = di3 = tri4 = tetra5 = penta6 = hexa7 = hepta8 = octaWe use the prefix for the first part and the second part before the name of the elements. But we didn't use prefixes if the first part has one atom. The prefix we use is according to how many atoms are in the compound. Example
CO₂ = 1 atom C and 2 atoms ODiboron hexahydride
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If the frequency factor is 1.2*10^13/s , what is the activation barrier?
The rate constant of a reaction at 33 Degrees Celsius was measured to be 5.8×10^-2 /s.
Therefore the activation barrier of this reaction is EA=84lkJ⋅mol−1, If the frequency factor is 1.2*10^13/s, The rate constant of a reaction at 33 Degrees Celsius was measured to be 5.8×10^-2 /s.
The Arrhenius equation states that
k=A⋅e−EA/R⋅T
Taking logarithm of both sides gives
lnk = lnA−EA/R⋅T
Where, the rate constant of this particular reaction
k=0.055ls−1;
The frequency factor (a temperature-dependent constant A=1.2×1013ls−1as given in the question;
The ideal gas constant R=8.314lJ⋅mol−1⋅K−1;
Absolute temperature (T=32+273.15=305.15lK) at which the reaction take place;
EA the activation barrier (a.k.a. activation energy ) the question is asking for
Solve the second equation for EA:
EA/R⋅T=lnA−lnk
EA=(R⋅T)⋅(lnA−lnk)
=(R⋅T)⋅lnA/k
=8.314lJ⋅mol−1⋅K−1⋅305.15lK⋅ln(1.2×1013s−10/055s−1)
EA=8.4⋅104lJ⋅mo−1
Therefore the activation barrier of this reaction is 84lkJ⋅mol−1
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When viewed from Oswego, how high will Polaris appear in the sky?
The North Star, or Polaris, can be found above the North Pole on the north celestial pole. It is directly overhead when viewed from the North Pole and lies on the northern horizon when viewed from the equator (at an altitude of 0 degrees) (at an altitude of 90 degrees).
Polaris' altitude in the sky is what?The northern horizon is 30 degrees above the location of Polaris. Until the traveler reaches the geographic (as opposed to magnetic) North Pole, this pattern will continue. Polaris is straight overhead at this latitude (90 degrees), 90 degrees above the northern horizon.
Is Polaris' altitude always 90 degrees?Polaris is always 90 degrees above the horizon if you are looking at it from the north pole (latitude 90 degrees), and it is also true at intermediate latitudes.
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if i need to consume 20.0 grams of fructose (c6h12o6) each day, how many milliliters of juice, a solution with a fructose concentration of 0.500 m, should i drink?
C6H12O6 is the chemical formula for Glucose. If you need to consume 20.0 grams of (C6H12O6) each day, then you should drink 693.8 milliliters of juice.
What is Molarity ?The concentration of a solution is modeled using molarity. The number of moles of solute dissolved in one liter of a solution is its molarity. As a carbohydrate,
(C6H12O6) has a molar mass of 180.16 g/mol.
As a result, moles of (C6H12O6) are calculated as follows: 25g/180.16g/mol = 0.138765mol.
Thus, volume of (C6H12O6) equals moles of glucose/molarity equals 0.138765mol/0.20M = 0.6938 L = 693.8 ml, where 1000 ml equals 1 liter.
Thus, 693.8 ml of a (C6H12O6) solution containing 0.20 M are required.
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What is the Lewis symbol for germanium? Ge Ge Ge Ge
Symbol Ge The chemical element germanium has the atomic number 32 and the letter Ge assigned to it.
How is the Lewis symbol located?The Lewis sign is produced by adding dotting to the external energy all around an element's symbol to represent its electrons.For many common goods, the group number of the entity corresponds to the number of dots.Below is a list of the Lewis Symbols of various elements.
Do GE's valence electrons total four?
The valence electrons of carbon, silicon, and germanium each number four.These have valence & conduction bands that are separated with energy band gaps that are, respectively, (Eg)C, (Eg)Si, and (Eg)Ge.
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blue food coloring can be oxidized by household bleach
Household bleach, which contains OCl, can cause blue food coloring to oxidize because of the food coloring's slow absorption during the bleaching process.
Bleach is a substance that, typically by oxidation, can erase or lighten the color.
There are various bleach varieties, including:
Sodium hypochlorite is commonly found in chlorine bleach.
In oxygen bleach, hydrogen peroxide or a substance that releases peroxide, such as sodium perborate or sodium percarbonate, are present.
Calcium hypochlorite, or bleaching powder, is used.
Other bleaching agents include calcium peroxide, zinc peroxide, sodium peroxide, carbamide peroxide, chlorine dioxide, bromate, sodium persulfate, sodium pyrophosphate, sodium per silicate, and their ammonium, potassium, and lithium analogs (such as benzoyl peroxide).
Although most bleaches are oxidizing agents, there are various methods for removing color. As an effective reducing agent and bleach, sodium dithionite is one example.
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Complete Question is:
Blue food coloring can be oxidized by household bleach (which contains OCT-) to form colorless products, as represented by the equation above. A student used a spectrophotometer set at a wavelength of 635 nm to study the absorbance of the food coloring over time during the bleaching process. In the study, bleach is present in large excess so that the concentration of OCI- is essentially constant throughout the reaction. The student used data from the study to generate the graphs below.
Experiment 13 Report Sheet A Carbonate Analysis: Molar Ve me of Carbon Dioxide Lob Sec Date Nome A. Sample Preparation and Setup Apparatus Calculation of mass of CaCO, sample for analysis (from Prelaboralory Assignmen, question 2) Desk No. Unknown sample no. Trial 2 L Mass of sample (g) Trial I o1300g 2 Mass of generator + sample before reaction (g) 47613123 125s, 3 Instructor's approval of apparatus 222 C. Determination of Volume. Temperature, and Pressure of the Carbon Dioxide Gas 1. Initial reading of volume of water in CO,-collecting graduated cylinder (mL) 31,0m 2 Final reading of volume of water in CO,-collecting 62.4 mL graduated cylinder (ml) 34,0 mL 3 Volume of CO (g) collected (L) 34,p 4. Temperature of water ("C 5 Barometric pressure (torr) 6 Vapor pressure of H,O at C (torr) ANGH hast ost 7. Pressure of dry CO (g) (torr) D. Amount of Carbon Dioxide Gas Evolved St AnttrFtt 0416 0014 1. Mass of generator + sample after reaction (g) A-D 2 Mass loss of generator s mass CO, evolved (g) mol 3 Moles of CO, evolved (mol) Experiment 13 187 110 Trial 2 Triel P E Modar Volume of CO, Gas 2,4234 1. Pressure cf dry CO(e) (atw) See Part C7 2 Volume of CO.ie) at STP () See eqeation 13.4. mol) See equation 13.2 Molar volume of COue) at STP 4. Average moter volume of CO.e) at STP (es F. Percent CaCO, in Mistures 1. Moles of CaCO, in sample from mol CO, generated (moly See equation 13.1. 2. Mass of CaCO, in sample (e) 3. Mass of original sample (g) 4. Percent of CaCO, in sample (%) Average percent of CaCO, in sample (%) 5. Laboratory Questions Circle the questions that have been assigned I. Part A.I. 7he water for the pan (Part A.3) is not saturated with CO,, Will the reported percent CaCO, in the original sample be too high, too low, or unaffected? Explain 2. Part A.2. Suppose 6 M HCI is substituted for the 3 M HCI in the procedure. What would be the consequence of this substitution? Explain. 3 Part A.3. A few drops of HC(ag) spilled over into the CaCO, sample prior to firmly seating the stopper and prior to collecting any CO(e). As a result of this poor technique, will the repor too low, or unaffected? Explain. t CaCO, in the sample be too high, pe 4. Part A.4. The rubber stopper has a small crack resulting in a not-tight seal. How will this affect the calculated molar volume of CO. too high, too low or unaffected? Explain. 5. Part C.I. The water level in the CO-(g)-collection cylinder is higher than the water level outside the cylinder. See margin drawing a. Is the wet CO, gas pressure greater or less than atmospheric pressure? Explain. b. An adjustment is made to equilibrate the water levels. Will the volume of the wet CO, gas increase or decrease? Explain. . The student chemist chooses not to equilibrate the inside and outside water levels. Will the reported number of moles of CO, generated in the reaction be too high, too low, or unaffected by this carelessness? Explain. art C.I. An air bubble accidentally mpletion of the reaction. How does this error affect the reported moles of CO-(g) lected-too high, too low, or unaffected? Explain. enters the CO,-collection graduated cylinder after the If a large 2 is present in the original sample, how does it affect the reported blar volume of the CO,(8)-too high, too low, or unaffected? Explain. cent CaCO, in the sample-too high, too low, or unaffected? Explain. amount of calcium sulfate [it does not form a gas with the addition of wpw.pn
The percent of CaCO3 in the sample = mass of CaCO3 / mass of the sample. The average value is calculated by adding the values from two trails and dividing it by two.
What is Molar mass?
In chemistry, the molar mass of a compound is defined as the mass of a sample of that compound divided by the amount of substance, which is the number of moles in that sample, and is measured in moles. Molecules, properties of matter. Molar mass is the average of many instances of a compound, which often differ in mass due to the presence of isotopes. Most commonly, molar mass is calculated from standard atomic masses, so it is a global average and a function of the relative isotopic abundances of constituent atoms on Earth. Molar mass is useful for converting between the mass of a substance and the quantity of a bulk substance.
Molecular weight and formula mass are commonly used synonyms for molecular weight, especially for molecular compounds. However, most authoritative sources define it differently. The difference is that molecular weight is the mass of a particular particle or molecule whereas molar mass is the average of many particles or molecules.
Therefore, The percent of CaCO3 in the sample = mass of CaCO3 / mass of the sample. The average value is calculated by adding the values from two trails and dividing it by two.
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what is the measure of the efficiency of a chemical reaction?responsespercent yieldpercent yieldannual yieldannual yieldtheoretical yieldtheoretical yieldactual yieldactual yield
Percent yield is the metric used to gauge the effectiveness of chemical reactions. Option A is hence the right choice.
Determining the yield of the reaction in relation to the theoretical value has been used to determine a chemical reaction's efficiency.
Although there are numerous ways to gauge a reaction's efficiency, calculating the yield is by far the most popular method.
The amount of the product expected to be produced by the listed reactants has been used as the theoretical value. The concentration measured in a lab following a chemical reaction has been the actual yield.
The efficiency of the reaction increases and decreases depending on how close the value of actual yield is to theoretical yield.
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What parameter does the detector measure directly?
a. Absorbance
b. Total incident light shining on the cuvette (lo)
c. Light transmitted through the cuvette (lt)
d. Wavelength
Total incident light shining on the cuvette is the parameter that the spectrophotometer's detector measures directly.
A spectrophotometer is a device used to gauge electromagnetic radiation strength at various wavelengths. The spectrophotometer measures the light intensity of a sample by passing a light beam through it. Each substance in the solution either absorbs or transmits light of a particular wavelength when it is passed through the sample using a light beam. A spectrophotometer, which consists of two instruments, a spectrometer and a photometer, is used to measure spectrometry. Light sources are necessary for spectrophotometers to function. Light sources can be different in nature and utilise a wide band of wavelengths including visible, UV and IR due to the large range of samples.
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complete the valence molecular orbital diagram for oxygen o2
Two oxygen atoms are depicted with twelve valence electron dots on the Lewis diagram of O2. Six are positioned such that each oxygen atom has four valence electrons on one side.
The oxygen molecule has a stable structure thanks to the four valence electrons that combine to create two shared pairs of covalent bonds. The elementary electric charge of the electron, a subatomic particle, is a negative one. Due to their lack of known components or substructure, electrons, which are part of the first generation of the lepton particle family, are typically considered to be elementary particles. A nucleus and one or more electrons attached to the nucleus make up every atom. One or more protons and many neutrons make up the nucleus.
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Construct the MO diagram of He2+ molecule. Label the bonding and antibonding molecular orbital. Show how bond order is calculated.
He2+ molecule's MO diagram's computed bond order is 0.5.
What is the magnetic makeup and bond order of the He2 molecule?The bond order of $ H 2 + $ is therefore $ 0.5 $. One unpaired electron can be seen in the antibonding orbital when looking at the electrical arrangement. Therefore, $He 2+$ is paramagnetic.
Which of the following best represents the h2 He2 stability order?Thus, the proper sequence of stability is: "H 2gtH 2" and "He 2" are capitalized. Additionally, because the hydrogen molecule ion has only one electron and no electron-electron repulsion, "H 2" (plus) is a little bit more stable than "He 2" (plus). Due to its higher bond order (bond order = 1) than He2+ (bond order = 1/2), the He22+ ion is more stable.
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The smallest atomic unit which maintains the physical properties of a compound is a(n)
Answer:
The smallest atomic unit which maintains the physical properties of a compound is called a molecule.
Explanation:
A molecule is the smallest unit of a compound that can exist independently and still retain the properties of that compound. It is made up of two or more atoms that are bonded together, and it is the basic unit of a chemical compound. The atoms in a molecule are held together by chemical bonds, which are the attractive forces that hold the atoms together. Molecules can be made up of different types of atoms, and the type and arrangement of atoms in a molecule determine the properties of the compound.
Copper has a specific heat of 0.34 J/g C. What does the value of the specific heat tell you about copper compared to water? (specific heat of water=4.184 J/g C)
Copper will experience a high-temperature change as it has a low specific heat as compared to water.
What is the specific heat capacity?Specific heat can be defined as the heat needed to change the temperature of one unit mass (1 kg) of material at constant volume by 1 °C. The S.I. unit of the specific heat capacity can be written as J/kg. The thermal capacity of a material can be described as a physical property of a substance.
The mathematically specific heat capacity can be calculated as :
Q = m C ΔT, Where C is the heat capacity.
As given the values of the specific heat, the high specific heat means that the substance will take more heat to increase its temperature by one degree.
Therefore, when copper and water provided equal amounts of heat, the temperature of the copper metal with the low specific heat has a high change compared to water.
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at what point in the titration does the concentration of acetic acid equal the concentration of the acetate ion
If you were titrating acetic acid with a base, the equivalence point would be where you had added as much base to the solution as acetic acid (i.e. moles of base vs moles acid). This is the point at which all of the acetic acid has been neutralised.
solution's concentration is described as the quantity of solute in a given size of the solution. It can be explained as follows: Mass divided by the mass percentage of a remedy corresponds mass of solute/mass of solution 100. Subtract the solute's mass from of the overall volume of the solution. Calculate C = m/V, where m seems to be the solute's mass and V is indeed the volume of the solution. Divide this same values you discovered for mass and volume to discover the concentration of your solution.
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Draw the electron configuration for neutral atom of vanadium.
Vanadium has the following electron configuration: 1s2 2s2 2p6 3s2 3p6 4s2 3d3.
Which element has a 1s2 2s2 2p6 3s2 3p6 4s2 3d3 electrical configuration?Vanadium (V), if you're thinking about a neutral atom, has that specific arrangement of electrons. The atomic mass of Vanadium, a transition metal in the fourth row, group 5 of the periodic table, is 23, which is the same as the atomic mass of the atom you're looking for, with which it shares a similarity.
What is the atomic structure of vanadium?The atomic radius of vanadium is 0.134 nm, and its electronic configuration is (Ar)(3d)3(4s)2. Vanadium has a body-centred cubic crystal structure with one atom per lattice point at ambient temperature. 0.303 nm is the lattice parameter.
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Choose Every Molecule That Will Show Only Two Signals, With An Integration Ratio 2:3, In 1H NMR Spectra.
The 1H NMR spectrum contains a total of four signals.
In 1h NMR, what is integration?NMR Spectroscopy integration. In NMR, the integration reveals how many protons a particular signal is made up of. Let's say that it is the ratio of the protons behind each signal to be more precise.
In 1H NMR spectroscopy, which of the following compounds exhibits two signals?Thus, the 1H NMR spectrum of the molecule methyl acetate exhibits two signals. Why only two signals for a molecule having total six hydrogens? The reason for this is chemical equivalency. The three Ha protons in the methyl group, which is bound to C=O, can be used to separate the six hydrogens in total into two groups.
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Which of the following is an example of intermolecular forces?
O hydrogen bonding
O covalent bonding
O fonic bonding
O metallic bonding
D Question 2 The strongest intermolecular forces present in a sample of HOF are
O hydrogen bonds
O covalent bonds
O dipole-dipole forces
O London dispersion forces
1.)Hydrogen bonding is a example of intermolecular force where H interract with more electronegative element like O, N , F . 2.) Hydrogen bonding is present in HOF which is more stronger then london dispersion force.
Intermolecular force are those that bind molecules together. Figure illustrating the intramolecular attraction within an H-Cl molecule and the intermolecular attraction between two H-Cl molecules. Forces between molecules are known as intermolecular forces. Three physical states—solid, liquid, and gas—are formed depending on the strength of intermolecular forces. The attraction between molecules is known as intermolecular force. These forces are crucial because they aid chemists in determining a substance's physical characteristics, such as its state, melting point, boiling point, etc. The melting and boiling points rise in proportion to the strength of the intermolecular forces.
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g which represents a spontaneous reaction and what is the correct e 0 cell? 1.40 4.16 -0.04 1.36
g which represents a spontaneous reaction and option b 4.16 is the correct e 0 cell
spontaneous reaction is The value of E represents a half-reduction cell's readiness (i.e. it is a reduction potential). When compared to a conventional hydrogen half-cell, whose standard electrode potential is set at 0.00 V, it demonstrates how many volts are needed to get the system to undergo the desired reduction. A assessment of the potential for equilibrium is the standard electrode potential. There is indeed a voltage differential between both the electrode and the electrolyte termed the potential of the electrode.lower the Erred value. acts as anche and reducing • larger the value of Ered. act as ocidoing agent- and act as Cathode here, When compared to the larger value of E of ar, the reduction in Ft is not spontaneous, despite loving its value of 1°.
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why is it important to align the cuvette in the sample holder the same way each time?
Because the cuvette's walls can vary in breadth, this is the case. If you don't enter it exactly the same way each time, it will change how much light passes through the sample and will have an impact on your results.
The cuvette has a line that must line up with the sample holder's line because of this. hence, readings had no impact.
The cuvette's route length in the spectrophotometer should always stay the same.
This is because the radiation should have a constant path length as it goes through the sample inside the cuvette. By doing this, the cuvette through which the light will travel won't get scratched.
Scratches on the cuvette will result in inaccurate measurements of the concentration or absorbance that is being assessed, producing inaccurate findings.
Therefore, the line on the cuvette is always aligned with that of the sample holder in order to establish a uniform path length and obtain accurate findings.
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what is the name for elements located in group 2 of the periodic table? responses alkali metals alkali metals halogens halogens alkali earth metals alkali earth metals carbon family
The periodic table's group 2A (or IIA) is made up of the alkaline earth metals beryllium (Be), magnesium (Mg), calcium (Ca), strontium (Sr), barium (Ba), and radium (Ra). They are more resistant and less reactive than the Group 1A alkali metals.
What is The periodic table's group 2A?The name was given to them because, at the temperatures that the early alchemists could work with, the oxides of these metals did not dissolve in water to form basic solutions; instead, they remained solids. The alkaline earth metals are too reactive to exist in their elemental form in nature, just like the Group 1A elements.Two of the valence electrons in the highest-energy orbitals of the alkaline earth metals are in this state (ns2). They possess higher ionization energies than alkali metals from the same era due to their lower size. Most of the time, ionization of alkaline earth metals results in a 2+ charge.The melting values of the alkaline earth metals are significantly higher than those of the alkali metals. For example, beryllium melts at 1287 oC, magnesium at 649 oC, calcium at 839 oC, strontium at 768 oC, barium at 727 oC, and radium at 700 oC. They are soft and light in comparison to many transition metals, yet they are tougher metals than the Group 1A elements.Because the 2+ cations have larger charge densities than the Group 1A cations, the salts of Group 2A metals are less soluble in water than those of Group 1A, but many Group 2A salts are at least moderately soluble. Some Group 2A salts, such as Epsom salt (MgSO47H2O) and gypsum (CaSO42H2O), form hydrates when they form a strong connection with water molecules.To Learn more About periodic table's group 2A refer to:
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draw the lewis structures for the following ions:
H2S, SiCl4, BeF2, CO2 - 3, and HCOOH molecules and ions should all have Lewis structures drawn.
The Lewis structure of the molecule HCOOH is composed of three outside bonding atoms and one central carbon atom.
What shape does H2S take?Two of the six valence electrons that sulfur possesses—out of a total of six—are used to form each of the two S–H bonds. This leaves two lone pairs, which, through crowding and repulsion, prevent the bonding electrons from forming a linear shape. As a result, the form is a "V," with a 92-degree angle between the two SH bonds.
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find the quantity of a gas in moles if 6.38 l at 358oc has a pressure of 955 torr. group of answer choices 0.285 mol 207 mol 0.155 mol 0.273 mol 6.45 mol
Given that,
P = 955 torr = 1.25658 atm
V= 6.38 L
T = 358 C = [273 + 358] K
n= PV/RT
= 1.25658 atm *6.38 L/0.0821 L atm/Molk * [273 + 358] K
=0.155 mol
Result:
number of mols = 0.155 mol
One of the four fundamental states of matter is gas. A pure gas can be composed of individual atoms, elemental molecules composed of one type of atom, or complex molecules composed of several atoms. A gas mixture, like air, has a number of pure gases.
A gas is a fluid with no defined size or shape. When a gas is enclosed in a closed container, it expands to fill the container. The air you breathe is an example of a gas. The most common type of gas is air (the air we breathe is a gas). It is also a mixture of several gases, including nitrogen, oxygen, and carbon dioxide.
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The conjugate acid of CH3COO- is _____________. The conjugate acid of F- is _______________. The conjugate acid of CN- is ______________. The conjugate acid of PO43- is _____________.
The conjugate base of CH3COOH is _________________. The conjugate base of HCl is ______________. The conjugate base of H2SO4 is _________________. The conjugate base of H2S is _______________. The conjugate base of H3PO4 is _________________. The conjugate base of NH4+ is ___________________.
Na2HPO4 is soluble and exists in two units of the cation Na+ and one unit of the anion __________________. The conjugate base of this anion is _____________________. Na3PO4 is soluble and exists in three units of the cation Na+ and one unit of the anion ___________________. The conjugate acid of this anion is __________________.
The conjugate acid of CH3COO- is CH3COOH, The conjugate acid of F- is HF , The conjugate base of CH3COOH is CH3COO-, The conjugate base of HCl is Cl-, The conjugate base of H2SO4 is HSO4-, The conjugate base of H3PO4 is H2PO4-, The conjugate base of NH4+ is NH3, Na2HPO4 is soluble and exists as two units of Na+ and one unit of HPO4^2-, Na3PO4 is soluble and exists as three units of Na+ and one unit of PO4^3-, the conjugate acid of this anion is HPO4^2-
According to the Brnsted-Lowry acid-base theory, a conjugate acid is a chemical that is created when an acid donates a proton (H +) to a base; in other words, it is a base that has had a hydrogen ion added to it, as in the opposite reaction, the base loses a hydrogen ion. When an acid gives up a proton, it transforms into a base, and when a base takes one on, an acid is created. A conjugate acid-base pair is made up of an acid and a base that only differ by whether a proton is present or not.
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a chemistry student needs of pentane for an experiment. by consulting the crc handbook of chemistry and physics, the student discovers that the density of pentane is . calculate the mass of pentane the student should weigh out.
A chemistry student should way out 57.56 grams of pentane for the experiment he is willing to perform.
Given,
Density of pentane = 0.626 grams/ml
Volume of the pentane = 60 ml
The above data can be used to find the mass of the pentane by using the relation between density, mass and volume which is given as:
Density = mass of substance/ volume of substance
⇒ Mass of pentane = Density of pentane X Volume of pentane
Substituting the values we get,
Mass of pentane = 0.626g/ml X 60ml = 57.56 grams
Hence, to perform the experiment the chemistry student should weigh 57.56 grams of pentane.
The given question is incomplete and the complete question is given as,
A chemistry student needs 40.0 mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the student discovers that the density of pentane is 0.626 g cm^3. Calculate the mass of pentane the student should weigh out.
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What are two qualities of nonmetals? Describe each
Answer:
In the elemental form, non-metals can be gas, liquid or solid. They aren't shiny (lustrous) and they don't conduct heat or electricity well. Usually their melting points are lower than for metals, although there are exceptions. The solids usually break easily, and can't bend like metals
Explanation:
Ryan has a condition called achalasia, where the muscles in his esophagus refuse to relax and allow food to enter his stomach. Ryan has seen specialists for this issue but his last treatment involving a laparoscopic myotomy did not fix it. In fact, Ryan has seen a substantial increase in the amount of acid reflux he has since the procedure. He hears about an experimental new treatment called POEM that is being tried in a hospital across the country. Ryan sends a letter to the surgeons on staff, asking that he be considered for this treatment. In this situation, what healthcare role is the hospital experimenting with POEM filling?
ANSWERS
1. primary care
2 secondary care
3 tertiary care
4 quaternary care
Answer:
1. primary care
Explanation:
Draw the Lewis Structure for TeO3 and determine the electron domain geometry. Draw the Lewis Structure for TeO3 and determine the number of lone pair(s) on the central atom. Draw the Lewis Structure for TeO3 and determine the name of the molecular geometry. Draw the Lewis Structure for TeO3 and predict the polarity. Draw the Lewis Structure for TeO3 and predict the predominant intermolecular force. Draw the Lewis Structure for TeO3 and determine the hybridization on Te.
The Lewis Structure for TeO3 is attached in the image given below, and the electron domain geometry is Tetrahedral.
Lewis structures, often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures (LEDS), are diagrams that depict the interactions of atoms inside molecules as well as any lone pairs of electrons that may be present. Any molecule with a covalent link, as well as coordination compounds, can have a Lewis structure. Gilbert N. Lewis, who first described it in his 1916 article The Atom and the Molecule, gave the Lewis structure its name. Lewis structures add lines between atoms to represent shared pairs in a chemical bond, extending the idea of the electron dot diagram. Each atom's position within a molecule is indicated by its chemical symbol in Lewis structures. Lines divide atoms that are linked together. Pairs of dots are displayed next to the atoms to represent the additional electrons that form lone pairs. While main group elements of the second period and beyond frequently respond by gaining, shedding, or sharing electrons until they have attained a valence shell electron configuration with a full octet of (8) electrons, hydrogen (H) can only form bonds that share two electrons.
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3 hg 2 cr3 3 hg2 2 cr in the above redox reaction, use oxidation numbers to identify the element oxidized, the element reduced, the oxidizing agent and the reducing agent.
The substance that gains electrons is being reduced and is the oxidizing agent
How do you distinguish between oxidizing and reducing substances in a redox reaction?Divide the reaction into a net ionic equation and then into half-reactions. The material that loses electrons is being oxidized and is the reducing agent. The material that obtains electrons is being reduced and is the oxidizing agent.
The species that loses electrons is said to be oxidized, whereas the species that acquires electrons is said to be reduced. We may detect redox processes by utilizing oxidation numbers, which are assigned to atoms in molecules by assuming that all bonds to the atoms are ionic.
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