The number of moles in 7.52 × 10²² molecules of silicon dioxide is 0.125 moles.
How to calculate number of molecules?The number of moles in a substance can be calculated by dividing the number of molecules by Avogadro's number as follows:
no of moles = no of molecules ÷ 6.02 × 10²³
According to this question, a sample of silica gel (SiO₂) contains 7.52 x 10²² molecules of silica. The number of moles can be calculated as follows:
no of moles = 7.52 × 10²² ÷ 6.02 × 10²³
no of moles = 1.249 × 10-¹
no of moles = 0.125moles
Therefore, 0.125 moles are present in 7.52 × 10²² molecules of silica.
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Calculate E∘cell for the balanced redox reaction.
PbO2(s)+4H+(aq)+Sn(s)→Pb2+(aq)+2H2O(l)+Sn2+(aq)
E°cell for the balanced redox reaction is -0.531 V.A redox reaction can be defined as a chemical reaction in which electrons are transferred between two reactants participating in it.
How is an EO cell calculated?Calculating E° cells given K either K provided Eo cell can both be done using this equation. The following formula can be utilized if the RT is constant and the temperature is 298 K: Find the empirical formula (K) for the reaction using F o (0.025693V/n) and K is -0.34V.
PbO2 (s) + 4 H+ (aq) + Sn (s) --> Pb2+ (aq) + 2 H2O (l) + Sn2+ (aq) AI Recommended
How can E° cell be calculated using common reduction potentials?Using E° cell table, calculate the E° readings using the conventional reduction potentials. Identify E°cell as E°cathode - E°anode in step 4. Step 5: We can use G = -nFE°cell after calculating E° cell and determining the amount of moles of electrons.
To know more about A redox reaction can be defined as a chemical reaction in which electrons are transferred between two reactants participating in it.
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which options correctly describe the procedure used to determine the number of significant digits in a reported quantity? (select all that apply.)
A) and D) correctly describe the procedures used to determine the number of significant digits in a reported quantity.
What is explanation for determining significant digits?Up until the first nonzero digit, work your way right from the left. This is correct because the first nonzero digit is considered the most significant digit and all digits to the right of it are considered significant. If there is a decimal point, all digits starting with the first nonzero digit (moving to the right) are significant.. This is correct because when a decimal point is present, it indicates that the digits to the right of it represent fractional parts of the number and are therefore significant.
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Which options correctly describe the procedures used to determine the number of significant digits in a reported quantity? Check all that apply: A)Start at the left and move right until you reach the first nonzero digit.
B)Zeros between other nonzero digits are not significant if there Is no decimal point.
C) Start at the right and count all the nonzero digits In the number.
D) AIl digits from the first nonzero digit onward (going to the right) are significant, if there Is a decimal point.
E)If the quantity has no decimal point; zeros to the right of the nonzero number may or may not be significant
Physical properties can be used to compare and classify substances. The process below demonstrates a physical property of sugar
1. Place a spoonful of sugar in a bowl. 2. Observe the shape and color of the sugar. 3. Note the texture of the sugar. The process below demonstrates a physical property of sugar.
What is physical property?
A physical property is a characteristic of a material or substance that can be observed and measured without changing the material's chemical composition. Examples of physical properties include color, shape, density, melting point, boiling point, electrical conductivity, and solubility.
A physical property is a characteristic of matter that can be observed and measured without changing the chemical identity of a substance. Examples of physical properties include color, density, hardness, melting point, boiling point, and thermal conductivity.
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a mixture of coarse sand and sugar is 45.0 percent sand by mass. 120.0 grams (g) of the mixture is placed in a fine-mesh cloth bag and dunked repeatedly in lake michigan. after drying, the mass of the contents of the bag equals:
After drying, the mass of the contents of the bag equals is X=54g if 45.0 percent sand by mass. 120.0 grams of the mixture is placed in a fine .
Why does mass mean?6vmass, the central act of worship of the Roman Catholic Church, which culminates in celebration of the sacrament of the Eucharist. The term mass is derived from the ecclesiastical Latin formula for the dismissal of the congregation .
What's mass in physics?mass, in physics, quantitative measure of inertia, a fundamental property of all matter. It is, in effect, the resistance that a body of matter offers to a change in its speed or position upon the application of a force. The greater the mass of a body .
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according to the bohr model of the atom, the single electron of a hydrogen atom circles the nucleus...
According to the Bohr model of the atom, the single electron of a hydrogen atom circles the nucleus in Specific, circular parts or orbits.
The Bohr model depicts electrons in fixed orbits. According to the model, electrons in atoms move in circular orbits around a nucleus in the center and are only able to orbit in a stable condition when they are in specific fixed circular orbits that are located a specific range of distances from the nucleus.
In his atomic model, he put forth the idea that an electron travels in a predetermined circular path or orbit around the nucleus, orbiting at a given energy level.
As a result of the foregoing, we can conclude that the response, According to the Bohr model of the atom, a hydrogen atom's lone electron circles the nucleus in distinct, elliptical sections or orbits, is correct.
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a 10.0 gram sample of impure silicon is 99.44% silicon by mass and the rest is carbon. the mass of carbon present in the sample is:
(E) 0.056 g weight of carbon in the sample is the answer that is correct.
Is silicon a type of metal or not?Silicon is really a metalloid, a material that falls somewhere between the two categories of metals and non-metals. There is no clear definition of what falls under the category of metalloid, although in general, metalloids exhibit characteristics from both metallic and non-metals.
Given mass percent of silicon = 99.44 %
So, mass percent of carbon = (100-99.44) %
= 0.56 %
Hence, mass of carbon = 0.56 % of 10 g
= (0.56/100)×10 g
= 0.056 g
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The Complete Question is :
a 10.0 gram sample of impure silicon is 99.44% silicon by mass and the rest is carbon. The mass of carbon present in the sample is: Select one: OA. 9.944 grams OB. 99.44 grams OC. 0.56 grams O D. 5.6 x 10³ grams O E 0.056 grams
which of the following statement is correct? group of answer choices forming bonds lowers the energies of electrons. higher energy electrons are less chemically reactive. o has higher ionization energy (ie) than f. if the energy of electron in an atom is low, less energy is required to remove it from the atom.
Bonds form because favorable interactions between orbitals and the electrons in those orbitals allow the system to become more stable. High ionization energy means low reactivity.
Do more electrons necessarily imply less reactivity?With more shielding electrons in an atom, reactivity diminishes. A negative charge is present in electrons. The outer-shell electrons are thus pushed back by the inner-shell electrons. The nucleus's attraction to the surrounding electrons is reduced by this repulsion.
Why does bonding make energy go down?Because covalent bonds carry less energy than individual atoms would, they are more stable. The diagram shows how the potential energy of the system drops as the atoms first start to interact because the attractive attraction outweighs the repulsive force.
Are more reactive people more electron-affinity?Reactivity often rises as electron affinity does. The idea of electron affinity and the nonmetals' reactivity are closely related.
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copper(I) ions in aqueous solution react with NH3(aq) according toCu^+(aq) + 2NH3(aq) yields Cu(NH3)2^+(aq), Kf=6.3*10^10 M^-2calculate the solubility (in g . L^-1) of CuBr(s) in 0.23 M NH3(aq)answer must be in g/L
The copper(I) ions in aqueous solution react with NH₃ (aq). The solubility of the CuBr in 0.23 M NH₃ is 57.24 g/L.
The solubility equilibrium of the CuBr :
CuBr(s) ⇄ Cu⁺(aq) + Br⁻(aq)
Ksp = [Cu⁺] [ Br⁻] = 6.3 × 10⁻⁹
[Cu(NH₃)₂]⁺ , Kf = 6.3 × 10¹⁰
Kf = [Cu(NH₃)₂]⁺ / [Cu⁺] [NH₃]²
= 6.3 × 10¹⁰
K = [Cu(NH₃)₂]⁺ [Br⁻] / [NH₃]²
= ([Cu(NH₃)₂]⁺) / [Cu⁺] [NH₃]² ([Cu⁺] [ Br⁻] )
K = Kf ×Ksp
K = 4 × 10²
CuBr + 2NH₃ ⇄ [Cu(NH₃)]⁺ + Br⁻
K = [Cu(NH₃)]⁺ [ Br⁻] / [NH₃]²
4 × 10² = x × x / ( 0.23 - 2x)²
x = 0.39
The solubility of CuBr = 0.399 × 143.5
= 57.24 g/L
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Use the molar solubility 3.27 * 10-11 M in pure water to calculate Ksp for NiS
This value indicates that NiS is very slightly soluble in water and thus will not readily dissolve in it.
What is soluble?Soluble describes substances that can be dissolved in a liquid. When a substance is soluble, it is able to form a homogenous solution with the liquid, meaning that the substance will spread out evenly throughout the liquid. Common examples of soluble substances include sugar and salt, which can be dissolved in water. Other substances, such as oil, are insoluble and will not dissolve in a liquid.
The Ksp of NiS is equal to the molar solubility of NiS in pure water raised to the power of two. This is because NiS dissociates into two ions in water (Ni2+ and S2-). Therefore, the Ksp of NiS can be calculated as follows:
Ksp = (3.27 x 10-11 M)2 = 1.06 x 10-21
This means that the solubility product constant (Ksp) of NiS is equal to 1.06 x 10-21. This value indicates that NiS is very slightly soluble in water and thus will not readily dissolve in it.
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What orbitals are used to form each bond in methanol, CH3OH? Be sure to answer all parts. All C-H bonds are formed from C ... sp 3 -H ... sp The C-O is formed from C ... 3sp O ... 3sp The O-H bond is formed from O ... 3sp -H ...sp
sp³ hybridized orbitals form the CH, CO and OH bonds in methanol.
What is hybridization?Hybridization is the process by which the energy of individual atom orbitals is redistributed to create new orbitals with equivalent energy. The hybrid orbitals are the new orbitals that emerge during this process.
All C-H bonds in methanol are formed from the overlapping of the carbon atom's hybridized sp³ orbital with the hydrogen atoms 1s orbital.
The C-O bond in methanol is formed from the overlapping of the carbon atom's hybridized sp³ orbital with the oxygen atom's hybridized sp³ orbital.
The O-H bond in methanol is formed from the overlapping of the oxygen atom's hybridized sp³orbital with the hydrogen atoms 1s orbital.
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Calculate the pH of a 0.20 M solution of KCN at 25.0 ∘C.
Express the pH numerically using two decimal places.
ph =
The pH of the solution can be defined as the negative logarithm of the concentration of hydrogen ions or H+. In the equation form it is, pH = -log[H+]. These are the important equations to formulate when it comes to equilibrium pH problems.
KCN is actually a basic salt coming from the reaction of a weak acid, HCN, and a strong base, KOH. We know that HCN is the weak acid, the SCB is CN-. The reaction would be written as:
CN- + H2O ⇔ HCN + OH-
The important data that is the equilibrium constant of acidity of the weak acid is : Ka for HCN is 6.2×10^-10. Then, let's do the ICE(Initial-Change-Equilibrium) analysis.
CN- + H2O ⇔ HCN + OH-
I 0.2 m ∞ 0 0
C -x ∞ +x +x
-----------------------------------------------------------
E 0.2-x +x +x
The value x actually denotes the number of moles that CN- reacted. There is no value for H2O because the solution is dilute which means that water is added to the solution such that H2O>>>CN-.
Since the value of OH- is also calculated to be x, then OH-=0.001788 m. Consequently,
pOH = -log(0.001788) = 2.75
Calculation is pH = 14 - pOH = 14 - 2.75
pH = 11.25
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The element that corresponds to the electron configuration 1s22s22p63s23p64s13d5 is Cr. For the three ions formed by this element, 2+, 3+ and 6+ charged respectively, write the electron configuration and explain the property of paramagnetism or diamagnetism for each species.
Due to the unpaired electrons, it is paramagnetic. Because it has 3 unpaired electrons (4-152 252 2pt 332 3p 3d), it is paramagnetic. For G2+, all electrons are coupled (132 257 24us$ 752 3p 30).
What does chemistry mean by paramagnetic?The presence of a dipole moment magnetic in an unpaired electron causes paramagnetism. According to QED, an electron's magnetic moment results from its orbital motion and spin characteristics, giving it quantum-style angular momentum.
Why are bonds paramagnetic?The majority of atoms with partially filled orbitals are paramagnetic due to the existence of unpaired electrons within the material, while there are some outliers like copper. Unpaired electrons have such a magnetic magnetic dipole because of their spin, which makes them behave like small magnets.
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Which processes result in the release of carbon? Check all that apply.
Animals break down food molecules to obtain energy.
The remains of producers are broken down by decomposers.
The remains of consumers are broken down by soil decomposers.
A) Animals break down food molecules to obtain energy. B) The remains of producers are broken down by decomposers. and C) The remains of consumers are broken down by soil decomposers.
What is decomposers?Decomposers are organisms that break down dead or decaying organisms, and in doing so, they carry out the natural process of decomposition. Decomposers are a vital part of the food chain and the nutrient cycle. They are usually fungi and bacteria, but may also include other organisms, such as protists and certain animals, like worms and certain insects. Decomposers play an important role in the cycle of matter and energy in an ecosystem. They break down dead and decaying organisms, as well as feces, and in doing so, they release important nutrients back into the soil, which can then be used by other organisms. Decomposers are essential for the health of an ecosystem, as they help to maintain the balance of organisms and resources in an environment.
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c) Describe a method to determine the mass of dissolved solids in a 100 cm³ sample of
river water.
Page 1 of 2
(4) (Total 7 marks)
3
A gravimetric analysis is one way to find out how much-dissolved solids there are in a 100 cm3 sample of river water.
What is gravimetric analysis?Generally, One method to determine the mass of dissolved solids in a 100 cm³ sample of river water is through the use of a gravimetric analysis.
This involves first filtering the water sample to remove any suspended solids, then evaporating the remaining liquid to leave behind the dissolved solids.
The remaining solid material can then be weighed, and the mass of the dissolved solids in the original sample can be calculated.
Additionally, chemical analysis can be used to determine the concentration of dissolved solids by using volumetric analysis, by using ion-selective electrodes or by using spectrophotometry.
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What is an atom,alloy and element?
Place the steps in order from beginning to end to show how to determine the percent composition of a compound from its chemical formula.
Mass percentage is a term that represents the concentration, basically mass by mass percentage. It tells about the percentage of a component in a whole component. Therefore, in the below given ways we can find the percent composition.
What is percentage by mass?Mass percentage represents the the percentage of each element that is making a particular compound. Mass percentage does not have any unit as numerator and denominator contains the same unit.
Mathematically,
Percentage of mass = (component’s mass ÷ total mass) x 100%
Therefore, in the above given ways we can find the percent composition.
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The enthalpy of FeBr3 (s) is -269 kj/mol and the enthalpy of the reaction 2Fe(s) +3Br2(g) ->2FeBr3 (s) is -631 kj/mol. Calculate the enthalpy of evaporation of Br2 (l) which is liquid at 25C.
The reaction 2Fe(s) +3Br2(g) ->2FeBr3 (s) has an enthalpy of -631 kj/mol and has an enthalpy of -269 kj/mol. the enthalpy of evaporation of Br2 (l) which is liquid at 25C is 142.7KJ/mol
The enthalpy of evaporation of a substance is the heat absorbed when one mole of the substance is converted from a liquid at its boiling point to a gas at the same pressure. To calculate the enthalpy of evaporation of Br2, we need to use the enthalpy of formation of FeBr3 and the balanced equation for the reaction.
The enthalpy of formation of a substance is the heat absorbed or released when one mole of the substance is formed from its elements at standard conditions.
ΔHf(FeBr3) = -269 kJ/mol
ΔHrxn = -631 kJ/mol2Fe(s) + 3Br2(g) -> 2FeBr3(s)
ΔHrxn = 2(ΔHf(Fe(s)) + 3(ΔHf(Br2(l)) - ΔHf(FeBr3(s)) -631 = 2(0) + 3(ΔHf(Br2(l)) -(-269)
3(ΔHf(Br2(l)) = -631 + 2(0) + 269
ΔHf(Br2(l)) = -631 + 2(0) + 269 / 3
ΔHf(Br2(l)) = -142.7 kJ/mol
The enthalpy of evaporation of Br2 is -142.7 kJ/mol
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Click Pause ( ). Elements can be classified as metals and nonmetals. Metals do not hold on to their valence electrons very tightly, while nonmetals hold their electrons tightly. Electron affinity is a measure of how tightly the valence electrons are held.
A. Try pulling an electron away from each atom. Based on this experiment, which atom is a metal?
Sodium Which is a nonmetal? Chlorine
B. Try moving an electron from the metal to the nonmetal. What happens?
Sodium lets go of its one electron.
A. The alkali metal family of the periodic table includes sodium, a soft, silvery metal. Additionally, it reacts quickly.
B. Ionic bonds between sodium and chlorine form. Each one takes electrons. An electron can accept sodium.
Why does sodium's electron come to chlorine?The other atom's electrons are drawn to the protons of the other two atoms. Chlorine has a stronger attraction for electrons than sodium, as evidenced by the thicker arrow. The electron from the sodium atom's outer energy level is transferred to the chlorine atom's outer energy level during the interactions between the atoms.
To achieve its octet configuration and produce a negatively charged anion, this chlorine atom accepts one electron.
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PLEASE ANSWER ASAP- ANSWER ANY OF THE THREE OR ALL
1. For the following reaction, if 17. 8 g of Na2S, is reacted with excess AgNO3 in the laboratory, and 31 g of NaNO3 is produced, what is the percentage yield of NaNO3? Round your answer to the nearest whole percent.
Na2S + 2 AgNO3 → Ag2S + 2 NaNO3
2. For the following reaction, if 19. 7 g of H2, is reacted with excess CO in the laboratory, and 144. 5 g of CH3OH is produced, what is the percentage yield of CH3OH? Round your answer to the nearest whole percent.
CO + 2 H2 → CH3OH
3. For the following reaction, if 9. 7 g of AgNO3, is reacted with excess BaCl2, what is the theoretical yield of Ba(NO3)2 for this reaction? Round your answer to the nearest gram.
BaCl2 + 2 AgNO3 → 2 AgCl + Ba(NO3)2
The answer is 39.1 grammes if 9.7 g of AgNO3 reacts with extra BaCl2 in this process.
What is a reaction in science?In a chemical reaction, one or more substances—also known as reactants—are changed into one or more additional substances—also known as products. Chemical elements or chemical compounds make up substances. A response is a movement, propensity, or action that is taken in the opposite direction from what is intended. Reactions are made on the spur of the moment, without much thought or consideration of the potential outcome. Response: Saying something in response to another person's action or comment.
What are reactions examples?In daily life, there are several examples of chemical processes, such as photosynthesis, rust, baking, digesting, combustion, chemicals batteries, fermentation, and cleaning with soap and water. Not only in the chemistry lab, but all over the place, there are chemical reactions going on.
We have:
Na2S weight: 17.8 grammes
NaNO3 was actually created in 31 grammes.
The theoretical yield of NaNO3 that would result from 17.8 grammes of Na2S must now be determined.
We may calculate the number of moles using the molar mass of Na2S, which is 78.04g/mol:
78.04 grams = 1 mol
17.8 grams = x moles
78.04x = 17.8
x = 17.8/78.04
x = 0.23 moles of Na2S in 17.8 grams
Since the molar ratio of Na2S to NaNO3 is 1:2, we will make twice as much NaNO3 as Na2S.
0.23 * 2 = 0.46 moles of NaNO3 will be produced
We may determine the mass using the molar mass of NaNO3, 85g/mol:
85 grams = 1 mol
x grams = 0.46 moles
x = 0.46 * 85
x = 39.1 grams
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the radioactive isotope 32p decays by first-order kinetics and has a half-life of 14.3 days. how long does it take for 95.0% of a sample of 32p to decay?
Since 32p has first-order kinetics and a half-life of 14.3 days, it will take 62 days for 95.0% of a sample to degrade. The half-life of a chemical reaction is the time interval during which the concentration.
Of a particular reactant reaches 50% of its initial concentration (i.e. the time taken for the reactant concentration to reach half of chemical reaction and its initial value). The sign "t1/2" is used to denote it and is frequently expressed in seconds. Isotopes are two or more atom types that share the same atomic number (number of protons in their nuclei) and position in the periodic table. 0.693/14.3 = 2.303/t *(log(100/5))
t = 61.82 days
t = 62days
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You have samples of 3 different dandelion poisons. They cost $10 a gallon, $20 a gallon and $30 a gallon respectively. You would like to determine which one is the most effective. State your hypothesis, design an experiment, and state a result that would support your hypothesis quiz
The toxin that costs $30 per gallon is the most potent. We can draw the conclusion that the dandelion poison that costs $30 per gallon is the most potent.
What poison has the highest potency?Toxin from botulinum. Although scientists have different opinions on the relative toxicity of various compounds, most appear to concur that the anaerobic bacteria-produced botulinum toxin is the most toxic substance ever discovered. At most 1 nanogram per kilogram of its LD50 can kill a human.
What three sorts of poison are there?In terms of poisoning, chemicals can be broken down into three major categories: biological poisons, or substances derived from plants and animals, pharmaceuticals, and health care goods. The following discussion covers these three categories as well as a fourth one called radiation.
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A mixture contains only NaCl and Fe(NO3)3. A 0.471 g sample of the mixture is dissolved in water and an excess of NaOH is added, producing a precipitate of Fe(OH)3. The precipitate is filtered, dried, and weighed. Its mass is 0.137 g. Calculate the following.
The process's chemical reaction is
From the foregoing reaction, it can be deduced that 0.001 mol of Fe(OH)3 is produced for every 1 mol of Fe(NO3)3
Therefore, 0.001 mol of Fe(NO3)3 may be converted into 0.001 mol of Fe(OH)3 Fe(NO3)3 mass in the sample is
Consequently, the sample's Fe(NO3)3 mass is 0.242 g.
calculating the mass percentage of in the sample
The sample's mass percent of Fe(NO3)3 is
Consequently the samples mass percent of Fe(NO3)3 is 53.07%
Producing something is the act of creating something out of components or raw resources To put it another way production employs inputs to produce an output that is fit for consumption a thing or product that has value for a consumer or end user. Okay, so we all know that production is the act of manufacturing goods from raw materials, but it also has economic worth since it results in a product that is valuable and will satiate people's desires and requirements. A company that creates items is referred to as a producer in economics These businesses use the inputs—both material and immaterialthat are available to them to create commodities that consumers will wish to purchase
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given that oxygen has an atomic number of 8, what is your best estimate for the atomic mass of the oxygen atom? (hint: your answer should contain no decimals)
In this case Oxygen has a Weighted Average Atomic Mass of 15.999 AMU.is the best estimate for the atomic mass of the oxygen atom .
What is called oxygen?Oxygen is a chemical element a substance that contains only one type of atom. Its official chemical symbol is O, and its atomic number is 8, which means that an oxygen atom has eight protons in its nucleus. Oxygen is a gas at room temperature and has no colour, smell or taste.
Is oxygen good for health?Oxygen is a gas that your body needs to work properly. Your lungs absorb oxygen from the air you breathe. The oxygen enters your blood from your lungs and travels to your organs and body tissues.
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Are the bonds in each of the following substances ionic, nonpolar covalent, or polar covalent?
(a) KCl
ionic
nonpolar covalent
polar covalent
(b) P4
ionic
nonpolar covalent
polar covalent
(c) BF3
ionic
nonpolar covalent
polar covalent
(d) SO2
ionic
nonpolar covalent
polar covalent
(e) Br2
ionic
nonpolar covalent
polar covalent
(f) NO2
ionic
nonpolar covalent
polar covalent
Arrange the substances with polar covalent bonds in order of increasing bond polarity. (Use the appropriate <, =, or > symbol to separate substances in the list.)
KCl has ionic bond, P4 has nonpolar covalent bond, BF3 has polar covalent bond SO2 has polar covalent bond, Br2 has nonpolar covalent, NO2 has polar covalent bond.
An ionic bond is what?Ionic bonds, also known as electrovalent bonds, are a type of linkage created in a chemical molecule by the electrostatic attraction of ions with opposing charges. Whenever the valence (outer portion) electron of one atom are permanently transferred to another atom, a bond of this kind is created.
What distinguishes an ionic link from a covalent bond?Ionic bonds are produced among atoms of metals & non-metals in which the metal loses the electron to complete the octet and such non-metal acquires the electron to complete the octet. Covalent bond, when two atoms share electrons to complete their octets.
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if your water heater can supply 40 kbtu/h (thats kilo-btu/h), how long will it take to heat this water?
If a water heater can supply 40 KBTU/h then it will take 35.64 second to heat the water. This is calculated using the specific heat of water and the power concept.
The electrical energy is used totally depends on the total power used by all the electrical devices and the total time they are used. One kilowatt hour is equal to 1000 watts of power used for one hour of time.
time taken= energy required/ power delivered
System is used to define the measurement of a physical quantity. It is termed as the unit. Different types of unit measurement systems used are the SI unit system, MKS unit system, Imperial unit system, British unit system, etc.
1 BTU = 1055.6 J
Specific heat of water Cw. = 4186 J/Kg.
Time taken = energy required / power
= 100 . Cw. / 1055.6 * 40*
= 100 * 4186 / 1055.6 * 40 .
= 9.9 * hours
= 35.64 sec
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predict whether the following reactions are possible. Explain
your answers.
a. Ni(s) + MgSO4(aq) →→→→ NiSO4(aq) + Mg(s)
b. 3Mg(s) + Al₂(SO4)3(aq) →→→→ 3MgSO4(aq) + 2Al(s)
c. Pb(s) + 2H₂O(1)→→→→ Pb(OH)₂(aq) + H₂(g)
Help please!!!!
Answer:
A - not possible, B - possible, C- possible
Explanation:
You need to consider the reactivity series table. Check the attachment below.
A. If you see in the table, nickel is way below magnesium, meaning less reactive, and hence will not be able to snatch SO4 away from magnesium because it is not reactive enough so A is wrong.
B. Magnesium is more reactive than aluminium as mag appears right above alum, so yes possible.
C. Pb is lead which is more reactive than hydrogen so C is also possible.
Which is the simplest form of a crystalline solid?
lonic compounds
Non-Metals
Halogens
Metals
The most basic type of solid crystalline lonic compounds. Ions form the bulk of an ionic composition.
The correct statememnt is A.
Is water ionic or covalent?Ionic in nature, the covalent connection between the two hydrogen atoms in a water molecule is created when they deposit their positive charges on opposing sides of the oxygen atom, which has a negative charge.
What makes ionic bonding so durable?Ionic radius affects how strong an ionic bond is. The ionic lattice can accommodate smaller ions by allowing for closer packing. The electrostatic forces between oppositely charged ions become greater the closer they are to one another, and this increases the strength of the ionic bond.
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Give the full electron configuration for nitrogen. electron configuration: || 1s2s2p
1s can only accommodate two electrons. For N, the next two electrons enter the 2s orbital. The 2p orbital will house the final three electrons. A 1s22s22p3 electron configuration will therefore be present in the N.
How do you determine the configuration of an electron?The shell number (n) is the first symbol used to represent an electron configuration, followed by the kind of orbital and the superscript number of electrons in the orbital. Consider this: The periodic table shows that oxygen has eight electrons.
What three principles govern electron configuration?In other words, we abide by the Aufbau Principle, Electron - electron Concept, and Hund's Rule.
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Fill in the blank with the correct term. The part of one type of amino acid that makes it different from another type is the .______
The part of one type of amino acid that makes it different from another type is the side chain (or R group).
A side chain is a group of atoms that are attached to the alpha carbon atom of the amino acid and is composed of either a hydrogen atom, an alkyl group (a carbon atom with several hydrogen atoms attached), an aryl group (a carbon atom with several hydrogen atoms and a benzene ring attached), an acidic group (a carboxyl group or a sulfhydryl group), or a basic group (an amine group, a guanidinium group, or an imidazole group).
Each amino acid has a unique side chain, which is what gives it its unique chemical and physical properties and distinguishes it from other amino acids. The side chain is also what determines the amino acid's behavior in different environments, such as its solubility, reactivity, and charge.
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The part of amino acids that makes them different from one another is R- Group.
Amino acids are organic compounds. Its molecules combine to form proteins and proteins are called the building blocks of life. Every amino acid has a hydrogen atom present in them along with a carboxyl group, an alpha-amino group, and also the R-group.
R -Group makes the side chain. The side chain present in each Amino acid is the only unique feature that differentiates them. The R groups have a variety of sizes, shapes, charges, and reactivities. Thus, allowing them to be grouped according to the chemical properties of their side chains.
Therefore, the only main factor that makes every amino acid different is the presence of the R-group.
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When heated strongly, solid calcium carbonate decomposes to produce solid calcium oxide and carbon dioxide gas, as represented by the equation above. A sample of CaCO3 is placed in a rigid 35L reaction vessel from which all the air has been evacuated. The vessel is heated to 437°C at which time the pressure of CO2 in the vessel is constant at 1.00atm. Calculate the number of grams of CO2 gas that are present after the reaction completes.
The mass of the carbon dioxide gas is 26.4 g.
What is the mass of the carbon dioxide?We know that the mass of the carbon dioxide can be gotten from the number of moles of the compound that we have in the compound and we can be able to get it from the ideal gas equation.
Temperature = 437°C + 273
Volume = 35L
Pressure = 1.00atm
Number of moles = ?
Given that;
PV = nRT
n = PV/RT
n = 1.00atm * 35L/0.082 atm LK-1mol-1 * 710
n = 35/58.22
n = 0.60 moles
Mass = Number of moles * Molar mass
= 0.60 moles * 44 g/mol
=26.4 g
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