2NO(g) + Br2 (g) The equilibrium concentration of NOBr(g) was 0.127 when she added 0.164 moles of NOBr(g) to a 1.00 liter container. When she added 0.146 moles of and 0.111 moles of into a 1.00 liter container, a student conducted the reaction in the lab at 276 k.
What is equilibrium concentration?
The equilibrium concentration of I2(g) was found to be 3.79 x 10-2 M when she added 0.382 moles of HI(g) to a 1.00 liter container. the equilibrium constant if 25mL of H2 and 20mL of I2 are initially present in a container and 30mL of HI is generated at equilibrium Medium. A student carried out the subsequent reaction in a lab setting at 656 K, N2(g) + 3H2 + 2NH3(g) (g) she filled a 1.00 liter with 6.8710-2 moles of NH3(g).
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Which is a reasonable Lewis structure for the BN ion? 2- 2 - 2- 2- [B~N:| [B==N:] [B==N:] #:B-=N:| D
[:B-=N:]2- is the correct lewis structure for BN ion.
How to draw Lewis structure?The diagrams known as Lewis structures often referred to as Lewis dot formulas, Lewis dot structures, electron dot structures, or Lewis electron dot structures, depict the interactions between the atoms in a molecule as well as any lone pairs of electrons that may be present.
Find the total number of valence electrons as the first step.
Determine how many electrons are required to make the atoms "happy" in step two.
Choose a Central Atom in Step 4
Draw a skeletal structure in Step 5
Placing electrons around external atoms is step six.
Step 7_ Distribute the remaining electrons everywhere around the primary atom.
[:B-=N:]2- is correct lewis structure for BN ion
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transcribed image text: (27pts) part ii. galvanization mass of iron nail before: 0.620 g mass of galvanized iron nail: 0.610 9 (1 pts) mass of zinc produced (9) mass of zinc electrode before: 5.720 9 mass of zinc electrode after: 5.710 g (1 pts) mass of zinc consumed (9) length of time ran: 5.00 min 1. calculate the number of moles of electrons that passed through the cell during the electrolysis based off the amount of zinc produced on the iron nail. (4pts) moles of electrons (mol of e) (1pts) for full credit, upload all of your work for question 1 here. browse your files to upload or drag and drop max attachments: 5 max size: 20.00mb each 2. calculate the current (amps) that passed through the cell during the electrolysis. (8pts) current (amps)
The mass of Zn produced on the iron nail is similar/ equal to the mass of Zn lost from the Zn electrode. Hence no loss of mass.
Elaborate the above statement with calculation.Mass of Zn produced in iron nail= 0.630g -0. 610g = 0.01g
Mass of Zn consumed = 5.720 to 5.710 g = 0.01g
Given length of time run= 5 min = 5× 60 = 300 second
Moles of Zn passed = 0.001g = 0.00015 mol
1 mol contain = 6.022×10^23 atoms
Total electron contain in 0.00015 mol of Zn atoms
= 0.00015 × 30 ×6.022× 10^23
= 0.00461 × 6.022 × 10^23
Therefore, number of moles of electron transferees = 0.00461×6.022×10^23 / 6.022×10 ^23
= 0.00461 mol
From the Faraday first law of electrolysis
I = mF / Et
= 0.01 × 96500/32.7×200
= 0.098 mps
The mass of Zn produced on the iron nail is similar/ equal to the mass of Zn lost from the Zn electrode. Hence no loss of mass.
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3. look at the periodic table listing ionic radii trends. why are the radii changing as you move down the table within one column? why are the radii changing as you move across the table from left to right within one row?
The ionic radius grows in the Periodic Table as we proceed down a column or group. Moving through a row or period, the ionic radius decreases from left to right.
Because each row adds a new electron shell, ionic radii grow as we proceed down the column. Additional layers of electrons are being added as you progress down a group in the periodic table, which naturally causes the ionic radius to rise as you do so. Moving through a row or period, the ionic radius decreases from left to right. The outer valence shell doesn't change but there are extra protons added, which causes the positively charged nucleus to attract electrons more tightly. However, the ionic radius rises for nonmetallic elements since there are
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Write structural formulas for the products of 1,2 and 1,4 addition of hydrogen chloride to 2,4-hexadiene. My book solution has this as the answer, but I cant understand how they got the answers? Can someone explain?
The structural formulas for the products of 1,2 and 1,4 addition of hydrogen chloride to 2,4-hexadiene are attached as a picture.
For the reaction that was shown above the H-Cl molecule is added to the first double bond during the 1,2-addition reaction, while the second double bond does not participate in the reaction itself.
However, in the 1,4-addition reaction, the first step is identical, but in the second step, the 2nd double bond has the resonance to stabilize the carbocation. As a result, the location of the double bond shifts, and Cl- is added to the fourth carbon.
The complete mechanism is attached.
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well, the astronaut finally wakes up because he hears two distinct alarms. one for high co2 and another for low pressure, but the suit has way too much oxygen. as he stumbles to the hab, he is facing both high co2 and high o2, but a lowered atmospheric pressure. if the atmospheric pressure inside the suit is now 0.5 atm (equivalent to an altitude on earth of 5500 m above sea level), then what low pressure symptoms could he be experiencing? this is separate from just the co2 and o2 levels.
The low atmospheric pressure symptoms could he be experiencing the headache, nausea, dizziness, loss of coordination.
The force exerted the surface by the air lies above the surface due to gravity is called as the atmospheric pressure. The air around you has some of the weight and the pressure against it is called as the atmospheric pressure. as he stumbles to the hab, he is facing both high CO₂ and high O₂, but a lowered atmospheric pressure. if the atmospheric pressure inside the suit is now 0.5 atm (equivalent to an altitude on earth of 5500 m above sea level), then low pressure symptoms could he be experiencing are :
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Why is ethanol miscible in water?
Ethanol can dissolve in water because it is polar and can form hydrogen bond interactions with water.
Ethanol is often referred to as ethyl alcohol which has the chemical formula C2H5OH or CH3CH2OH which has a boiling point of 78.4°C. Ethanol is a chemical substance that is in the form of a clear liquid, has no color, is volatile and is very sensitive, so it is flammable.
Ethanol is generally used as a solvent in other chemicals such as drugs and other chemical compounds. This chemical dissolves easily in water and other organic solvents because it is polar and can form hydrogen bond interactions with water. The polarity of ethanol is due to the –OH group which is polar.
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g a reaction which is exothermic and has an overall increase in entropy is a) spontaneous only at high t b) spontaneous only at low t c) always spontaneous d) spontaneous in the reverse direction.
A reaction which is exothermic and has an overall increase in entropy is
A) spontaneous only at high T
B) spontaneous only at low T
C) always spontaneous
D) spontaneous in the reverse direction.
The correct option is C) i.e., always spontaneous
Spontaneity is determined by the free energy. When ΔGΔG is negative, it is spontaneous.
ΔG=ΔH−TΔSΔG=ΔH−TΔS
The problem indicates that the ΔSΔS is positive. If the reaction is exothermic, this means that the ΔHΔH is negative.
ΔGΔG is going to be negative no matter the temperature.
A spontaneous process is one that occurs on its own, without any energy input from the outside. For example, a ball will roll down an incline; water will flow downhill; ice will melt into water; radioisotopes will decay, and the iron will rust.
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Which electrons in this diagram contribute to the stability of the ion?
a. One electron in the sigma 1s MO and another one in the sigma* 1s MO.
b. The two electrons in the sigma 1s MO.
c. All electrons.
d. The electron in the sigma* 1s MO.
Energy-level diagram for theHe2+ ion:
One example of a heteronuclear diatomic molecule with both atoms in the second row is carbon monoxide. The 2s and 2p orbitals serve as the valence molecular orbitals in both atoms.
What exactly is the co2 molecular orbital diagram?
An O—O ligand fragment and a C atom serve as the foundation of the carbon dioxide MO diagram. The O—O fragment and carbon both have 2S and 2Px, y, z orbitals, which are involved in the creation of molecular orbitals.
What exactly is the O2 molecular orbital diagram?
Because of this, O2's electronic configuration is as follows: O2:KK(σ2s) 2(σ2s∙) 2(π2px)2=(π2py)2(π2px)1=(π2py∙) 1. The oxygen molecule's molecular orbital energy level diagram is shown as follows: Bonding sequence 2NbNa=284=2. Consequently, the oxygen molecule has two bonds.
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Dilute a solution that has an initial concentration of 0.03% to 0.0006%.
The solvent that must be added to dissolve a 0.03% solution to a 0.0006% solution is 49 times its original volume.
Dilution is a solution to which solvent is added. A common solvent is a water. Equation expressing dilution
V₁ M₁ = V₂ M₂
V₁ = the initial volume of solution before dilutionV₂ = the volume of solution after dilutionM₁ = the concentration of the solution before dilution = 0.03%M₂ = the concentration of the solution after dilution = 0.0006%V₁ × 0.03% = V₂ × 0.0006%
V₂ : V₁ = 0.03% ÷ 0.0006%
V₂ : V₁ = 50
V₂ = 50 V₁
Added solvent
V₂ - V₁ = 50V₁ - V₁ = 49V₁
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waghorne, w.e.; rous, a.j. determination of the relative atomic masses of metals by liberation of molecular hydrogen. j. chem. ed. 2009, 86, 350-351.
By using hydrochloric acid to react with calcium, magnesium, and aluminum, and then measuring the amount of hydrogen gas that is released, determine the atomic masses of these three elements.
How is hydrogen gas volume measured?Given that one mole of dihydrogen (H2) weighs 2,0159 g/mo and that the experimental density of hydrogen is 0,0899 g/L at 0 °C and 0,0837 g/L at 20 °C, it is possible to compute the precise molar volume of hydrogen.
How do you figure out how much hydrogen gas STP produces?One mole of gas has a volume of 22.4 dm3 at standard pressure and temperature, or stp (0 °C, 101,500 N m-2). The students can anticipate a response of roughly 24 dm3 at ambient temperature and pressure, rtp. The volume at stp can be calculated using the equation P1V1/T1 = P2V2/T2 by more capable students.
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which of the following does not affect the solubility of a gas in water a. salinity of the water b. temperature of the water c. atmospheric pressure d. concentrations of other gasses in solution
The option which does not affect the solubility of the gas in water is d) concentrations of other gasses in solution.
The solubility of the gas is depends on the interaction in between the molecules of the water and the molecules of the gas. The factors which will affect the solubility of the gas in the water is given as :
salinity of the water temperature of the waterpressureThe temperature will affect the solubility of the gas and the solubility of the solids. the pressure will affect the solubility of the gas but does not affect the solubility of the solid.
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What is an element?
Please help my little sis needs help and I forgot what it is
a substance that can’t be broken down into another substance.
identify the following compound. c5h10o: nmr: δ 9.8 (1h, s), δ 1.1 (9h, s)
The problem is based on NMR spectroscopy, so the structure of the compound is given below:
What is NMR spectroscopy?NMR (nuclear magnetic resonance) spectroscopy is a well-known technique in organic chemistry which is used to determine the structure of the organic compound. It works on the principle in the presence of an external magnetic field some nuclei which have spin are transferred from lower energy level to higher energy.
The double bond equivalence/ degree of unsaturation gives an idea about the number of double bonds or rings present. It can be calculated as:
DBE = C - H/2 - N/2 + 1
Here, C, H and N is number of carbon, hydrogen and nitrogen atom respectively. Determination of the DBE, gives us a preliminary idea about the structure.
By substituting the value of C, H and N as 5,10 and 0 in equation (1), we calculate the Double bond equivalence as:
DBE = 5 - 10/2 - 0/2 +1
DBE = 1
The peak obtained at δ1.1 for 9H indicates the presence of 9 equivalent hydrogen atoms which are saturated. The peak obtained for a single H at
δ9.8 indicates the presence of a C=O bond, and usually is associated with an aldehyde.
The DBE is found to be 1 indicating the presence of a double bond or the presence of a ring.
By analyzing, the given values of the shift, the structure is found to be:
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Choose the combination of factors that would lead to the greatest oxygen unloading from hemoglobin. Low pH, high temperature, high Pcoz, high 2,3-BPG Low pH, high temperature, low Pcos, high 2,3-BPG High pH, low temperature, low Pcoz, low 2,3-BPG High pH, high temperature, high Pcoz, low 2,3-BPG Submit Request Answer rovide Feedback
Temperature, pH, PCO2, and 2,3 diphosphoglycerate are some of the variables that affect how oxygen binds to hemoglobin.
The oxygen dissociation curve moves to the right and Hb's affinity for O2 decreases as its temperature rises. The oxygen Hb dissociation curve changes to the right as the partial pressure of carbon dioxide rises, increasing the P50 value. As a result of greater Hb binding to carbon dioxide, Hb has a lower affinity for oxygen.
High pO2: The more oxygen there is in the air, the more effectively haemoglobin binds to oxygen.Low pCO2: Oxyhemoglobin production is reduced by a lot of carbon dioxide. Compared to oxygen, carbon dioxide has a stronger affinity for hemoglobin.Less H+: Hemoglobin is more likely to dissociate when the pH is lower or the hydrogen ion concentration is higher.Lower temperature: Hemoglobin and oxygen are more likely to bind at a normal temperature. The oxygen separation from haemoglobin is caused by the high temperature.To learn more about oxygen click here https://brainly.com/question/13370320
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How many phases does every solution have? Explain.
A solution can have only one phase.
When we mix to compound together like alcohol in water then we can observe that they are fully miscible in each other.
We have to observe hair that both the solute and the solvent has the same phase so the resulting mixture will also have only one phase.
When the solute and the solvent are immiscible they forms a two-phade system. Because they former interface between the water and oil surfaces.
But normally it is observed that a solution has only one phase which same as the phase of the solvent and the Solute.
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Question 3 (1 point)
Michelle is trying to find the average atomic mass of a sample of an unknown
element. She finds that her sample contains 28.49% of an isotope with a mass of
56.2925, while the rest of the sample is an isotope with a mass of 52.4566. What is
the average atomic mass of her sample? Please round your answer to 0.01 amu.
Your Answer:
Answer
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units
O4
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The average atomic mass of Michelle's sample is equal to 53.549 amu.
What is the natural abundance of elements?Natural abundance can be defined as the abundance of natural isotopes of a chemical element found on a planet. The relative atomic mass can be defined as the atomic weight of the element in the periodic table.
The natural abundance of an isotope is affected by the probability of its creation and by the production of an isotope as a daughter of the natural radioactive isotope.
The mass of one isotope = 56.2925 amu, relative abundance =28.49%
The relative abundance of the other isotope = 100 - 28.49 = 71.51 %
The mass of the other isotope = 52.4566 amu
Average atomic mass = 56.2925 × 0.2849 + 52.4566 × 0.7151
Average atomic mass = 16.0377 + 37.511
Average atomic mass = 53.549 amu
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QUESTION 27 The major chemical structures of hormones include
O polysaccharides, esters, and steroids. 2 points only molecules containing amine groups.
O steroids, amino acid derivatives, and esters.
O steroids, polypeptides, and anino acid derivatives. only steroids.
Answer will be fourth option : steroids, polypeptides and amino acid derivatives.
What are steroids?
Steroids, also called corticosteroids, are anti-inflammatory drugs used to treat a variety of conditions.
These are different from anabolic steroids, which are used illegally to increase muscle mass. Unpleasant side effects such as increased appetite, mood swings, and sleep disturbances may occur. This is most common with steroid tablets.
Side effects usually go away when treatment is stopped, but do not stop taking the medicine without talking to your doctor. Stopping prescribed medications can cause other unpleasant side effects (withdrawal symptoms).
Therefore, answer will be fourth option : steroids, polypeptides and amino acid derivatives.
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What is the correct chemical formula for hexachlorostannate (II) ion?
The correct chemical formula for the hexachlorostannate (II) ion is SnCl6^2-. This ion contains one tin atom bonded to six chlorine atoms. The charge on the ion is indicated by the superscript "2-" at the end of the formula, which indicates that the ion has a net charge of -2.
Ethylene glycol, HOCH2CH2OH, may look nonpolar when drawn, but an internal hydrogen bond results in an electric dipole moment, Explain.
An electric dipole moment is produced by an internal hydrogen bond. Because the bond polarity of two carbon-oxygen bonds cancel each other out, ethylene glycol seems to be non-polar. As a result, ethylene glycol has no dipole moment.
Are there dipole-dipole forces present in ethylene glycol?Therefore, the intermolecular forces for ethylene glycol include dispersion, dipole-dipole, and hydrogen bonding.
What distinguishes a hydrogen bond from a dipole-dipole interaction?Dipole dipole interactions take place when partially negatively charged molecules engage with a nearby molecule with a positive charge, which is the main distinction between them and hydrogen bonds. In contrast, the strong dipole-dipole bonding that occurs between O and N is known as hydrogen bonding.
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recall that photosynthetic rates remain relatively constant in regions near the equator. imagine that tropical environments persist throughout earth's northern and southern hemispheres; that is, that earth's entire climate mirrors that near the equator. if keeling had collected his atmospheric co2 data on such an earth, what would you expect the keeling curve to look like? please choose the correct answer from the following choices, and then select the submit answer button. answer choices a straight line sloping upward, indicating that atmospheric co2 levels would not seasonally oscillate, but would increase over time a straight line sloping downward, indicating that atmospheric co2 levels would not seasonally oscillate, but would decrease over time a straight line without a slope, indicating that atmospheric co2 levels would have remained constant over time a sinusoidal curve sloping upward, indicating that atmospheric co2 levels would fluctuate seasonally, but would increase over time a sinusoidal curve sloping downward, indicating that atmospheric co2 levels would fluctuate seasonally, but would decrease over time
A Straight line sloping upward (atmospheric CO2 levels would not seasonally oscillate, but would have increased over time).
A straight line up the graph means it has a positive slope, meaning that even though atmospheric carbon dioxide levels would not oscillate through the seasons, in this case in tropical environments in the northern and southern hemisphere Earth, that is, the climate close to the equator, the positive slope indicates that carbon dioxide levels would increase over time.
Photosynthesis is the process through which green plants and certain other organisms make their food using carbon dioxide and water in the he presence of Sunlight.
During photosynthesis, energy conversion from light energy into chemical energy takes place.
Photosynthesis is one of the major processes that helps to eliminate and reduce the quantity of carbon dioxide in the atmosphere,it also serve to make oxygen present in the atmosphere.
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why this equation is an example of the Law of Conservation of Mass.
N2 + 3H2 -> 2NH3
Answer:
The equation you provided is an example of a chemical reaction in which nitrogen gas (N2) and hydrogen gas (H2) react to form ammonia (NH3). The Law of Conservation of Mass states that matter cannot be created or destroyed, only transformed from one form to another.
In this reaction, the total number of atoms on the reactant side (left side of the arrow) is equal to the total number of atoms on the product side (right side of the arrow). Specifically, there are 2 nitrogen atoms, 6 hydrogen atoms, and 2 ammonia molecules on the reactant side, and these atoms are rearranged to form 2 nitrogen atoms, 6 hydrogen atoms, and 2 ammonia molecules on the product side.
This demonstrates that the total mass of the reactants is equal to the total mass of the products, which is a key principle of the Law of Conservation of Mass. This law is a fundamental concept in chemistry that helps us understand how chemical reactions take place and how atoms are transformed from one form to another.
what is the formal charge on the oxygen atom in n2o (the atomic order is n–n–o)?
Therefore, in both the resonance structure, the fundamental value of nitrous oxide is zero.
Is oxygen the same as oxide?Therefore, it is abundantly evident from the definitions of atoms and ions that oxide is an atom and oxide is an ion with a charge = -2, which indicates that it has gained two additional electrons. We may alternatively say that an oxide is a chemical substance that has at least 1 oxygen atom.
Oxide – an acid?Oxides are divided into acidic, basic, amphoteric, and neutral categories based on their acid-base properties: An oxide is referred to as acidic if it reacts with water to form an acid. An oxide that creates a base from water is known as a basic oxide.
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which statement is true about 22.4 l each of hydrogen, ammonia, and uranium dioxide gas assuming that the temperature and pressure are the same for all the gases?responsesthe gases have the same number of molecules.the gases have the same number of molecules.hydrogen gas has the least number of molecules.hydrogen gas has the least number of molecules.oxygen gas has the most number of molecules.oxygen gas has the most number of molecules.uranium dioxide gas has the most number of molecules.
The statement is true about 22.4 l each of hydrogen, ammonia, and uranium dioxide gas assuming that the temperature and pressure are the same for all the gases is the gases have the same number of molecules
The ideal gas equation is given as :
P V = n R T
n = P V / R T
if for the 22.4 L each of the gas that is hydrogen , ammonia and the uranium dioxide gas are in the same temperature and the pressure then the number of moles of the each gas are equal.
Thus, the all the gases is the gases have the same number of molecules
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Answer: The gases have the same number of molecules.
Explanation:
Honey ask a scientific question: “How does the water temperature affect the amount of jaggery that dissolves?” She lists the important variables in her investigation. - temperature of water - the amount of jaggery that dissolves
- volume of water
- size of jaggery
- texture of jaggery
1). Choose the variable in the list above that she should change.
2). Choose the variable in the list above that she should measure.
Answer:
She should change the temperature of the water.She should measure the amount of jaggery that dissolves.Explanation:
It's important to note that all of the variables listed could potentially affect the amount of jaggery that dissolves in water. However, in order to investigate the effect of water temperature on the amount of jaggery that dissolves, she should hold all other variables constant (such as the volume of water, size of jaggery, and texture of jaggery) and only vary the temperature of the water.
- By doing this, she can isolate the effect of water temperature on the amount of jaggery that dissolves and draw conclusions about the relationship between these two variables.
Let me know if you have any further questions.
The beer-lambert law is A = Elc, where A is the absorbance, E is the molar extinction coefficient, l is the path lengh in cm and C is the concentration. The beer lambert law can be expressed in the form of y=mx + b, where A is y, and C is x. What is b and how is it used to calculate the final absorbance? b is the absorbance of another protein and is added from the absorbance of the other A values b is the absorbance of contaminations and is subtracted from the absorbance of the other A values b is the absorbance of the blank and is subtracted from the absorbance of the other A values b is the absorbance of the initial pure protein and is added to the absorbance of the other A values
In the expression of beer lamberts law y= mx + b, b is the path length which is directly proportional to the concentration.
The Beer lamberts law explains the properties of the material through which the light is traveling. It explains the use of the terms absorbance and molar absorptivity relating to UV-visible absorption spectrometry. For each wavelength of light passing through the spectrometer, the intensity of the light passing through the reference cell is measured. The intensity of the light passing through the sample cell is also measured for that wavelength is given the symbol, I. If I is less than Io, then the sample has absorbed some of the light.
A = Elc,
where, A is the absorbance.
E is the molar extinction coefficient.
l is the path length in cm.
C is the concentration.
The beer lambert law can be expressed in the form of
y=mx + b
where A is y, and C is x and b is a second factor is the path length. The longer the path length, the more molecules there are in the path of the beam of radiation, therefore the absorbance goes up. Therefore, the path length is directly proportional to the concentration.
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the reaction of nitrogen gas with oxygen gas forms nitrogen monoxide according to the following reaction. what is the energy change in kj when 0.575 mol of nitrogen monoxide (no) is produced?
When 0.575 mol of nitrogen monoxide (no) is generated, the energy change is 1.729215262 KJ.
What exactly are chemical reactions?Chemical reactions rely heavily on energy shifts. The interaction of particles frequently involves energy transfers as a result of bond breakage and creation. Exothermic reactions are those in which energy is released into the environment, whereas endothermic processes absorb heat energy.
N2 + O2 ——— > 2NO ——— H = +180.5 KJ
According to the preceding equation, when 2 mol of NO is generated, the energy change is 180.5 KJ.
=> 60.02 g NO produced, the energy change is 180.5 KJ. => 0.3830 g NO produced, the energy change
= (180.5/60.02)0.575 KJ
= 1.729215262 KJ.
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at the end of glycolysis, in what molecule(s) can one find the energy that was contained in the chemical bonds of glucose? select all that apply.
At the end of glycolysis, one can find the energy that was contained in the chemical bonds of glucose in ATP, NADH and pyruvate molecule.
The process of glycolysis takes place in the cytosol of a cell. It can be broken down into two phases viz. energy requiring phase and energy releasing phase.
Energy requiring phase: The starting molecule i.e glucose is at first rearranged and two phosphate groups are attatched to it, which comes from ATP. The phosphate groups form the sugar- fructose-1,6-biphosphate. This splits into three-carbon sugars
Energy releasing phase: The three carbon-sugars are converted into three-carbon molecules i.e two ATP molecules and one NADH molecule and pyruvate.
Thus, in ATP, NADH and pyruvate we can find the energy contained in chemical bonds of glucose.
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sugar is a covalent compound. how do molecules of a sugar sample behave when the sample dissolves in water? responses the solute molecules separate from each other by dispersion. the solute molecules separate from each other by dispersion. the solvent molecules separate from each other by dispersion. the solvent molecules separate from each other by dispersion. the solvent molecules separate from each other by ionization. the solvent molecules separate from each other by ionization. the solute molecules separate from each other by ionization.
Molecules of a sugar sample behave when the sample dissolves in water the solute molecules separate from each other by dispersion. Option B.
Sucrose is a polar molecule. Polar water molecules attract the negative and positive regions of polar sucrose molecules, causing sucrose to dissolve in water. Sugar is a covalent, slightly polar compound that can dissolve in water due to its polarity.
Every time you break down a covalent compound like sugar you see a physical change. The molecules move further apart in the solvent but do not change. Dissolving sugar in water is a physical change. This is because no new matter is formed. Also, the process is reversible. Water and sugar are separated by evaporation followed by condensation and crystallization.
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What mass of calcium hydroxide is formed when 10. 0 g of calcium oxide reacts with 10. 0 g of water?.
The mass of calcium hydroxide is formed when 10.0g of calcium oxide reacts with 10.0 g of water is 13.024g.
The equation can be written as, CaO + H2O → Ca(OH)2
We have to find the moles of each reactant. We can calculate this by the expression using molar mass and mass of the reactant. the molar mass of a chemical 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. Moles can be expressed as,
moles = mass / molar mass
moles of CaO= 10 g/56 g/mole
= 0.179 moles
moles of H2O = 10 g/18 g/mole
= 0.556 moles
when 10.0g of calcium oxide reacts with 10.0g of water we have to calculate mass of calcium hydroxide. we can calculate this by using the expression for molar mass M is the mass of a chemical compound divided by its amount of substance measured in moles. it is expressed as,
mass= moles x molar mass
= 0.176 moles x 74 g/mole
= 13.024 grams
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at 273 k, ice and liquid water are in equilibrium. what relation then must be true of the vapor pressures of pure ice and pure liquid water at 273 k?
Relation then must be true of the vapor pressures of pure ice and pure liquid water at 273 k are cooling impact of ice at 273 K is greater than that of water at the same temperature because ice absorbs more heat to overcome the latent heat of fusion.
How does latent heat work?The energy needed to induce a change in the material's physical state, which results in the production of the liquid, is known as latent heat of fusion. It must be applied to solid matter.
The cooling effect of ice at 273 K is due to the absence of latent heat and hidden heat, which are present in water and cause them to be less chilly than ice at the same temperature.
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