chemistry homework 26 – Custom Nursing Help

Need help with chemistry homework. All questions are listed below.
Homework Ch13
Q5 A solution is made by dissolving 27.6 g of nickel(II) chloride, NiCl2, in enough water to make exactly 500 mL of solution. Calculate the concentration (molarity) of NiCl2 in mol/L (M).
_______ M NiCl2
Q6 Calculate the mass, in grams, of K2Srequired to prepare exactly 250 mL of a 0.510-M solution of K2S. _____ g
Find one more question in the attachment.
Homework Q ch14
Question 1
Which of these statements about cohesive forces is/are correct?
I.In the absence of cohesive forces, most substances would be solids.II.Cohesive forces result in the formation of liquid droplets or spheres.III.A spherical shape minimizes the surface-area-to-volume ratio.
I only
II only
I and III
II and III
I and II
Question 2
Which of these statements about liquids is/are correct?
I.Increased molecular motion results in increased rate of evaporation.II.Liquids take the shape of their container.III.Liquids have relatively low compressibility compared to gases.
I only
II only
I and II
II and III
I, II, and III
Question 3
Which of the following statements about solids is/are correct?
I.Solids have lower kinetic energy than liquids.II.Molecules present in solids are in fixed positions.
III.The shape of a solid is independent of the container that holds it.
I only
II only
I and II
II and III
I, II, and III
Question 4
The point at which a liquid gets converted to a gas is known as the _____.
boiling point
melting point
sublimation point
deposition point
freezing point
Question 5
Which substance has the greatest dispersion force?
CH4
F2
He
Cl2
O2
Question 6
Which substance is likely to have the highest vapor pressure?
CH3CH2CH2CH3
CH3CH2CH2CH2CH3
CH3CH2CH2CH2CH2CH3
CH3CH2CH2CH2CH2CH2CH3
The vapor pressure is about the same for all the listed molecules.
Question 7
The dominant intermolecular attractive force(s) between CH3Cl molecules is/are _____.
dipole forces
dispersion forces
hydrogen bonding
London forces
volatile forces
Question 8
Which of these substances is polar?
CO2
SO2
Cl2
CH4
BF3
Question 9
Which of these substances is nonpolar?
H2O
SO2
HF
CCl4
CH3F
Question 10
In which of the following does hydrogen bonding occur?
Nonpolar molecules containing hydrogen
All molecules that contain hydrogen
Molecules that contain hydrogen and carbon
Molecules that contain hydrogen bonded to either nitrogen, oxygen, or fluorine
All of these
Question 11
Molarity is defined as the number of moles of _____ per liter of _____.
solvent; solution
solution; solvent
solute; solution
solution; solute
solvent; solute
Question 12
What is the unit of molarity?
Grams per mole
Grams per liter
Moles per liter
Molecules per liter
Molecules per mole
Question 13
What is the concentration in molarity of a solution made by dissolving 20.0 grams of KOH in 150.0 mL of H2O (molar mass of KOH = 56.1056 g/mol)?
0.133 M
0.421 M
2.37 M
4.35 M
7.5 M
Question 14
A 5% acetic acid solution contains _____ grams of acetic acid per _____ grams of solution.
5; 10
95; 100
100; 500
5; 500
50; 1000
Question 15
For solutions in water, a part per million is roughly equivalent to _____.
g/mL
mg/mL
g/L
mg/L
kg/mL
Question 16
Which of these is a benefit of water’s unique freezing properties?
Water freezes on the surface of lakes, allowing marine life underneathto survive during winter.
Water freezes at the bottom of the ocean, cooling volcanic eruptions.
Water freezes in the cracks within rocks, preventing erosion of mountains.
Water freezes in the cells of living bodies, protecting them from externalviruses.
Water freezes in living bodies, minimizing their dependence on external sources of water.
Question 17
What fraction of water on the planet is in readily usable forms such as streams and lakes?
98%
47%
2.6%
14%
0.014%
Question 18
Which of these elements is/are the primary component(s) in hard water?
I.MagnesiumII.IronIII.CalciumIV.Sodium
I only
III only
II and III
I and III
II and IV
Question 19
Which of these is a result of dumping human waste near or directly into ground or surface waters?
Hard water
Soft water
Biological contaminants
Radioactive contaminants
Inorganic contaminants
Question 20
Which of these water treatment systems removes organic contaminants?
Carbon filtering
Water softening
Reverse osmosis
Coagulation
Chlorination
Question 21
Water softeners are used to avoid the undesirable effects of hard water. These water softeners are charged with _____ ions.
sodium
calcium
potassium
chlorine
magnesium
Question 22
Which of these statements about boiling point is/are incorrect?
I.Boiling occurs when there is sufficient molecular energy to convert a liquid to a gas.II.The stronger the cohesive forces, the higher the boiling point.
III.Boiling results in the cleavage of chemical bonds.
I only
II only
III only
I and III
II and III
Question 23
Substance A contains stronger cohesive forces than substance B. Which of the following statements is true?
Substance A will have a higher boiling point and higher vapor pressure than substance B.
Substance A will have a lower boiling point and lower vapor pressure than substance B.
Substance A will have a lower boiling point and higher vapor pressure than substance B.
Substance A will have a higher boiling point and lower vapor pressure than substance B.
Substance A will have the same boiling point and vapor pressure as substance B.
Question 24
Which of these substances in its/their liquid form contain(s) hydrogen bonds?
I.HgII.H2OIII.C2H5OHIV.CH3CH3
I only
II, III, and IV
I and II
II and III
I, II, and III
Question 25
Which of these is not a unit for measuring the concentration of solutions?
M
m
ppm
atm
mg/L
 
Do you need a similar assignment done for you from scratch? We have qualified writers to help you. We assure you an A+ quality paper that is free from plagiarism. Order now for an Amazing Discount!Use Discount Code “Newclient” for a 15% Discount!NB: We do not resell papers. Upon ordering, we do an original paper exclusively for you.