Question 1

Which of the following statements concerning water is incorrect?

Accepted Answer

Water has a higher density in the solid state than in the liquid state at its melting temperature

Answer

Water covers approximately three quarters of the surface of the Earth

Answer

Water dissolves a wide range of both polar and ionic substances

Answer

Water has a higher latent heat of fusion than similar molecules like hydrogen sulfide

Question 2

The importance of water being transparent to visible light is that it …

Accepted Answer

allows photosynthesis to occur in aqueous systems.

Answer

decreases the density of the water.

Answer

keeps fish at 37°C

Answer

helps gases dissolve.

Question 3

The ratio of land to ocean at the surface of the Earth is …

Accepted Answer

1 : 3

Answer

1 : 5

Answer

1 : 2

Answer

1 : 4

Question 4

Which of the following procedures will usually increase the concentration of a saturated solution?

Accepted Answer

Increasing the temperature and adding more solute

Answer

Adding more solute and shaking the solution

Answer

Adding more water and cooling the solution

Answer

Increasing the temperature and shaking the solution

Question 5

The correct way to represent a solution of sodium chloride in water is …

Accepted Answer

NaCl (aq)

Answer

NaCl (g)

Answer

NaCl (s)

Answer

NaCl (l)

Question 6

The gas with the highest solubility in water is …

Accepted Answer

ammonia

Answer

hydrogen

Answer

carbon dioxide

Answer

oxygen

Question 7

Which of the following statements concerning water and living things is incorrect? Water is used …

Accepted Answer

as a reactant in the process of aerobic respiration.

Answer

to maintain structure in plants.

Answer

as a solvent

Answer

as a coolant to maintain body temperature in mammals.

Question 8

The high heat capacity of water means that it has …

Accepted Answer

an excellent temperature moderating ability.

Answer

no significant role in the atmosphere.

Answer

a low boiling point.

Answer

a poor capacity for storing heat.

Question 9

The shape of an $OCl_2$ will be …

Accepted Answer

V shaped.

Answer

tetrahedral.

Answer

linear.

Answer

pyramidal.

Question 10

An atom of element X forms three single covalent bonds with atoms of element Y. The molecule, $XY_3$, has no lone pairs in its structure. The bond angle $XY_X$ in this molecule is …

Accepted Answer

120°

Answer

180°

Answer

90°

Answer

109°

Question 11

For which of the following is the molecular shape incorrectly stated?

Accepted Answer

$SO_2$ – linear

Answer

$PH_3$ – pyramidal

Answer

$CH_4$ – tetrahedral

Answer

$H_2O$ – V-shaped

Question 12

The shape of $BF_3$ is …

Accepted Answer

trigonal planar.

Answer

pyramidal.

Answer

V-shaped.

Answer

linear.

Question 13

The molecule shown below will …

Accepted Answer

contain polar bonds and be polar.

Answer

be non-polar and contain no polar bonds.

Answer

form a three-dimensional network solid.

Answer

contain polar bonds but be non-polar.

Question 14

A dipole is formed when …

Accepted Answer

a covalent bond is formed between atoms of different electronegativity.

Answer

a non-metal and a metal combine to form a compound.

Answer

a molecule contains a hydrogen atom.

Answer

any covalent bond is formed.

Question 15

Of the four elements listed below, the one with the highest electronegativity is …

Accepted Answer

chlorine.

Answer

phosphorus.

Answer

sulfur.

Answer

selenium.

Question 16

Which of the following molecules is expected to be polar?

Accepted Answer

$PCl_3$

Answer

$CCl_4$

Answer

$P_4$

Answer

$BF_3$

Question 17

In which of the following are the elements arranged in order of increasing electronegativity?

Accepted Answer

Si, P, N, O

Answer

P, Si, N, O

Answer

O, N, P, S

Answer

P, N, Si, O

Question 18

$H_2S$ is a …

Accepted Answer

polar molecule with the same shape as water.

Answer

non-polar molecule with the same shape as $CO_2$.

Answer

non-polar molecule with the same shape as $OCl_2$.

Answer

polar molecule with the same shape as CH4.

Question 19

When fluorine forms a liquid, the weak bonds between the molecules are due to …

Accepted Answer

dispersion forces.

Answer

dipole-dipole bonds.

Answer

the attraction between the positive and negative ions.

Answer

the polarity of the molecule.

Question 20

A small sample of a molecular compound is heated in an ignition tube. The white crystals easily turn to a clear liquid. After further heating, the clear liquid turns black and a gas is evolved. During heating, the thermal energy …

Accepted Answer

overcame the forces between molecules, and then overcame the forces within the molecules.

Answer

caused decomposition followed by a change of state.

Answer

overcame the forces within the molecules, and then overcame the forces between molecules.

Answer

caused the ionic bonds to weaken, allowing the ions to move freely as a liquid.

Question 21

Neon turns from a liquid to a solid at −249°C. The forces present in solid neon are …

Accepted Answer

dispersion forces.

Answer

due to dipoles.

Answer

non existent as Group VIII compounds do not form bonds.

Answer

covalent bonds.

Question 22

Which of the following molecules is expected to exhibit hydrogen bonding?

Accepted Answer

HF

Answer

$CH_4$

Answer

HCl

Answer

$H_2S$

Question 23

Methane $(CH_4)$ boils at approximately 130°C below the boiling point of ammonia $(NH_3)$. The difference in these boiling points is best explained by …

Accepted Answer

the presence of hydrogen bonding in ammonia.

Answer

the stronger covalent bonds in ammonia.

Answer

the ionic bonds in ammonia.

Answer

the stronger dispersion forces in ammonia.

Question 24

The difference in melting point between HCl (−114°C) and HBr (−87°C) is due to …

Accepted Answer

stronger dispersion forces between HBr molecules.

Answer

stronger dipole-dipole bonding between HCl molecules.

Answer

the increased polarity of HBr.

Answer

hydrogen bonding between HBr molecules.

Question 25

The trend in melting points for the noble gas elements is …

Accepted Answer

they increase moving down the group.

Answer

they are unrelated to the atomic radius.

Answer

they stay constant for the whole group.

Answer

they decrease moving down the group.

Question 26

Which of the following occurs when a sample of water freezes to ice?

Accepted Answer

The mass of the sample is unchanged

Answer

The density of the sample increases

Answer

Energy is required

Answer

he ice formed will have a smaller volume than the water had

Question 27

Water is a …

Accepted Answer

polar, V-shaped molecule.

Answer

on-polar, linear molecule.

Answer

non-polar, V-shaped molecule.

Answer

polar, linear molecule.

Question 28

Compared to other small molecules, the melting point and boiling point of water is …

Accepted Answer

higher.

Answer

about the same.

Answer

much lower.

Answer

slightly lower.

Question 29

Ethanol is miscible in water because it is …

Accepted Answer

polar and can hydrogen bond to water.

Answer

non-polar and can bond via dispersion forces to water.

Answer

polar and can bond via ionic bonds to water.

Answer

non-polar and can bond via ion-dipole bonds to water.

Question 30

Which of the following statements is correct?

Accepted Answer

Solutions are homogeneous mixtures.

Answer

Polar solvents tend to dissolve non-polar solutes

Answer

Solutions only ever contain one solute.

Answer

Water is always the solvent.

Question 31

Which of the following does not take place when sugar dissolves?

Accepted Answer

The intermolecular bonds between sugar molecules stay intact

Answer

The intermolecular bonds between some water molecules are broken

Answer

The intermolecular bonds between sugar molecules are broken

Answer

Intermolecular bonds form between sugar molecules and water molecules

Question 32

Which equation best shows the process that occurs when sodium carbonate crystals are stirred in water

Accepted Answer

$Na_2CO_3$(s) --> 2Na+(aq) + $CO_3^{2-}$(aq)

Answer

$Na_2CO_3$(s) + $H_2O$ --> NaOH(aq)  +  $H_2CO_3$(aq)

Answer

$Na_2CO_3$(s)  --> Na+(aq)  +  $CO_3^-$(aq)

Answer

$Na_2CO_3$(s)  + $ H_2O$ --> $Na_2O$(aq)  +  $H_2CO_3$(aq)

Question 33

Pure hydrochloric acid does not conduct electricity. However, when hydrochloric acid is added to water, the solution conducts. This change in conductivity is explained in terms of …

Accepted Answer

ionisation.

Answer

vaporisation.

Answer

recrystallisation.

Answer

dissociation.

Question 34

Water leaking into a car petrol tank can cause the engine to not run properly. Which of the following is the best explanation for why this happens?

Accepted Answer

Petrol and water are immiscible

Answer

The petrol and water react to form a compound that does not burn

Answer

The polar octane molecules in petrol bond to the water molecules

Answer

The petrol molecules are ionised to produce a compound that will not dissolve in water

Question 35

The diagram below shows the dissolution of an ionic compound in water. The bond between the ion and the water molecule is of what type?

Accepted Answer

Ion-dipole

Answer

Ionic bond

Answer

Covalent bond

Answer

Hydrogen bond

Question 36

Copper(II) sulfate forms a blue solution. In this blue solution …

Accepted Answer

both the copper ions and the sulfate ions are surrounded by water molecules.

Answer

separate copper, sulfur and oxygen ions move amongst the water molecules.

Answer

the copper(II) sulfate exists as tiny, invisible crystals.

Answer

single molecules of copper(II) sulfate move amongst the water molecules.

Question 37

When solid potassium chloride (KCl) is added to a beaker of water, the conductivity of the beaker contents …

Accepted Answer

increases due to the dissociation of the KCl.

Answer

increases due to the ionisation of the KCl.

Answer

decreases due to a change in the temperature as the reaction between water and KCl proceeds.

Answer

decreases due to reaction between the water and KCl.

Question 38

When ethanol is added to water the …

Accepted Answer

ethanol dissolves because ethanol and water are both polar.

Answer

ethanol dissolves by dissociation in the water.

Answer

two liquid layers form because water and ethanol are immiscible.

Answer

volume of the solution is unchanged because ethanol is soluble in water.

Question 39

Which molecule would be least soluble in water?

Accepted Answer

$CH_3CH_2CH_2CH_2CH_2OH$

Answer

HCl

Answer

$CHCl_3$

Answer

$CH_3CH_2OH$

Question 40

Polyethene does not dissolve in water because …

Accepted Answer

it is very large and non-polar.

Answer

it is large and polar.

Answer

it is small and non-polar.

Answer

it is small and polar.

Question 41

The solubility of gases in water …

Accepted Answer

decreases with increasing temperature.

Answer

decreases with decreasing temperature.

Answer

increases with decreasing temperature.

Answer

increases with increasing temperature.

Question 42

Which substance would you expect to be totally insoluble in water?

Accepted Answer

$H_2$

Answer

$CO_2$

Answer

$O_2$

Answer

HCl

Question 43

When solutions of ionic compounds are mixed together …

Accepted Answer

a precipitate may form.

Answer

a precipitate will never form because both ionic compounds are soluble.

Answer

a precipitate will form if the solution is cooled.

Answer

a precipitate will always be formed.

Question 44

Which of the following lists contains only ionic compounds that are soluble at SLC?

Accepted Answer

$Na_2SO_4$, $CaCl_2$, $NH_4Cl$, $Fe(NO_3)_2$

Answer

$MgSO_4$, $BaCl_2$, KCl, $CaCO_3$

Answer

$K_2SO_4$, $CaBr_2$, $Zn(NO_3)_2$, $Fe(OH)_3$

Answer

$BaSO_4$, $PbCl_2$, $NH_4Br$, $FeSO_4$

Question 45

When solutions of potassium hydroxide and copper(II) chloride are mixed a precipitate forms. The balanced ionic equation for this reaction is …

Accepted Answer

$Cu^{2+}$(aq) + 2OH- (aq) --> $Cu(OH)_2$(s)

Answer

$K^+$(aq) + Cl−(aq) --> KCl(s)

Answer

$Cu^{2+}$(aq) + OH−(aq) --> CuOH(s)

Answer

$K^{2+}$(aq) + 2Cl-(aq) --> $KCl_2$(s)

Question 46

Which of the following pairs of aqueous solutions, when mixed, would result in the formation of a precipitate?

Accepted Answer

Na2SO4 and Ba(NO3)2

Answer

$CuSO_4$ and LiCl

Answer

$KNO_3$ and $ZnSO_4$

Answer

$NH_4Cl$ and NaOH

Question 47

Which of the following pairs of aqueous solutions, when mixed, would not result in the formation of a precipitate?

Accepted Answer

$NaNO_3$ and $(NH_4)_2CO_3$

Answer

NaCl and $AgNO_3$

Answer

$Sr(NO_3)_2$ and LiOH

Answer

$Pb(NO_3)_2$ and KI

Question 48

A system can be said to have reached equilibrium if …

Accepted Answer

the rate of the forward reaction is equal to the rate of the back reaction.

Answer

fresh reactants are continually being added.

Answer

all reactions have ceased.

Answer

there are no more visible changes in the system.

Question 49

In a saturated sucrose solution with undissolved sucrose present …

Accepted Answer

an equilibrium exists.

Answer

the sucrose is present in the solution as ions.

Answer

the solution can become supersaturated if more solid is added at the same temperature.

Answer

no equilibrium exists.

Question 50

When an ionic solid dissolves, which of the following does not take place?

Accepted Answer

Covalent bonds in the crystal are broken

Answer

Ion-dipole bonds form

Answer

Ionic bonds are broken

Answer

Some hydrogen bonds are broken

Question 51

A precipitate is most likely to form when …

Accepted Answer

the ions are able to bond more strongly to each other than to the surrounding water molecules.

Answer

the solution contains a group I metal ion.

Answer

the solution contains nitrate ions.

Answer

the ions are able to bond more strongly with the surrounding water molecules than to each other.

Question 52

In a calcium phosphate, $Ca_3(PO_4)_2$, solution the concentration of calcium ions is …

Accepted Answer

one and a half times that of the phosphate ions.

Answer

equal to that of the phosphate ions.

Answer

unrelated to the concentration of phosphate ions.

Answer

two thirds that of the phosphate ions.

Question 53

Which of these solutions of sodium chloride (M(NaCl) = 58.5 g mol−1) will have the highest concentration?

Accepted Answer

120 g dissolved in 4 L of water

Answer

1000 g dissolved in 80 L

Answer

5000 litres of 0.05 M solution

Answer

0.1 M solution

Question 54

The concentration of cadmium in a factory effluent that is considered safe to enter a water supply is 0.001 ppm. If 2000 L of water is to be discharged, what is the maximum mass of cadmium it may safely contain?

Accepted Answer

2 × $10^{-3}$ g

Answer

2 g

Answer

2 × $10^{-6}$ g

Answer

5 × $10^{-4}$ g

Question 55

Sulfur dioxide $(SO_2)$ is often added to wine as an antioxidant. A bottle of wine is labelled as containing 0.015% m/V of $SO_2$. The mass of $SO_2$ in a 750 mL bottle of wine would be closest to …

Accepted Answer

110 mg.

Answer

200 mg

Answer

5 mg

Answer

50 mg

Question 56

100 mL of 0.20 M NaCl is added to 100 mL of 0.20 M $MgCl_2$. The molar concentration of chloride ions in the mixture is

Accepted Answer

0.30 M

Answer

0.40 M

Answer

0.50 M

Answer

0.20 M

Question 57

The mass of $AgNO_3$ contained in 78.6 mL of a 0.912 M solution is …

Accepted Answer

12.2 g

Answer

1.22 × $10^3$g

Answer

1.22 g

Answer

122 g

Question 58

What volume of water should be added to 12 mL of 0.98 M $H_2SO_4$ to obtain a solution of concentration 0.056 M?

Accepted Answer

198 mL

Answer

200 mL

Answer

210 mL

Answer

222 mL

Question 59

23.8 mL of 0.88 M NaOH is diluted to 100 mL with distilled water. The concentration of the dilute solution is …

Accepted Answer

0.21 M

Answer

0.088 M

Answer

0.43 M

Answer

0.16 M

Question 60

What volume of water should be added to 50 mL of 0.29 M NaCl to produce a solution of concentration 0.15 M?

Accepted Answer

47 mL

Answer

100 mL

Answer

97 mL

Answer

50 mL

Question 61

The mass of silver chloride expected to precipitate when 20.0 mL of 0.150 M $AgNO_3$(aq) is added to an excess of $BaCl_2$(aq) is …

Accepted Answer

0.430 g

Answer

0.321 g

Answer

430 g

Answer

1.08 g

Question 62

The equation for the reaction of magnesium and hydrochloric acid is:    Mg(s) + 2HCl(aq) --> $MgCl_2$(aq) + H2(g)                                                                        If 2.1 mole of magnesium is reacted with 3.8 mole of hydrochloric acid, the …

Accepted Answer

magnesium is in excess.

Answer

hydrochloric acid is in excess.

Answer

two reactants are present in an exact ratio for the reaction.

Answer

magnesium will not be visible at the end of the reaction.

Question 63

100.0 g of water cools from 30.10°C to 25.05°C. How much heat energy is released?

Accepted Answer

2113 J

Answer

121 kJ

Answer

121 J

Answer

2113 kJ

Question 64

100.0 g of water at 25.00°C absorbs 100 J of heat. What is its final temperature?

Accepted Answer

25.24°C

Answer

24.76°C

Answer

25.00°C

Answer

0.24°C

Related quizzes

Related quizzes