Test
Unit 2
Science 10
Mr Harvey
1. What are two properties that protons and neutrons have in common?
A. Both are found in the nucleus, and they have almost exactly the same relative mass
B. Both have the same electric charge (1–), and they have almost exactly the same relative mass
C. Both are found in the area surrounding the nucleus, and they have almost exactly the same relative mass
D. Both have the same electric charge (1+), and they have almost exactly the same relative mass
2. A glass of milk has both mass and volume. What accounts for most of the volume that the milk takes up in the glass?
A. The space taken up by the tiny electrons that surround the nucleus of each atom
B. The protons, which have the highest relative mass of any subatomic particle
C. The neutrons, which have the highest relative mass of any subatomic particle
D. The nucleus, which contains the protons and neutrons in each atom
3. What is the nuclear charge on an atom of nitrogen?
A. 0
B. 7+
C. 7–
D. 3–
4. Which element is described in the following sentence? “An atom of this element has 26 electrons and 30 neutrons.”
A. Iron
B. Beryllium
C. Zinc
D. Aluminum
5. Which element is in period three and group two?
A. Scandium
B. Magnesium
C. Boron
D. Sodium
6. What do fluorine, chlorine, bromine and iodine have in common?
A. They all have seven protons in their nucleus
B. They all belong to the noble gas family of elements
C. They all belong to period 17 on the periodic table
D. They all belong to the halogen family of elements
7. Which of the following is the most accurate description of a covalent molecule?
A. One or more metal atoms and one or more non-metal atoms share a bonding pair of electrons in their valence electron shells
B. At least one electron from a positive ion transfers to a negative ion to create a neutral compound
C. Two or more non-metal atoms share a bonding pair of electrons in their valence electron shells
D. Electrons transfer from one or more non-metal atoms to at least one other non-metal atom
8. How do Lewis diagrams differ from Bohr diagrams?
A. Lewis diagrams cannot be used to illustrate covalent molecules, while Bohr diagrams can show covalent molecules
B. Lewis diagrams show only the bonding (valence) electrons, while Bohr diagrams show all electrons in the atoms involved
C. Lewis diagrams are not used to illustrate ionic compounds, while Bohr diagrams can illustrate ionic compounds
D. Lewis diagrams show much more detail and information about the atoms involved than Bohr diagrams
9. Examine the following compound:
What is the most accurate description and name of this compound?
A. A Bohr diagram of carbon dioxide
B. A Lewis diagram of carbon dioxide
C. A Bohr diagram of sodium sulphide
D. A Bohr diagram of lithium oxide
10. An unknown sample of rock if found to contain very large, perfectly formed pink crystals in the shape of cubes. If the unknown
crystals turned out to be a pure substance, which the following would most likely be true?
A. The unknown substance would be an ionic compound, since the lighter colours are often associated with ionic compounds
B. The unknown substance would be a covalent compound, since covalent compounds generally form at lower temperatures
C. The unknown substance would be an ionic compound, since the ions will line up and form perfect crystals like this if possible
D. The unknown substance would be a covalent compound, since the shared bonding electrons in the valence shells make the
compound appear shiny
11. A compound forms between magnesium and bromine. Which of the following statements would be true?
A. The compound that forms would be covalent, its name would be magnesium dibromide, and its chemical formula would be
MgBr2
B. The compound that forms would be ionic, its name would be magnesium bromide, and its chemical formula would be MgBr 2
C. The compound that forms would be covalent, its name would be magnesium bromide, and its chemical formula would be
MgBr
D. The compound that forms would be ionic, its name would be magnesium bromide, and its chemical formula would be MgBr
12. Examine the following compound: Mn2O3. Which of the following statements is true?
A. The name of this ionic compound is manganese oxide
B. The name of this ionic compound is manganese (III) oxide
C. The name of this covalent compound is manganese (III) oxide
D. The name of this covalent compound is nitrogen trioxide
13. What is the name if the ClO2– polyatomic ion?
A. Chlorite
B. Chloride
C. Chromate
D. Chlorate
14. What is the name of the following covalent compound: Se3O7?
A. Triselenium oxide
B. Selenium heptoxide
C. Triselenium heptoxide
D. Selenium oxide
15. CuSO4 is an ionic compound that is used for a variety of tasks. It can be sprayed on fruits to control fungus growth, it can be
mixed in solutions to test for proteins and sugars, and it burns a bright blue-green.
What is the chemical name for CuSO4?
A. Copper sulphate
B. Copper (I) sulphate
C. Copper sulphur oxide
D. Copper (II) sulphate
16. You are told that a compound is formed between cobalt and another element. Which of the following statements is true?
A. Cobalt forms only ionic compounds, and cobalt forms a Co 2+ ion
B. Cobalt forms both covalent and ionic compounds with all other
C. Cobalt forms only ionic compounds, and cobalt is a multivalent metal with both Co2+ and Co3+ ions
D. Cobalt forms both covalent and ionic compounds with non-metal elements
17. What is the name of the compound (NH4)3PO3? Why is special about this compound?
A. Ammonium phosphite; this covalent compound is made up of two polyatomic ions, ammonium and phosphite
B. Ammonium phosphate; this ionic compound is made up of two polyatomic ions, ammonium and phosphate
C. Ammonium phosphate; this covalent compound is made up of two polyatomic ions, ammonium and phosphate
D. Ammonium phosphite; this ionic compound is made up of two polyatomic ions, ammonium and phosphite
18. CH4 = methane
NH3 = ammonia
C6H12O6 = glucose
H2O = water
Why are the binary covalent compounds CH4, NH3, C6H12O6 and H2O special?
A. Their naming is different from the usual method of naming binary covalent compounds, as they were discovered before a
naming system was developed
B. Each compound contains a polyatomic ion that behaves like a non-metal, as it shares electrons instead of transferring them
C. All four compounds can be classified as either ionic or covalent, depending on the temperature
D. None of these covalent compounds can be created in a chemistry lab. Each is formed naturally
19. Scandium and nitrogen form an ionic compound. Which of the following statements is true?
A. The compound they form is ScN. Ionic compounds are written with the smallest whole number ratio
B. The compound they form is ScN3. Ionic compounds are written so that the negative and positive charges balance
C. The compound they form is Sc3N3. Ionic compounds are written so that the negative and positive charges balance
D. The compound they form is Sc3N. Ionic compounds are written so that the negative and positive charges balance
20. Most portable barbeques use propane tanks, attached to the outside of the appliance, to provide the combustible propane to cook
food.
Which of the following is the correct balanced reaction?
A. C3H8 + 5O2 → 3CO2 + 4H2O
B. C3H8 + O2 → CO2 + H2O
C. C3H8 + O2 → 3CO2 + 2H2O
D. 2 C3H8 + 10O2 → 6CO2 + 8H2O
21. The following depicts the formation of methanol.
What would be the skeleton equation for this reaction?
A. C + Cl2 + O2 → CH3ClH
B. C + H2 + O2 → CH3OH
C. C2 + H2 + O2 → CH3OH
D. C + H + O → CH3OH
22. The following depicts the formation of methanol.
If the formula for methanol is CH3OH, what would be the balanced chemical equation for this reaction?
A. C + 2H2 + 2O → CH3OH
B. 2C + 2H2 + O2 → 2CH3OH
C. 2C + 4H2 + O2 → 2CH3OH
D. C3 + 2H2 + O2 → 2CH3OH
23. Balance the following skeleton equation:
Fe + Cl2 → FeCl3
A.
B.
C.
D.
Fe + Cl2 → FeCl3
Fe + 3Cl2 → 2FeCl3
2Fe + 2Cl2 → 2FeCl3
2Fe + 3Cl2 → 2FeCl3
24. Balance the following skeleton equation:
Pb(NO3)2 + AlCl3 → PbCl2 + Al(NO3)3
A.
B.
C.
D.
Pb(NO3)2 + 2AlCl3 → PbCl2 + 2Al(NO3)3
2Pb(NO3)2 + AlCl3 → PbCl2 + Al(NO3)3
Pb(NO3)2 + 3AlCl3 → 2PbCl2 + 3Al(NO3)3
3Pb(NO3)2 + 2AlCl3 → 3PbCl2 + 2Al(NO3)3
25. Write and balance the chemical equations for the following reaction:
glucose + oxygen → carbon dioxide + water
A.
B.
C.
D.
C6H12O6 + 6O2 → 6CO2 + 6H2O
C6H12O6 + O2 → CO2 + H2O
C6H12O6 + 3.5O2 → 2CO2 + 3H2O
2C6H12O6 + 4O2 → 4CO2 + 6H2O
26. Write and balance the chemical equation for the following reaction:
ammonium carbonate → ammonia + carbon dioxide + water
(NH4)2CO3 → NH3 + CO2 + H2O
A.
B.
C.
D.
(NH4)2CO3 → 2NH3 + 2CO2 + 2H2O
2(NH4)2CO3 → 2NH3 + CO2 + H2O
(NH4)2CO3 → NH3 + CO2 + H2O
(NH4)2CO3 → 2NH3 + CO2 + H2O
27. Which of the following common kitchen items is classified as being an acid?
A. Baking soda
B. Dish soap
C. Eggs
D. Lemon juice
28. In a test of pH levels, a glass of milk was found to have a pH of 6.0. A glass of grape juice had a pH of 3.0.
What is the relationship between the pH levels of the milk and grape juice?
A. The grape juice is 1000 times more acidic than the milk
B. The grape juice is 3 times more acidic than the milk
C. The milk is 1000 times more acidic than the grape juice
D. The milk is 3 times more acidic than the grape juice
29. In describing acids and bases, acids are described as being “sour”, while bases are “bitter”.
If this is the case, why should chemicals never be tested by taste or smell?
A. Human taste is not accurate enough to distinguish between “sour” and “bitter”
B. pH cannot be measured by smell
C. Some acids and bases are very corrosive, and can burn your throat, stomach, nose, and skin on contact
D. Some bases are sour, and some acids are bitter
30. Which of the following items would turn blue litmus paper red?
A. Ammonia
B. Eggs
C. Pure water
D. Tomatoes
31. What colour would phenolphthalein indicator be in a solution with a pH of 10?
A. Blue
B. Colourless
C. Pink
D. Yellow
32. Tomato juice normally has a pH of about 4, which can cause indigestion in some people. By adding water, however, the juice
becomes less acidic. Which indicator would best reveal when the pH would rise to 6?
A. Bromothymol blue
B. Litmus
C. Methyl orange
D. Methyl red
33. An unknown material must be identified in a chemistry lab. Several properties of the material were noted once it has been
dissolved in water:
I.
II.
III.
IV.
The material conducted electricity.
The material made a phenolphthalein solution appear colourless.
The material would irritate human skin.
The material had no effect on various metals tested.
Which of the following is the most accurate conclusion based on the results listed?
A. The results are inconclusive
B. The unknown material is a strong acid
C. The unknown material is a weak acid
D. The unknown material is a weak base
34. What is the name of the compound H2CrO4 when it is present in an aqueous solution?
A. Chromeatic acid
B. Chromic acid
C. Hydrochromic acid
D. Hydrogen chromate acid
35. What is the chemical name of the compound H2S when it is present in an aqueous solution?
A. Hydrogen sulphur acid
B. Hydrosulphuric acid
C. Sulphuric acid
D. Sulphurous acid
36. Which of the following statements would be true of a solution with a pH of 3.1?
A. The solution would conduct electricity, would not react with metals, and would contain H + ions
B. The solution would conduct electricity, would react with metals, and would contain H+ ions
C. The solution would conduct electricity, would react with metals, and would contain OH – ions
D. The solution would not conduct electricity, would react with metals, and would contain H + ions
37. Which of the following is the best definition of a salt?
A. Sodium chloride
B. Any chemical compound that has been iodized in food products to help prevent goiter
C. A mineral found in seawater, Canadian mines and rock deposits
D. An ionic compound that is formed during the reaction of an acid and a base
38. What is the name of the reaction type that occurs when acids and bases react to form a salt and water?
A. Acidification
B. Neutralization
C. Basifying
D. Combustion
39. Metal oxides, such as MgO, can dissolve in water. What is true about the solution these metal oxides form?
A. The solution is acidic
B. The solution is salty
C. The solution is basic
D. The solution is neutral
40. Non-metal oxides, such as N2O5, can dissolve in water. What is true about the solution these non-metal oxides form?
A. The solution is acidic
B. The solution is basic
C. The solution is neutral
D. The solution is salty
41. Acid precipitation appears to effect lakes in eastern Canada far more than those in western Canada. Which of the following
statements helps to explain why?
A. Lakes in eastern Canada do not have natural calcium carbonate deposits to neutralize the acid precipitation like western
Canadian lakes do
B. There are no sources of acid precipitation in western Canada, so the problem only exists in eastern Canada
C. Calcium carbonate deposits decrease the pH of lakes found in eastern Canada, but not in western Canada
D. Governments in western Canada have been liming their lakes for many years, while eastern Canadian provinces have only
been liming for the past 10 years
42. What are the products of the following acid-base reaction between hydrofluoric acid and ammonium hydroxide?
HF + NH4OH →
A.
B.
C.
D.
NHF2 + H2O
NF4F + H2O
NH3 + HF + H2O
NH4F + H2O
43. In the following acid-base neutralization reaction, what term best describes the sodium acetate produced?
CH3COOH + NaOH → NaCH3COO + H2O
A.
B.
C.
D.
Salt
Base
Acid
Neutralization agent
44. An unknown chemical is burned in the presence of oxygen. The powder produced after burning is then dissolved in water, and the
pH of the solution measures 10.2. What could the unknown chemical be?
A. Calcium, Ca
B. Glucose, C6H12O6
C. Methanol, CH3OH
D. Silicon dichloride, SiCl2
45. Burning phosphorous in the presence of oxygen creates a brilliant white flame, and white flecks are deposited on the inside of the
burning container. If water is added to the white flecks, what colour would the indicator methyl red be when added to the
solution?
A. Blue
B. Colourless
C. Red
D. Yellow
46. Which of the following elements is rarely found in organic molecules?
A. Oxygen
B. Hydrogen
C. Zinc
D. Carbon
47. Which of the following compounds would most likely be classified as being inorganic?
A. C2H8
B. K2HC6H5O7
C. C8H10N4O2
D. KCl
48. Which of the following compounds is a hydrocarbon?
A. C6H14
B. C6H12O6
C. C8H10N4O2
D. CH3CH2OH
49. Which of the following compounds is an alcohol?
A. C4H9OH
B. C6H12O6
C. C8H10N4O2
D. C6H14
50. By adding one oxygen molecule, and removing one hydrogen, the compound butane can become the compound C4H9OH. What
would be a likely name for this new compound?
A. Butanic acid
B. Tetracarbon decahydrogen oxide
C. Butanol
D. Pentanol
51. Which description would best describe the compound shown below?
C8H10N4O2
A. Inorganic atom
B. Organic atom
C. Inorganic molecule
D. Organic molecule
53. In a chemical reaction, a hydrocarbon compound reacts with the diatomic element oxygen. What type of reaction is this?
A. Single replacement
B. Formation
C. Double replacement
D. Combustion
54. Which of the following chemical reactions could be classified as either a double replacement reaction or as an acid-base
neutralization?
A. AgNO3 + Na2CrO4 → Ag2CrO4 + NaNO3
B. NaOH + FeCl3 → NaCl + Fe(OH)3
C. NaCl + H2SO4 → Na2SO4 + HCl
D. NaOH + HCl → NaCl + HOH
52. Which description would best describe the compound shown below?
A.
B.
C.
D.
Inorganic atom
Organic molecule
Inorganic molecule
Organic atom
55. What type of reaction is shown below, and what is the balanced formula equation for this reaction?
magnesium + water → magnesium hydroxide + hydrogen gas
A.
B.
C.
D.
Single replacement; Mg + H2O → Mg(OH) 2 + H2
Double replacement; Mg2 + 3H2O → 2Mg(OH) 2 + H2
Double replacement; Mg2 + 2H2O → Mg(OH) 2 + H
Single replacement; Mg + 2H2O → Mg(OH)2 + H2
56. Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or
combustion reaction?
C10H8 + 12O2 → 10CO2 + 4H2O
A.
B.
C.
D.
Single replacement
Synthesis
Combustion
Decomposition
57. Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or
combustion reaction?
Na2CO3 → Na2O + CO2
A.
B.
C.
D.
Synthesis
Combustion
Decomposition
Single replacement
58. What type of reaction is shown below, and what is the balanced formula equation for this reaction?
copper metal + silver nitrate → silver metal + copper II nitrate
A.
B.
C.
D.
Synthesis; Cu + AgNO3 → Ag + Cu(NO3)2
Single replacement; Cu + 2AgNO3 → Ag2 + Cu(NO3)2
Double replacement; Cu2 + 2AgNO3 → 2Ag2 + Cu(NO3)2
Single replacement; Cu + 2AgNO3 → 2Ag + Cu(NO3)2
59. Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or
combustion reaction?
NaOH + H2CO3 → Na2CO3 + H2O
A.
B.
C.
D.
Single replacement
Neutralization
Synthesis
Decomposition
60. Is the following reaction a synthesis, decomposition, single replacement, double replacement, neutralization (acid-base), or
combustion reaction?
Li2O + H2O → LiOH
A.
B.
C.
D.
Single replacement
Combustion
Synthesis
Decomposition
61. Why does increasing the temperature of the reactants increase the rate of a chemical reaction?
A. Heat energy increases the size of the molecules of reactants, and therefore the molecules react more frequently
B. Heat energy causes some of the reactants to evaporate, increasing the concentration of the reactants
C. Heat energy causes the particles of the reactants to move faster, and therefore react with each other more frequently
D. Heat energy helps to lower the amount of overall energy that is required for the reaction to occur
62. Why are many types of food stored in refrigerators?
A. Bacteria do not grow well in dark places
B. Refrigerators often contain enzymes that slow the rate of food spoiling reactions
C. The lower temperatures cause the chemical reactions that spoil food to occur more slowly than usual
D. The volume inside the refrigerator decreases the concentration of the food particles, allowing them to decompose more
slowly
63. Which of the following methods for increasing the rate of chemical reaction increases the effectiveness of the interactions
between reactants, instead of just causing the reactant molecules to bump into each other more frequently?
A. Increasing the temperature of the reactants
B. Adding a catalyst to the reactants
C. Increasing the surface area of the reactants
D. Increasing the concentration of the reactants
64. A chemical reaction between two substances is occurring in an aqueous solution. What can be done to increase the rate of
reaction?
A. Pour the reactants into a large, flat container to increase the surface area
B. Increase the concentration of the reactants by adding more to the solution
C. Rapidly cool the container that the reactants are in
D. Add a catalytic converter