Science 10
Name:
Chemistry Unit Review
Periodic Table, Elements, Atoms and Ions
1. A charged atom is called
a) an ion
b) a photon
c) a molecule
d) a subatomic particle
2.
An element’s atomic number tells
a) how many electrons its atom has.
b) how many electrons and protons its atom has
c) whether it is stable or non-stable.
d) how many compounds there are
3.
All electrons
a) have a positive charge.
b) have a negative charge.
c) are found in the nucleus of the atom
d) are motionless around the nucleus.
4.
The number of electrons an atom can give up, accept or share is called
a) the atomic number
b) the electron number
c) the bonding number
d) the combining capacity
5.
Which subatomic particles are found in the nucleus of atoms?
a) protons and electrons
b) protons and neutrons
c) neutrons and electrons
d) electrons only
6.
Lithium and sodium are metals that react strongly with water, producing hydrogen gas. Which of the
following metals would also be expected to have similar properties?
a) Mg
b) Al
c) Be
d) Cs
7.
Potassium has an atomic number of 19 and an atomic mass of 39. This means that each neutral atom
of potassium contains
a) 19 protons, 19 electrons, 19 neutrons
b) 19 protons, 19 electrons, 20 neutrons
c) 19 protons, 19 electrons, 39 neutrons
d) 19 protons, 39 electrons, 39 neutrons
8.
When the outer electron shell of an atom is full it means it is
a) reactive
b) stable
c) a charged particle
d) chlorine
9.
The noble gases are
a) stable.
b) unstable.
c) not on the periodic table.
d) not found in nature.
Use the following Bohr model diagram to answer question 10.
10. Which of the following is represented by the diagram above?
a) neon atom
b) carbon ion
c) magnesium ion
d) magnesium atom
Use the following Bohr model diagram to answer question 11.
11. How many valence electrons are illustrated?
a) 1
b) 7
c) 16
d) 17
12. How many unpaired electrons are present in a nitrogen atom?
a)
b)
c)
d)
2
3
5
7
13. Which of the following Lewis diagrams shows the valence electron arrangement for carbon?
14. Which of the following are characteristics of metals?
a)
b)
c)
d)
I only
I and III only
II and III only
I, II and III only
15. Which of the following elements is more reactive than sodium?
a) neon
b) lithium
c) potassium
d) magnesium
Ionic Compounds
16. A single atom of which of the following elements may combine with two fluorine atoms?
a) lithium
b) calcium
c) helium
d) sodium
17. Nitrate (NO3) is an example of
a) a polyatomic molecule
b) an acid
c) a base
d) an element
18. A new element, Yo, has been discovered. It forms compounds with the following formulas: YoCl2,
and YoS. Yo is an alkaline earth metal
a) this statements is supported by the information
b) this statement is refuted by the information
c) this statement is neither supported nor refuted by the information
19. Which of the following is the name for Na2(CO3)
a) sodium (II) carbonate
b) sodium cobalt
c) sodium carbon oxide
d) sodium carbonate
20. The correct chemical formula for the compound ammonium sulphate would be
a) NH4SO4
b) NH4(SO4)2
c) (NH4)2SO4
d) (NH4)2(SO4)2
21. The chemical formula for the compound copper (II) phosphate would be
a) CuPO4
b) Cu2(PO4)3
c) Cu(PO4)2
d) Cu3(PO4)2
22. Which of the following is an ionic compound?
a) H2
b) NH3
c) CO3 2K2Cr2O7
d)
23. Which of the following is an inorganic compound?
a) NO2
b) C3H8
c) C6H12O6
d) CH3COOH
24. How many atoms of each of the following elements are present in the compound copper (II) phosphate?
25. What is the name of the compound MnS2 ?
a) manganese sulphide
b) magnesium sulphide
c) manganese (II) sulphide
d) manganese (IV) sulphide
26. A new element has been discovered, element Z (symbol = Z). All we know is that it is a halogen (like
Cl and F). What is its formula when it combines with calcium?
a) CaZ
b) CaZ2
c) Ca2Z
d) Ca2Z2
Use the following Lewis diagrams of four unknown elements to answer question 27.
27. Which element will not combine with oxygen?
a) J
b) K
c) L
d) M
Covalent Compounds
28. The formula F2 represents
a) an ion
b) a diatomic molecule
c) a chemical reaction
d) two molecules of fluorine
Use the following Lewis diagram to answer questions 29 and 30
X and Z represent unknown elements from the periodic table.
29. Which of the following is represented by X : X ?
a) a noble gas
b) an alkali metal
c) a diatomic molecule
d) an alkaline earth metal
30. Which of the following products could be formed from the two molecules represented above?
a) water
b) neon gas
c) carbon dioxide
d) hydrogen fluoride
31. How many lone pairs and bonding pairs of electrons surround the central oxygen atom in a Lewis
diagram of water?
32. Which of the following is a representation for acetic acid (CH3COOH)?
a)
b)
c)
d)
I only
I and II only
I, III and IV only
II, III and IV only
33. What is the chemical formula for dinitrogen pentoxide?
a) NO
b) N2O5
c) N5O2
d) (N2O)5
34. In a covalent bond,
a) electrons are given or accepted
b) electrons are shared
c) protons are lost
d) neutrons are accepted
35. Which two of the following atomic models represents elements that can easily combine with each other
to form a covalent compound?
a)
b)
c)
d)
I and II
I and IV
II and III
III and IV
36. Which of the following represents the Lewis diagram of the molecule formed in the reaction shown
below?
Use the following illustration to answer question 37.
37. Which formula is represented by the illustration?
a) C3H7
b) 3CH3
c) CH3COOH
CH3CH2CH3
d)
38. Which of the following represents an organic molecule?
Acids, Bases, Salts and pH
39. Coffee has a pH of 5. Which of the following shows the correct colour of each pH indicator when a
small amount of black coffee is tested?
40. Which of the following is most likely to cause blue litmus paper to turn red?
a) soap
b) table salt
c) lemon juice
d) oven cleaner
41. Which of the following is the term given to the scale on which each unit represents a 10-fold change in
the hydrogen ion concentration?
a) pH
b) indicator
c) acid/base
d) neutralization
A student is given four test tubes. He is asked to determine whether the substance in each test tube is acidic,
basic or neutral. He makes the following observations:
42. Which of the following conclusions is supported by the observations?
a) Test Tube 1 is basic.
b) Test Tube 2 is neutral.
c) Test Tube 3 is acidic.
d) Test Tube 4 is acidic.
Use the following information to answer question 43.
43. Which of the following could be the “liquid alkali” that was poured into the Grand Canal?
a) HCl
b) H2O
c) NaCl
d) NaOH
44. Which of the following correctly classifies each formula as an acid, base or salt?
45. An acid can be described as
a) a substance that has a pH of greater than 7 and releases H+ ions
b) a substance that has a pH of less than 7 and releases OH- ions
c) a substance that has a pH greater than 7 and releases OH- ions
d) a substance that has a pH less than 7 and releases H+ ions
46. The products of a neutralization reaction
a) are salt and water with a pH greater than 7
b) are salt and water with a pH less than 7
c) are salt and water with a pH equal to 7
d) are acids and bases with a pH equal to 7
47. If you had acid indigestion (heartburn), which of the following products would you take to neutralize
the acid?
a) an acid
b) a base
c) water
d) salt
Chemical Reactions – types, balancing and conservation of mass and reaction rate
48. Which one of the following chemical equations is balanced?
a) SO2 + O2 SO3
b) 3SO2 + O2 3SO3
c) SO2 + 2O2 2SO3
d) 2SO2 + O2 2SO3
49. In what type of chemical reaction does one larger molecule react to produce two smaller molecules
a) synthesis
b) neutralization
c) decomposition
d) single replacement
Match each chemical reaction on the left with the best “Name of the Reaction” on the right. Each
Name of the Reaction may be used as often as necessary.
2NaBr + Cl2
50.
Br2 + 2NaCl
51.
2H2 + O2
52.
2KI + Pb(NO3)2
53.
2HgO ---> 2Hg + O
2H2O
a.
b.
c.
d.
synthesis
decomposition
single replacement
double replacement
PbI2 + 2KNO3
54. What is the coefficient needed in front of O2 in order to balance the following equation?
a)
b)
c)
d)
1
2
3
4
55. What type of reaction would be expected when sodium phosphate reacts with calcium chloride?
a) synthesis
b) combustion
c) decomposition
d) double replacement
56. Solid zinc reacts with sulphuric acid to produce hydrogen gas. What is the other product that would
result from this reaction?
a)
b)
c)
d)
O2
H 2S
H 2O
ZnSO4
57. If the compound HF reacts with KOH, what type of reaction has occurred?
a) combustion
b) neutralization
c) decomposition
d) single replacement
58. Which would provide the best data to support the Law of Conservation of Mass?
Use the following article to answer question 59
59. Which of the following are used to speed up this chemical reaction?
a)
b)
c)
d)
I only
I and II only
II and III only
I, II and III
60. Which set of ordered coefficients correctly balances the following equation?
a)
b)
c)
d)
1, 2, 3, 2
2, 1, 3, 2
2, 2, 1, 3
2, 3, 3, 1
Use the following information to answer question 61
61. Which of the following products would balance the reaction?
a) CO
b) CO2
c) 2CO
d) 2CO2
Use the following illustration of four reactant molecules of ammonia to answer question 62.
62. If four molecules of ammonia undergo decomposition, how many molecules of nitrogen and hydrogen
will form?
63. When calcium metal is added to water, it reacts to produce calcium hydroxide and hydrogen gas. Which
one of the following reactions would progress at the greatest rate?
Use the following information from a student’s experiment to answer question 64.
A student used three different catalysts to increase the rate at which H2O2 decomposes into O2 and
water. He filled in the Observation Chart below.
He also measured the volume of O2 produced during each reaction with different catalysts and
recorded the information on the graph below.
64. Which conclusion is supported by the observations?
a) MnO2 is the most effective catalyst.
b) Catalysts have no effect on reaction rate.
c) The reaction occurs most quickly if ZnO is added.
d) All three catalysts cause O2 to be produced at the same rate.