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SC.90 CHEMISTRY EXAM
Write all answers on scantron sheet. Make no marks on this booklet.
Good luck!
CHAPTER 5
True / False (1 mark each)
1.
2.
3.
4.
5.
6.
7.
In any chemical change, the change is difficult to reverse.
Metals usually have a higher density than non-metals..
A solvent is dissolved in a solute to make a solution.
The only characteristic shared by all solutions is that they are homogeneous.
Alloys and substances like vinegar are solutions, but colloids and suspensions are
mechanical mixtures.
Density is a measure of the amount of mass contained in a certain volume of a
substance.
Physical properties of a substance include aspects such as colour, density, and
boiling point.
Matching
8.
9.
10.
11.
12.
(A. chemical change or
B. physical change)
Vinegar causes baking soda to fizz.
Rust forms on a car.
Wet clothes stiffen when hung on a clothesline in the winter.
A match is lit.
A light bulb glows.
Multiple Choice
13.
A)
B)
C)
D)
Which of the following is not part of the particle theory of matter?
All matter is made up of extremely tiny particles.
Each pure substance has its own kind of particle, which is different from the
particles of other pure substances.
Particles are always moving and attract each other.
The particles are known as atoms, molecules, and ions.
14.
A)
B)
C)
D)
During a physical change …
new substances are produced.
the particles are not changed.
heat is always released.
the products have different chemical properties from the reactants.
15.
A)
C)
16.
A block of an unknown metal has a mass of 37.3 g and a volume of 3.3 cm3. You
are asked to identify the metal using the chart below. Which metal is it?
Metal Density (g/cm3)
Metal Density (g/cm3)
lead 11.3
B)
nickel 8.9
iron 7.9
D)
tin
7.3
A)
C)
A block of wood 2 cm long, 3 cm wide, and 4 cm high has a mass of 25 g. What
is the density of the block? (volume = b x w x h)
0.96 g/cm3
B)
1.04 g/cm3
4.5 g/cm3
D)
600 g/cm3
17.
A)
C)
Which of the following is not a physical property?
flammability
B)
colour
density
D)
melting point
18.
A)
C)
Which of the following is not a chemical change?
rusting
B)
burning
baking
D)
dissolving
19.
A)
B)
C)
D)
A solution may be classified as a …
homogeneous pure substance.
solute and solvent chemically combined.
homogenous mixture with particles too small to be seen.
heterogeneous pure substance.
20.
A)
B)
C)
D)
Which of the following is not part of Dalton's atomic theory?
All matter is made up of small particles called atoms.
Atoms cannot be created or destroyed.
All atoms of the same element are identical.
Elements react with one another without a loss in mass.
21.
A)
C)
Which list is in order of increasing complexity of substances?
molecule, mixture, atom
B)
atom, molecule, mixture
atom, mixture, molecule
D)
mixture, molecule, atom
CHAPTER 6
True / False
22.
23.
24.
25.
The symbols for calcium, carbon, and chlorine are Ca, C, and Cl, respectively.
The symbol for an element always uses one or two letters from the English name
for the element.
A chemical formula uses letters and numbers to represent the composition of a
pure substance.
A molecule is the smallest particle of a pure substance.
26.
27.
28.
29.
The formula Ca(NO3)2 represents a compound having two atoms of calcium, two
atoms of nitrogen, and five atoms of oxygen.
The hydrosphere is that part of Earth where hydrogen is produced.
There are fewer elements that are conductors of electricity than are nonconductors of electricity.
The order in which pure metals are produced is: extraction, concentration,
decomposition.
Matching
30.
a costly metallic element
31.
an inert gas
32.
a coinage metal
33.
the lightest element
34.
a metalloid
a. copper
b. silicon
c. platinum
d. hydrogen
e. helium
Multiple Choice
35.
A)
B)
C)
D)
Tempering is a process in which ...
an ore is converted into a mineral.
a metal is made harder and more brittle by heating and cooling.
a blast furnace converts iron to steel.
two pieces of metal are welded together using an inert gas to prevent corrosion.
36.
A)
B)
C)
D)
A family of elements ...
is located in a vertical group on the periodic table.
is located in a horizontal row on the periodic table.
is a group of elements related by size and colour.
is another name for a period on the periodic table.
37.
What criteria did Mendeleev use to organize the elements in the first periodic
table?
Their atomic masses.
Their chemical properties.
Their physical properties.
All of the above.
A)
B)
C)
D)
CHAPTER 7
True / False
38.
39.
40.
41.
42.
43.
44.
A cathode ray will travel in a straight line away from the cathode toward the
anode unless it is influenced by a magnetic field or an electric field.
X-rays were so named because they came from the element xenon.
Rutherford suggested that the atom was mainly empty space.
A neutron is a subatomic particle having no charge and a mass about the same as
the electron.
The Bohr model says that there is a small nucleus containing the positive charge
and electrons in shells around the nucleus.
An atom of 14 6 C contains 6 electrons, 8 protons, and 6 neutrons.
The mass number of an element tells the number of protons and neutrons in the
nucleus.
Matching
45.
46.
47.
48.
49.
3 electrons, 3 protons, 3 neutrons
4 electrons, 4 protons, 5 neutrons
5 electrons, 5 protons, 6 neutrons
6 electrons, 6 protons, 6 neutrons
5 electrons, 5 protons, 8 neutrons
a. an isotope of Lithium
b. the heaviest atom
c. atomic mass of 11
d. a carbon atom
e. atomic number 4
Multiple Choice
50.
A)
B)
C)
D)
What happened during Rutherford's gold foil scattering experiment?
Most of the alpha particles reflected back toward the source.
Most of the particles went through the foil without deflection.
Most of the particles deflected a bit.
Most of the particles were absorbed by the gold foil.
51.
A)
B)
C)
D)
If a positively charged plate were brought close to a cathode ray, the ray would ...
not be affected.
first bend toward the plate and then would bend away from it.
bend away from the plate.
bend toward the plate.
52.
A)
C)
To which of these is the television picture tube closely related?
a spectroscope
B)
a Crookes tube
a cathode ray tube
D)
a gamma ray camera
53.
A)
C)
The modern periodic table has the elements arranged in order of increasing ...
mass.
B)
number of neutrons
mass number
D)
atomic number
54.
A)
C)
How many neutrons are in an atom of 238 92 U?
92
B)
146
238
D)
330
55.
A)
C)
Atoms that are isotopes ...
have the same atomic mass.
have the same number of neutrons.
B)
D)
have the same atomic number.
have different atomic numbers.
CHAPTER 8
True / False
56.
57.
58.
59.
60.
61.
All elements in a period have the same number of electrons in their outer shell.
Inert gases are also known as rare earths or noble gases.
All inert gases have 8 electrons in their outer shells.
When atoms react, they form a stable arrangement of electrons.
As you look to the right along any row on the periodic table, the elements show
an increasing reactivity.
On modern periodic tables, the following terms are used to determine the number
of subatomic particles.
- The atomic number tells the number of electrons or protons.
- The mass number tells the number of protons and neutrons.
- The group number tells the number of valence electrons.
Multiple Choice
62.
A)
B)
C)
D)
Elements in the same horizontal row on the periodic table ...
are members of the same family.
have the same number of outer shell electrons.
have the same number of shells of electrons.
have similar chemical properties.
63.
A)
C)
How many valence electrons are found in atoms of sodium?
1
B)
2
6
D)
8
64.
A)
B)
C)
D)
What does the electron arrangement of an element describe?
structure of an electron
number of electrons in each shell of an atom
way electron shells are arranged around the nucleus
attraction of electrons to the nucleus
65.
Which of the following has the correct electron arrangement for each ring?
i. potassium 2, 8, 7, 1
ii. sulfur
2, 8, 6
iii. oxygen
2, 6
A)
C)
E)
All are correct.
(i) and (ii) are correct.
(i) and (iii) are correct
66.
A)
B)
C)
D)
An ion is ...
the basic unit of molecular substances.
an atom that has gained or lost protons.
the attraction between metal and non-metal atoms.
a charged particle.
67.
A)
B)
C)
D)
Molecular compounds ...
are hard, high melting solids.
are held together by molecular bonds.
are formed when non-metals react with other non-metals.
are compounds like NaCl and MgO.
68.
A)
B)
C)
D)
A covalent bond ...
results when electrons are shared between two nuclei.
is formed when electrons are transferred from a metal atom to a non-metal atom.
is found between Na and Cl in NaCl.
fills one valence shell and empties another valence shell.
69.
A)
C)
Which of the following pairs of elements would likely form an ionic compound?
sodium and potassium
B)
potassium and barium
barium and sulfur
D)
sulfur and chlorine
70.
A)
C)
The periodic table was invented by who?
Rutherford
B)
O’ Sullivan
D)
B)
D)
None is correct.
(ii) and (iii) are correct.
Thompson
Mendeleev
WRITTEN QUESTIONS (30 marks)
NAME:_________________
CHAPTER 5 (3 marks)
Using the formulas for density, volume, and mass; calculate for the unknown variable
and show your work.
a) What is the mass of an object that has a density of 5.0g/L and a volume of 23L?
(2 marks)
ANSWER: _____________
b) What is the density of an object that has a volume of 67mL and a mass of 567g?
(2 marks)
ANSWER: _____________
c) What is the volume of an object that has a mass of 85kg and a density of 4.5kg/L?
(2 marks)
ANSWER: _____________
CHAPTER 6 (8 marks)
What are three characteristics of metals? (3 marks)
1.
2.
3.
What are three characteristics of non-metals? (3 marks)
1.
2.
3.
What are metalloids? Name the 8 metalloids? (2 marks)
Metalloids are..
.
LIST THE 8..
CHAPTER 7 (15 marks)
Fill in the following table: (1/2 mark each)
Element
Atomic #
27
Atomic mass
12
Protons
6
Neutrons
Electrons
74
53
59
Phosphorus
102
15
157
23
28
15
31
74
31
184
23
CHAPTER 8 (4 marks)
a) What is an ionic bond? How does it form? (1 marks)
b) What is a covalent bond? How does it form? (1 marks)
c) In the table below, draw diagrams to show how each pair of atoms forms bonds.
Remember the rule that a stable atom has an octet of electrons in the outer shell.
(2 marks)
IONIC COMPOUNDS-IONIC BONDS
NaCl
MOLECULAR COMPOUNDSCOVALENT BONDS
H2O
MgF2
SF2