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Science, Gr. 9
Atoms & Elements Unit
Unit 3 Test
A. Word Matching (1 point each)
___ melting
a) a gas that is frozen to make dry ice
___ solution
b) a change in state from gas to solid, or from solid to gas
___ viscosity
c) the metric unit of volume for liquids
___ sublimating
d) the metric unit of mass
___ metre
e) a physical property that describes how a liquid flows
___ condensing
f) a change in state from gas to liquid
___ malleability
g) the ability of a substance to be formed into shapes
___ compound
h) the metric unit of length
___ gram
i) contains the protons and the neutrons in an atom
___ electron
j) contains more than one element
___ atomic number
k) a change in state from solid to liquid
___ nucleus
l) a form of an element with a different number of neutrons
___ mechanical mixture
m) pop (Sprite, Coke) is an example
___ litre
n) fruit loops and sand are an example
___ isotope
o) carries a negative charge; not in the nucleus
___ carbon dioxide
p) the same as the number of protons in an atom
B. True and False (1 point each)
___ Combustibility is the ability of a substance to react with acids
___ Sugar disappearing in water is an example of a solution
___ Raisins in Raisin Bran are an example of a solution
___ Lighting a test tube of acetylene gas is an example of a reaction with acid
___ Lighting a test tube of acetylene gas is a physical change
___ Tearing a piece of paper is a physical change
___ Burning a piece of paper is a chemical change
Use the periodic table for these ones:
___ A hydrogen atom has more protons than a helium atom
___ Nitrogen has 8 protons
___ There are 238 protons in Uranium
C. Draw (3 points each)
a) a Chlorine atom with no charge, and 18 neutrons
(use the Bohr-Rutherford model and electron shells)
b) a sugar cube dissolving in water (using the particle theory)
c) a Magnesium atom with no charge, and an atomic weight of 24
(use the Bohr-Rutherford model and electron shells)
D. Problem Solving
1. Do the following metric conversions: (1 point each)
M
k
h
megakilohecto-
NO PREFIX
c
m
1 000 000
1 000
100
106
103
102
1
101
centimilli-
1
100
1
1 000
10-2
10-3
1.5 kJ
= ____________ J
750 mL
= ____________ cL
20 300 cm
= ____________ km
201 MB
= ____________ kB
2. Find the exact atomic weight of the following isotopes. Show your calculations. (2 points each)
(A proton weighs 1.0073 u, and a neutron weighs 1.0087 u)
a) an element with 6 protons, and 7 neutrons
b) An oxygen atom with one more neutron than protons
3. Find the number of atoms in the following compounds: (1 point each)
a) NaHClO3 has ____oxygen atoms
b) CO2 has ____ oxygen atoms
c) CuSO4 – 5H2O has ____ hydrogen atoms
d) Fe(NO3)2 has ____ nitrogen atoms
4. Solve the following density problems. Always show your work. (2 points each)
d=M
V
V=d
M
M=dxV
a) A 1L jar of honey weighs 454 g. What is its density?
b) A container of ethanol has a density of 0.789 g/mL. What is the mass of a 2 mL container?
c) What is the volume of a container of water that contains 40 kg of water. Water has a density of
1 g/mL. (DO THE METRIC CONVERSION FIRST!)
E. Written Answers
1. Name the element you studied, saying ONE thing it can be used for, and why it is useful for
that. (K – 2 points, M – 2 points)
2. Why does a diet pop float, and a regular pop sink? Explain your answer well.