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Gr. 9 Chemistry Unit Review
Gr. 9 Chemistry Unit Review
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Grade 9 Academic Review for Chemistry
Flashcards
40 cards
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Practice quiz
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Questions
40
Answers
1
What statement about non-metals elements is true?
non-metals bend when hammered
most non-metals are good conductors
all non-metals are ductile
most non-metals are gases at room temperature
2
At the boiling point, a substance changes rapidly from
a solid to a liquid
a liquid to a solid
a liquid to a gas
a gas to a solid
3
Which of the following are in the Halogen Family?
Li K Cs
Cu Pb Fe
F Cl Br
He Ar Xe
4
What are the products of the decompostion of hydrogen peroxide (H
2
O
2
)?
two compounds
one element and one compound
two elements
three elements
5
Which one is a chemical change?
grinding wheat into flour
toasting marshmellows
dissolving sugar in tea
chopping wood
6
What is the charge on an electron?
positive
neutral
electric
negative
7
A burning splint was put into test tube and the flame went out. The gas is
oxygen
hydrogen
carbon dioxide
helium
8
Protons are found
outside with electrons
inside the nucleus
outside the nucleus
orbiting in energy shells
9
In Bohr's atomic model, the first electron orbit holds a maximum of___ electrons
8
2
1
4
10
The rows of the periodic table are called
cousins
families
periods
groups
11
A molecular compound is made up of
metal and metal
a metal and non-metal
non-metal and non-metal
metalloid and non-metal
12
A small amount of salt disappears in water. What kind of substance is this?
solution
compound
heterogeneous mixture
pure substance
13
A burning splint is placed in a test tube of unknown gas. It makes a "pop" The gas is
hydrogen
carbon dioxide
water vapour
oxygen
14
How can you tell burning sugar is a chemical change?
the sugar melted
it darkens
sugar became warmer
sugar changed shape
15
Rust is formed when iron combines with which chemical?
CO2
H2
O2
salt
16
The atomic number tells us the number of
electrons in outer orbit
neutrons
protons and neutrons
protons
17
Which is evidence a physical change has taken place?
change in colour
change of state
a gas is produced
a precipitate forms
18
How many hydrogen atoms are in C
6
H
12
O
6
24
18
12
6
19
Which of these elements exists as a diatomic molecule?
Mg
Mn
O
He
20
How many electrons are on the outer orbit of oxygen?
8
6
4
2
21
Which of the following is true about the particle theory of matter?
only particles of solid move
only liquid particles move
all particles are in constant motion
only gas particles move
22
What physical property describes the ability of a metal to shine?
malleability
lustre
hardness
ductility
23
In the periodic table, elements are arranged by
atomic mass
number of protons
number of neutrons
mass number
24
WHMIS stands for
Workplace Hazardous Material Information System
Warning Hazardous Materials Information Symbols
Watch out Hazards May Injury System
Work Hazards Might Injure Someone
25
A non-numerical observation that describes the qualities of an object.
quantitative
qualitative
inference
hypothesis
26
Pure water is an example of
element
solution
compound
atom
27
Salt is added to roads because it
makes the ices harder
makes the temperature hotter
lowers the freezing point
raises the freezing point
28
Which scientist was the plum pudding model of the atom?
Bohr
Rutherford
Thompson
Dalton
29
Which of these chemical formulas represents an element?
CaO
P4
K2S
C2H6
30
Aspirin has the formula C
9
H
8
O
4
. What is the total number of atoms?
17
13
21
12
31
The fomula for density is D= M/V. What is the formula for mass?
M= DxV
M= V/D
M= D/V
M= D
32
The outermost electron orbits of the noble gases all have
two electrons
one electron
maximum number of electrons
seven electrons
33
Which of the following is an element as well as a molecule?
O3
14kt gold
CO2
Ca
34
What is the property of metals that allows them to be hammered into thin sheets?
lustre
viscosity
ductility
malleability
35
What forms when atoms of different elements chemically join?
a diatomic element
a mixture
a different element
a compound
36
Which scientist used the gold foil experiment?
Einstein
Rutherford
Bohr
Dalton
37
Which of the following is a list of characterisitc physical properties?
acidity, lustre, viscosity
density, melting point, freezing point
malleability, conductivity, combustiblity
colour, boiling point, reactivity
38
Which of these elements in from the Alkali Metals family?
Si
Cl
Na
Mg
39
Which of these is a non-metal?
iron
lead
cobalt
chlorine
40
Clear apple juice is considered to be a
pure substance
compound
heterogeneous mixture
solution
