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WorksheetsWeek 9 CCA Review 2019
Total questions: 42
Worksheet time: 26mins
Name
Class
Date
1.
A student measures the length of a strung three times: 0.93cm, 0.92cm and 0.91cm. The true value is 1.55 cm. Which is true?
a)
The student was accurate and precise.
b)
The student was accurate but not precise.
c)
The student was not accurate and not precise.
d)
The student was precise but not accurate.
2.
The atomic number tells you what?
a)
number of electrons
b)
number of protons
c)
number of neutrons
d)
both electrons and protons in an atom.
3.
What is the volume of 45.6 g of silver if the density of silver is 10.5 g/mL?
a)
0.23 mL
b)
4.34 mL
c)
479 mL
d)
none of the above
4.
Which liquid is the least dense?
a)
oil
b)
water
c)
syrup
d)
plastic bottle
5.
Romy's measurements: 6.02 m, 6. 04 m, 6.03 m
Actual Value: 6.02 m
How would you define her measurements?
Actual Value: 6.02 m
How would you define her measurements?
a)
precise
b)
accurate and precise
c)
accurate
d)
neither accurate or precise
6.
Accuracy is defined as
a)
close repeated measurements
b)
really good guessing
c)
measurement near the true value
d)
awesome measurements
7.
Find the density of a 2 cm x 2 cm x 2 cm cube with a mass of 64 g.
a)
6 cm3
b)
12 g/cm3
c)
128 g/cm3
d)
8 g/cm3
8.
This is an example of a
a)
physical change
b)
chemical change
9.
True or False: The density of a specific type of material never changes.
a)
True
b)
False
10.
DIFFERENT kinds of atoms chemically combined to form a substance are
a)
Mixture
b)
Element
c)
Compound
d)
Solution
11.
A homogeneous mixture has the same composition of particles throughout.
a)
True
b)
False
12.
Distilled water is
a)
a pure substance
b)
a mixture
13.
Alex goes into the garden and digs up a shovel full of dirt. This is a _____________ mixture.
a)
Homogeneous
b)
Heterogenous
14.
Grinding quartz crystals down to produce sand is an example of a
a)
change of state
b)
chemical change
c)
chemical reaction
d)
physical change
15.
Three examples of chemical changes are ____.
a)
sawing of wood, crushing a can, and toasting a marshmellow
b)
burning of gasoline, rotting of an egg, and exploding of fireworks
c)
boiling of water, bursting of a balloon, and melting of a candle
d)
freezing of water, evaporation of gasoline, and rusting of a nail
16.
A(n) __________ is a substance in which all the atoms in it are alike.
a)
colloid
b)
mixture
c)
element
d)
solution
17.
This is an example of a
a)
mixture of two compounds
b)
pure substance
c)
mixture of two elements
d)
mixture of element and compound
18.
In a mixture, the substances ______ be separated by a physical process
a)
can
b)
can not
c)
might
19.
in a compound, the substances ______ be separated by a physical process
a)
can
b)
can not
c)
might
20.
A tire is inflated with air is a ___________.
a)
chemical change
b)
physical change
21.
if a mixture is uniform throughout, it is
a)
heterogeneous
b)
homosexual
c)
homogeneous
d)
a compound
22.
If a mixture is NOT uniform throughout, it is ______.
a)
heterogeneous
b)
heterosexual
c)
homogeneous
d)
a compound
23.
Air is a_________.
a)
pure substance
b)
heterogeneous mixture
c)
homogeneous mixture
24.
Water and alcohol are easily separated by distillation because of their
a)
different densities
b)
different boiling points
c)
different colours
d)
different melting points
25.
Which of the following is an intensive property of a jar of marbles?
a)
The jar is 200 mL.
b)
The mass of the marbles is 220g.
c)
There are 78 marbles in the jar.
d)
The marbles are solid.
26.
When sugar dissolves in water, a chemical change has occurred.
a)
True: a new substance was formed.
b)
False: only one property changed.
c)
True: it happened by itself.
d)
False: no change occurred at all.
27.
Which of the following is MOST helpful in identifying an unknown substance?
a)
Extensive properties
b)
Intensive properties
c)
State of matter
d)
Ability to separate
28.
How can you be certain something is NOT homogeneous?
a)
The substance is pure.
b)
You can see differences between particles.
c)
Two samples of the substance have identical properties.
d)
There is only one freezing point.
29.
Rutherford discovered the...
a)
electron
b)
proton
c)
neutron
d)
nucleus
30.
Isotopes are elements with a different amount of
a)
protons
b)
neutrons
c)
electrons
d)
atoms
31.
an element will always have the same number of
a)
neutrons
b)
protons
c)
isotopes
d)
atoms
32.
Which particle does not contribute mass to the atom?
a)
Proton
b)
Neutron
c)
Electron
d)
Nucleus
33.
What scientist is best known for his gold foil experiment?
a)
J.J. Tomson
b)
Ernest Rutherford
c)
John Dalton
d)
Democritus
34.
An atom has 10 protons and a mass of 18. It has __ neutrons
a)
10
b)
18
c)
28
d)
8
35.
An ______________ is the same element, with the same number of protons, but different numbers of neutrons
a)
Atom
b)
Isotope
c)
Atomic Number
d)
Mass Number
36.
The mass number of an element that has18 protons, 18 electrons, and 19 neutrons is _____.
a)
12.5
b)
13
c)
25
d)
37
37.
How many neutrons does uranium-239 have
a)
92
b)
147
c)
239
d)
331
38.
How many protons are in an atom with an atomic number of 20, an atomic mass of 45, and a charge of +2?
a)
20
b)
10
c)
2
d)
18
39.
Find the average atomic mass
a)
28.1 g/mol
b)
.281 g/mol
c)
27.9 g/mol
d)
30.8 g/mol
40.
Find the average atomic mass of Nitrogen.
Nitrogen -14 has a percent abundance of 99.63
Nitrogen - 15 has an abundance of 0.3700
Nitrogen -14 has a percent abundance of 99.63
Nitrogen - 15 has an abundance of 0.3700
a)
14.00 g/mol
b)
1400 g/mol
c)
7.000 g/mol
d)
can not be determined
41.
Ernest Rutherford discovered that atoms were mostly _________________.
a)
negatively charged
b)
positively charged
c)
electrons
d)
empty space.
42.
J.J. Thomson provided evidence that an atom...
a)
is the smallest particle of matter
b)
contains negatively charged particles
c)
has an overall negative charge
d)
has an overall positive charge
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