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Worksheets8th Grade Chemistry Test JARREAU
Total questions: 73
Worksheet time: 55mins
Name
Class
Date
1.
What is the charge of an electron?
a)
negative
b)
neutral
c)
no charge
d)
positive
2.
What two subatomic particles are found in the nucleus of an atom?
a)
Protons and electrons
b)
Electrons and neutrons
c)
Protons and neutrons
d)
Protons and atoms
3.
Which subatomic particle(s) makes up the majority of the mass of an atom?
a)
Protons
b)
Electrons
c)
Electrons and Neutrons
d)
Protons and Neutrons
4.
Which best describes the location and charge of a neutron?
a)
nucleus, neutral (no charge)
b)
electron cloud neutral
c)
nucleus, positive
d)
nucleus, negative
5.
How many atoms are present in the following compound?
a)
3
b)
48
c)
4
d)
47
6.
Which subatomic particle(s) determines the atomic number?
a)
protons
b)
neutrons
c)
electrons
d)
protons and neutrons
7.
Which element is in group 16, period 3?
a)
Arsenic
b)
Carbon
c)
Sulfur
d)
Boron
8.
How many protons does chlorine have?
a)
35
b)
17
c)
18
d)
4
9.
Which element is in group 16, period 3?
a)
Arsenic
b)
Carbon
c)
Sulfur
d)
Boron
10.
Which is not evidence of a chemical change?
a)
Bubbling or fizzing
b)
Unexpected temperature change
c)
Fire or smoke
d)
Phase change
11.
Two chemicals were mixed together and produced bubbles. What kind of change is happening?
a)
Physical change
b)
Chemical change
c)
Phase change
d)
none of the options
12.
Which is evidence of a chemical change?
a)
Rusting
b)
Unexected color change
c)
A precipitate was formed
d)
All options are correct
13.
When a new substance is formed, what kind of change has taken place?
a)
Physical change
b)
Chemical change
c)
Phase change
d)
None of the options
14.
Which is the best example of a chemical change?
a)
A wall was painted red
b)
A piece of paper was cut into 36 pieces
c)
A bike rusted in the rain over time
d)
Ice melted and turned into water
15.
The process of chewing food is an example of a
a)
physical change.
b)
chemical change.
c)
elemental change.
d)
atomic change.
16.
When stomach acid helps to break down food into smaller particles, this is an example of a:
a)
physical change.
b)
chemical change.
c)
elemental change.
d)
atomic change.
17.
In a balanced equation the number of atoms in the _____________ and _____________ must be equal.
a)
Product, reactant
b)
product, quotient
c)
product, sum
d)
reactant, reaction
18.
Is the equation below a balanced equation?
a)
Yes
b)
No
19.
Is the equation below a balanced equation?
a)
Yes
b)
No
20.
The group of elements and/or compounds after a chemical reaction has taken place are called
a)
reactions
b)
processes
c)
products
d)
reactants
21.
How many atoms of hydrogen are in the compound above?
a)
12
b)
24
c)
36
d)
3
22.
How many total atoms are in the compound above?
a)
3
b)
4
c)
5
d)
12
23.
How many total atoms are in the compound above?
a)
1
b)
3
c)
4
d)
8
24.
How many total atoms are in the compound above?
a)
1
b)
3
c)
4
d)
8
25.
How many elements are in the formula above?
a)
1
b)
3
c)
4
d)
8
26.
Is this an element, mixture, or compound?
a)
element
b)
mixture
c)
compound
27.
Is this an element, mixture, or compound?
a)
element
b)
mixture
c)
compound
28.
The scientific study of the structure, properties, and reactions of the chemical elements and the compounds they form.
a)
Chemistry
b)
Theory
c)
Law
d)
Control
29.
Balance this equation
Ca + H2O --> CaO + H2
Ca + H2O --> CaO + H2
a)
Ca + 2H2O --> CaO + 2H2
b)
2Ca + H2O --> CaO + H2
c)
It is already balanced
d)
Cannot be balanced
30.
Which of the following contains one oxygen atom?
a)
H2O
b)
CO2
c)
2N2O
d)
Co
31.
A scientist carries out a reaction in a test tube. After the bubbling stops, she notices that the test tube is very warm. What might she conclude about the reaction?
a)
The reaction happened very quickly.
b)
The reaction is endothermic.
c)
The reaction is exothermic.
d)
No reaction took place.
32.
If a chemical reaction is EXOTHERMIC, the temperature would....
a)
Stay the same
b)
Increase
c)
Decrease
33.
Baking bread and cooking an egg are examples of....?
a)
Endothermic processes
b)
Exothermic processess
34.
What does a represent?
a)
Proton
b)
Neutron
c)
Electron
35.
What is the symbol of this element?
a)
Calcium
b)
P
c)
Ca
d)
C
36.
What is the charge of a proton and where is it found?
a)
negative charge, nucleus
b)
positive charge, shells
c)
positive charge , nucleus
d)
neutral charge, nucleus
37.
What is the charge of a neutron, and where is it found?
a)
no charge, shells
b)
positive charge, nucleus
c)
neutral, no charge, nucleus
d)
negative charge, shells
38.
Water is an element?
a)
true
b)
false
39.
The amount of matter an object has.
a)
Weight
b)
Mass
c)
Volume
d)
Density
40.
______________ is the amount of space an object occupies.
a)
Weight
b)
Mass
c)
Volume
d)
Density
41.
What is happening at the boiling point?
a)
liquid to gas
b)
gas to liquid
c)
solid to liquid
d)
liquid to solid
42.
Water changes its state of matter when heat is added or taken away. When water reaches its boiling point the particles-
a)
are closer together
b)
stay the same
c)
are moving more rapidly
d)
are moving more slowly
43.
A gas
a)
has a definite shape but no definite volume
b)
has a definite volume but no definite shape
c)
has fast-moving particles
44.
Balloons can be twisted into shapes because
a)
the force exerted changes the number of particles
b)
the volume of a gas is constant
c)
particles of gas can be compressed
45.
Which is an example of a physical property?
a)
ability to react with acid
b)
state of matter
c)
flammability
d)
ability to react with oxygen
46.
Which of the following is a physical property?
a)
melting point
b)
flammability
c)
ability to rust
47.
Some clues of a chemical change include..
a)
Melting, Breaking, Crushing
b)
Bending,Boiling, Foaming
c)
Evaporating, Cutting, production of heat
d)
Fizzing, Foaming, Change in color
48.
If a Carbon atom has 6 protons, how many electrons will it have?
a)
2
b)
4
c)
6
d)
8
49.
What charge does a neutron have?
a)
+1
b)
-1
c)
No charge
50.
The atomic number of an element that has 9 protons, 9 electrons, and 10 neutrons is _____.
a)
9
b)
10
c)
19
d)
28
51.
The blue numbers in the image below represent ________
a)
I don't know, and don't want to try
b)
coefficients
c)
subscripts
d)
none of the answers are correct
52.
How many atoms of carbon (C) are in C6H12O6?
a)
3
b)
6
c)
12
d)
24
53.
In chemical reactions, what does the principle of conservation of mass mean?
a)
Matter is not created or destroyed.
b)
The total mass of the reactants is greater than the total mass of the products.
c)
The total mass of the reactants is less than the total mass of the products.
d)
Matter is not changed.
54.
The substances at the beginning of a chemical equation are called the ____
a)
product
b)
yield
c)
chemical symbol
d)
reactants
55.
What is the left part of a chemical equation called?
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
56.
What is the right part of a chemical equation called...
2H2 + O2 --> 2H2O
2H2 + O2 --> 2H2O
a)
Reactants
b)
Products
c)
Yields
d)
Chemical Equation
57.
Is the following equation balanced?...
Al + O2 --> 2Al2O3
Al + O2 --> 2Al2O3
a)
Yes!
b)
No!
58.
a copper penny turning greenish after a few years.
a)
Physical change
b)
Chemical change
59.
Which of the following IS a physical change?
a)
Getting a haircut
b)
Rusty metal
c)
sour milk
d)
A compound
60.
During an endothermic reaction, what happens to energy in relation to the surroundings?
a)
released to
b)
absorbed from
c)
mixed with
61.
During an exothermic reaction, what happens to energy in relation to the surroundings?
a)
released to
b)
absorbed from
c)
mixed with
62.
A compound is
a)
2 or more atoms of different elements chemically combined
b)
2 or more atoms chemically combined
c)
a mixture
d)
hydrogen
63.
Carbon dioxide and sodium chloride are examples of
a)
elements
b)
homogeneous mixtures
c)
compounds
d)
heterogeneous mixtures
64.
If 4g of salt is dissolved in 200g of water, what would the mass of the solution be?
a)
200g
b)
204g
c)
208g
d)
196g
65.
How many atoms of oxygen are in a molecule of glucose (C6H12O6)?
a)
12
b)
6
c)
18
d)
24
66.
the central region of an atom where its neutrons and protons are is its
a)
nucleus
b)
electron cloud
c)
core
d)
center
67.
an atom with atomic number 6 would have how many protons
a)
6
b)
12
c)
3
d)
cannot be determined
68.
How many elements are in the periodic table?
a)
210
b)
118
c)
98
d)
156
69.
What does the 1.00794 stand for?
a)
Hydrogen
b)
atomic number
c)
atomic mass
d)
atomic explosion
70.
What is the biggest difference between an atom of cobalt (Co) and an atom of nickel (Ni) as shown in the periodic table entries?
a)
An atom of nickel has more protons.
b)
An atom of cobalt has more electrons.
c)
An atom of cobalt has a lower number of neutrons.
d)
An atom of nickel has a higher value for atomic mass.
71.
Which number is the atomic mass of Argon?
a)
18
b)
40
c)
40 - 18 = 22
d)
40 + 18 = 58
72.
How many protons does Bromine have?
a)
167
b)
80 - 35 = 45
c)
35
d)
80
73.
What element can be found at group 14 period 5?
a)
Kr - Krypton
b)
Si - Silicon
c)
Cs - Cesium
d)
Sn - Tin
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