WorksheetsChemistry Test Review
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Two or more elements that are chemically combined together are what?
a)
a mixture
b)
a compound
c)
an element
d)
a solution
2.
A change in matter that produces a new substance is —
a)
a chemical property
b)
a physical property
c)
a chemical change
d)
a physical change
3.
4Fe + 3O2 → 2Fe2O3 What type of change has occurred in the chemical equation?
a)
identity change
b)
bonding change
c)
physical change
d)
chemical change
4.
Which is NOT an example of a chemical change?
a)
a burning newspaper
b)
the souring of milk
c)
a nail rusting
d)
ice melting into water
5.
The chemical formula for water is —
a)
HO
b)
H2O
c)
H2O2
d)
OH
6.
What is the correct configuration of atoms for hydrogen peroxide?
a)
2 hydrogen atoms; 2 oxygen atoms
b)
2 hydrogen atoms; 1 oxygen atoms
c)
2 helium atoms; 2 oxygen atoms
d)
1 helium atoms; 2 oxygen atoms
7.
Which example is an element?
a)
OH
b)
Co
c)
H2O
d)
CO2
8.
Which example is a compound?
a)
OH
b)
He
c)
Cl
d)
Si
9.
A substance that can NOT be broken down into any other substance chemically or physically is —
a)
a mixture
b)
an element
c)
a compound
d)
a solution
10.
The smallest part of an element, that still has the properties of that element, is —
a)
a nucleus
b)
an atom
c)
a molecule
d)
a compound
11.
A proton has which of the following charges?
a)
negative
b)
neutral
c)
magnetic
d)
positive
12.
What has a negative charge?
a)
a neutron
b)
a proton
c)
an electron
d)
the nucleus
13.
Two or more elements chemically combine together to form —
a)
a mixture
b)
a compound
c)
an element
d)
a solution
14.
All elements in the same group have the same number of —
a)
atomic mass units
b)
valence electrons
c)
neutrons
d)
protons
15.
Horizontal rows in the periodic table are called —
a)
groups
b)
periods
c)
families
d)
columns
16.
Using the table, how many protons are in an atom of oxygen?
a)
8
b)
16
c)
9
d)
24
17.
How many neutrons does Bromine have?
a)
80
b)
45
c)
44
d)
35
18.
The compound CO2 is composed of what?
a)
two carbon atoms and one oxygen atom
b)
two calcium atoms and one oxygen atom
c)
one carbon atom and two oxygen atoms
d)
one calcium atom and two oxygen atoms
19.
What does number 2 represent in the carbon atom?
a)
electron
b)
neutron
c)
proton
d)
nucleus
20.
The basic building block of all matter is-
a)
an element
b)
an atom
c)
a compound
d)
a mixture
21.
The periodic table is arranged -
a)
by the atomic number
b)
by the number of neutrons
c)
by symbols
d)
in alphabetical order
22.
Which of these belongs in the outermost shell (energy level) of an atom?
a)
neutrons
b)
photons
c)
electrons
d)
protons
23.
How many protons are in one atom of Boron?
a)
10
b)
11
c)
5
d)
6
24.
How many neutrons are in one atom of Vanadium?
a)
23
b)
28
c)
50
d)
51
25.
The compound of carbon dioxide is composed of one carbon atom and two oxygen atoms. What is holding the two elements together?
a)
physical formula
b)
physical connection
c)
chemical models
d)
chemical bonds
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