WorksheetsChemistry Unit Test
Total questions: 25
Worksheet time: 13mins
Name
Class
Date
1.
Which is Not a compound?
a)
H2O
b)
CO2
c)
Fe2O3
d)
Na
2.
Which is most likely the chemical formula for this model?
a)
H20
b)
CO2
c)
H202
d)
NaCl
3.
Which is a mixture?
a)
pure water
b)
sugar
c)
kool-aid
d)
carbon
4.
Nitrous oxide (N2O) is a gas sometimes used in dental offices. Which of these is the correct classification for nitrous oxide?
a)
An atom
b)
A mixture
c)
An element
d)
A compound
5.
Chocolate melting on a sidewalk is an example of _____ .
a)
a physical change
b)
a chemical change
c)
no change
d)
an electron change
6.
Water, sugar, salt, and carbon dioxide are all examples of _____ .
a)
elements
b)
compounds
c)
mixtures
d)
atoms
7.
Water is a compound with the chemical formula H2O. What does the “2” tell you?
a)
Oxygen has 2 protons.
b)
There are two oxygen atoms to every 1 hydrogen
c)
There are two hydrogen atoms to every 1 oxygen
d)
Oxygen has 2 electrons.
8.
The simplest pure substances that are only made up of one kind of atom and cannot be broken down into any other substances are _______________ .
a)
elements
b)
solutions
c)
mixtures
d)
compounds
9.
Carbon, hydrogen, oxygen, nitrogen, iron, sodium, and chlorine are all examples of _____ .
a)
elements
b)
solutions
c)
compounds
d)
mixtures
10.
_____________ are made of 2 or more different elements that are chemically combined in a specific ratio.
a)
elements
b)
atoms
c)
compounds
d)
mixtures
11.
When two or more substances are physically combined and NOT chemically bonded, they form ______________.
a)
elements
b)
atoms
c)
compounds
d)
mixtures
12.
How many total atoms are in the chemical formula C6H12O6?
a)
3
b)
6
c)
12
d)
24
13.
Because a mixture is physically combined, then it can be ____________ separated relatively easily.
a)
atomically
b)
chemically
c)
physically
d)
molecularly
14.
The smallest particles of an element are called _____.
a)
compounds
b)
protons
c)
mixtures
d)
atoms
15.
__________ are the negatively charged, subatomic particles found in the orbits around the outside of the nucleus of an atom.
a)
protons
b)
neutrons
c)
electrons
d)
atoms
16.
Which subatomic particles of the atom are found inside the nucleus of an atom?
a)
electrons and neutrons
b)
protons and neutrons
c)
protons and electrons
d)
protons only
17.
A mixture that is NOT well-mixed and the different particles can be clearly seen is called a ______________ mixture.
a)
heterogeneous
b)
homogeneous
c)
solution
d)
colloid
18.
Which of the following is a homogeneous mixture?
a)
Trail mix
b)
Cereal
c)
Salt Water
d)
Muddy Water
19.
According to this picture, air is a ____________.
a)
compound
b)
mixture
c)
element
d)
molecule
20.
Salt water is a well-mixed mixture that looks like only one substance with tiny particles, so it is considered a ________________________.
a)
solution
b)
colloid
c)
suspension
d)
compound
21.
Which of these are NOT a common way to separate mixtures?
a)
settling
b)
filters and strainers
c)
evaporation
d)
chemical changes
22.
Mixtures can be chemically separated by their physical properties.
a)
True
b)
False
23.
The primary difference among a solution, colloid, and suspension is the ____________ of their particles.
a)
heat
b)
size
c)
color
d)
mass
24.
Because molecules are formed by 2 or more atoms bonding together, molecules can make up _____________.
a)
Both elements and compounds
b)
Only elements
c)
Only compounds
d)
Only mixtures
25.
Which of the following is FALSE?
a)
Elements are composed of only ONE kind of atom.
b)
Compounds are 2 or more different elements physically combined.
c)
Atoms are composed of protons, neutrons, and electrons.
d)
Atoms, elements, compounds, molecules, and mixtures are all examples of matter.
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