WorksheetsCompounds, mixtures, and pure substances
Total questions: 16
Worksheet time: 14mins
Name
Class
Date
1.
Sugar is added to water and the mixture is stirred. Which observation is evidence that the sugar dissolved in the water?
a)
Less sugar is visible.
b)
The water is cloudy.
c)
The sugar turned into crystals.
d)
Bubbles formed in the water.
2.
Which chemical cannot be further broken down into other chemicals using ordinary laboratory processes?
a)
1
b)
2
c)
3
d)
4
3.
What process will BEST separate these components?
a)
using a magnet, filtration, and evaporation
b)
using a magnet, a blender, and filtration
4.
Which of these will BEST separate a saltwater solution
a)
allowing the water to evaporate
b)
allowing the salt to settle
5.
Which substance is composed of only one type of atom?
a)
water
b)
gold
6.
Which type of matter can be separated by physical means?
a)
compound
b)
mixture
7.
A student is testing a solid material to determine whether it is a pure substance or a mixture. Which observation would MOST likely indicate that the material is a mixture?
a)
The material has crystals of two different colors.
b)
The material does not melt when it is heated over a burner.
8.
Which describes a property of all elements?
a)
All elements are metals.
b)
All elements are pure substances.
9.
Which is a compound?
a)
Nitrogen
b)
Ammonia
10.
Sodium chloride (NaCl) is formed in a chemical reaction between sodium and chlorine . What is sodium chloride?
a)
a mixture
b)
a compound
c)
cheesecake
11.
Which of these are broken down during chemical, but not physical, changes?
a)
elements
b)
mixtures
c)
compounds
12.
When oxygen combines with hydrogen, which substance is formed?
a)
water
b)
hydrochloric acid
13.
In order to form water, two hydrogen atoms and one oxygen atom must be
a)
mixed
b)
bonded
c)
divided
14.
A student needs to find the mass of an atom. The numbers of which atomic particles determines the mass of the atom?
a)
only its protons
b)
only its electrons
c)
both its protons and neutrons
d)
both its neutrons and electrons
15.
Which of the following is an example of a compound?
a)
copper
b)
iron
c)
water
16.
What did the five fingers say to the face?
a)
SLAP!
b)
What?
100 %
