Ch 2 Question Preview (ID: 4480)
Physical Science.
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Which of the following is not a pure substance
a) element
b) molecule
c) compound
d) mixture
Which of the following is an element
a) salt
b) iron
c) nylon
d) sand
A group of atoms that acts as a unit is called a(n)
a) mixture
b) molecule
c) element
d) compound
Diamond is know for its
a) hardness
b) flammability
c) reactivity
d) all fo the answers are correct
What is the density of a sample liquid that has a volume of 125 mL and a mass of 200 g?
a) 75 g/mL
b) 16 g/mL
c) 1.6 g/mL
d) 0.625 g/mL
Helium is used in balloons because it is
a) reactive with rubber
b) lighter than air
c) flammable
d) a colored gas
An object's volume can be found by dividing its mass by its
a) pressure
b) temperature
c) density
d) weight
Which of the following is not a physical property of iron
a) melting point
b) ability to rust
c) color
d) conductivity
Which property of a substance is not affected by physical changes?
a) reactivity
b) size
c) shape
d) position
The difference substances in a mixture
a) keep their properties
b) combine chemically
c) form new molecules
d) cannot be separated
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