Florida Science Grade 6

Section 2: Chemical Properties and Changes

Chemical Properties and Changes

1.
A change in the chemical properties of a substance results in a __________.
A)new substance
B)fire
C)the same substance
D)a change of state
2.
The law of conservation of mass states that matter cannot be __________.
A)burned
B)changed
C)created or destroyed
D)hidden
3.
An example of a chemical change is __________.
A)melting
B)boiling
C)burning
D)freezing
4.
When iron rusts, it is reacting with __________ in the air.
A)nitrogen
B)water
C)oxygen
D)carbon dioxide
5.
Which of these can be broken down by electricity?
A)limestone
B)vitamins
C)sugar
D)water
6.
What is a good sign that a chemical change has occurred?
A)the production of heat, light, and smoke
B)the substance seems to have disappeared
C)the state of the matter has changed
D)the physical properties are the same
7.
Examples of chemical properties include __________.
A)color and shape
B)flammability and reactivity
C)length and mass
D)melting point and boiling point
8.
Where does all the mass of wood in a fire go after the fire burns itself out?
A)It changes state.
B)It disappears.
C)It turns into smoke and ash.
D)It turns into plasma and remains that way.
9.
Can mass be created or lost in a chemical change?
A)yes
B)sometimes
C)it has not yet been determined
D)no
10.
A substance has gone through a chemical change. Most likely, the resulting substance __________.
A)has been created
B)is the same as the old substance
C)has new physical properties
D)is a gas
11.
A substance is giving off heat, light, and smoke. Most likely the type of change that is occurring is __________.
A)a physical change
B)a chemical change
C)a change of state
D)a nuclear change
12.
Why are vitamins often sold in dark brown containers?
A)to stop any physical changes inside the bottle
B)to promote chemical changes in the vitamins
C)to prevent the vitamins from going through a chemical change from exposure to light
D)to make the vitamins more powerful
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