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Gr 8 - L1 - Chemical Properties of Substances Elaborate
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1
Which of the following best defines a chemical property?
A
A characteristic that describes how a substance interacts with other substances to form new substances.
B
A characteristic that describes the physical state of a substance at room temperature.
C
A characteristic that can be observed without changing the substance's identity.
D
A characteristic that measures how much matter is in a substance.
2
Which of the following is an example of a chemical property?
A
Flammability
B
Density
C
Color
D
Melting point
3
A student observes that a shiny iron nail left outside becomes covered with a reddish-brown flaky substance. What type of change has occurred?
A
Chemical change, because the nail became heavier.
B
Chemical change, because a new substance (rust) is formed.
C
Physical change, because the nail's shape changed.
D
Physical change, because the iron is still iron.
4
Which of the following properties is a physical property, not a chemical property?
A
Ability to rust
B
Flammability
C
Reactivity with acid
D
Boiling point
5
When magnesium burns in air, it produces a bright white light and a white powder. Which of the following best explains why this is a chemical change?
A
A new substance with different properties is formed.
B
The magnesium changes state from solid to gas.
C
The magnesium becomes hotter.
D
The magnesium's shape changes.