Chemistry Quiz - Physical and Chemical Changes
1. Examples of physical properties are:
A
corrosiveness and strength
B
flammability and ability to conduct electricity
C
melting point and solubility
2. Whether a substance is opaque, translucent or transparent is a measure of the physical property of:
A
the hardness of the substance
B
its ability to transmit light
C
its colour
3. In a change where a new substance is made and the change is difficult to reverse, that change is:
A
physical
B
chemical
C
melting
4. In chemistry, an example of a physical change is:
A
dissolving sugar in water
B
cooking a cake
C
growing
5. When a new substance is made in a chemical change, signs of this could be:
A
melting or freezing of the substance
B
dissolving or filtration of a substance
C
a colour change or bubbles
6. An example of a chemical change or reaction is:
A
mixing salt in water
B
burning wood
C
defrosting frozen food
7. In a chemical reaction, the chemicals one starts with are called the:
A
reagents
B
reacting chemicals
C
products
8. When wood is burnt, the product/s formed:
A
are the black remains and the gases given off
B
is only the black charcoal
C
is the unburnt wood
9. A chemical reaction that takes in heat energy during the reaction is called:
A
exothermic
B
endothermic
C
explosive
10. A chemical reaction that gives out heat energy is called:
A
endothermic
B
exothermic
C
explosive
11. Cooking a cake is:
A
a physical change
B
exothermic
C
an endothermic reaction
12. Some factors that affect the rates of all chemical reactions are:
A
temperature and concentration
B
melting and boiling points
C
catalysts only
13. In a combination type of chemical reaction, magnesium and oxygen are heated and combine to make:
A
magnesium sulphate
B
manganese dioxide
C
magnesium oxide
14. In a decomposition type of chemical reaction, copper carbonate is heated and breaks down to form:
A
CoO + CO
B
copper oxide and oxygen
C
copper oxide and carbon dioxide
15. The three requirements for a substance to burn or combust are the fuel to burn, oxygen gas and:
A
enough heat to start and continue the reaction
B
kerosene or methylated spirits
C
a fire extinguisher for safety
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