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:
Aexothermic
Bendothermic
Cexplosive
10. A chemical reaction that gives out heat energy is called:
Aendothermic
Bexothermic
Cexplosive
11. Cooking a cake is:
Aa physical change
Bexothermic
Can endothermic reaction
12. Some factors that affect the rates of all chemical reactions are:
Atemperature and concentration
Bmelting and boiling points
Ccatalysts only
13. In a combination type of chemical reaction, magnesium and oxygen are heated and combine to make:
Amagnesium sulphate
Bmanganese dioxide
Cmagnesium oxide
14. In a decomposition type of chemical reaction, copper carbonate is heated and breaks down to form:
ACoO + CO
Bcopper oxide and oxygen
Ccopper oxide and carbon dioxide
15. The three requirements for a substance to burn or combust are the fuel to burn, oxygen gas and:
Aenough heat to start and continue the reaction
Bkerosene or methylated spirits (also called denatured alcohol)
Ca fire extinguisher for safety

 

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