Curriculum
Course: Science — Second Preparatory
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Curriculum

Science — Second Preparatory

Unit 1: Matter and Energy

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Unit 2: Matter and Chemical Reactions

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Unit 3: Energy Flow in Photosynthesis and Respiration

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Unit 4: Geological Processes

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Quiz

Chemical Reactions — Lesson quiz

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  • Questions count: 6
  • Passing grade: 60%
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1.
What are the new substances formed in a chemical reaction called?
Products
Reactants
Catalysts
Solvents
2.
Which is a chemical change: sugar dissolving in water, or burning paper?
Sugar dissolving in water
Burning paper
Both are physical changes
Both are chemical changes
3.
Which pair of signs shows that a chemical reaction has occurred?
Melting of ice into water
Salt dissolving in water
A colour change and a gas being produced
A metal expanding when heated
4.
What happens to the total mass in a chemical reaction?
It always increases
It always decreases because gases form
It changes randomly depending on conditions
It stays the same, because mass is conserved
5.
If 2 g of hydrogen react with 16 g of oxygen, what mass of water forms?
18 g
16 g
12 g
36 g
6.
Why does iron need a coating?
To increase its mass and weight
To prevent it reacting with air and moisture and rusting
To turn it into a gas when heated
To make it permanently magnetic
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