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

0/6

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: 2
  • Passing grade: 60%
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1.
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
2.
If 2 g of hydrogen react with 16 g of oxygen, what mass of water forms?
18 g
16 g
12 g
36 g
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