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Questions and Answers
What is a chemical reaction?
What is a chemical reaction?
- When reactants remain unchanged after interaction
- When a new substance with new properties is formed (correct)
- A physical change with no new substance formed
- When atoms are rearranged without forming new substances
In a chemical reaction, what happens to the constituent atoms of the reactants?
In a chemical reaction, what happens to the constituent atoms of the reactants?
- They are rearranged to form new substances (correct)
- They transform into different elements
- They remain unaffected
- They disintegrate completely
What distinguishes a physical change from a chemical change?
What distinguishes a physical change from a chemical change?
- Formation of new substances with new properties (correct)
- Rearrangement of atoms without any change in properties
- Complete disintegration of the original substances
- Change in physical appearance without new substance formation
Which of the following is an example of a physical change?
Which of the following is an example of a physical change?
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What kind of changes occur when copper sulphate reacts with iron?
What kind of changes occur when copper sulphate reacts with iron?
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How can you determine a chemical reaction?
How can you determine a chemical reaction?
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What allows differentiation between steam and water when they react with sodium?
What allows differentiation between steam and water when they react with sodium?
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When does a chemical reaction involve only a change in state?
When does a chemical reaction involve only a change in state?
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What happens during a physical change?
What happens during a physical change?
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