What happens to atoms in a chemical reaction?
In a chemical reaction, atoms are rearranged into new formations.
They break existing bonds and form new bonds.
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How does the total mass change in a chemical reaction?
The total mass stays the same before and after a chemical reaction.
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Why is mass conserved in a chemical reaction even if there are temperature changes?
While energy is given out or absorbed, causing temperature changes, no atoms are gained or lost, so mass is conserved.
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What are the four main signs that a chemical reaction has occurred?
1. A colour change.
2. A gas is produced.
3. A solid is formed.
4. There is a temperature change.
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