Answer:
1. Chemical reactions
2.Substances
3. Properties
4. Precipitate
5. Light
6. Temperature
7. Color
8. Gas
Explanation:
Chemical reactions are known to produce new substances which have new properties. During the chemical reactions, evidences that are seen are formation of precipitate or light gel, production of gas and change in temperature and color.
Chemical reactions occur when chemical substances come together to react because those substances are compatible with each other.
18 electrons. With a -2 charge, that means it gains two electrons.
Explanation:
Here's an oxidation chart to help
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Just divide 2.50*10^25 by 6.02×10^23 to get to moles
