Topics from September 2020
- What are acids and bases?
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- What are crystals and what are Solutions?
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- What is oxygen and hydrogen?
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- How would you help me to understand what molecule is?
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- Why some metals are precious?
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- What are metals and how are they made?
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- Why is carbon such an important element?
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- What are the states of matter and their properties?
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- What is an atom?
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- How do you explain radioactivity?
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