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1) Distinguish between: a- an atom and a molecule; b- an atom and an ion; c-...

1) Distinguish between: a- an atom and a molecule; b- an atom and an ion; c- a molecule and a polyatomic ion. Give an example in each case.

2) What are some clues that a chemical reaction has occurred? Support your answer with examples.

3) One of the component of gasoline is the hydrocarbon named heptane, C7H16. Explain what constitute the molecule of heptane and describe it.(You may want to draw it, first and copy and paste into the topic post space).

Name the reactants and the products.

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