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Fundamentals of chemistry

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The changes in speed and motion of molecules when a solid becomes a liquid and when a liquid becomes a gas.
The physical means of separating a heterogeneous mixture of salt and sand.
Solving a problem using the scientific method.

Please discuss these statements.

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Chemistry multiple choice questions (chem-2)

1. A collection of atoms, molecules, or ions that contains Avogadro's number of these items is called what?
2. The initial substances that undergo change in chemical reaction are called what?
3. The law that states that atoms are neither created nor destroyed in a chemical reaction, but may be rearranged, is called what?
4. The mass of one mole of an element or compound (Also equal to the formula weight expressed in grams) is called what?
5. Which elements contain Avogadro's number of atoms per mole?
Calculate the formula weight of the following compounds"
6. Potassium hydroxide
7. HNO3

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