CHECK YOUR FACTS
1. Name and describe the two categories of matter.
2. What are substances called that cannot be broken down into simpler substances by ordinary chemical means?
3. Explain the difference between an element and compound.
4. What is another name for a homogeneous mixture?
5. Are electrons found inside or outside the nucleus of an atom?
6. Identify the symbols for the following element. a. sulfur b. phosphorus c. hydrogen.
7. Name the element represented by each of the following symbols a. C b. N c. CI d. Ca e. Na.
8.write the formulas of the following compounds: a. sodium chloride b. water c. glucose.
9. Name the parts of a chemical equation.
10. What happens to electrons when ionic compounds are formed? When covalent compounds are formed?
11. Explain the differences between chemical and physical changes.