1. Quarterly Review
1st Quarter
Units 1,2, and 3

2. 1. Which of the following is a chemical change?
A. water boiling B. paper being cut C. ice melting D. iron rusting

3. 2. Which is a clue that a chemical change has occurred?
A. A beaker becomes warm when you mix two room-temperature liquids in it. B. A liquid forms bubbles when it reaches a high temperature. C. Water changes color when you add food coloring to it. D. A car door feels hot if you touch it on a summer afternoon.

4. 3. According to the law of conservation of mass, which of the following is a true statement about any chemical reaction?
A. The total mass of the reactants is greater than the total mass of the products. B. The total mass of the reactants is less than the total mass of the products. C. The total mass of the reactants is equal to the total mass of the products. D. In a chemical reaction, matter can be created but not destroyed.

5. 4. Which is always true of a balanced chemical equation?
A. Coefficients on both sides of the equation are multiples of 2. B. The subscripts on one side of the equation are the same as the subscripts on the other side. C. The number of molecules is the same on both sides of the equation. D. Both sides of the equation contain the same elements and the same number of atoms.

6. 5. Which of these is a pure substance?
A. smoke B. iced tea C. calcium D. apple

7. 6. Since iron oxide is classified as a compound, what would a sample of it contain?
A. a solution of atoms and molecules B. more than one kind of atom C. atoms that are gases, liquids, and solids D. matter that cannot be reduced to atoms

8. 7. Which property of matter can easily be determined by looking at the periodic table?
A. reactivity B. solubility C. density D. boiling point

9. 8. Which subatomic particles determine the reactivity of groups of elements in the periodic table?
A. protons B. electrons C. neutrons D. atoms

10. 9. Which of these determines the identity of an element?
A. number of protons B. number of neutrons C. number of energy levels D. number of protons + neutrons

11. 10. Sodium is an element that contains 11 protons and 12 neutrons
10. Sodium is an element that contains 11 protons and 12 neutrons. How many electrons are found in an atom of sodium?
A. 12 B. 1 C. 11 D. 23

12. 11. How are the elements in the modern periodic table arranged?
A. in alphabetical order B. by atomic mass C. by date of discovery D. by number of protons

13. 12. Which of these statements about the periodic table is TRUE?
A. All elements along the stairstep line have properties of nonmetals only. B. Elements at the bottom of a column have more protons than elements at the top of a column. C. Elements on the left side of a period always have higher atomic mass than elements on the right side of a period. D. Most of the known elements are nonmetals.

14. Answers
1. D 8. B 2. A 9. A 3. C 10. C 4. D 11. D 5. C 12. B 6. B 7. A