1. Which of the following is one way to prevent the corrosion of iron?

Question

A. Paint exposed iron parts with protective paint.
B. Protect the iron from polluted air.
C. Add carbon to the iron.
D. Let the iron develop a natural coat of carbonate.

2. The source of the sun's heat is
A. nuclear fusion.
B. nuclear disintegration.
C. nuclear separation.
D. nuclear fission.

3. Which of the following will result in a chemical change?
A. Drying wood in a shed
B. Evaporating alcohol into vapor
C. Melting ice to obtain water
D. Burning coal in a furnace

4. A solution that contains a small amount of salt and a large amount of water is said to be a _______ solution.
A. unsaturated
B. concentrated
C. saturated
D. dilute

5. Which one of the following is a characteristic of a metal?
A. Conducts heat readily
B. Changes the color of litmus paper to red
C. Reacts with bases to produce salts
D. Becomes negative when combined with other elements

6. Which one of the following chemical equations is balanced?
A. NH 3 + H2 O → 2NH4 OH
B. KOH + H2SO4 → KHSO4 + H2O C. 2Na + S → 2NaS
D. 2NaCl + H 2SO 4 → HCL + NaSO 4

7. A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _______ reaction.
A. substitution
B. combination
C. double replacement
D. decomposition

8. In a nuclear reaction, energy is released by the combination of two elements into a new element. This process is an example of
A. natural radioactivity.
B. nuclear fusion.
C. nuclear fission.
D. artificial disintegration.

9. An atom of chlorine has several valence electrons in its
A. first shell.
B. second shell.
C. third shell.
D. nucleus.

10. A chemical reaction in which two elements or radicals change places with two other elements or radicals is a _______ reaction.
A. decomposition
B. combination
C. substitution
D. double replacement

11. The valence of aluminum is +3, and the valence of chlorine is –1. The formula for aluminum chloride is correctly written as
A. AlCl3.
B. Al 3Cl.
C. ClAl3.
D. Cl3 Al.

12. The molecular mass of sodium oxide (Na 2 O) is
A. 22.98977.
B. 45.97954.
C. 61.97894.
D. 38.98917.

13. A salt is obtained as a reaction between
A. an acid and oxygen.
B. a base and an acid.
C. a nonmetal and a metal.
D. a base and water.

14. Which of the following is represented in the highest percentage by volume in dry air?
A. Carbon dioxide
B. Hydrogen
C. Nitrogen
D. Oxygen

15. The process of splitting an atom into two lighter atoms is called
A. nuclear fission.
B. nuclear fusion.
C. nuclear separation.
D. nuclear disintegration.

16. The factor that affects how easily an electron can be removed from an atom is the
A. temperature of the environment.
B. structure of the atom.
C. size of the atom.
D. surrounding atoms.

17. A solution that contains a large amount of salt and a small amount of water is said to be a _______ solution.
A. dilute
B. unsaturated
C. concentrated
D. saturated

18. The element fluorine is classified in the periodic table as a/an
A. alkali metal.
B. metalloid.
C. metal.
D. halogen.

19. A chemical reaction in which compounds break up into simpler constituents is a _______ reaction.
A. double replacement
B. combination
C. decomposition
D. substitution

20. _______ are atoms that carry an electric charge.
A. Nonelectrolytes
B. Ions
C. Colloids
D. Electrolytes

21. A substance that contains hydrogen that may be replaced by a metal is a/an
A. nonmetal.
B. base.
C. acid.
D. colloid.

22. Which one of the following statements about sulfuric acid is correct?
A. Sulfuric acid is a strong oxidizing agent.
B. Sulfuric acid is dangerous to living organisms.
C. Sulfuric acid is a known muriatic acid.
D. Sulfuric acid has little effect on metals.

23. Which of the following elements is stable?
A. Carbon, atomic number 6
B. Neon, atomic number 10
C. Fluorine, atomic number 9
D. Boron, atomic number 5

24. The measure of the number of atoms in one element that will combine with an atom of another element is
A. atomic charge.
B. molecular number.
C. atomic number.
D. valence.

25. The primary metallic element that's added to steel to make stainless steel is
A. silver.
B. antimony.
C. chromium.
D. tungsten.

Answer 1

1. A
2. A
3. D
4. D
5. A
6. B
7. B
8. B
9. C
10. D
11. A
12. C
13. B
14. C
15. A
16. B
17. C
18. D
19. C
20. B
21. C
22. B
23. B
24. D
25. C

Answer 2

I checked the first ten, all ok.

Answer 3

4 is C

Answer 4

Wow, that's a lot of questions