Chemistry Self-Test.

You can use this Self-Test to see whether you understood the concepts covered in the Chemistry Tutorial. You should get ALL of the questions correct.

Make sure you read each question carefully and take your time in answering. Don't just guess. This is a test for YOU. If you don't do well on this test, you do not understand the material you covered in the Tutorial. - Go back and do it again.

1. The correct formula for Calcium Bromide is:
CaBr3
Ca2Br
CaBr
CaBr2
  

2. An imaginary element with an Atomic Number of 10 and a Mass Number of 11 has:
10 Protons
11 Protons
11 Neutrons
1 Electron
  

3. An element with 9 electrons would have a valency of:
+ 9
+1
- 1
- 9
  

4. In a normal atom the number of Protons equals the number of:
Neutrons
Electrons
ions
valency
  

5. Which of the following sets of ions contains at least one error:
Ca ++, Na +
O --, Cl -, K +
P +++++, Li +
Mg ++, I +
  

6. The formula for Calcium Bicarbonate is Ca(HCO3)2. From the formula we can say that one molecule of Calcium Carbonate has:
2 atoms of Oxygen
2 atoms of Calcium
6 atoms of Carbon
2 atoms of Hydrogen
  

7. The formula for an imaginary substance is: Xr3(Pi2Ze4)2. From the formula we can say that the radical Pi2Ze4 has a valency of:
- 1
- 2
- 3
+ 4
  

8. The correct balanced equation for Lithium reacting with water to produce Lithium Hydroxide and Hydrogen gas is:
Li + 2H2O arrow.gif (871 bytes)  LiOH2 + H2
2Li + 4H2O arrow.gif (871 bytes)  Li2(OH)2 + 2H2
Li + H2O arrow.gif (871 bytes)  LiOH + H2
2Li + 2H2O arrow.gif (871 bytes)  2Li(OH)2 + H2
  

9. The letters A, B, C,D and E represent numbers used to balance the following equation.

A K2CO3 + B HNO3  arrow.gif (871 bytes) C KNO3 + D H2O + E CO2

The letters A, B, C, D and E represent the numbers:
1, 1, 1, 1, 1
1, 2, 1, 1, 2
1, 2, 1, 1, 2
1, 2, 2, 1, 1
  

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