10 minutes maximum! Can you do it in 5? |
- Select the row which shows the correct charges on the ions formed by the metals in groups 1 and 2 and the non-metals in groups 6 and 7:
| |
Group 1 |
Group 2 |
Group 6 |
Group 7 |
| A |
1+ |
2+ |
6+ |
7+ |
| B |
1- |
2- |
2+ |
1+ |
| C |
1+ |
2+ |
2- |
1- |
| D |
7- |
6- |
2- |
1- |
| |
2. Select the row showing the correct formulae for the compound ions:
| |
hydroxide |
carbonate |
sulfate |
nitrate |
| A |
OH- |
CO32- |
SO42- |
NO3- |
| B |
OH- |
CO32- |
SO42- |
NO32- |
| C |
OH2- |
CO3- |
SO4- |
NO3- |
| D |
OH2- |
CO3- |
SO32- |
NO3- |
| |
Q3-5: Which is the correct formula for each of the following compounds? |
|
3. Calcium chloride
- A. CaCl
- B. CaCl2
- C. Ca2Cl
- D. Ca7Cl2
| |
4. Sodium carbonate
- A. Na3CO
- B. NaCO3
- C. Na(CO3)2
- D. Na2CO3
| |
5. Lead(II)hydroxide
- A. PbOH
- B. Pb2OH
- C. Pb(OH)2
- D. PbOH2
| |
6. In neutralization reactions the ions produced by acids join with the ion produced by alkalis. Which of these answers correctly identifies there ions?
| |
ion from acids |
ion from alkalis |
| A |
OH- |
H+ |
| B |
OH2- |
H2+ |
| C |
H+ |
OH- |
| D |
H+ |
OH2- |
|
|
| 7. Marble chips react with dilute hydrochloric acid as follows:
CaCO3 (...) + 2HCl (...) → CaCl2 (…) + H2O (…) + CO2 (…) |
The correct state symbols required to complete this equation are:
- A. CaCO3 (s) + 2HCl (aq) → CaCl2 (aq) + H2O (l) + CO2 (g)
- B. CaCO3 (s) + 2HCl (aq) → CaCl2 (l) + H2O (l) + CO2 (g)
- C. CaCO3 (s) + 2HCl (l) → CaCl2 (l) + H2O (l) + CO2 (g)
- D. CaCO3 (s) + 2HCl (l) → CaCl2 (aq) + H2O (aq) + CO2 (g)
| |
Q8-10. Balance the following chemical equations:
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