MST HOMEWORK - WEEK 5
SCIENCE EXAM REVISION -->
CHEMICAL REACTIONS
1. What is an element? Give an example.
2. What is a compound? Give an example
3. How many elements are there?
4. What are groups of elements?
5. What are periods of elements?
6. What are lewis dot diagrams?
7. How do Lewis dot diagrams describe properties of groups of elements?
8. What are valence electrons?
9. What is an octet of electrons?
10. How many valence electrons are possible?
11. What are endothermic / exothermic reactions?
12. Why are reactions either exo / endothermic?
13. What are the six types of reactions?
14. How are double displacement / acid base reactions similar?
15. Classify the reaction type and predict the products of the following reaction:
N2 + H2 ---->
16. Classifying and balancing reactions:
MST HOMEWORK - WEEK 5
9) ____ H2SO4 + ____ NH4OH  ____ H2O + ____ (NH4)2SO4
Type of reaction: ____________________
17. Classify these reactions as endothermic or exothermic:
Sunlight + 6CO2 (g) + 6H2O (l) --> C6H12O6 (aq) + 6O2 (g)
CaCO3 (s) ---->CaO (s) +CO2 (g) + energy
18. Identify the following parts of a chemical reaction:
_____ CO2 (g) + _____ H2O (l) -->_____ C6H12O6 (s) + _____ O2 (s)
MST HOMEWORK - WEEK 5
A) reactants
B) Products
C) Yields sign
D) (s) (l) (g) (aq)
19. (A) Balance the following equations:
MST HOMEWORK - WEEK 5
19 (b) what is the word equation for these reactions (above - match the correct chemical word equations)
Aluminum sulfate + Calcium hydroxide --> Aluminum hydroxide + Calcium sulfate
Tetraphosphorus decoxide + Water --> Hydrogen phosphate
Sodium peroxide + Water --> Sodium hydroxide + oxygen
Potassium chlorate --> Potassium perchlorate + Potassium chloride
Potassium oxide + Water --> Potassium hydroxide
Silicon dioxide + Hydrogen fluoride --> Silicon tetrafluoride + Water
Lithium oxide + Water --> Lithium hydroxide
Ammonium nitrate --> Dinitrogen monoxide + water
Carbon + water --> Carbon monoxide + Hydrogen
Dicarbon dihydride + Oxygen --> Carbon dioxide + Water
Lead II nitrate --> Lead II oxide + Nitrogen dioxide + Oxygen
Iron III chloride + Ammonium hydroxide --> Iron III hydroxide + Ammonium chloride
Antimony + Oxygen --> Tetrantimony Hexoxide
Tricarbon octahydride + Oxygen --> Carbon dioxide + water
Hydrogen peroxide --> Water + Oxygen
Nitrogen trihydride + Nitrogen monoxide --> Nitrogen + Water
Phosphate Magnesium + Nitrogen --> Magnesium nitride
Iron + Water --> Iron III oxide + Hydrogen
Dinitrogen pentoxide + Water --> Hydrogen nitrate
Sodium hydroxide + Chlorine --> Sodium chloride + Sodium hypochlorite + water
Aluminum + Hydrogen chloride --> Aluminum chloride + Hydrogen
Aluminum + Oxygen --> Aluminum oxide
Potassium chlorate --> Potassium chloride + Oxygen
Phosphorus pentachloride + water --> Hydrogen chloride + Hydrogen
Calcium chlorate --> Calcium chloride + Oxygen
20. What is pH?
21. Solutions above pH 7 are.....
MST HOMEWORK - WEEK 5
22. Solutions below pH 7 are.....
23. Solutions at pH 7 are.....
24. What color does litmus paper turn in the presence of an acid?
25. What color does litmus paper turn in the presence of a base?
(I) WRITE THE NAMES FOR THE CHEMICAL FORMULAS AND / OR WRITE OUT THE
SYMBOLS WITH THE APPROPRIATE ION CHARGES
(II) BALANCE THE SKELETON EQUATIONS.
(III) INDICATE THE TYPE OF REACTION
BaO2 → 2BaO + O2
H2S + O2 → SO2 + H2O
C3H6 + O2 --> CO2 +
6H2O