1. Unit 5 Test Review

2. What is the Law of Conservation of Mass?
In any reaction mass is conserved
Mass of reactants = mass of products

3. Describe fusion
2 or more nuclei combine to form a larger nuclei

4. Describe fission
nuclei split into fragments when struck by neutrons

5. The reactants and products of complete combustion of a hydrocarbon CxHx would include
H2O
CO2 O2

6. The reactants and products of a decomposition reaction would include
A single reactant that is an ionic or molecular compoound
Have multiple products

7. What type of reaction occurs when magnesium reacts with aluminum chloride?
Single replacement

8. The reactants and products of a synthesis reaction would include
Multiple reactants and a single product

9. The reactants and products of a single replacement reaction would include
A single element and a compound

10. What will happen to the rate of reaction if you increase the concentration of the reactants?
It will increase

11. What will happen to the rate of reaction if you increase the temperature?
The rate will increase

12. What is activation energy?
The amount of energy needed for a reaction to occur

13. What is a catalyst?
A substance that when added to a reaction, will increase the rate of the reaction without being used up

14. What are enzymes?
Proteins in the body that act as catalysts for biological processes

15. What is a limiting reactant?
When there are more than 1 reactants -
the one that gets used up first and limits that amount of product possible

16. Identify the parts of a reaction
Coefficient
Reactant
Separates reactants or products
seperates reactants from products
Tells the state of the substance
product

17. What is an endothermic reaction?
A reaction in which energy is absorbed

18. What is an exothermic reaction?
A reaction in which energy is released

19. Identify the following reaction as: synthesis, decomposition, single-displacement, double displacement, or combustion
NaNO3 (s)  NaNO2 (s) + O2 (g)
decomposition

20. Identify the following reaction as: synthesis, decomposition, single-displacement, double displacement, or combustion
FeS (s) + HCl (aq)  FeCl2 (aq) + H2S (g)
double displacement

21. Identify the following reaction as: synthesis, decomposition, single-displacement, double displacement, or combustion
CO (g) + O2 (g)  CO2 (g) + H2O (g)
combustion

22. Identify the following reaction as: synthesis, decomposition, single-displacement, double displacement, or combustion
Al (s) + S (s)  Al2S3 (s)
synthesis

23. Identify the following reaction as: synthesis, decomposition, single-displacement, double displacement, or combustion
KI (aq) + Cl2 (g)  KCl (aq) +I2 (aq)
single displacement

24. Write a balanced chemical equation for the following reaction
sodium metal will combine with oxygen in dry air to form solid sodium oxide 4Na (s) + O2 (g)  2Na2O (s)

25. Balance the following equation
AlCl3 (aq) + NaOH (aq)  NaCl3 (aq) + AlOH (s)

26. 2Ca (s) + 2H2O (l)  2CaOH2 (aq)
Balance the following equation
Ca (s) + 2H2O (l)  CaOH2 (aq)
2Ca (s) + 2H2O (l)  2CaOH2 (aq)

27. What are the reactants in a double replacement reaction?
2 ionic compounds

28. In the equation 2K (s) + 2H2O (l)  2KOH (aq) + H2 (g), what is the physical state of each reactant and product?
reactants products K – solid KOH – aqueous solution H2O – liquid H2 - gas

29. Write a balanced chemical equation for the following reaction aluminum metal + hydrochloric acid aluminum chloride solution + hydrogen
2Al + 6HCl AlCl3 + 3H2

30. Chem I - done
Chem I honors continue

31. Determine the oxidation numbers of all elements of the following substances Al
= 0

32. Determine the oxidation numbers of all elements of the following substances Ca2+
= +2

33. Determine the oxidation numbers of all elements of the following substances PO42-

34. Determine the oxidation numbers of all elements of the following substances C2H6O

35. For the following redox reaction determine the element that is oxidized, reduced, the oxidizing agent, and the reducing agent H2C2O4 + K2MnO4  CO2 + K2O + Mn2O3 + H2O
C - +3  +4 = lose 1 e- = oxidized, reducing agent
Mn +6  +3 = gain 3 e- = reduced, oxidizing agent