1. KI Chemistry
Unit 4: Section 1 Review

2. Section 1
What are two pieces of information you can gain from looking at a chemical equation?
2Li (s) + H2O (l) → 2LiOH (s) + H2 (g)

3. Section 1
What are two pieces of information you can gain from looking at a chemical equation?
2Li (s) + H2O (l) → 2LiOH (s) + H2 (g)
The types of substances involved
The phases of the substances involved

4. What would you OBSERVE if you saw this chemical equation?
Li (s) + H2O (l) → LiOH (s) + H2 (g)

5. What would you OBSERVE if you saw this chemical equation?
Li (s) + H2O (l) → LiOH (s) + H2 (g)
You would see bubbles because of the gas produced and a solid remaining.

6. What pieces of information can you only gain from observation of a reaction only?

7. What pieces of information can you only gain from observation of a reaction only?
Color changes
Temperature change
Rate or speed of the reaction

8. You watch an experiment conducted and the solution changes color from clear to blue and a gas is emitted. Why would you need a chemical equation?

9. You watch an experiment conducted and the solution changes color from clear to blue and a gas is emitted. Why would you need a chemical equation?
In order to know what substances are reactants and what substances are produced. As well as the amounts of elements involved.

10. What is the difference between a chemical and a physical equation?

11. What is the difference between a chemical and a physical change?
Chemical – produces new products and substances
2H2(g) + O2(g) →2 H2O (l)
Physical- changes in phase
NaCl(s) → NaCl(l)

12. Label each of the following equations as chemical or physical
CaCO3 (s) → CaO (s) + Co2(g)
H2O (g) → H2O (l)
2K (s) + 2HCl (aq) → 2KCl (aq) + H2(g)

13. Label each of the following equations as chemical or physical
CaCO3 (s) → CaO (s) + Co2(g) Chemical
H2O (g) → H2O (l) Physical
2K (s) + 2HCl (aq) → 2KCl (aq) + H2(g) Chemical

14. How would you write a correct interpretation of this reaction using words.
4 Al(s) + 3O2(g) → 2Al2O3(s)

15. How would you write a correct interpretation of this reaction using words.
4 Al(s) + 3O2(g) → 2Al2O3(s)
Solid Aluminum reacts with gaseous oxygen to produce solid aluminum oxide.

16. Does the following chemical equation follow the Law of Conservation of Mass?
2 Na (s) + Cl2(g) → 2NaCl(s)

17. Does the following chemical equation follow the Law of Conservation of Mass?
2 Na (s) + Cl2(g) → 2NaCl(s)
Yes because there are the same amount of atoms before and after the reaction.
Nothing is created or destroyed.

18. What number can you change when you are trying to balance the equation?
Coefficients or Subscripts?

19. What number can you change when you are trying to balance the equation?
Coefficients or Subscripts?
Coefficients only!!!! The number in front of the compound.

20. Balancing Equations practice
______ As +______ Cl2 → _____AsCl5

21. Balancing Equations practice
______ As +______ Cl2 → _____AsCl5

22. ______NaN3 → _______Na + ______N2

23. ______NaN3 → _______Na + ______N2

24. ____SiO2 + ______C → ____Si + ______CO

25. ____SiO2 + ______C → ____Si + ______CO

26. ____ Li + ______ O2 → _____Li2O

27. ____ Li + ______ O2 → _____Li2O

28. ___Al + ____Fe3O4 → ____Fe + ____Al2O3

29. ___Al + ____Fe3O4 → ____Fe + ____Al2O3

30. ____ Li + _____N2 → _____Li3N

31. ____ Li + _____N2 → _____Li3N

32. Combination, Decomposition, Single and Double exchange
2 NaN3 → 2Na +3N2
SiO2 + 2C → Si + 2 CO
6 Li + N2 → 2 Li3N
BaCl2 + Ag(NO3) → AgCl (s) + Ba(NO3)2

33. Combination, Decomposition, Single and Double exchange
2 NaN3 → 2Na +3N2 Decomposition
SiO2 + 2C → Si + 2 CO Single Exchange
6 Li + N2 → 2 Li3N Combination
BaCl2 + Ag(NO3) → AgCl (s) + Ba(NO3)2
Double Exchange

34. PbCO3(s) is a toxin. How can this enter your body?
Explain how you got your answer.

35. PbCO3(s) is a toxin. How can this enter your body? By ingestion.
Explain how you got your answer.
Because the toxin is in the form of a solid (s)