|Are You Ready? Page 76
||a) single displacement reaction
|b) double displacement reaction
|c) combustion reaction
|d) synthesis reaction
||magnesium + hydrochloric acid --> magnesium
chloride + hydrogen
||a) 2 Na(s) + F2(g)
---> 2 NaF(s)
|b) 16 Al(s) + 3 S8(s) --->
|c) 7 CO2(g) + 14 H2(g)
----> C7H14(l) + 7 H2O(l)
||a) Ca(s) + 2 H2O(l)
-----> Ca(OH)2(s) + H2(g)
|b) Pb(NO3)2(aq) +
2 KI(aq) -----> PbI2(ppt) + 2
||symbol 1 = Class D: Toxic Materials - Immediate
symbol 2 = Class B: Flammable and Combustible Materials
symbol 3 = Class F: Dangerously Reactive Materials
symbol 4 = Class C: Oxidizing Materials
||a) A dark red precipitate forms as the contents
of flask A are added to the contents of flask B.
|b) 317.26 g
|c) The student is trying to test the law
of conservation of mass in a chemical reaction.
|d) The total mass of the products could
appear to be less than the total mass of reactants if some of the solution
in flask A spilled or splattered when it was added to the solution in flask
B in part 3. The product mass could also appear to be less if flask
B in part 4 was left open for a period of time before its mass was measured.
In this case, some of the liquid in the flask might evaporate.
||a) 9/y = 3/2
y = 9* (2/3)
y = 18/3
y = 6
The value of y is 6.
|b) % girls = 657/1093 X 100%
% girls = 60.1%
|c) 7.38 X 107 g/mL