Exploring Creation Chemistry Module #6 Test
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01. What is a stoichiometric coefficient?
02. What numbers should be in the blank:
In the equation
2HF + CaO
2
H
2
--> 2H
2
O + CaF
2
2 moles of HF react with _______ mole(s) of CaO
2
H
2
to make ______ moles(s) of H
2
O and ______ moles(s) of CaF
2
.
03. The chemical reaction in problem #2 is run with HF as the limiting reactant. What would happen to the amount of H
2
O produced in the reaction if the number of moles of CaO
2
H
2
were doubled but the number of mole of HF were kept the same?
04. State Gay-Lussac's Law and its limitations.
05. An unknown compound is decomposed into 6.9 g of Na, 3.1 g of P and 6.4 g of oxygen. What is its empirical formula?
06. One type of stomach antacid, Al(OH)
3
can be made in the following way:
Al
2
(SO4)
3
+ 6NaOH --> 2Al(OH)
3
+ 3Na
2
SO
4
How many moles of Al(OH)
3
can be made with 2.3 moles of NaOH and excess Al
2
(SO4)
3
?
07. AgBr, another chemical used in photography, can be made with this reaction:
2AgNO
3
+ CaBr
2
-->2AgBr + CaN
2
O
6
AgNO
3
is very expensive, so in making AgBr, you want to be sure this reactant is all used up. If a chemist starts with 15.0 g of AgNO
3
, how many grams of CaBr
2
must be added to use up all of the AgNO
3
?
08. Is Al
2
Cl
6
an empirical formula? If not, convert it to an empirical formula.
09. A chemist performs the following reaction:
6ClO
2
(g) + 3H
2
O (l) --> 5HClO
3
(l) + HCl (g)
If the chemist wants to make 50.0 g of HClO
3
, what is the minimum number of grams of ClO
2
that she can use?
10. If the reaction in problem 9 was run with excess water, how many liters of HCl would be produced from 10.0 liters of ClO
2
?
11. Why is the following problem unsolvable?
If the reaction in problem 9 was run with excess water, how many liters of HClO
3
would be produced from 10 liters of ClO
2
?
12. A compound has an empirical formula of CH
2
and a molecular mass of 70.1 amu. What is its molecular formula?
13. What is wrong with the following statement?
In the reaction
N
2
+ 3H
2
--> 2NH
3
1 gram of N
2
reacts with 3 grams of H
2
to make 2 grams of NH
3
14. Consider the following reaction:
Fe
2
O
3
(s) + 3CO (g) --> 2Fe (s) + 3 CO
2
(g)
If 2 moles of Fe
2
O
3
are reacted with 3 moles CO, what is the limiting reactant?
15. With the reaction and quantities given in problem 14, how many moles of Fe would be formed?