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Chemistry: Chapter 12 Flashcards | StudBud
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Chemistry: Chapter 12
Chemistry: Chapter 12
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A #chemistry quiz!
Flashcards
20 cards
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Questions
20
Answers
1
In a chemical reaction the chemicals that you start with are called the
reactants
products
elements
catalysts
2
When balancing the following equation what coefficients are needed? CH
4
+ O
2
---> CO
2
+ H
2
O
1, 2, 1, 2
4, 3, 2, 1
1, 2, 3, 4
1, 1, 1, 1
3
4 Moles of Calcium Chloride would equal how many grams?
623 g
125 g
440 g
75 g
4
If 25 g of Na react with 25 grams of Cl
2
, what is the limiting reactant?
the Cl2
the Na
5
When 40 g of magnesium oxide decomposes, how many moles are decomposing?
3 moles
0.5 moles
2 moles
1 mole
6
Convert 75 g of Calcium Carbonate to moles.
2 moles
0.5 moles
0.75 moles
1 mole
7
In the following equation, what is the mole ratio if H
2
O is the unknown and CH
4
is the given? CH
4
+ O
2
---> CO
2
+ H
2
O
2/1
1/1
2/2
1/2
8
In the decomposition of magnesium oxide, what is the mole ratio of oxygen to magnesium?
1/2
1/1
2/2
2/1
9
In the synthesis of Magnesium Oxide, what is the mole ratio of Magnesium to Magnesium Oxide?
2:1
2:3
2:2
1:2
10
What is the second step in solving a stoichiometry problem?
multiply by the mole ratio
determine the mole ratio
balance the equation
change the given information to moles
11
If 25 g of hydrogen gas reacts with 25 g of oxygen gas to produce water what is the limiting reactant?
There is no limiting reactant
Oxygen
Water
Hydrogen
12
What is the first step in solving any stoichiometry problem?
convert to the desired units
balance the equation
change the given information to moles
determine the mole ratio
13
In the equation Mg(s) + O
2
(g) ---> MgO(s), the oxygen is a
product
reactant
liquid
solid
14
What is the fourth step in solving a stoichiometry problem?
multiply the moles by the mole ratio
balance the equation
change the given information to moles
determine the mole ratio
15
If 125 g of a product forms when stoichiometry predicts 135 g, what is the percentage yield?
72.99%
92.6%
83%
89%
16
What is the third step in solving a stoichiometry problem?
change the given information to moles
determine the mole ratio
balance the equation
convert to the desired units
17
What is the final step in solving a stoichiometry problem?
determine the mole ratio
multiply by the mole ratio
convert to the desired units
balance the equation
18
What is the coefficient on the magnesium in the decomposition of magnesium oxide?
2
3
1
4
19
When information is given about more than one reactant, the limiting reactant is the one that
has more moles
has more grams
has less grams
has less moles
20
Stoichiometry is the branch of Chemistry that deals with
chemical formulas
mathematical relationships in Chemistry
protons, neutrons, and electrons
the history of the Periodic Table
