AnswersChemistryChemical Reactions

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Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction?

A
sodium plus water rightarrow sodium hydroxide plus hydrogen
B
sodium hydroxide plus water rightarrow sodium plus hydrogen
C
sodium plus hydrogen rightarrow sodium hydroxide plus water
D
sodium plus sodium hydroxide rightarrow water plus hydrogen
3

Which definition describes activation energy?

A
the speed at which reactants form products in a chemical reaction
B
the minimum energy that a set of reactants must attain before reaction can occur
C
the short-lived, high-energy intermediate between reactants and products
D
the diagram showing a change in energy between reactants and products
4

What is the percent by mass of water in Na2SO4⋅10⁢H2O? Use percent Element is equal to total mass of element in compound over molar mass of compound times 100

A
11 point 2 6 percent
B
5 point 5 9 percent
C
55 point 9 2 percent
D
44 point 0 8 percent
5

What else is produced during the replacement reaction of magnesium and hydrochloric acid? Mg plus 2 HCl rightarrow cap h sub 2 plus ______

A
MgCl
B
Mg sub 2 Cl sub 2
C
MgCl sub 2
D
Mg sub 2 Cl
6

The balanced equation shows how sodium chloride reacts with silver nitrate to form sodium nitrate and silver chloride. NaCl plus AgNO sub 3 rightarrow NaNO sub 3 plus AgCl If 4 point 0 0 g of NaCl react with 10 point 0 0 g of AgNO sub 3 , what is the excess reactant?

A
NaNO sub 3
B
NaCl
C
AgNO sub 3
D
AgCl
7

What is the empirical formula for propene open paren cap c sub 3 cap h sub 6 close paren ?

A
cap c sub 4 cap h sub 8
B
cap c cap h sub 2
C
cap c sub 3 cap h sub 6
D
cap c sub 2 cap h sub 4
8

The equation represents the combustion of sucrose. cap c sub 12 cap h sub 22 cap o sub 11 plus 12 cap o sub 2 rightarrow 12 CO sub 2 plus 11 cap h sub 2 cap o If there are 10 point 0 g of sucrose and 8 point 0 g of oxygen, how many moles of sucrose are available for this reaction?

A
3 point 0 0 mol
B
0 point 0 2 9 mol
C
0 point 2 5 0 mol
D
0 point 3 5 1 mol
9

This formula equation is unbalanced. BaCl sub 2 times aq plus Na sub 2 CO sub 3 aq rightarrow BaCO sub 3 times s plus NaCl times aq Which coefficient should be placed in front of NaCl to balance this equation?

A
1
B
2
C
3
D
4
10

What is the main reason that it takes 2 to 3 minutes for the reaction to occur between sucrose and sulfuric acid in the dehydration of sucrose?

A
The sulfuric acid has to be consumed before the reaction takes place.
B
The sucrose molecules must rearrange to become the catalyst.
C
The activation energy must be removed from the intermediates.
D
The activation energy needs to be overcome in the reaction.

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Practice Test Answers — Chemistry