Question 1

Consider the following balanced chemical equation: $C_3H_8{_(g_)}$ + $5 O_2{_(g_)}$ → $3 CO_2{_(g_)}$ + $4 H_2O{_(l_)}$ The “$_8$” in the equation is an example of a ___________________.

Accepted Answer

subscript

Answer

product

Answer

reactant

Answer

coefficient

Question 2

Consider the following balanced chemical equation: $C_3H_8{_(g_)}$ + $5 O_2{_(g_)}$ → $3 CO_2{_(g_)}$ + $4 H_2O{_(l_)}$ The “5” in the equation is an example of a ___________________.

Accepted Answer

coefficient

Answer

subscript

Answer

reactant

Answer

product

Question 3

Consider the following balanced chemical equation: $C_3H_8{_(g_)}$ + $5 O_2{_(g_)}$ → $3 CO_2{_(g_)}$ + $4 H_2O{_(l_)}$ The product(s) of the reaction are ___________________.

Accepted Answer

$CO_2{_(g_)}$ and $H_2O{_(l_)}$

Answer

$H_2O{_(l_)}$ and $O_2{_(g_)}$

Answer

$C_3H_8{_(g_)}$ and $O_2{_(g_)}$

Answer

$C_3H_8{_(g_)}$ and $CO_2{_(g_)}$

Question 4

Consider the following balanced chemical equation: $C_3H_8{_(g_)}$ + $5 O_2{_(g_)}$ → $3 CO_2{_(g_)}$ + $4 H_2O{_(l_)}$ The liquid in the equation is _________________.

Accepted Answer

$H_2O$

Answer

$C_3H_8$

Answer

$CO_2$

Answer

$O_2$

Question 5

Which equation is considered balanced?

Accepted Answer

$2H_2$ + $O_2$ → $2H_2O$

Answer

$H_2$ + $O_2$ → $H_2O$

Answer

$4H_2$ + $O_2$ → $4H_2O$

Answer

$2H_2$ + $2O_2$ → $2H_2O$

Question 6

What are the products in a combustion reaction?

Accepted Answer

carbon dioxide and water

Answer

fire and smoke

Answer

oxygen and carbon

Answer

carbon monoxide

Question 7

True or False: In a chemical reaction, matter is neither created nor destroyed.

Accepted Answer

True

Answer

.

Answer

.

Answer

False

Question 8

Which observation does NOT mean a chemical reaction has occurred?

Accepted Answer

a solid melting

Answer

a precipitate is formed

Answer

there is a temperature change

Answer

there is a color change

Question 9

Which equation shows the reaction between Zinc and Copper Sulfate?

Accepted Answer

$Zn$ + $CuSO_4$  → $ZnSO_4$ + $Cu$

Answer

$ZnSO_2$ + $Cu$ → $Zn$ + $CuSO_2$

Answer

$Zn$ + $Co_2SO_4$  → $ZnSO_4$ + $2Co$

Answer

$Zn$ + $Cu$ + $S$ + $O_2$  → $ZnSO_4$ + $Cu$

Question 10

How many copper atoms are in 1 mole?

Accepted Answer

$6.02 x 10^{23}$

Answer

1

Answer

$23 x 10^6$

Answer

$63.55 $

Question 11

Given the equation: $2Na$ + $Cl_2$ → $2NaCl$ How many moles of sodium chloride are created from 1 mole of chlorine?

Accepted Answer

2

Answer

4

Answer

1

Answer

1/2

Question 12

For the following reaction: $2KClO_3$ → $2KCl$ + $3O_2$, what is the molar ratio of potassium chlorate to oxygen?

Accepted Answer

2:3

Answer

3:2

Answer

1:1

Answer

2:1

Question 13

What is the definition of percent yield?

Accepted Answer

actual yield / theoretical yield x 100

Answer

amount of limiting reactant x amount of products / 100

Answer

mass x volume x 100

Answer

theoretical yield / actual yield x 100

Question 14

A limiting reactant is __________________.

Accepted Answer

the reactant which is totally consumed when the chemical reaction is complete.

Answer

the reactant in a chemical reaction that remains when a reaction stops.

Answer

present in excess.

Answer

the amount of product that is formed.

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