Quiz about Chemical Equations

Question 1

What does the Law of Conservation of Mass state?

Accepted Answer

Matter cannot be gained or lost in a chemical reaction.

Answer

Matter can only be lost in a chemical reaction.

Answer

Matter can only be gained in a chemical reaction.

Answer

Matter can be gained and lost in a chemical reaction.

Question 2

What is the left part of a chemical equation called?
2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Reactants

Answer

Products

Answer

Yields

Answer

Chemical Equation

Question 3

What is the right part of a chemical equation called...
2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Products

Answer

Reactants

Answer

Yields

Answer

Chemical Equation

Question 4

What is the right part of a chemical equation called...
2H_{2 +}O₂ --> 2H₂O

Accepted Answer

Products

Answer

Reactants

Answer

Yields

Answer

Chemical Equation

Question 5

What is the little number after an element in a chemical equation called.
Example: H₂

Accepted Answer

Subscript

Answer

Coefficient

Answer

Atom

Answer

Equation

Question 6

Is the following equation balanced?...
Al + O₂ --> 2Al₂O₃

Accepted Answer

No!

Answer

Yes!

Question 7

How many elements are in C₆H₁₂O₆?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 8

What are the larger numbers that you CAN CHANGE in a chemical equation?

Accepted Answer

Coefficient

Answer

Products

Answer

Reactants

Answer

Subscripts

Question 9

How many HCl molecules do you need to balance this equation?
Mg + __HCl ---> MgCl₂ + H₂

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 10

What is the part of the chemical equation in green called?
Fe + S --> FeS

Accepted Answer

reactants

Answer

products

Answer

yield

Answer

chemical formula

Question 11

What coefficient should be used to make the following equation balanced?
N₂+O₂--> _NO

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 12

What is the purpose of balancing a chemical equation?

Accepted Answer

To ensure that the law of conservation of mass is obeyed

Answer

To increase the reaction rate

Answer

To change the chemical properties

Answer

To create new elements

Question 13

In a balanced chemical equation, what must be equal on both sides?

Accepted Answer

Number of atoms of each element

Answer

Number of molecules on each side

Answer

Total mass on each side

Answer

Number of protons on each side

Question 14

Balance the chemical equation: H2 + O2 -> H2O

Accepted Answer

2H2 + O2 -> 2H2O

Answer

H2 + O2 -> H2O2

Answer

2H2O -> H2 + O2

Answer

H2O2 -> H2 + O2

Question 15

Balance the chemical equation: Mg + HCl -> MgCl2 + H2

Accepted Answer

Mg + 2HCl -> MgCl2 + H2

Answer

Mg + HCl -> MgCl2 + H2

Answer

Mg + HCl -> MgCl + H2

Answer

Mg + 2HCl -> MgCl + H2

Question 16

Balance the chemical equation: Na + Cl2 -> NaCl

Accepted Answer

Na + Cl2 -> 2NaCl

Answer

Na + Cl2 -> Na2Cl2

Answer

Na + Cl2 -> Na2Cl

Answer

Na + Cl2 -> NaCl2

Question 17

Balance the chemical equation: C3H8 + O2 -> CO2 + H2O

Accepted Answer

C3H8 + 5O2 -> 3CO2 + 4H2O

Answer

C3H8 + 5O2 -> 2CO2 + 4H2O

Answer

C3H8 + 6O2 -> 3CO2 + 4H2O

Answer

C3H8 + 4O2 -> 3CO2 + 4H2O

Question 18

Balance the chemical equation: N2 + H2 -> NH3

Accepted Answer

N2 + 3H2 -> 2NH3

Answer

N2 + 4H2 -> 3NH3

Answer

N2 + 2H2 -> NH3

Answer

N2 + H2 -> NH2

Question 19

Balance the chemical equation: Al + O2 -> Al2O3

Accepted Answer

Al + O2 -> 2Al2O3

Answer

Al + O2 -> AlO2

Answer

Al + O2 -> AlO3

Answer

Al + O2 -> Al3O2

Question 20

Balance the chemical equation: Fe + O2 -> Fe2O3

Accepted Answer

Fe + O2 -> Fe2O3

Answer

4Fe + 3O2 -> 2Fe2O3

Answer

FeO + O2 -> Fe2O3

Answer

Fe2O2 -> Fe2O3

Question 21

Which of the following equations are correctly balanced?

Accepted Answer

6CO₂ + 6H₂O --> C₆H₁₂O₆ + 6O₂

Answer

12CO₂ +H₂O --> C₆H₁₂O₆ + O₂

Answer

CO₂ + 9H₂O --> C₆H₁₂O₆ + O₂

Answer

CO₂ + H₂O --> 3C₆H₁₂O₆ + O₂

Question 22

What is wrong with how this student balanced the equation?

Original equation: Ag + O_{2 --->}Ag₂O

Solution: Ag + O_{2 --->}2Ag₂O

Accepted Answer

The silver (Ag) still isn't balanced.

Answer

They changed the molecular structure of the products/reactants.

Answer

The oxygen (O) still isn't balanced.

Answer

They left out the reactants.

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