Quiz about Balancing Equations, Types of Reactions, &Endo vs Exothermic

Question 1

In an exothermic reaction, heat is ...

Accepted Answer

given out or released

Answer

taken in or absorbed

Question 2

In an endothermic reaction, heat is ...

Accepted Answer

taken in or absorbed

Answer

given out or released

Question 3

What type of reaction occurs in a hand warmer

Accepted Answer

exothermic

Answer

endothermic

Question 4

Exothermic reactions...

Accepted Answer

Release energy

Answer

Absorb energy

Answer

Release Color

Answer

Absorb Color

Question 5

If a chemical reaction is EXOTHERMIC, the temperature would....

Accepted Answer

Increase

Answer

Stay the same

Answer

Decrease

Question 6

In an endothermic reaction, heat is ...

Accepted Answer

taken in

Answer

given out

Question 7

What is law of conservation of mass ?

Accepted Answer

Mass of reactants = mass of products

Answer

mass of reactants > mass of the products

Answer

mass of the reactants < mass of the products

Answer

mass of reactants > 2 mass of the reactants

Question 8

Does this follow the law of conservation of mass:

Yes No

Accepted Answer

Yes

Answer

No

Question 9

Does this follow the law of conservation of mass:

Yes No

Na + F --> NaF

Accepted Answer

Yes

Answer

No

Question 10

The number in front of a compound or element is a

Accepted Answer

Coefficient

Answer

Subscript

Answer

Superscript

Answer

Charge

Question 11

How many nitrogen atoms does NH₃ have?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 12

How many oxygen atoms are in this chemical formula?

Accepted Answer

6 oxygen atoms

Answer

2 oxygen atoms

Answer

3 oxygen atoms

Answer

4 oxygen atoms

Question 13

What is the law of conservation of mass?

Accepted Answer

The mass of the reactants equals the mass of the products

Answer

The amount of matter changes when reacted or changed.

Answer

The mass of all reactants are changed during a physical or chemical change

Answer

The mass of the products is different than the mass of the reactants.

Question 14

Balance this equation-
__P₄+ __O₂--> __P₂O₃

Accepted Answer

1, 3, 2

Answer

it is already balanced

Answer

2, 1, 3

Answer

1, 2, 3

Question 15

Which of the following is an example of synthesis?

Accepted Answer

Na + Br₂--> NaBr

Answer

KClO₃--> KCl + O₂

Answer

HgO + Cl₂-->HgCl + O₂

Answer

Cl₂ + NaBr --> NaCl + Br₂

Question 16

If a chemical reaction is EXOTHERMIC, the temperature would....

Accepted Answer

Increase

Answer

Stay the same

Answer

Decrease

Question 17

3Ca + 2AlCl₃ --> 3CaCl₂+2Al

Accepted Answer

Single diplacement

Answer

Synthesis

Answer

Decomposition

Answer

Double displacement

Question 18

3KOH + H₃PO₄ --> K₃PO₄+3H₂O

Accepted Answer

Double displacement

Answer

Synthesis

Answer

Decomposition

Answer

Single displacement

Question 19

When balancing equations a ____ can be placed to the left of a formula of a substance to make the equations balanced

Accepted Answer

coefficient

Answer

charge

Answer

subscript

Answer

random number

Question 20

Balance this equation:
__Li + __Cl₂ -> __LiCl

Accepted Answer

2Li + Cl₂ -> 2LiCl

Answer

2Li + Cl₂ -> 4LiCl₂

Answer

2Li + Cl₂ -> LiCl₂

Question 21

The number of atoms you begin with in a chemical reaction ...

Accepted Answer

must be the same as the number of  atoms you end with

Answer

must be an even number

Answer

can be different to the number you finish with

Answer

changes depending on how much energy is formed

Question 22

_____ reactions usually feel hot!

Accepted Answer

exothermic

Answer

endothermic

Question 23

____ reactions usually feel cold.

Accepted Answer

endothermic

Answer

exothermic

Question 24

During an exothermic reaction, heat is _________ and chemical bonds __________.

Accepted Answer

released, formed

Answer

absorbed, broken

Answer

released, broken

Answer

absorbed, formed

Question 25

During an endothermic reaction, heat is ________ and chemical bonds _______.

Accepted Answer

absorbed, broken

Answer

released, formed

Answer

released, broken

Answer

absorbed, formed

Question 26

Endo means in or _______.

Accepted Answer

absorbed

Answer

released

Question 27

Exo means out or ________.

Accepted Answer

released

Answer

absorbed

Question 28

Read the following chemical formula: C₆H₁₂O₆. How many hydrogen atoms are in the formula?

Accepted Answer

12

Answer

6

Answer

4

Question 29

Balance this equation...
HgO --> 2Hg + O₂

Accepted Answer

2HgO --> 2Hg + O₂

Answer

It is balanced

Answer

2HgO --> Hg + O₂

Question 30

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

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 31

How many atoms of aluminum are on each side of the following equation: 4Al + 3O₂--> 2Al₂O₃

Accepted Answer

4

Answer

2

Answer

6

Answer

1

Question 32

Is this balanced?...
Fe + S --> FeS

Accepted Answer

YES!

Answer

NO!

Question 33

True or False: When balancing chemical equations the subscripts can change.

Accepted Answer

false

Answer

true

Question 34

This is used to represent the number of atoms of each element being represented.

Accepted Answer

The Subscript

Answer

A Exponent

Answer

The Coefficient

Answer

A Molecule

Question 35

How many hydrogen atoms are in this chemical formula:

Accepted Answer

4 hydrogen atoms

Answer

1 hydrogen atom

Answer

2 hydrogen atoms

Answer

3 hydrogen atoms

Question 36

AgF + CaCl₂ ---> AgCl + CaF₂

Accepted Answer

double replacement

Answer

decomposition

Answer

single replacement

Answer

synthesis

Question 37

How many ATOMS of Oxygen are in 3Fe₂O₃

Accepted Answer

9

Answer

2

Answer

3

Answer

6

Balancing Equations, Types of Reactions, &Endo vs Exothermic

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