Quiz about Chemical Reactions

Question 1

tells us the number of atoms of each element in a compound

Accepted Answer

Chemical Formula

Answer

Coeffecient

Answer

Exponent

Answer

Calculator

Question 2

A chemical change is different than a physical change because in a chemical change

Accepted Answer

a new substance is formed and in a physical no new substance is formed

Answer

chemicals are used

Answer

molecules do not physically touch

Answer

the change can be seen but in a physical change it cannot

Question 3

True or False
In a chemical reaction, no new atoms are created, and no atoms are destroyed.

Accepted Answer

true

Answer

false

Question 4

The right side of the equation below is called the

Accepted Answer

products

Answer

reactants

Question 5

The left side of the equation below is called

Accepted Answer

Reactants

Answer

Products

Question 6

a substance formed when two or more elements are chemically bonded together

Accepted Answer

Compound

Answer

Element Soup

Answer

Pure Element

Answer

Ion

Question 7

the symbolic representation of a chemical reaction

Accepted Answer

Chemical Equation

Answer

Long Hand

Answer

Short Hand

Answer

Electron Configuration

Question 8

The Law of Conservation of Mass states

Accepted Answer

that matter cannot be created or destroyed and that the mass of the products must equal the mass of the reactants

Answer

that matter exists in all states and reacts the same

Answer

that matter can only be changed into new substances by introducing a catalyst

Answer

that matter exists in the same state throughout any chemical change

Question 9

How many Al atoms are in this compound? 4Al₂O₃

Accepted Answer

8

Answer

2

Answer

6

Answer

4

Question 10

How many F atoms are in this compound?
6MgF₂

Accepted Answer

12

Answer

2

Answer

6

Answer

8

Question 11

a copper penny turning greenish after a few years.

Accepted Answer

Chemical Change

Answer

Physical Change

Question 12

An gel ice pack getting cold after you put it in the freezer for an hour.

Accepted Answer

Physical Change

Answer

Chemical Change

Question 13

Which is the name of the kind of solid substance formed in this figure?

Accepted Answer

precipitate

Answer

aqueous

Answer

acid

Answer

synthesis

Question 14

Describes the number of molecules in a compound and is used to balance a chemical reaction.

Accepted Answer

coefficient

Answer

subscript

Answer

superscript

Answer

SI unit

Question 15

Describes the number of atoms in a compound of each element.

Accepted Answer

subscript

Answer

coefficient

Answer

superscript

Answer

SI unit

Question 16

What are the correct coefficients when this equation is balanced?
KClO₃ --> KCl + O₂

Accepted Answer

2,2,3

Answer

2,2,2

Answer

1,2,3

Answer

3,3,3

Question 17

When a scientist mixed two chemicals, an exothermic reaction takes place. Which of the following would be proof that the reaction was exothermic?

Accepted Answer

a temperature increase

Answer

a change of color

Answer

a change of state

Answer

a temperature decrease

Question 18

Which of the following is a chemical change?

Accepted Answer

gasoline burns in a car engine

Answer

water freezes to form ice

Answer

sugar dissolves in water

Answer

a piece of metal expands when it is heated

Question 19

In the reaction methane + oxygen turns into carbon dioxide + water, the methane and oxygen are called _______________.

Accepted Answer

reactants

Answer

products

Answer

neutrals

Answer

energizers

Question 20

What is the arrow in a chemical equation...
H_{2 +}O --> H₂O

Accepted Answer

Yields

Answer

Reactants

Answer

Products

Answer

Chemical Equation

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