Quiz about Chemical Reactions and Matter

Question 1

Physical or Chemical Change?

Accepted Answer

Physical

Answer

Chemical

Question 2

Physical or Chemical Change?

Accepted Answer

Chemical

Answer

Physical

Question 3

Physical or Chemical Change?

Accepted Answer

Chemical

Answer

Physical

Question 4

Physical or Chemical Change?

Accepted Answer

Physical

Answer

Chemical

Question 5

What does the Law of Conservation of Mass state?

Accepted Answer

Matter is not created or destroyed in any chemical or physical change.

Answer

Chemical and physical changes can create or destroy matter but not at the same time.

Answer

Matter can be created in chemical changes only.

Answer

Mixtures combined create new matter.

Question 6

What happened to the atoms in a piece of wood that was burned?

Accepted Answer

They are bonded differently, but all of the atoms are still there.

Answer

They are bonded differently, but some of the atoms were burned and destroyed in the fire.

Answer

All of the atoms were destroyed in the fire.

Answer

The atoms in the wood moved really fast and then stopped moving forever.

Question 7

A student placed the fruit in a tightly sealed bag and found the mass of the fruit every week for seven weeks. If the apple had a mass of 102 grams in week 1 (first picture), what would the mass of the apple be in week 7 (last picture)?

Accepted Answer

102 g

Answer

95 g

Answer

714 g

Answer

109 g

Question 8

An Alka-Seltzer tablet, which has a mass of 16 grams, is put in 160 grams of a solution. A chemical reaction takes place and a gas is produced. The final mass of the mixture is 170. What is the mass of the gas released?

Accepted Answer

6 g

Answer

16 g

Answer

160 g

Answer

170 g

Question 9

In physical or chemical reactions, atoms are NOT created or destroyed, they are only __________ to form new substances.

Accepted Answer

rearranged

Answer

missing

Answer

sad

Answer

added

Question 10

What are the three ways the Periodic Table is organized?

Accepted Answer

Families

Groups

Periods

Answer

Families

Groups

Shells

Answer

Groups

Periods

Shells

Answer

None of them

Question 11

Metals, Nonmetals, or Semimetals?

Many are gases, have low boiling and melting points, poor conductors of heat and electricity

Accepted Answer

Nonmetals

Answer

Metals

Answer

Semimetals

Answer

Lanthanides

Question 12

Metals, Nonmetals, or Semimetals?

Usually solid and shiny, Have high boiling and melting points, Good conductors of heat and electricity, Malleable and ductile (hammered into sheets and pulled into wires)

Accepted Answer

Metals

Answer

Nonmetals

Answer

Semimetals

Answer

Actinides

Question 13

Which picture represents a compound?

Accepted Answer

C

Answer

A

Answer

B

Answer

D

Question 14

What is the difference between a compound and a mixture?

Accepted Answer

Compounds are chemically bonded

Answer

Mixtures are chemically bonded

Answer

Compounds are impure substances

Answer

Mixtures are pure substances

Question 15

burning candle is an example of...

Accepted Answer

Both - Physical and Chemical

Answer

Physical Change

Answer

Chemical Change

Answer

None of them

Question 16

A substance that is formed as the result of a chemical reaction is a __________________

Accepted Answer

product

Answer

Reactant

Answer

Starters

Answer

Enders

Question 17

Which one shows that a chemical reaction has occurred?

Accepted Answer

Formation of gas

Answer

Dissolving

Answer

Melting

Answer

Bending

Question 18

What is the BEST definition of a chemical reaction?

Accepted Answer

A change in matter that produces one or more NEW substances

Answer

When two things combine and EXPLODE.

Question 19

The starting materials in a chemical reaction

Accepted Answer

Reactants

Answer

Products

Answer

Starters

Answer

Enders

Question 20

In which of these compounds are there twice as many oxygen atoms as hydrogen atoms?

Accepted Answer

H2SO4

Answer

H3PO4

Answer

HCIO3

Answer

H20

Question 21

Coal contains carbon and other elements. Carbon dioxide forms when coal burns in the presence of oxygen. Which of these is the best evidence that a chemical reaction occurs when coal burns?

Accepted Answer

A new substance is produced

Answer

The shape of the coal changes

Answer

Oxygen is present

Answer

Coal is made up of more than one element

Question 22

A teacher is demonstrating physical and chemical changes to her class. Which action should she use to demonstrate a chemical change?

Accepted Answer

burning a piece of paper

Answer

cutting a piece of paper

Answer

folding a piece of paper

Answer

tearing a piece of paper

Question 23

Which of the following describes a precipitate?

Accepted Answer

a solid forms when one liquid is poured into another

Answer

a liquid forms when a block of metal is heated

Answer

a gas forms when a solid is placed in a liquid

Answer

bubbles form when an acid is poured on a rock

Question 24

A pure substance...

Accepted Answer

is an element or a compound

Answer

is a mixture

Answer

is a compound or a mixture

Answer

is an element or a mixture

Question 25

A substance that cannot be broken down into any other substance by ordinary chemical means is called

Accepted Answer

Element

Answer

Molecule

Answer

Mixture

Answer

Compound

Question 26

NaHCO3 is an example of

Accepted Answer

A compound

Answer

A mixture

Answer

An element

Question 27

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

Accepted Answer

The Subscript

Answer

A Exponent

Answer

The Coefficient

Answer

A Molecule

Question 28

How many Mn atoms are found in the following compound?

2MnO₄

Accepted Answer

2

Answer

4

Answer

6

Answer

8

Question 29

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

Accepted Answer

Coefficient

Answer

Atom

Answer

Subscript

Answer

equation

Question 30

Which of the following equations are correctly balanced?

Accepted Answer

6CO2 + 6H2O ---> C6H12O6 + 6O2

Answer

CO2 + H2O ---> 3C6H12O6 + O2

Answer

12CO2 + H2O ---> C6H12O6 + O2

Answer

CO2 + 9H2O ---> C6H12O6 + O2

Question 31

Balance this equation:

H₂ + Cl₂ ---> HCl

Accepted Answer

H2 + Cl2 ---> 2HCl

Answer

H2 + 3Cl2 ---> 6HCl

Answer

3H2 + Cl2 ---> 6HCl

Answer

It is balanced.

Question 32

What is the right ratio of chemicals for the balanced chemical equation?

__Na + __H₂O --> __NaOH + __H₂

Accepted Answer

2,2 --> 2,1

Answer

4,4 --> 4,1

Answer

1,2 --> 2,4

Answer

1,2 --> 2,1

Question 33

What is the right ratio of chemicals for the balanced chemical equation?

__Ca + __H₂O --> __Ca(OH)₂ + __H₂

Accepted Answer

1,2 --> 1,1

Answer

2,1 --> 2,1

Answer

1,2 --> 2,4

Answer

1,2 --> 2,1

Question 34

What is the right ratio of chemicals for the balanced chemical equation?

__CO + __Fe₂O₃--> __Fe + __CO₂

Accepted Answer

3,1 --> 2,3

Answer

3,2 --> 1,1

Answer

3,2 --> 2,4

Answer

3,2 --> 2,1

Question 35

What is the right ratio of chemicals for the BCE (Balanced Chemical Equation)?

__CH₄ + __O₂ --> __CO₂+ __H₂O

Accepted Answer

1,2 --> 1,2

Answer

1,2 --> 2,1

Answer

1,2 --> 1,1

Answer

2,1 --> 2,1

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