Characteristics of Chemical Reactions

A chemical reaction is __________.

• A change to a substance that occurs without forming a new substance, such as a change in size or state of matter

• When ice melts into water

• When two or more substances interact and chemically change, producing different chemical substances

• When water freezes to make ice

Tags

NGSS.MS-PS1-2

A physical change is __________. You may choose more than one.

• A change to a substance that occurs without forming a new substance, such as a change in size or state of matter

• When ice melts into water

• When two or more substances interact and chemically change, producing different chemical substances

• When water freezes to make ice

Tags

NGSS.MS-PS1-4

Ice melting is a ____________________

• physical change

• chemical change

Tags

NGSS.MS-PS1-4

An apple rotting is a ___________.

• physical change

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Metal rusting is a chemical change because ___________

• there was a change in temperature

• there was a change in color

• there was a release of light

• there was a production of gas

Tags

NGSS.MS-PS1-2

Which of the following are indicators of chemical reactions? (select all that apply)

• production of gas

• production of light

• change in temperature

• formation of a precipitate (when a solid forms from mixing two liquids)

• color change

Tags

NGSS.MS-PS1-2

Choose the correct statement

• In chemical reactions, molecules can change through the rearrangement of their atoms

• mass can be created

• mass can be destroyed

• Chemical reactions can occur even if new substances aren't formed

Tags

NGSS.MS-PS1-5

O₂ + 2H₂ --> 2H₂O

Identify the reactant(s). You may choose more than one.

• O₂

• H₂

• H₂O

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

O₂ + 2H₂ --> 2H₂O

Identify the product(s). You may choose more than one.

• O₂

• H₂

• H₂O

Tags

NGSS.MS-PS1-2

A chemical reaction occurs that involves combining 4 atoms of hydrogen and 2 atoms of oxygen. After the reaction, how many atoms of each element will there be?

• 3 hydrogen, 2 oxygen

• 4 hydrogen, 2 oxygen

• 2 hydrogen, 4 oxygen

• 2 hydrogen, 3 oxygen

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5