Evidence of a Chemical Change

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Tags

NGSS.MS-PS1-2

Which is NOT evidence of a chemical change?

• Unexpected color change

• gas produced

• breaking

• temperature change (with no outside heat added)

Tags

NGSS.MS-PS1-2

Which of the following options provides evidence of a CHEMICAL change?

• Wood is burned releasing ash and smoke

• Rocks separate when soil is sifted

• Boiling water bubbles when heated

• Salt dissolves in water

Tags

NGSS.MS-PS1-2

Which of these indicates that a chemical change occured during an experiment?

• a solid formed when two liquids were mixed

• there was no temperature change during the experiment

• there was no change in mass during the experiment

• one substance was more dense than the other

Tags

NGSS.MS-PS1-2

In a controlled experiment, acid was dropped on a sample of chalk. Which of the following results would show that a chemical reaction took place?

• The sample of chalk formed a wet puddle on its surface

• The sample of chalk had partially dissolved.

• The sample of chalk formed bubbles, showing a release of gas

• The sample of chalk broke into smaller pieces

Tags

NGSS.MS-PS1-2

The best evidence for the formation of a new substance is the observation of the

• solid settling

• solid disappearing

• liquid remaining clear

• bubbles forming

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Fizzing, foaming, and burning are all examples of

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-2

Iron rusts

• Physical Change

• Chemical Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following describes a chemical change?

• Water goes from liquid to gas when boiling

• Ice goes from solid to liquid when melting

• Gray iron turns reddish-brown when rusting

• Steam loses heat when condensing

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is NOT an indicator of chemical change?

• Formation of a gas

• Formation of a solid

• Change in texture

• Change in color

Tags

NGSS.MS-PS1-2