Indicators of chemical reaction

Evidence of a chemical reactions is anything that shows - 

• a new substance has formed
• a solid dissolved in a liquid
• interaction between 2 gases
• a change in the state of matter

Tags

NGSS.MS-PS1-2

Shirin breaks Xavier's pencil. What type of change has occurred?

• physical

• chemical

• property

• puberty

Which of these is NOT a sign that a chemical change has occurred?

• A loss of transparency

• An unexpected color change

• A temperature change

• The formation of a new substance

Tags

NGSS.MS-PS1-2

Which of the following is a chemical change?

• water freezes to form ice

• sugar dissolves in water

• wood burns in a campfire

• a piece of metal expands when heated

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When coal burns carbon dioxide is produced from the carbon in coal and the oxygen in air. Which of these is the best evidence that a chemical reaction occurs when coal burns?

• The shape of the coal changes

• Oxygen is present

• A new substance is produced

• Coal is made up of more than one element

Tags

NGSS.MS-PS1-2

a copper penny turning greenish after a few years.

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-2

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

• Chemical Change
• Physical Change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

The smell made from spraying perfume.

• Chemical Change

• Physical Change

Tags

NGSS.MS-PS1-2

The smell your dog makes after eating to much people food.

• Chemical Change
• Physical Change

Tags

NGSS.MS-LS1-7

NGSS.MS-PS1-2

Which of the following is a chemical change?

• the rusting of iron
• dissolving salt in water
• melting an ice cube
• bending a copper wire

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5