Sep 13: Signs of Chemical Changes

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

One of the signs of a chemical reaction taking place is:

• Bubbles are produced 
• Reactants are not combining
• Products are not forming
• Color is not changing

Tags

NGSS.MS-PS1-2

Which of the following describes a precipitate?

• a liquid forms when a block of metal is heated
• a solid forms when one liquid is poured into another
• a gas forms when a solid is placed in a liquid
• bubbles form when an acid is poured on a rock

Tags

NGSS.MS-PS1-2

Which is NOT an indication of a chemical change?

• temperature change
• formation of a precipitate
• shape change
• production of light

Tags

NGSS.MS-PS1-2

Which of the following is an example that includes evidence of a chemical change?

• 
• 
• 
• 

Tags

NGSS.MS-PS1-2

What is the evidence that a chemical change has taken place?

• Color change

• Light produced

• state change

• mixture

Tags

NGSS.MS-PS1-2

What is the evidence that a chemical change has taken place?

• gas production

• change in energy

• change in color

• production of a precipitate

Tags

NGSS.MS-PS1-2

Identify the change as physical or chemical

• physical

• chemical

Tags

NGSS.MS-PS1-2

Identify the change as physical or chemical.

• physical

• chemical

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What is the evidence that a chemical change has taken place? Choose all that apply.

• Light is produced (change in energy)

• Heat is produced (change in energy)

• Change in shape

• Production of a gas

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4