Do Now - Chemical & Physical Changes

In physical changes, substances might change in __________ but not in __________.

• appearance, composition
• volume, state of matter
• texture, color
• weight, mass

True or False: a physical change may produce a new particle.

• True
• False

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

• Change of color

• Release of gas

• Production of light

• Dissolving

Tags

NGSS.MS-PS1-2

Which of the following is NOT an indicator of a physical change?

• Change in size or shape

• Change of color

• Change in IMF/State

• Dissolving

NaCl_(s) -> NaCl_(aq)

Is the above reaction a chemical or physical change?

• Physical; it does not change the composition of the particle

• Physical; it changes state of matter

• Chemical; it dissolves into the water

• Chemical; it changes state of matter

Tags

NGSS.MS-PS1-2

NaCl_(aq) + AgNO_3(aq) -> AgCl_(s) + NaNO_3(aq)

Is the above reaction a chemical or physical change?

• Physical; it changes the composition of the particle

• Physical; it changes state of matter

• Chemical; it changes the composition of the particle

• Chemical; it changes state of matter

Tags

NGSS.MS-PS1-2

NaCl_(aq) + AgNO_3(aq) -> AgCl_(s) + NaNO_3(aq)

What chemical indicator do you think you would see from the above reaction?

• formation of a precipitate

• production of gas

• dissolving

Answer explanation

Watch the video to see the final indicator of a chemical change.

Tags

NGSS.MS-PS1-2

S_(s) -> S_(l)

Is the above reaction a chemical or physical change? What indicator are you basing that on?

S is sulfur

• Physical; it changes color

• Physical; it changes state of matter

• Chemical; it precipitates

• Chemical; it changes state of matter

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

What kind of change is occurring? How do you know?

• Chemical; a new molecule is forming

• Chemical, a release of gas

• Physical; change in state of matter

• Physical; a formation of solid

Tags

NGSS.MS-PS1-2

What kind of change is occurring? How do you know?

• Chemical; a new molecule is forming

• Chemical, formation of a precipitate

• Physical; change in state of matter

• Physical; forms a solution (dissolving)

Tags

NGSS.MS-PS1-2