Exploring Chemical and Physical Properties

Which of the following is an example of a chemical property?

• Melting point

• Reactivity with oxygen

• Density

• Boiling point

A student observes that a piece of metal has rusted over time. Which type of change does this represent, and what evidence supports this conclusion?

• Physical change; the metal's shape has changed

• Chemical change; a new substance has formed

• Physical change; the metal has changed color

• Chemical change; the metal has melted

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is a physical change?

• Burning wood

• Dissolving sugar in water

• Rusting iron

• Baking a cake

A student is tasked with identifying whether a change is chemical or physical. They observe a color change and the release of gas. What reasoning should they use to determine the type of change?

• It is a physical change because the color change is reversible

• It is a chemical change because both color change and gas release are evidence of new substances forming

• It is a physical change because gas release is a physical process

• It is a chemical change because the process is endothermic

Tags

NGSS.MS-PS1-2

Which of the following is an example of a physical property?

• Flammability

• Reactivity with acid

• Solubility

• Combustion

A student mixes two clear solutions, and a precipitate forms. What type of change has occurred, and what evidence supports this conclusion?

• Physical change; the solutions are still clear

• Chemical change; a solid has formed from the solutions

• Physical change; the solutions have mixed

• Chemical change; the temperature of the solution has decreased

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is not evidence of a chemical change?

• Change in temperature

• Formation of a precipitate

• Change in state

• Emission of light

Tags

NGSS.MS-PS1-2

A student observes that ice melts into water. What type of change is this, and what evidence supports this conclusion?

• Chemical change; the ice has changed its chemical structure

• Physical change; the ice has changed state from solid to liquid

• Chemical change; the ice has absorbed heat

• Physical change; the ice has changed color

Tags

NGSS.MS-PS1-4

Which of the following is an example of a chemical change?

• Freezing water

• Melting wax

• Digesting food

• Cutting paper

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A student is asked to determine whether a change is physical or chemical. They observe a temperature increase and a color change. What reasoning should they use to determine the type of change?

• It is a physical change because the temperature increase is reversible

• It is a chemical change because both temperature increase and color change indicate new substances

• It is a physical change because the color change is temporary

• It is a chemical change because the process is exothermic

Tags

NGSS.MS-PS1-2