Distinguishing Physical and Chemical Changes

What happens when paper is crumpled?

• It returns to its original shape automatically

• Its chemical composition changes

• It undergoes a chemical change

• Its physical appearance changes but not its composition

What happens when ice melts and refreezes?

• It forms a new substance

• It becomes water vapor

• It undergoes a chemical change

• It changes state reversibly

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

What is a physical change?

• A change where new substances are formed

• A change affecting the substance's chemical structure

• A permanent and irreversible change

• A change in the physical properties without altering chemical composition

What does the litmus test indicate in a chemical reaction?

• Speed of the reaction

• pH change indicating acidity or basicity

• Temperature of the reaction

• Presence of water

What is formed when magnesium burns in air?

• Magnesium oxide

• Magnesium chloride

• Magnesium sulphate

• Magnesium hydroxide

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the effect of sulfuric acid on copper sulfate solution?

• It neutralizes the solution

• It precipitates copper

• It changes the solution to green

• It decreases the solution's temperature

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the result of adding copper sulfate to iron in water?

• Iron sulfate is formed

• Copper deposits on the iron

• Iron evaporates

• The solution turns colorless

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What indicates a chemical change has occurred?

• Temporary change in physical properties

• Formation of new substances and permanent change

• Reversible changes in physical state

• Change in color and temperature without new substances

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What does the reaction between vinegar and baking soda produce?

• Sulfuric acid

• Hydrochloric acid

• Carbon dioxide

• Sodium chloride

Tags

NGSS.MS-PS1-2

What is rusting an example of?

• Reversible change

• State change

• Chemical change

• Physical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5