Chemical and Physical Changes

What type of change involves a reaction that forms new and different substances?

• Physical change

• Chemical change

• Mechanical change

• Electrical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

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

• Rusting of iron

• Burning wood

• Freezing water

• Baking a cake

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

• Tearing up paper

• Sifting sand

• Adding vinegar to milk

• Melting ice

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

If you burn paper, the ​ (a)   in the paper change to molecules of ash and smoke. This is a ​ (b)   change.

• chemical

• molecules

• physical

• liquid

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

A chemical change is when a ​ (a)   is formed. A physical change is when ​ (b)   is formed.

• new substance

• NO new substance

Answer explanation

A chemical change occurs when a new substance is formed as a result of a chemical reaction, while a physical change occurs when there is a change in the state or appearance of a substance without altering its chemical composition. In this question, the correct choices are 'new substance' for a chemical change and 'NO new substance' for a physical change.

Tags

NGSS.MS-PS1-2

Which is a chemical change and which is a physical change?

b

a

Dissolving

Photosynthesis

Tags

NGSS.MS-PS1-2

Baking a cake is a (a)   ​ change.

• chemical

• physical

• emotional

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Match the following:

• changes that cause a substance to change into a new substance

• Chemical Changes

• Examples of Chemical Changes

• Freezing, Grinding, Chopping, Tearing, Evaporating

• Examples of Physical Changes

• Physical Changes

• Changes that change the appearances of the substance, not is identify.

• Combustion, Rusting, Burning, Corroding

Tags

NGSS.MS-PS1-4

NGSS.MS-PS1-5

Select all of the following examples that are chemical changes​ ​ (a)   ​ (b)   ​ (c)  

• Breaking a piggy bank

• fireworks exploding

• getting a haircut

• melting icicle

• hammering metal

• mixing baking soda and vinegar

• a rusty nail

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following changes cannot be reversed?

• Physical change

• Chemical change

• Mechanical change

• Electrical change

Tags

NGSS.MS-PS1-5