Chemical & Physical Changes Review

In a physical change:

• New products are produced

• Bubbling and fizzing occur

• An object may change in size and shape

• A color change is easily observed

Answer explanation

In a physical change, an object may change in size and shape without the formation of new products, bubbling, fizzing, or a color change.

A chemical reaction can occur when:

• New substances are produced

• Bubbling and fizzing occur

• Light and heat are given off when substances are mixed together

• All of the above

Answer explanation

The correct answer is 'All of the above' because a chemical reaction can involve the production of new substances, bubbling and fizzing, as well as the release of light and heat.

Tags

NGSS.MS-PS1-2

Cutting cookie dough into star shapes is an example of a:

• Chemical Change

• Physical Change

Answer explanation

Cutting cookie dough into star shapes is a Physical Change because it alters the shape and size of the dough without changing its chemical composition.

When an Alka Seltzer tablet is dropped into a glass of water, the water bubbles and fizzes as the tablet dissolves. This would be an example of a:

• Chemical Change

• Physical Change

Answer explanation

The bubbling and fizzing when an Alka Seltzer tablet dissolves in water is a result of a chemical change, where new substances are formed through a chemical reaction.

Tags

NGSS.MS-PS1-2

Baking soda and vinegar react together to form water and carbon dioxide. The product(s) in this chemical reaction would be:

• Baking Soda and Vinegar

• Vinegar Only

• Water and Carbon Dioxide

• Water only

Answer explanation

The correct product(s) in the chemical reaction between baking soda and vinegar are water and carbon dioxide.

Tags

NGSS.MS-PS1-2

Breaking an egg is an example of a chemical change since it is difficult to return the egg to its original state.

• TRUE

• FALSE

Tags

NGSS.MS-PS1-2

An ice pop melting is an example of a physical change because:

• There is a change in color

• The molecules stay the same

• It can be reversed

• Both B and C

Tags

NGSS.MS-PS1-4

Which choice below lists the following words in order from smallest to largest when examining sugar (Sucrose)?

All of the following are proof of a chemical change except:

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

When a physical change occurs, at least one new substance is formed.