CFA #2 Chemical and Physical Changes (Term 1)

Which of the following is a sign that a chemical reaction has occurred?

• change in shape

• melting

• formation of a gas

• dissolving

Tags

NGSS.MS-PS1-2

Is the melting of butter a chemical or physical change?

• chemical

• physical

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Which one of the following is an example of a Chemical change?

• Ripping paper

• cooking an egg

• cracking an egg

• dissolving sugar in water

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What happens in ALL chemical changes?

• Change in state of matter

• A new substance is formed

• Bubbles are produced

• An explosion

• All of these

Tags

NGSS.MS-PS1-2

Gatorade powder is dissolved in water. Is this a physical or chemical change?

• Physical

• Chemical

Tags

NGSS.MS-PS1-2

A clear liquid from a flask is poured into another clear liquid in a beaker. Which of the following results of this procedure would indicate a new substance was formed?

• The level of the substance in the beaker is higher after the other liquid is added.
• A yellow solid forms and then settles to the bottom of the beaker.
• Small white crystals are left behind in the flask that held the first liquid.
• The mass of the combined liquids is greater than either original liquid.

Tags

NGSS.MS-PS1-2

Four students performed four different investigations by combining different substances. Which of the observations is most indicative of a chemical reaction?

• investigation 1
• investigation 2
• investigation 3
• investigation 4

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a container, a solid consisting of clear crystals is combined with a blue liquid and the following observations are obtained: How many of the listed observations indicate a new substance was formed?

• 1
• 2
• 3
• 4

Tags

NGSS.MS-PS1-2

Which of the following is a physical change?

• Rusting of iron

• Combustion of magnesium ribbon

• burning a candle

• Melting of wax

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

• sugar and oxygen reacting to produce water and carbon dioxide

• honey dissolving in tea

• burning a piece of wood

• metal rusting after being left out in the rain