Chemical vs. Physical Changes

If two substances are mixed and a new substance is formed, what type of change is it?

• Physical Change

• Chemical Change

• Nuclear Change

• Biological Change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Placing the spoon in hot water was a physical change since the melted metal was still...

• gallium

• iron

• steel

• aluminum

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When a substance changes states (melts, evaporates, etc.) it is often what type of change?

• Physical change

• Chemical change

• Biological change

• Nuclear change

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Fill in the blank using physical change or chemical change. When something burns, it is a _________________

• physical change

• chemical change

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

True or false: since gas is detected during the candy + soda demo, it is an example of a chemical change.

• True

• False

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is the evidence that the gas made in the mentos + soda demo was carbon dioxide?

Answer explanation

The gas produced in the mentos + soda demo is carbon dioxide, evidenced by the rapid release of bubbles and fizzing, which indicates the escape of CO2 that was dissolved in the soda under pressure.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of these is the most reliable way to see if a new gas has formed?

• Fill up a balloon

• Flame test

• Measure temperature

• Look at it

How does hydrogen react in a flame test?

Answer explanation

In a flame test, hydrogen burns with a pale blue flame, indicating its presence. It does not produce a characteristic color like other elements, but the flame's behavior confirms hydrogen's reactivity.

Tags

NGSS.MS-PS1-2

Milk spoiling is an example of which type of change?

Tags

NGSS.MS-PS1-2

What type of change is mixing air into egg whites to make frosting?