Physical vs Chemical Changes

Physical vs Chemical Changes

How do you know which type of change has occurred?

TYPE in this link to watch this video:

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The link is also posted in Google Classroom. You must watch the video in order to answer the questions.

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https://www.loom.com/share/d833c4666dcc40c09993a39301acf219

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Multiple Choice

What is the name of the robot in Generation Genius?

• Izzy

• Doc

• Burt

• Jeff

Multiple Choice

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

• Physical

• Chemical

Multiple Choice

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

• Iron

• Steel

• Aluminum

• Gallium

Multiple Choice

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

• Physical

• Chemical

Multiple Choice

When something burns, it is a __________.

• Physical Change

• Chemical Change

Multiple Choice

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

• True, anytime a gas is formed during a reaction it is always a new type of gas.

• False, the gas that is detected during the reaction may be a gas the same gas that was present before the reaction took place.

IMPORTANT CONCEPT:

You must determine the gas that is present after the reaction is a new gas.

Multiple Choice

Dr. Jeff determined the candy + soda demo was a PHYSICAL CHANGE. Which statement is true?

• Trapped the gas in a balloon and then poured the gas on lit candles. Since the gas caused the candle flames to go out, this proved the gas was CO₂. Since CO₂ is not present in the soda before adding candy, this proves a physical change took place.

• Trapped the gas in a balloon and then poured the gas on lit candles. Since the gas caused the candle flames to go out, this proved the gas was CO₂. Since CO₂ is in soda before adding the candy, this proves that no new gas was produced and therefore, this is an example of a physical change.

Multiple Choice

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

• fill up a ballon

• flame test

• measure temperature

• look at it

Multiple Choice

How does hydrogen react in a flame test?

• it pops

• it will burn brighter

Multiple Choice

Milk spoiling is an example of which type of change?

• Physical change

• Chemical change

Multiple Choice

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

• Physical change

• Chemical change

The next 4 slides are notes that you need to copy into your science notebook.

Attach a pic of your notes & submit in Google Classroom

Chemical Change

A type of change in which a new substance is formed. For example: burning something.

You may want to add some of these examples to your notes.

Physical Change

A type of change in which a new substance is NOT formed. For example: water boiling.

You may want to add some of these examples to your notes.

Multiple Choice

Which atomic diagram depicts a chemical reaction has occurred?