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S3w4 Wednesday Bellringer

Last updated 6 months ago

5 questions

8

1

1

1

1

Question 1

1.

Classify each of the following as chemical and physical change

Paper burns
Food digest
ice melts

Question 2

2.

Imagine that you break a a glass cup. Has a new substance been formed?

Yes

No

Question 3

3.

Breaking a glass cup is a ......

physical change

chemical change

Question 4

4.

Is NaCl (table salt) dissolving in water a physical or a chemical change?

Physical change because a new substance was created

Chemical change because a new substance was created

Physical change because a new substance was not created 

Chemical change just 'cause

Question 5

5.

You may have been told that a chemical change is something you can't undo, but a physical change is something you can undo. That isn't really true, but it is a decent rule of thumb. The better definition is:

it is a chemical change if the molecules are changed

it is a chemical change if you saw bubbles

it is a chemical change if the color changed

it is a chemical change if something changed phase or dissolved.

silver tarnish

glass breaks

baking bread

water evaporates

dead leaves decaying

Physical Change

Chemical Change