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S3w4 Wednesday Bellringer

Last updated 5 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
silver tarnish
glass breaks
baking bread
water evaporates
dead leaves decaying

Physical Change
Chemical Change

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.