Chemistry

Page
7

Should you volunteer your toast as an example of a physical or chemical change?

Why?

Slide 73

A different chemical substance is formed when a

piece of cloth is cut.

cup breaks.

candle burns.

piece of chalk breaks.

Slide 74

Lucy noticed that her coin collection had begun to tarnish. Some of the metal in the coins had begun to change color. The formation of tarnish is most similar to which of the following changes?

shredding a piece of paper into hundreds of tiny strips

dropping a dinner plate on the floor

melting ice cubes in a glass of juice

burning a piece of paper to ashes in a fireplace

Slide 75

Which is an example of a chemical change?

ice melting

salt crystals being ground to powder

water evaporating

wood burning

Slide 76

The law of

Conservation of matter - matter can neither be created nor destroyed.

(Actually, NOT really true).

Matter does not “magically appear" or" disappear”.

Slide 77

Decomposition

Simple Reactions

Synthesis

(Combination)

Single

Replacement

Double

Replacement

Slide 78

Decomposition

Synthesis

Single

Replacement

Double

Replacement

A

B

A

B

+

A

B

A

B

+

A

B

A

B

+

C

+

C

A

B

A

B

+

C

+

C

D

D

Slide 79

Decomposition

Synthesis

Single

Replacement

Double

Replacement

A

B

A

B

+

A

B

A

B

+

A

B

A

B

+

C

+

C

A

B

A

B

+

C

+

C

D

D

Slide 80

+

+

+

+

+

+

Synthesis

Decomposition

Single

Replacement

Double

Replacement

Slide 81

A displacement reaction:

metallic copper with silver nitrate

Cu + Ag NO3

Ag + Cu(NO3)2

Slide 82

The study of chemicals that make up living things.

Slide 83

Biochemicals