ARRANGEMENT OF MATTER

Unit 2 – Continued7th Grade Science

water : plants :: host :

party

resta

urant

game sh

ow

parasite

14%

43%38%

5%

1. party2. restaurant3. game show4. parasite

IV. Properties of Matter

A. Physical Properties1. Mass (weight) – Amount of matter in an element or object.

2. Volume – The space an object takes up.

A. Physical Properties3. Density – How much mass there is in a certain volume

Formula – D = M/V

A. Physical Properties4. Boiling Point – The temperature at which a substance boils.

5. Melting Point – The temperature at which a substance melts.

6. State of Matter – Solid, Liquid, or Gas

B. Chemical Properties1. Burning

2. Radioactivity

3. Rotting

4. Rusting

5. Curdling

V. How Can Matter Be Changed?

A. Physical vs. Chemical Change

1. Physical Change - Change from one state to another state. Does not change the original form. NO NEW SUBSTANCE!2. Chemical Change - Change to form a NEW SUBSTANCE…CANNOT BE REVERSED!

Physical Change WordsCutTearFoldPaintMeltBoilEvaporateSublimateGrind

Chemical Change Words

BurningRottingRustingCurdlingReactingRadioactive

C. Signs of Chemical Change

1. Heat given off2. Color change3. Smell4. Light given off5. Bubbles form6. Heat required for the reaction7. Precipitate forms (solid formed from

reaction)8. New Substance forms

D. Example of a Chemical Change

CaCl2 + 2 Na HCO3 = CaCO3 + 2 NaCl + H

Is it balanced? How can you check?

Which is an example of a physical change?

An apple cu

t in half

An apple ro

tting

An apple bakin

g

An apple rip

ening

41%

14%9%

36%1. An apple cut in

half2. An apple rotting3. An apple baking4. An apple ripening

Which is an example of a chemcial change?

Ice m

elting

Oil boilin

g

Water c

ondensing

Milk

spoilin

g

32%

58%

0%

11%

1. Ice melting2. Oil boiling3. Water condensing4. Milk spoiling