Physical and Chemical Properties & Changes

Mrs. Hooks6th Grade Science

Physical Properties

• Physical Properties- any characteristic that can be observed or measured without changing the identity of the object.

– Observations are made using your 5 senses1. Sight2. Hearing3. Touch4. Smell5. Taste- NO NO!! Do not taste in labs!!

Matter- anything that has mass and takes up space.

Physical Properties continued….

Physical Properties (ob- observable, m- measured)

1. Color (Ob)

2. Size (ob)

3. Shape (ob)

4. Length (ob/m)

5. Mass (ob /m)- the amount of matter in an object

6. Volume (ob/m)- the amount of space an object takes up

7. Density- (ob/m)- the amount of mass a material has in a given volume D=M/V

Physical Properties Continued……• 8. State of matter (ob)- depends on its temperature and

pressure. Solid, liquid, gas, and plasma

• 9. melting point (ob/m)- the temperature at which a solid becomes a liquid– Temperature at which a solid becomes a liquid

is 0 ° Cwater• 10. boiling point (ob/m- the temperature at which a

substance in the liquid state becomes a gas. – Temperature at which a liquid becomes a gas

100°Cwater

Solid Liquid Gas Plasma

Fixed shape

Takes the shape of container

Takes shape of container

Occurs at very high temperatures

Fixed Volume

Fixed volume

Volume of container

Fluorescent light bulbs, lightning

Metallic Properties

Physical properties of metals

Luster

Malleability- ability of some metals to be hammered, pressed, or rolled into thin sheets

Ductility- ability of some metals to be drawn into wires.

Physical Change

• The physical properties of a substance change, but the identity of the substance does NOT change.

• Ask yourself 2 Question……1. Is the substance still the same thing? YES2. Can I change it back? YES

THEN IT IS A PHYSICAL CHANGE!!!!

Dichotomous Key• A tool used to determine the physical

properties or characteristics to determine the identity of a specimen and classify them.

Measurements

• Massgram

• Densityg/cm³

• Length centimeter, meter

• Volumecm³

Chemical Properties

• Chemical property- any characteristic that gives a substance the ability to undergo a change that results in a new substance1. Flammability2. Reacts with oxygen3. Reacts with water4. Reacts with light

Chemical Change• A change in the identity of the substance due

to the chemical properties of that substance.

Ask yourself 2 Question……1. Is the substance still the same thing? NO2. Can I change it back? No

THEN IT IS A chemical CHANGE!!!!

Here’s your sign!

• If you observe one of these things, chances are it is a Chemical Change!– Bubbles– Production of heat– Production of light– Smoke – Change in color (can be either P or C)– Production of sound

Chemical

Change