Science Ch. 2

Density:

D = m/v

Always expressed in g/mL

Quantitative

ex: Identifying 4 metal object lab

Viscosity

Resistance to Flow

Can vary with temperature

Qualitative

ex: shampoo and water

Conductivity

A materials ability to allow heat to flow/ travel

Quantitative

ex: any metal object

Malleability

The ability of a solid to be hammered without shattering

Brittle objects shatter

Qualitative

ex: piece of zinc

Hardness

Comparative test between two objects to see which one will scrape/ scratch the other

Qualitative

ex: zinc and aluminum

Odor

What something smells like

Test by wafting

Qualitative

ex: water vs. alcohol

Physical Properties

Any characteristics of a material that can be observed or measured without changing the composition of the substances in the material.

Melting Point

The temperature at which a substance changes from solid to pure liquid.

Boiling point

The temperature at which a substance boils.

Filtration

A process that separates materials based on size of the particles.

Distillation

A process that separates the substances in a solution based on their boiling points.

Physical Change

When some of the properties of a material change, but the substances in the material stay the same.

Evaporation

when a liquid is turned in to vapor or to its original form as a solid by heat

Chart

Flammability

a materials ability to burn in the presence of oxygen

Reactivity

the property that describes how readily a substance combines chemically with other substances

Chemical change

chemical change occurs when a substance reacts and forms 1 or more new substances

4 common types of evidence for a chemical change are a change in in color, the production of a gas, the formation of a precipitate and temperature change

Question #1

I have water and sand mixed together. What separation technique should be used?

Question #2

I have oil and vinegar mixed together in a glass. What separation technique should be used?

Question #3

What is a chemical change

Question #4

What are the MELTING, FREEZING, and BOILING points?

Question #5

What are the 4 ways to recognize a chemical change?