Chem 115 Exam #1

What are the two ways matter can be classified?

1.) Pure substance = constant composition

2.) Mixture substance = a mix of 2 or more

What are the two differenciating characteristics?

Separation, identification

Name the properties that would be good for differentiating characteristics?

Boiling point, density, viscosity, solubility

Name the intensive properties

boiling point, density, solubility

Name the extensive properties

Mass, volume

What is normal boiling point

1atm; sea level

Equation to convert Kelvin into C

Temp of Celcius + 273.15

Gas —> solid

Deposition

Solid —> gas

sublimation

gas —> liquid

condensation

liquid —> gas

vaporization

solid —> liquid

melting

liquid —> solid

freezing

During cooling/melting period of a substance does temperature change?

No it stays the same until phase is fully complete

What is triple point

All 3 phases intersect (solid, liquid, gas)

What is the critical point

the temp and pressure at which a liquid as gas phase become indistinguishable

What is atm used for?

Units of measure for pressure

What is normal boiling point

100 degrees C, 1 atm (760)

Vapor pressure

Boiling of a liquid occurs whn its vapor pressure = the atmospheric pressure

Votile definition

more easily evaporated

Methods of separating air/solids/liquids

Filtration, distillation

Filtration

Using a filter

Distillation

Based of the differences in BOILING POINTS

Key ideas for the particulate model of matter

1.) all matter is made of tiny particles

2.) particles are always moving

3.) there are spaces between the particles

4.) particles are attracted to each other

Does temp directly relate to kinetic energy

YES