Chem Unit 2

Matter and its interactions

100

Define Matter

Anything with mass that takes up space

200

4 states of matter

Solid, Liquid, Gas, Plasma

300

Elements vs. Compounds 

Elements cannot be chemically broken down into simpler substances - they are the building blocks of matter, compounds are substances composed of two or more types of elements. 

400

Heterogeneous vs. Homogeneous mixtures

Homogeneous mixtures are uniform, they mix uniformly and evenly. Heterogeneous mixtures do not mix, just compile together. 

500

Physical vs. Chemical Properties

Physical properties display their properties without changing in composition, chemical properties only display their change by changing their composition. 

Gas

100

Equation for gas pressure ? 

 pressure = force / area

200

when does gas exert pressure?

when the particles collide with the side of their container

300

pressure is effected by?

temperature and volume

400

what are the 4 units gas can be measured in?

atm, mmHg, torr, Kpa

500

the value of the gas constant in the ideal gas law is: 

R = 0.0821 (L x atm)/(mol x K)

Gas Laws

100

1 atm = _____ mmHg = _____ torr = ____ Kpa

1 atm = 760 mmHg = 760 torr = 101.3 Kpa

200

what are the 3 gas laws found in the combined gas law?

Charles

Boyles

Gay-Lussac's

300

What is Avagadros Law? 

V1 / n1 = V2 / n2

400

What is the equation for the Combined Gas Law

P1V1 / T1 = P2V2 / T2

500

What is the equation for the Ideal Gas Law

PV = nRT

Example Problems

100

if a gas is cooled from 323.0K to 273.15 K and the volume is kept constant, what final pressure would result if the original pressure was 750.0 mmHg?

634 mmHg

200

a gas has a volume of 300 mL when under a pressure of 740 mm of mercury. If the temperature remains constant, calculate its volume when under a pressure of 750 mmHg. 

296 mL

300

The pressure of a gas is 740. mmHg when its volume is 400. mL. Calculate the pressure if the gas is allowed to expand to 500. mL at constant temperature. 

592 mmHg

400

A gas occupied 1200. mL under a pressure pf 740. mmHg at a temperature of 19.0⁰C. The next day it was measured under a pressure of 754 mmHg at a temperature of 14.0 ⁰C. What volume did the gas occupy under these conditions? 

1180 mL

500

At 20.0⁰C a gas occupies 400. liters. If the pressure stays the same and the volume is changed to 200. liters, what is the new temperature in C? 

-126⁰C

Conversions

100

what is 30⁰ C in Kelvin

303 K 

200

What is 202.6 Kpa in torr?

1520 torr

300

What is 475 mmHg in atmospheres?

0.625 atm

400

what is 900 K in C?

627⁰C

500

what is 34200 Torr in atm?

45 atm