Week Two (Measurements)

Question 1

% Concentration

1. ) % Concentration means grams/100 mL
2. ) 1:1,000 means 1 gram/1,000 mL

Formula to calculate concentration?

Formula to calculate amount?

Answer 1

C = A/V

A = C x V

Question 2

Farenheit to Celcius (PP Page 8)

How to calculate Farenheit?

How to calculate Celcius?

Celcius as a function of Farenheit?

Answer 2

F = 9/5(C) + 32

C = 5/9 x (F - 32)

F = mC + b

Question 3

Charles’s Law (PP Page 10)

States that the ______ of a gas is directly proportional to the ______ (When pressure is constant)

Formula?

Answer 3

Volume, Temperature

V/T = k

Question 4

Boyle’s Law (PP Page 11)

States that ______ and _______ are inversely proportional when temperature is constant

Formula?

Answer 4

Volume and Pressure

PV = k

Question 5

Physical Properties

A physical property can be ______ or ______ without changing the ______ makeup of a substance

A physical change occurs without producing a new ______ substance

Answer 5

Observed, Measured

Chemical

Question 6

Exact Numbers

1 Inch = 2.54 cm

Answer 6

.

Question 7

Precision vs. Accuracy (PP Page 15)

Precision is the ______ and _______ of a test (reliability)

_____ _____ produces precision in a test

Accuracy is the ______ of test measurements (validity)

______ error reduces accuracy in a test

Answer 7

Consistency, Reproducability

Random Error

Trueness

Systematic

Question 8

Improving Accuracy

Accuracy is improved by making ______ measurements and taking the _____

Accuracy is assessed by calculating the ______ error

Answer 8

Replicate, Average

Percent

Question 9

Improving Precision

Precision is improved by careful lab ______ and/or by using instruments with more ______ figures

More significant figures imply greater ______

Answer 9

Technique, Significant

Precision

Question 10

Absolute Zero/Kelvin Scale

Absolute zero is the _____ possible temperature

We _____ reach absolute zero

The ______ scale begins at absolute zero

0 K = absolute zero = - 273.15

A Kelvin is the same as __ _____ celcius

K = C + 273.15

Answer 10

Coldest

Cannot

Kelvin

1 Degree Celcius

Question 11

Conversion Factors

1 Inch = 2.54 cm

1 cm = 0.4 inch (this is 1 divided by 2.54)

**To check: 0.4 x 2.54 = 1

Question 12

Conversion Factors

1 kg = 2.2 lbs

1 lb = 0.454 kg (this is 1 divided by 2.2)

**To check: 0.454 x 2.2 = 1

Question 13

Density

Density is the ratio of ____ to ____

Formula for density?

Most common units for density are _____

The density of water is _____

The density of mercury is _____

Answer 13

Mass to Volume

d = M/V

g/mL

1. 0 g/mL
2. 6 g/mL

Question 14

Density and Specific Gravity

Formula for specific gravity?

Specific gravity is the ratio between an object’s _____ and the density of the _____

Specific gravity is _____ and does not depend on the ____

Specific gravity only ____ density when units of measure are ______, since the density of water is ______

Answer 14

SG = density of object/density of water

Density, Water

Dimensionless, Units

Equals, grams/mL, 1 g/mL