Vocab

Question 1

Exponential Number

Answer 1

A number time 10 to the nth power

Ex: 1.3x10⁸

Question 2

Unit Conversions

Answer 2

Convert from one unit system to another

Question 3

Conversion Factor

Answer 3

Fraction made up as:

old unit

Question 4

Density

Answer 4

The mass of a substance in a unit volume of that substance

expressed in g/mL

Question 5

Significant figures

Answer 5

What numbers in a measurement are meaningful

Question 6

Accuracy

Answer 6

Nearness of the measure value to the actual value

Question 7

Precision

Answer 7

The degree of agreement between several measured values

Question 8

Chemical Change

Answer 8

A change in the composition of matter

Is NOT reversible

Often visible as:

1. evolution of heat/light
2. Evolution of gas
3. production of insoluble solid (precipitate)
4. visible color change

Familiar Chemical Changes:

1. Rusting/oxidizing
2. Cooking/Baking
3. burning/combustion/explosion

Question 9

Physical Change

Answer 9

A change in state but NOT chemical composition

usually easily reversible

Familiar physical changes:

1. Melting
2. Freezing
3. boiling/evaporation
4. Condensation
5. Dissolving

Question 10

Calorimetry

Answer 10

Study of how much heat is involved in a temperature of physical change

Question 11

Thermochemistry

Answer 11

Study of how much heat is involved in a chemical change

Question 12

Exothermic

Answer 12

Heat is given off (extracted) from the system as the process takes place

Question 13

Endothermic

Answer 13

heat is absorbed by (or added to) the system as the process takes place