Chapter 2- Mathematics Of Chemistry

Question 1

Measurement

Answer 1

A quantity that includes both a number and a unit

Question 2

SI Units

Answer 2

System of measurement based in the metric system

Question 3

Length in SI Units

Answer 3

Meter (m)

Question 4

Mass in SI Units

Answer 4

Kilogram(kg)

Question 5

Temperature in SI Units

Answer 5

Kelvin (K)

Question 6

Time in SI Units

Answer 6

Second (s)

Question 7

Amount of a substance in SI Units

Answer 7

Mole (mol)

Question 8

Electric Current in SI Units

Answer 8

Ampere (A)

Question 9

Luminous Intensity in SI Units

Answer 9

Candela (cd)

Question 10

Metric prefixes and values

Answer 10

Giga-G-1,000,000,000
Mega-M-1,000,000
Kilo-k-1000
Hecto-h-100
Deka-da-10
-m-1
Deci-d-1/10
Centi-c-1/100
Milli-m-1/1000
Micro-weird u thing- 1/1,000,000
Nano-n-1/1,000,000,000
Pico-p-1/1,000,000,000,000

Question 11

Scientific notation

Answer 11

Way to express numbers as the product of 2 numbers: a coefficient and a number ten raised to a power

Question 12

Liter

Answer 12

(L); volume of a cube that measures 10 cm on each side

Question 13

Weight

Answer 13

Measure of force that is equal to the gravitational pull to an object

Question 14

Kinetic energy

Answer 14

Energy due to motion

Question 15

Temperature

Answer 15

Measure of average kinetic energy of particles in matter

Question 16

Energy

Answer 16

Capacity to do work of produce heat

Question 17

Joule

Answer 17

(J) SI Unit of energy

J=kg* m2/s2

1 calorie = 4.184 J

Question 18

Accuracy

Answer 18

Measure of how close a measurement is to the correct or accepted value of the quantity being measured

Question 19

Precision

Answer 19

Measure of how close a series of measurements are to one another

Question 20

Accepted value

Answer 20

The true or correct value based o general agreement with reliable reference

Question 21

Experimental value

Answer 21

Value that is measured during the experiment, may be different than the accepted value

Question 22

Error

Answer 22

Difference between the experimental and accepted values

Error=experimental value-accepted value

Question 23

Percent error

Answer 23

Absolute value of the error divided by the accepted value and multiplied by 100%

% error=(lexperimental value- accepted valuel/ accepted value)*100%

Question 24

Significant figures

Answer 24

Consist of all the certain digits in that measurement plus one uncertain or estimated digit

Question 25

Sig. Fig. Rules

Answer 25

1) all nonzero digits in a measurement are significant
2) 0’s that appear between other non0 digits are always significant (sandwich)
3) zeros that appear in front of all nonzero digits are called left end zeros. Left end zeros are never significant.
4) zeros that appear after all nonzero digits are called right end zeros. Right end zeros in a number that lacks a decimal point aren’t significant
5) right end zeros in a number with a decimal point are significant, this is whether the zeros occur before or after the decimal point

Question 26

Conversion factor

Answer 26

Ratio of equivalent measurements

Question 27

Dimensional analysis

Answer 27

Technique that uses units of the measurement in order to correctly solve problems
(I.e. how many seconds are in one day?)

Question 28

Derived unit

Answer 28

Unit resulting from a mathematical combo of SI base units

I.e. volume and energy

Question 29

Density

Answer 29

Ratio of the mass of an object to its volume

D=M/V