Lecture 5 - Measurement Continued

Question 1

what is the equation for density?

Answer 1

mass (g)/volume (mL or CC)

Question 2

definition of specific gravity

Answer 2

a quantity that compares the density of a substance with the density of water at the same temperature

Question 3

what is the equation of specific gravity?

Answer 3

density of subtance (g/mL)/density of water (g/mL)

Question 4

the specific gravity of a substance is…

Answer 4

equal to its density but contains no units

Question 5

what are the steps of the cross-stitch method of converting units?

Answer 5

1. whatever is diagonal cancels out
2. add top exponents
3. subtract bottom exponents from the sum of top exponents

Question 6

how is heat measured?

Answer 6

(kinetic energy) how fast particles in something are moving

Question 7

equation to convert celsius to fahrenheit

Answer 7

F = 1.8(C) + 32

Question 8

equation to convert fahrenheit to celsius

Answer 8

C = (F + 32) / 1.8

Question 8

equation to convert celsius to kelvin

Answer 8

K = C + 273

Question 9

equation to convert kelvin to celsius

Answer 9

C = K - 273

Question 10

boiling, freezing, body temp, absolute zero of fahrenheit

Answer 10

boiling of water = 212 degrees
freezing of water = 32 degrees
(180 degree difference)
normal body temp = 98.6 degrees
absolute zero = -460 degrees

Question 11

boiling, freezing, body temp, absolute zero of celsius

Answer 11

boiling of water = 100 degrees
freezing of water = 0 degrees
(100 degree difference)
normal body temp = 37 degrees
absolute zero = -273 degrees

Question 12

boiling, freezing, absolute zero of kelvin

Answer 12

boiling of water = 373 k
freezing of water = 273 k
absolute zero = 0 k

Question 13

what is the rule for significant figures when adding/subtracting?

Answer 13

the answer should have the same number of decimal places as the limiting term (number with the least decimal places)

Question 14

what is the rule for significant figures when multiplying/dividing?

Answer 14

the answer should have the same number of significant figures as the limiting term (number with the least decimal places

Question 15

what is the density of water?

Answer 15

1.00 g/mL

Question 16

if specific gravity is less than 1…

Answer 16

it floats

Question 17

if specific gravity is equal to 1…

Answer 17

it sits

Question 18

if specific gravity is greater than 1…

Answer 18

it sinks

Question 19

if the exponent is negative…

Answer 19

move the decimal to the left

Question 20

if the exponent is positive…

Answer 20

move the decimal to the right