1.3, 1.4

Question 1

state the 7 SI base units

Answer 1

mass
length
time
temperature
amount of substance
electric current
luminous intensity

Question 2

mass
length
time
temperature
amount of substance
electric current
luminous intensity

Answer 2

kilogram (kg)
meter (m)
second (s)
kelvin (K)
mole (mol)
ampere (A)
candela (cd)

Question 3

1 L =

Answer 3

1dm^3 = 10^-3 m^3

Question 4

1cm^3 =

Answer 4

1mL = 10^-3 dm^3 = 10^-3L = 10^-6m^3

Question 5

Celsius scale

Answer 5

water freezes at 0 and boils at 100

Question 6

Kelvin scale

Answer 6

water freezes at +273.15K and boils at +373.15K

Question 7

Fahrenheit

Answer 7

water freezes at 32 and boils at 212

Question 8

converting between the 3 temperature measures

Answer 8

F = 9/5C + 32
K = C + 273.15

Question 9

how do you deal with significant figures in calculations?

Answer 9

1. for multiplication/division: answer has same no of SFs as measurement w least SFs
2. addition/subtraction: answer has the same no of DPs as measurement with fewest DPs
3. always carry one or two additional significant figures through a multistep calculation and round off the final answer only

Question 10

precision

Answer 10

how close values are to each other

Question 11

accuracy

Answer 11

how close values are to the actual value

Question 12

systematic errors give

Answer 12

values that are either all higher or all lower than the actual value

Question 13

random errors give

Answer 13

some values that are higher and some that are lower than the actual value

Question 14

precise measurements have low

Answer 14

random error

Question 15

accurate measurements have low

Answer 15

systematic error and random error

Question 16

a systematic error is often caused by

Answer 16

faulty equipment

Question 17

how can we compensate for a systematic error

Answer 17

by calibration