Chem 103- Module 1 Questions with Correct Answers

Chem 103- Module 1 Questions with
Correct Answers
accuracy - ANSWERSdescribes how close a measurement is to the actual value

precision - ANSWERSdescribes how closely repeated measurements agree with each
other

significant figures - ANSWERS1. all nonzero numbers are significant
2. zeros that appear between nonzero digits are significant
3. leading zeros are NOT significant
4. trailing zeros are significant IF there is a decimal point, but NOT significant if there is
not a decimal

adding/subtracting sig figs - ANSWERSleast number of decimal places

multiplying/dividing sig figs - ANSWERSleast number of sig figs

mega (M) - ANSWERS10^6

kilo (k) - ANSWERS10^3

centi (c) - ANSWERS10^-2

milli (m) - ANSWERS10^-3

micro (u) - ANSWERS10^-6

nano (n) - ANSWERS10^-9

Angstrom - ANSWERS10^-10

pico (p) - ANSWERS10^-12

density formula - ANSWERSdensity=mass/volume

measurement of density - ANSWERSg/cm3 or g/mL

extensive property - ANSWERSa property that depends on the amount of matter in a
sample, i.e. mass, volume

intensive property - ANSWERSa property that depends on the type of matter in a
sample, not the amount of matter, i.e. density