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
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
