Chapter 4: How Chemists Use Numbers Flashcards
What is the SI unit of time?
seconds
what is the SI unit of mass?
grams
what is the SI unit of temperature?
Kelvin
what is the SI unit of length?
meters
what is the SI unit of volume?
liters
1 kg = ___ g
1,000
1 g = ____ cg
100
1 g = ____ mg
1,000
1 g = ____ micrograms
10^6
1 g = ____ nanograms
10^9
what measures the amount of matter in an object?
mass
T/F: mass is the same thing as weight
false
are leadings zeros significant?
no (they serve as placeholders)
are trailing zeros WITH a decimal point significant?
yes
are “sandwiched” zeros significant?
yes
when you multiply or divide, the sigfigs if your final answer equal:
the amount of sigfigs in the smallest amount from the problem
when you add or subtract, the sigfigs in your final answer equal:
the amount of sigfigs in the smallest amount from the problem
1 cm^3= ___ mL
1 mL
1 cc= ____mL
1 mL
1 in = ____ cm
2.54 cm
density=
mass/volume
bricks are ____ dense than feathers
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