Ch 2

Question 1

SI Units

Answer 1

International System/Metric system

Question 2

Mass is measured in ______
Length is measured in ______
Time is measured in ______
Temperature is measured in ______

Answer 2

Kg
m-meters
Seconds
Kelvin

Question 3

Mega-M-_________
Kilo-k-__________
Deci-d- ________
Centi-c-_________
Milli-m-________
Micro-µ-________
Nano-n-________

Answer 3

1 million
1000
.1
.01
.001
Millionth
Billionth

Question 4

Volume is derived from____.
1L=
mL=____=____
How many times smaller is a mL

Answer 4

Length.
1L=1dm^3
1cc=1cm^3
1000X

Question 5

____ measurements have some uncertainty.
____ number is always an estimate.
Rule for uncertainty in measurements?

Answer 5

Record all certain numbers plus first uncertain number

Question 6

Beginning Zeros are _____ significant
Middle Zeros are _____ significant
End Zeros are only significant______
Ex: 2.60 x 10^4 = sig figs?

Answer 6

Never
Always
In numbers with a decimal point
3

Question 7

Rule for sig figs when multiplying and dividing
6.234 x 1.98 = 12.34332 round to?
622/2.5= 248.8?

Answer 7

Answer should have same sig figs as the original number with the least amount
12.3
250

Question 8

Rule for sig figs when adding and subtracting
6.12+1.5+0.755=8.375

Answer 8

Answer should match least decimal places in original numbers
8.4

Question 9

Dimensional analysis aka
Remember write the ______
Sig figs?

Answer 9

Converting units of measurement
write the units
Same amount as original number

Question 10

What scale has an absolute zero? What is its symbol, freezing, and boiling point of water on this scale
Absolute zero is when ____

Answer 10

Kelvin, K, 273 K, 373 K
Molecular motion stops

Question 11

Density=
Measured in ?

Answer 11

M/V
Grams (usually)

Question 12

A=
Z=

Answer 12

Mass number (protons+neutrons)
Atomic number (protons)

Question 13

What makes Mixture different than a compound

Answer 13

Compounds can’t be separated by physical means