SI Unit Notes

Question 1

SI System of Measurement

Answer 1

units scientists have agreed to communicate with

Question 2

SI Unit for Length

fundamental unit

Answer 2

meter (m)

Question 3

SI Unit for Mass

fundamental unit

Answer 3

kilogram (kg)

Question 4

SI Unit for Time

fundamental unit

Answer 4

second (s)

Question 5

SI Unit for Amount

fundamental unit

Answer 5

mole (mol)

Question 6

SI Unit for Temperature

fundamental unit

Answer 6

kelvin (K)

The symbol is a capital K

Question 7

Derived SI Units

Answer 7

Units that are calculated from one or more of the fundamental units

Question 8

SI Unit of Volume

derived unit

Answer 8

cubic centimeters (cm^3) or millileters (mL)

length * width * height

Question 9

Density Equation

Answer 9

mass (g) / volume (mL/cm^3)

Question 10

Density Unit

Answer 10

g/mL or g/cm^3

Question 11

Significant Figures

Answer 11

all digits that are measured +1 that is estimated

the +1 estimated is the final digit, which is rounded or created (0)

Question 12

Rules of Sig. Figs.

Answer 12

1. All non-zeros are significant (1-9)
2. Final zeros after a decimal point are significant (12.10 = 4 sf)
3. Zeros to the right of the decimal but to the left of non-zeros are not significant (.05 = 1 sf)
4. final zeros before a decimal are significant if the decimal point is to the left of it (120 = 2 sf, 120. = 3 sf)
5. Digits inbetween 2 sig figs are significant (102 = 3 sf)
6. Zeros before a number are not significant (0.52 = 2 sf, .52 = 2 sf)

Question 13

Multiplication/Division with Sig Figs

Answer 13

Round answers to match the amount of digits with the number that has the least sig figs

Question 14

Addition/Subtraction with Sig Figs

Answer 14

Round answers to match the number with the least amount of decimal spaces.

Question 15

Unit Conversion