Science Quiz - Unit Conversions, Sig Figs, Prefixes, etc.

a quantity that has both a number and a unit

a measure of how close a measurement comes to the actual/true value of whatever is measured

a measure of how close a series of measurements are to one another

Accuracy (example)

Precision (example)

the absolute value of the difference between the experimental value and the accepted value

the absolute value of the quantity of the difference between the EV and the AV divided by the AV multiplied by 100

Error equation

Error percentage

a measurement include all of the digits that are known plus a last digit that is estimated; can relate the certainty of the measurement to the precision of the experiment.

Find the first non-zero number starting from the left and count all numbers to the right, no leading zeros, trailing zeros are always sig figs with decimal point, and captive zeros are counted.

(1<#<9) x 10^n

4.73 x 10^1

2.1 x 10^-3

Align decimal points and round the #s to the measurement with the least amount of decimal places.

369.8 or 3.698 x 10^2

G, 10^9, 1,000,000,000

M, 10^6, 1,000,000

k, 10^3, 1,000

d, 10^-1, 0.1

c, 10^-2, 0.01

m, 10^-3, 0.001

μ, 10^-6, 0.000,001

n, 10^-9, 0.000,000,001

p, 10^-12, 0.000,000,000,001

kg

m

s

Kelvin (K)

Mole (mol)

Ampere (A)

candela (ca)

cubic meter (m^3)

Newton (N)

Watt (W)

volt (V)

ohm (Ω)

Hertz (Hz)