Ch.3 Chem Vocab

Front 1

Avogadro's Number

Back 1

6.02×1023

Front 2

Standard notation

Back 2

Expressing numbers the usual way, with decimals

Front 3

Exponential notation

Back 3

Expressing large/small numbers as the product of a number and a power of ten

Front 4

Scientific notation

Back 4

Expressing large/small numbers as the product of a number (between 1 and 10) and a power of ten

Front 5

Accurate measurement

Back 5

When an undamaged instrument is used correctly

Front 6

Uncertainty in a measurement

Back 6

The last digit is uncertain or estimated

Front 7

Significant digits (Sig Figs)

Back 7

The number of digits in a measurement: all the certain digits plus just one uncertain digit

Front 8

Significant digits and zeros

Back 8

Zeros used to locate the decimal are not significant

Front 9

Degree of precision

Back 9

Expressed either

1) as the number of sig. fig.s,

or

2) the 'place' of the uncertain digit in a measurement eg. hundredths of a cm

Front 10

Infinite significant figures

Back 10

Numbers with no uncertainty

eg. 1 dozen=12

Front 11

Rounding rule for +/- measurements

Back 11

Sum vertically, keep 1 uncertain digit only

Front 12

Scale on a graph

Back 12

Counting by 2s, 5s, 10s, etc.

Front 13

Units on a graph

Back 13

Written after the quantity of measure eg. Temperature (°C)

Front 14

Title on a graph

Back 14

Describes concisely; often x versus y quantities

Front 15

Slope of a graph

Back 15

Rise over run

Front 16

Best fit line

Back 16

Equal number of data points on either side of the line

Front 17

Best fit curve

Back 17

Smooth curve through most of the data points

Front 18

Rounding rule of ×/÷ measurements

Back 18

Answer is the same number of sig figs as the least precise measurement used in the calculation