Unit 1

Non-zero digits are _______ significant

• ALWAYS

• NEVER

Answer explanation

For example: 326 has 3 significant figues since it has 3 Non-zero numbers

Zeros between two non-zero digits are NEVER significant

• True

• False

Answer explanation

Zero's between two non-zero digits are ALWAYS significant. For example: 303 has 3 sig figs since it has a zero in between two non zero digits.

Leadings Zeros are _________ significant

• ALWAYS

• NEVER

Answer explanation

For example 0.003003 only has 4 sig figs because of the 3's and the two 0's between the 3's

Trailing zeros are not significant even if there is a decimal point.

• True

• False

Answer explanation

Trailing zeros are significant IF their is a decimal point. For example 30.00 has 4 sig figs while 300 has only one sig fig. The only difference is the decimal point.

Exact numbers have an infinite number of sig figs

• True

• False

Answer explanation

Ex Counting: 12 bodies -> 12.0 bodies -> 12.00 bodies

Ex Def/Conversions: 1 day=24 hours -> 1 day=24.0 hours -> 1 day= 24.00000 hours

How many sig figs are there?

30.20

• 1

• 2

• 3

• 4

How many sig figs are there?

2.50 x 10⁶

• 1

• 2

• 3

• 4

Answer explanation

Scientific Notation Nx10^x: N: follows the rules. But 10^x does not therefore 10^6 is not significant. Therefore it is 3 sig figs

11.2 + 5.213 = ?

• 16.413

• 16.41

• 16.4

• 16

Answer explanation

The number of place values in the answer is the same as the least accurate number in the problem

How many sig figs are there?

3.00 x 2

• 1

• 2

• 3

• 4

Answer explanation

The number of significant figures in the answer is the least number of significant figures in the problem. For example 3.0 x 2.00= 6.0 therefore it is 2sf

(0.06+3.014)/4.1= ?

• 0.7497

• 0.750

• 0.75

• 0.7