Unit 2 Review-Chemistry

Convert to scientific notation:

7,800,000

• 7.8 x 10⁶

• 7.8 x 10⁵

• 78 x 10⁶

• 0.78 x 10⁷

Take the following out of scientific notation:

4.678 x 10⁸

• 476800000

• 467800000

• 460000000

• 46780000

True or False: When measuring you can have more than one digit of uncertainty.

• True

• False

Which of the following types of zeros DO NOT count as significant figures?

• Zeros after a number with a decimal place

• Zeros after a decimal place

• Trapped zeros

• Leading zeros

How many significant figures are in the following number?

5.0900

• 5

• 2

• 3

• 4

How many significant figures are in the following number?

6,204,000

• 3

• 4

• 7

• 5

How many significant figures are in the following number?

0.0030890

• 4

• 7

• 5

• 3

What is the formula for density?

• D=m/v

• D=m*v

• D=1/m*v

Calculate the density of an object that is 5.0 grams and takes up 10. mL of space.

• 0.5 g*mL

• 0.50 g*mL

• 0.5 g/mL

• 0.50 g/mL

How many apps are in 0.98 computers?

1 computer = 4.32 apps

• 4.23

• 4.2

• 0.23

• 0.227