Reg Chem Unit 2 test

If you wanted to measure the length of a school bus, the best SI unit to use is the

• liter

• meter

• millimeter

• kilometer

Write 78,900,000 in scientific notation.

• 79 x 10⁶

• 78.9 x 10⁶

• 789 x 10⁵

• 7.89 x 10⁷

The formula for density is

• D = m/v

• D = v/m

• D = mv

• D = m + v

Write 0.00043 in scientific notation.

• 43 x 10⁵

• 4.3 x 10^-4

• 43 x 10^-5

• 4.3 x 10⁴

What is the mass of an item that has a density of 4 g/mL and a volume 5 mL

• 1.25 g/mL

• 1 g/mL

• 9 g/mL

• 20 g/mL

How many significant figures are in 901,000

• 6

• 5

• 4

• 3

What is the density of an object with a mass of 44 g and a volume of 33 mL?

• 1.3 g/mL

• 11 g/ml

• 77 g/mL

• 1452 g/mL

You take measurements. They are very close together. They are not near the accepted value. The measurements are

• accurate but not precise

• precise but not accurate

• accurate and precise

• none of these

2.3 L is the same as

• 23 mL

• 0.0023 mL

• 230 mL

• 2300 mL

A measurement that is close to the accepted value has

• accuracy

• precision

• significant

• none of these