Midterm Review Chem

Which of the following is the appropriate way to dispose of a chemical used in a lab activity?

• flush the used chemical down the drain with at least 100 times the volume of tap water

• dump the used chemical in a specially designed waste container

• discard the used chemical in a trash can

• refer to and follow the lab instructions. The disposal will differ based on the chemical properties

Write the following in scientific notation:

835,000

• 8.35 x 10⁵

• 83.5 x 10⁴

• 8.35 x 10⁶

• 8.35 x 10⁴

An over the counter medicine has 375 mg of its active ingredients per tablet. How many grams does this mass represent?

• 37.5 g

• 0.375 g

• 37,500 g

• 3.75 g

Convert 45.3 hectoliters to liters.

• 453 L

• 4,530 L

• 4.53 L

• 0.453 L

How many significant figures are in the following number:

75.900?

• 3

• 4

• 5

• 2

What is the name of the following covalent compound? Cl₂O₇

• dichlorine heptoxide

• chlorine heptoxide

• dichlorine hexoxide

• chlorine oxide

The lowest point on a wave.

• frequency

• wavelength

• amplitude

• trough

How many significant figures are in the following number:

503?

• 1

• 2

• 3

• 4

Air (78% nitrogen, 21 % oxygen, 1% other) is an example of which of the following?

• element

• compound

• homogeneous mixture

• heterogeneous mixture

A diamond (pure carbon) is an example of which of the following?

• element

• compound

• homogeneous mixture

• heterogeneous mixture