Check for Understanding

Last Name, First Name (Please CAPITALIZE the initial letter!)

In the equation, D = m/V, what does the "m" stand for?

• meters, m
• milli-, m
• mass, m
• metric, m

Which of the following are matched correctly? Select all that apply.

• density is measured in units of grams
• distance is measured in units of liters
• time is measured in units of seconds
• volume is measured in units of liters
• mass is measured in units of grams

The mass of a mole of NaCl is called the:

• molecular mass
• molar mass
• atomic mass
• gram atomic mass

The molar mass of NaCl is

• 58.44 grams
• 22.99 grams
• 35.45 grams
• 815 grams
• 58.44 amu

What SI unit is used to measure the number (count) of representative particles in a substance?

• ampere
• kilogram
• Kelvin
• mole

How many moles of Tungsten atoms are in 4.8 x 10^25 atoms of Tungston?

• 800 moles
• 0.013 moles
• 80 moles
• 0.13 moles

What is the molar mass of:

• 303.3 g/mol
• 102.9 g/mol
• 312.2 g/mol
• 74.1 g/mol

What is the molar mass of:

• 255.3 g/mol
• 102.9 g/mol
• 312.2 g/mol
• 74.1 g/mol

When performing dimensional analysis to convert units, how can you determine if you have used the correct conversion factor?

• It doesn't matter which one you use. Both will cause the units to cancel.
• If your conversion factor allows you to cancel the given unit and keep the unit you are trying to find
• When the unit you started with is on the top of both fractions
• When the unit you started with is on the bottom of both fractions