2nd Semester Chemistry Review Pt1

The burning of wood, coal, oil, and natural gas adds which greenhouse gas to the atmosphere?

• Oxygen gas

• Carbon dioxide

• Ozone

• Chloro-fluorocarbons

When no coefficient is written in front of a chemical formula in an equation

• it is assumed to be zero

• it is assumed to be one

• the formula is a catalyst

• the equation is not balanced yet

6.02 x 10²³ particles is the same as

• one molecule

• one mole

• one atom

• one gram

Robert has a dozen doughnuts, which means that he has 12 doughnuts. If he had one mole of doughnuts, how many would he have?

• 6.02 x 10²³

• 12

• 72

• impossible to calculate

One mole of glucose is equal to 180 grams. How many molecules are in 180 grams of glucose?

• 6.02 x 10²³

• 12.01 x 10²³

• 30

• 180

What is the mass of a sample that contains Exactly two moles of Aluminum (Al)?

• 53.96 g

• 13.00 g

• 26.00 g

• 26.98 g

In a sample of one mole of a substance, the number of atoms or molecules

• is equal to 6.02 x 10²³

• varies as the temperature changes

• varies depending as pressure changes

• is dependent on density

The mineral magnetite has the chemical formula Fe₃O₄. Which of these is closest to the molar mass of magnetite?

• 34 g/mole

• 72 g/mole

• 110 g/mole

• 232 g/mole

Which of the following has a greater mass?

One mole of gaseous carbon dioxide (CO₂)

One mole of frozen water molecules (H₂O)

• H₂O

• CO₂

• The samples have the same weight

• there is not enough information to determine the answer

What is the coefficient needed for hydrogen in the chemical reaction

N₂ + H₂ --> 2 NH₃

• 1

• 2

• 3

• 4