AS Chemistry Spring Final Review

With respect to significant figures, what is the result of the following density calculation?

30.00 g ÷ 12.0 mL

• 3 g/mL

• 2.5 g/mL

• 2.50 g/mL

• 2.500 g/mL

What is the molar mass of Ca(OH)₂?

• 74.10 g/mol

• 58.10 g/mol

• 114.18 g/mol

• 97.17 g/mol

What is the percent composition of oxygen in H₂O?

• 97.15%

• 88.79%

• 16.00%

• 11.21%

Ribulose has an empirical formula of CH₂O and a molar mass of about 150 g/mol. What is the molecular formula?

• C₆H₁₂O₆

• C₄H₂O₆

• C₆H₁₆O₄

• C₅H₁₀O₅

Tags

NGSS.HS-LS1-6

Ammonia can be synthesized through the following reaction.

N₂ + 3 H₂ --> 2 NH₃

In the time it takes 1.50 moles of ammonia to form, how many moles of hydrogen gas would we use?

• 2.25 mol

• 3.00 mol

• 2.00 mol

• 2.67 mol

A campfire will burn until all the wood is gone. What ingredient is considered to be the excess reactant in this situation?

• Wood

• Oxygen

• Carbon Dioxide

• Water Vapor

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which of the following is not a reason why percent yield is less than 100%

• The reaction reaches equilibrium instead of going to completion.

• The measured reactants contained impurities.

• The collected products contain impurities.

• Some product was lost while attempting to purify it.

What is 25 °C converted to Kelvin?

• -248 K

• 248 K

• 273 K

• 298 K

Which of the following would decrease when the temperature of a gas in a fixed volume container is decreased?

• The density of the gas in the container

• The moles of gas in the container

• The pressure of the gas in the container

• The size of the gas particles in the container

If the volume of a gas is halved at constant temperature, what happens to the pressure?

• The pressure is doubled

• The pressure is halved

• The pressure stays the same

• The pressure is tripled