Unit 6 Exam

The limiting reactant

• slows the reaction down
• is used up first
• is the reactant that is left over
• controls the speed of the reaction

Use the equation 2 Al + 3 Cl₂ ---> 2 AlCl₃.  If 2 moles of aluminum and 2 moles of chlorine are reacted, identify the limiting reactant.

• AlCl3

• Cl2

• Al

When does a chemical reaction stop?

• When the lab is finished

• When all the reactants are used up

• When the limiting reactant is used up

• Chemical reactions never stop

Some of the Reactants might stick to the sides of containers causing actual yield to be less than theoretical yield.

• true

• false

The amount of product in a reaction recorded in a data table during an experiment is _____________.

• the actual yield

• the theoretical yield

• the percent yield

• the stoichiometric value

The amount of product calculated to be produced in a reaction is the _______.

• percent yield

• theoretical yield

• actual yield

• stoichiometric value

The ratio of calculated amount of product and experimental amount of product is known as the ____ .

• stoichiometric value

• actual yield

• theoretical yield

• percent yield

When calculating percent yield, what units must be included in your answer?

• % only

• grams or moles

• grams only

• moles only

What does the molar mass allow you to do?

• add the number of atoms of each element

• convert between units of mass and the amount of moles

• add the mass of all the atoms in a formula

What are the units of molar mass?

• grams

• moles

• grams per mole

• liters