Percent Yield Exit Ticket

What is the definition of percent yield in chemistry?

• The maximum amount of product that can be produced in a reaction.

• The amount of product actually obtained compared to the theoretical yield, expressed as a percentage.

• The total mass of reactants used in a reaction.

• The ratio of reactants to products in a balanced chemical equation.

If a chemical reaction has a percent yield of 100%, what does this mean?

• The reaction was incomplete.

• No product was formed.

• The actual yield equals the theoretical yield.

• The reaction used excess reactants.

A reaction has a theoretical yield of 50g but produces only 40g of product. What is the percent yield?

• 20%

• 40%

• 80%

• 125%

In a reaction, the actual yield is greater than the theoretical yield. What is the most likely explanation?

• Measurement errors or contamination.

• The reaction produced an extra reactant.

• The limiting reactant was not used up.

• The reaction was perfectly efficient.

The decomposition of potassium chlorate produces 45g of oxygen gas, but the theoretical yield is 50g. What is the percent yield?

• 75%

• 85%

• 90%

• 95%

A student reacts 10g of magnesium with excess oxygen and produces 15g of magnesium oxide. The theoretical yield is 18g. What is the percent yield?

• 55.6%

• 72.2%

Which of the following factors could cause a reaction to have a percent yield less than 100%?

• Side reactions forming unwanted products.

• Loss of product during filtration or transfer.

• Impure reactants.

• All of the above.

In a reaction, 200g of a reactant is expected to produce 150g of product, but only 120g is obtained. What is the percent yield?

• 60%

• 75%

• 80%

• 90%

Why is it important to calculate percent yield in chemistry?

• To determine how efficient a reaction is.

• To predict the exact amount of product for any reaction.

• To always achieve a 100% yield.

• To determine the molar mass of reactants.

A student conducts a reaction expecting to produce 36g of water but only collects 27g. What is the percent yield?

• 50%

• 66.7%

• 75%

• 90%