S2 Final Review

Front

What is a limiting reagent in a chemical reaction?

Back

The limiting reagent is the reactant that is completely consumed first in a chemical reaction, limiting the amount of product formed.

Front

Given the reaction Mg + 2HCl → MgCl2 + H2, which reactant is the limiting reagent if 6.00 moles of HCl and 5.00 moles of Mg are used?

Back

HCl is the limiting reagent because it will be consumed before Mg.

Front

What is a half-reaction in electrochemistry?

Back

A half-reaction is either the oxidation or reduction part of a redox reaction, showing the transfer of electrons.

Front

In the half-reaction Cu²⁺ + 2e⁻ → Cu, what is happening to copper?

Back

Copper is being reduced as it gains electrons.

Front

What is percent yield in a chemical reaction?

Back

Percent yield is the ratio of the actual yield to the theoretical yield, multiplied by 100.

Front

If a reaction predicts a yield of 32.4 grams but only 26.1 grams are produced, what is the percent yield?

Back

The percent yield is 80.6%.

Front

What is the half-life of a radioactive substance?

Back

The half-life is the time required for half of the radioactive atoms in a sample to decay.

Front

If Barium-122 has a half-life of 2 minutes, how much will remain after 10 minutes if starting with 80 g?

Back

2.5 g of Barium-122 will remain after 10 minutes.

Front

What does it mean for a species to be reduced in a redox reaction?

Back

A species is reduced when it gains electrons, resulting in a decrease in oxidation state.

Front

In the electrochemical cell Co³⁺ | Co²⁺ and Cl₂ | Cl⁻, which species is reduced?

Back

Co³⁺ is reduced.