Chemistry - Practice Final Exam

Front

What is a limiting reagent?

Back

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

Front

What phase change requires the greatest amount of energy to be absorbed?

Back

The phase change from liquid to gas requires the greatest amount of energy to be absorbed.

Front

How many carbon atoms are in 1 mole of methane (CH₄)?

Back

There are 6.02 x 10²³ carbon atoms in 1 mole of methane.

Front

What type of reaction occurs when a heat pack releases heat?

Back

An exothermic reaction occurs when a heat pack releases heat.

Front

Which product is insoluble in the reaction (NH₄)₂Cr₂O₇(aq) + Ca(OH)₂(aq) --> 2 NH₄OH ( ? ) + CaCr₂O₇ ( ? )?

Back

CaCr₂O₇ is the insoluble product.

Front

Define an exothermic reaction.

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat.

Front

What is the significance of the mole in chemistry?

Back

The mole is a unit that measures the amount of substance, allowing chemists to count particles by weighing them.

Front

What is the formula for calculating moles from mass?

Back

Moles = mass (g) / molar mass (g/mol).

Front

What is solubility?

Back

Solubility is the ability of a substance to dissolve in a solvent at a given temperature and pressure.

Front

What is the difference between an endothermic and exothermic reaction?

Back

An endothermic reaction absorbs heat, while an exothermic reaction releases heat.