Unit 5 Review- Reactions and the Mole

Front

What is a chemical reaction?

Back

A process in which substances (reactants) undergo a transformation to form new substances (products).

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; the total mass of reactants equals the total mass of products.

Front

What is a mole in chemistry?

Back

A mole is a unit that measures the amount of substance, defined as containing exactly 6.022 x 10^23 particles (atoms, molecules, etc.).

Front

How do you calculate the number of molecules in a given number of moles?

Back

Multiply the number of moles by Avogadro's number (6.022 x 10^23).

Front

What is molar mass?

Back

The mass of one mole of a substance, typically expressed in grams per mole (g/mol).

Front

How do you balance a chemical equation?

Back

Adjust the coefficients of the reactants and products to ensure the same number of each type of atom on both sides of the equation.

Front

What is the difference between an endothermic and exothermic reaction?

Back

Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat.

Front

What is a precipitate?

Back

A solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What are the units for molar mass?

Back

Grams per mole (g/mol).

Front

What is the significance of Avogadro's number?

Back

It allows chemists to convert between moles and number of particles, facilitating calculations in chemical reactions.