Topic 9 Chemical Reactions Review

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

What is a catalyst?

Back

A catalyst is a substance that speeds up a chemical reaction without being consumed in the process.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction.

Front

How many fluorine (F) atoms are in 6MgF2?

Back

There are 12 fluorine (F) atoms in 6MgF2.

Front

What is a closed system in chemistry?

Back

A closed system is one where no matter enters or leaves, but energy can be exchanged.

Front

What is an open system in chemistry?

Back

An open system is one where both matter and energy can be exchanged with the surroundings.

Front

What happens to mass in a chemical reaction in an open container?

Back

In an open container, gases produced may escape, leading to a loss of mass that cannot be measured.

Front

What is a reactant?

Back

A reactant is a substance that undergoes a chemical change in a reaction.

Front

What is the role of energy in chemical reactions?

Back

Energy is required to break bonds in reactants and is released when new bonds form in products.

Front

What is an exothermic reaction?

Back

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