Chemistry NCFE 2018-19 #29-40

Front

What happens when potassium chloride (KCl) dissolves in water?

Back

Water molecules exert forces of attraction that break the potassium chloride apart into potassium ions and chloride ions.

Front

What does it indicate if a liquid feels slippery and turns red litmus paper blue?

Back

The substance is likely a base.

Front

How do you calculate the molarity of a solution in a titration?

Back

Molarity (M) = (Molarity of titrant * Volume of titrant) / Volume of analyte.

Front

What is a key indicator that a chemical reaction has occurred?

Back

A new substance is formed.

Front

Why does increasing temperature usually increase the rate of a chemical reaction?

Back

Because the number of effective collisions between reacting particles increases.

Front

What is the definition of a base in chemistry?

Back

A substance that accepts protons (H+) or donates electron pairs.

Front

What is the definition of an acid in chemistry?

Back

A substance that donates protons (H+) or accepts electron pairs.

Front

What is the role of activation energy in a chemical reaction?

Back

It is the minimum energy required for a reaction to occur.

Front

What is a neutralization reaction?

Back

A reaction between an acid and a base that produces water and a salt.

Front

What is the significance of the pH scale?

Back

It measures the acidity or basicity of a solution.