Chemistry NCFE Released Questions

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.

Front

What happens to sodium hydroxide (NaOH) when it dissolves in water?

Back

It dissociates into sodium ions (Na+) and hydroxide ions (OH-), forming an electrolytic solution.

Front

What is the gaseous state of matter?

Back

A state of matter where particles are far apart and move freely, filling the volume of their container.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another, often involving the formation of new substances.

Front

What are cations and anions?

Back

Cations are positively charged ions, while anions are negatively charged ions.

Front

What is the critical point in a phase diagram?

Back

The temperature and pressure at which the distinction between liquid and gas phases disappears.

Front

What is the triple point of a substance?

Back

The unique set of conditions at which all three phases (solid, liquid, gas) coexist in equilibrium.

Front

What is an electrolytic solution?

Back

A solution that conducts electricity due to the presence of free ions.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the significance of a new substance being formed in a chemical reaction?

Back

It indicates that a chemical change has occurred, which is a key characteristic of chemical reactions.