Chemistry Semester 1 Review 2023

Front

What is a half-life?

Back

The time required for half of the radioactive atoms in a sample to decay.

Front

How much of an isotope remains after 2 half-lives?

Back

25% of the original amount.

Front

What is a physical property?

Back

A characteristic of a substance that can be observed without changing its chemical composition, such as freezing point.

Front

What is a chemical property?

Back

A characteristic that can only be observed during a chemical reaction, such as reactivity with acid.

Front

What is the difference between extensive and intensive properties?

Back

Extensive properties depend on the amount of substance (e.g., mass, volume), while intensive properties do not (e.g., density, boiling point).

Front

What are nonpolar bonds?

Back

Bonds where electrons are shared equally between atoms, resulting in no charge separation.

Front

Which pair has the most nonpolar bonds?

Back

Chlorine to chlorine.

Front

What is a catalyst?

Back

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

Front

Where is a catalyst written in a chemical equation?

Back

Above the arrow.

Front

What is the formula for disulfur heptachloride?

Back

S₂Cl₇.