24-25 Midterm Exam Review - Unit 5 & 6

Front

What is the term for the time it takes for 50% of the nuclei in a radioactive sample to decay?

Back

The half-life.

Front

What does the law of conservation of mass state?

Back

The total mass of the reactants before a chemical reaction is the same as the total mass of the products after the chemical reaction.

Front

What is the correct name for the chemical formula NO?

Back

Nitrogen Monoxide.

Front

What is evidence of a chemical reaction?

Back

A new substance has formed.

Front

What happens to atoms after a chemical reaction occurs?

Back

Atoms are just rearranged into a new substance.

Front

Define half-life in the context of radioactive decay.

Back

Half-life is the time required for half of the radioactive nuclei in a sample to decay.

Front

What is a chemical reaction?

Back

A process that leads to the transformation of one set of chemical substances to another.

Front

What is the significance of the law of conservation of mass in chemical reactions?

Back

It ensures that mass is neither created nor destroyed during a chemical reaction.

Front

What is the difference between a reactant and a product in a chemical reaction?

Back

Reactants are substances that start a chemical reaction, while products are substances formed as a result of the reaction.

Front

What is a new substance in the context of a chemical reaction?

Back

A substance that has different properties and composition from the reactants.