Chemistry Review 2024

Front

What happens to atoms during a chemical reaction?

Back

Atoms separate, rearrange, and new bonds form.

Front

What is a compound?

Back

A substance made of two or more different elements that are chemically bonded, e.g., water (H2O).

Front

What is evidence of a chemical change?

Back

The reaction produces heat.

Front

What are reactants in a chemical reaction?

Back

The starting substances that undergo change, e.g., 1 sodium and 2 chlorine in the reaction to form sodium chloride.

Front

What does the arrow in a chemical equation represent?

Back

It means 'forms', 'yields', or 'produces'; all of the answer choices are correct.

Front

What is the definition of a chemical reaction?

Back

A process where substances (reactants) transform into new substances (products).

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of only one type of atom, while a compound is made of two or more different types of atoms chemically bonded.

Front

What is a physical change?

Back

A change that affects one or more physical properties of a substance without altering its chemical composition.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed; it is conserved.

Front

What is a chemical equation?

Back

A symbolic representation of a chemical reaction, showing the reactants and products.