Unit 2

Front

What is a chemical reaction?

Back

A chemical reaction is a process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What happens to the temperature during an exothermic reaction?

Back

In an exothermic reaction, the temperature increases because heat is released.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

What is a physical change?

Back

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

Front

What is a chemical change?

Back

A chemical change is a change that results in the formation of new chemical substances.

Front

What is a solution?

Back

A solution is a homogeneous mixture of two or more substances, where one substance (the solute) is dissolved in another (the solvent).

Front

What is the role of a catalyst in a chemical reaction?

Back

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

Front

What is an indicator in chemistry?

Back

An indicator is a substance that changes color in response to a chemical change, often used to determine the pH of a solution.

Front

What is the difference between an acid and a base?

Back

Acids are substances that donate protons (H+) in a solution, while bases are substances that accept protons.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.