Chemical Changes

Front

What is a chemical change?

Back

A chemical change is a process where one or more substances are transformed into new substances with different properties.

Front

What are some signs of a chemical reaction?

Back

Signs of a chemical reaction include change in color, production of gas bubbles, formation of a precipitate, and change in temperature.

Front

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

Back

A chemical change results in the formation of new substances, while a physical change does not change the substance's chemical identity.

Front

What happens to the molecules during a chemical change?

Back

During a chemical change, the bonds between molecules are broken and new bonds are formed, resulting in new substances.

Front

What is an example of a chemical change?

Back

Examples of chemical changes include rusting of iron, burning wood, and baking a cake.

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

Is melting ice a chemical or physical change?

Back

Melting ice is a physical change because it changes from solid to liquid without forming a new substance.

Front

What is the role of energy in chemical changes?

Back

Energy is often absorbed or released during a chemical change, which can cause temperature changes or the production of light.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a type of chemical reaction that absorbs energy from its surroundings, usually in the form of heat.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy, usually in the form of heat or light.