Physical and Chemical Changes Quiz

A process where a substance changes its form or appearance but doesn't change its chemical composition.

A chemical change alters the substance's chemical composition, creating a new substance with different properties.

A temporary change where no new substance is formed, and the original substance can usually be recovered.

A permanent change where a new substance with different properties is formed.

Melting wax is a physical change because the wax changes state (solid to liquid) but its chemical composition remains the same.

Burning paper is a chemical change because the paper reacts with oxygen, producing ash, smoke, and gases - all new substances with different properties.

Dissolving salt in water is a physical change because the salt particles get surrounded by water molecules, but their chemical composition doesn't change. You can evaporate the water and get the salt back.

Spoiling food is a chemical change because bacteria and enzymes break down the food's molecules, altering its chemical makeup and leading to changes in smell, taste, and appearance.

A change in which the original substances are still there and no new substances are formed. The change is often temporary and can be reversed.

A change in which a new substance is formed with different properties than the original substances. This change is usually permanent and cannot be reversed

A change in which a substance gains or loses heat energy, causing a change in temperature or state of matter.

A change that produces light energy, such as a burning candle or a light bulb.

A change that causes a substance to gain magnetic properties, like when an iron wire is rubbed with a magnet.

A change resulting in the production of a new substance with distinct properties.

When a substance undergoes a physical change, the total mass of the substance remains constant.

Examples of physical changes where the substance can return to its original state.

Examples of physical changes where the substance undergoes a permanent change of state.

Evaporation is a physical change where a liquid turns into vapor, like water turning into steam.

Solid turning into liquid, like ice turning into water.

Liquid turning into solid, like water turning into ice.

The process of a gas turning into a liquid, like clouds forming.

A change in a substance where the composition of its molecules remains the same. The change is temporary and can be reversed. For example, melting ice into water, a physical change has taken place, but the molecules of water remain the same.

A change in a substance that produces new molecules with entirely different properties. The change is permanent and cannot be reversed. For example, burning paper produces ash and smoke, which cannot be transformed back into paper.

A chemical change where a substance is broken down into simpler substances. This is usually caused by heat.

This is the process of changing a liquid into a gas. It happens when a liquid is heated.

This is the change from a gas back to a liquid. This happens when a gas cools.

This is the process of changing a solid into a liquid. It happens when a solid is heated.

This is the process of changing a liquid into a solid. It happens when a liquid is cooled.

This is a change where the appearance or form of a substance is altered but its composition remains the same. For instance, chopping wood is a physical change. The state of the wood changes, but its chemical makeup stays the same.

The temperature at which a solid changes into a liquid at atmospheric pressure.

The process in which a liquid changes rapidly into a gas on heating.

The temperature at which a liquid boils and changes rapidly into a gas at atmospheric pressure.

The force of attraction between particles in a solid. Stronger force leads to higher melting point.

A chemical change often involves a change in mass. This happens because new substances are formed.

Chemical changes usually involve the release or absorption of heat, also known as energy.

Cooking food is a chemical change that alters the food's composition and properties, making it safe to eat and digestible.

Rusting is a chemical change where iron reacts with oxygen to form iron oxide, a new substance with different properties.

Fermentation is a chemical change where sugar is converted into alcohol by microorganisms.

The process of respiration, where oxygen is consumed and carbon dioxide is released, is a chemical change within our bodies.