Understanding Matter and Its Changes

What is the definition of matter?

• Matter is anything that has mass and occupies space.

• Matter is the absence of space.

• Matter is anything that can be seen or touched.

• Matter is a type of energy.

What is a physical change? Give an example.

• Dissolving sugar in water.

• Melting ice into water.

• Boiling water into steam.

• Breaking a glass into pieces.

What is a chemical change? Provide an example.

• Boiling water to steam

• Dissolving sugar in water

• An example of a chemical change is the rusting of iron, where iron reacts with oxygen to form iron oxide.

• Melting ice into water

List three properties of matter.

• Temperature, pressure, speed

• Color, shape, texture

• Mass, volume, density

• Weight, size, state

How can matter be classified?

• Matter can be classified as organic and inorganic only.

• Matter can be classified as pure substances (elements and compounds) and mixtures (homogeneous and heterogeneous).

• Matter can only be classified as solids and liquids.

• Matter is classified based on its color and size.

What happens to the state of matter during a physical change?

• The state of matter can only change from solid to liquid.

• The state of matter can change, but the chemical composition remains the same.

• The state of matter changes and the chemical composition also changes.

• The state of matter remains unchanged during a physical change.

What are some indicators of a chemical change?

• Dissolving sugar in water

• Evaporation of water

• Indicators of a chemical change include gas production, color change, precipitate formation, temperature change, and energy change.

• Melting of ice

Explain the difference between an element and a compound.

• An element is a single type of atom, while a compound is a combination of two or more different elements.

• An element can be made of multiple types of atoms, while a compound is a single type of atom.

• Elements can be broken down into simpler substances, while compounds cannot.

• A compound is always a gas, while an element can be a solid or liquid.

What is the law of conservation of mass in relation to chemical changes?

• Mass is only conserved in physical changes.

• The total mass remains constant during chemical changes.

• The total mass increases during chemical changes.

• Mass can be created during chemical reactions.

How do temperature and pressure affect the state of matter?

• Pressure has no effect on the state of matter.

• Temperature increases can lead to melting and evaporation, while pressure increases can lead to condensation and solidification.

• Temperature decreases always lead to solidification.

• Increasing temperature always results in condensation.