Understanding Matter and Its Properties

What is the main difference between weight and mass?

• Weight is a measure of how much matter an object has, while mass is a measure of the gravitational force on an object.

• Mass is a measure of how much matter an object has, while weight is a measure of the gravitational force on an object.

• Weight can only be measured in kilograms, while mass can be measured in pounds.

• There is no difference; weight and mass are the same thing.

What does the law of conservation of mass state?

• Mass can neither be created nor destroyed, but it can change forms.

• Mass can be created during chemical reactions.

• The mass of products in a chemical reaction is always less than the mass of the reactants.

• Mass increases in an isolated system over time.

Which of the following best describes an atom?

• A combination of two or more different elements.

• The smallest unit of a chemical element that retains its chemical properties.

• A substance that cannot be broken down into simpler substances.

• A group of atoms bonded together.

What is a molecule?

• A type of atom.

• A single unit of an element.

• A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

• A pure substance that cannot be broken down.

An element is best described as:

• A substance made of two or more different types of atoms.

• A substance that can be broken down into simpler substances by chemical means.

• A substance that cannot be broken down into simpler substances by chemical means.

• A mixture of two or more substances.

What defines a compound?

• A substance made up of atoms of two or more different elements joined by chemical bonds.

• A collection of identical atoms.

• A mixture of different molecules.

• A single type of atom.

Which of the following is an example of a physical property?

• Flammability

• Reactivity with vinegar

• Color

• Ability to rust

Identify a chemical property from the following options.

• Density

• Boiling point

• Reactivity with water

• Mass

How do you calculate the density of an object?

• Divide its mass by its volume.

• Multiply its mass by its volume.

• Divide its volume by its mass.

• Add its mass to its volume.

Which of the following is an example of a physical change?

• Burning wood

• Dissolving salt in water

• Rusting of iron

• Milk souring