Understanding Matter and Its Transformations

What is matter?

• Anything that can be seen or touched

• Only solids and liquids

• Only liquids and gases

• Anything that occupies space and has mass

Which state of matter has a fixed volume but no fixed shape?

• Plasma

• Solid

• Liquid

• Gas

Which phase change is an example of a physical change?

• Photosynthesis

• Rusting of iron

• Burning wood

• Water boiling

What happens during a physical change?

• Atoms rearrange to form new substances

• New elements are formed

• The chemical composition of a substance remains unchanged

• The chemical composition of a substance changes

What happens when hydrogen gas and oxygen gas combine to form water?

• A physical change

• A phase transition

• A change of state

• A chemical change

What is a chemical change?

• A change where the mass of the substance increases

• A change that can be reversed by physical means

• A change where new substances with new chemical bonds are formed

• A change in state of matter

What defines a pure substance?

• A substance that cannot be separated into other materials by any physical process

• A substance that can be separated into other materials by physical processes

• A substance that changes phase at room temperature

• A substance made of two or more types of molecules

What is an element?

• A substance made of only one kind of atom

• A compound made of two or more elements

• A mixture of two or more pure substances

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

What distinguishes a compound from an element?

• Elements are made of multiple types of atoms

• Compounds can be broken down into simpler substances by physical means

• Elements can be separated into other materials by any physical process

• Compounds are made of two or more elements

What is the result of boiling salt water?

• A chemical reaction occurs forming a new substance

• The salt evaporates with the water

• The water evaporates leaving the salt behind

• The salt and water combine chemically