Understanding Elements and Compounds

What is matter primarily composed of?

• Molecules

• Atoms

• Elements

• Compounds

Which of the following is a characteristic of pure substances?

• They can be broken down by physical means.

• They consist of only one kind of particle.

• They have a variable composition.

• They are always heterogeneous.

What is an element?

• A substance that consists of only one type of atom.

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

• A mixture of different types of atoms.

• A compound of two or more elements.

Which of the following is an element?

• Table sugar

• Carbon

• Sodium hydroxide

• Hydrochloric acid

What type of substance is hydrochloric acid?

• Solution

• Compound

• Mixture

• Element

Magnesium is classified as which type of substance?

• Compound

• Element

• Mixture

• Solution

Table sugar, scientifically known as sucrose, is a:

• Element

• Compound

• Mixture

• Solution

What is the chemical formula for sodium hydroxide?

• NaCl

• H2O

• CO2

• NaOH

Which of the following is a compound?

• Copper

• Carbon

• Carbon monoxide

• Mercury

What is a similarity between elements and compounds?

• Both are heterogeneous.

• Both have a definite composition.

• Both can be broken down by physical means.

• Both consist of multiple types of atoms.