Review on Elements and Compounds

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances and is made up of only one kind of atom.

Front

What is a compound?

Back

A compound is a substance formed when two or more different elements are chemically bonded together.

Front

Which of the following is not a compound: HCl, NaCl, Cl, CO2?

Back

Cl is not a compound; it is an element.

Front

What is the chemical formula for sulfuric acid?

Back

H2SO4 is the chemical formula for sulfuric acid.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript indicates the number of atoms of the element in the compound.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that are not chemically bonded, while a compound is a substance formed from a chemical reaction between elements.

Front

What cannot be broken down into other substances: Compound, Solids, Mixture, Element?

Back

An Element cannot be broken down into other substances.

Front

What are the components of H2SO4?

Back

H2SO4 is made up of 2 hydrogen atoms, 1 sulfur atom, and 4 oxygen atoms.

Front

What is a chemical formula?

Back

A chemical formula is a way of expressing the composition of a compound using symbols for the elements and numbers to indicate the ratio of atoms.

Front

Give an example of a compound.

Back

Water (H2O) is an example of a compound, made from hydrogen and oxygen.