Elements, Compounds & Counting Atoms

Front

What is an element?

Back

A 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 substance formed when two or more elements are chemically bonded together.

Front

Which of the following is not a compound: HCl, NaCHO, K, KCl?

Back

K is not a compound; it is an element.

Front

What does the chemical formula NiF2 represent?

Back

It represents 1 atom of nickel and 2 atoms of fluorine.

Front

What is the difference between an element and a compound?

Back

An element consists of only one type of atom, while a compound consists of two or more different types of atoms chemically bonded.

Front

What are the properties of compounds compared to their constituent elements?

Back

Compounds have different properties than the elements that make them up.

Front

What is the chemical formula for water?

Back

H2O, which consists of 2 hydrogen atoms and 1 oxygen atom.

Front

What is a mixture?

Back

A combination of two or more substances that are not chemically bonded and can be separated by physical means.

Front

What does it mean for atoms to be chemically bonded?

Back

It means that atoms are held together by chemical forces to form a compound.

Front

What is the significance of subscripts in a chemical formula?

Back

Subscripts indicate the number of atoms of each element in a compound.