A_19: Elements, Compounds, and counting Atoms

Front

What is the total number of atoms in the chemical formula H₂O₂?

Back

4

Front

What is the chemical formula that represents 1 atom of nickel and 2 atoms of fluorine?

Back

NiF₂

Front

How many oxygen atoms are present in the molecule H₂O?

Back

1

Front

How many oxygen atoms are there in the molecule O₂?

Back

2

Front

What type of substance is copper wire?

Back

Pure substance

Front

Define an element in chemistry.

Back

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

Front

What is a compound in chemistry?

Back

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

Front

How do you determine the number of atoms in a chemical formula?

Back

By adding the subscripts of each element in the formula.

Front

What is the significance of subscripts in a chemical formula?

Back

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

Front

What is the difference between an element and a compound?

Back

An element is a pure substance made of one type of atom, while a compound is made of two or more different types of atoms chemically bonded.