Counting Elements and Atoms

Front

What is the chemical formula for a compound containing three hydrogen (H), one sulfur (S), and four oxygen (O) atoms?

Back

H₃SO₄

Front

How many atoms of hydrogen and chlorine are in HCl?

Back

H=1, Cl=1

Front

What does it mean if there is no subscript following an element symbol in a chemical formula?

Back

It means there is only 1 atom of that element.

Front

What is an example of a diatomic element?

Back

O₂ (Oxygen gas)

Front

What are the names of the elements in the compound SN₄O₂?

Back

Sulfur, Nitrogen, and Oxygen.

Front

What is the significance of subscripts in a chemical formula?

Back

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

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 together.

Front

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

Back

Add the subscripts of all elements in the formula; if there is no subscript, count it as 1.

Front

What is the chemical formula for water?

Back

H₂O (2 hydrogen atoms and 1 oxygen atom).

Front

What does the term 'molecular formula' refer to?

Back

It refers to the formula that shows the number and type of atoms in a molecule.