Counting Atoms

Front

What is an atom?

Back

An atom is the smallest unit of matter that retains the properties of an element. It consists of a nucleus made of protons and neutrons, surrounded by electrons.

Front

What is a molecule?

Back

A molecule is a group of two or more atoms bonded together. Molecules can consist of the same or different types of atoms.

Front

What is a compound?

Back

A compound is a substance formed when two or more different types of atoms bond together in a fixed ratio.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. Each element is made up of only one type of atom.

Front

How many atoms are in a molecule of water (H2O)?

Back

A molecule of water contains 3 atoms: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the difference between a mixture and a compound?

Back

A mixture is a combination of two or more substances that retain their individual properties, while a compound is a substance formed from the chemical combination of two or more different elements.

Front

What does the subscript in a chemical formula indicate?

Back

The subscript in a chemical formula indicates the number of atoms of the element present in the molecule. For example, in H2O, the '2' indicates there are 2 hydrogen atoms.

Front

What is the chemical formula for glucose?

Back

The chemical formula for glucose is C6H12O6.

Front

Which element is a noble gas and does not readily form compounds?

Back

Argon is a noble gas and is least likely to form compounds due to its full valence shell.

Front

How many different elements are in the chemical formula H2SO4?

Back

There are 3 different elements in the chemical formula H2SO4: Hydrogen (H), Sulfur (S), and Oxygen (O).