Chemical reactions - Number of atoms, products, reactants

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction, starting materials that react to form products.

Front

What is a product in a chemical reaction?

Back

A product is a substance that is formed as a result of a chemical reaction, the end result of the reactants reacting.

Front

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

Back

There are 3 atoms in a molecule of water: 2 hydrogen atoms and 1 oxygen atom.

Front

What is the total number of atoms in the molecule H2O2?

Back

There are 4 atoms in H2O2: 2 hydrogen atoms and 2 oxygen atoms.

Front

How many nitrogen atoms are in the molecule NH3?

Back

There is 1 nitrogen atom in the molecule NH3.

Front

What does the subscript in a chemical formula indicate?

Back

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

Front

In the formula Fe(C5H5)3, how many hydrogen atoms are present?

Back

There are 15 hydrogen atoms in the formula Fe(C5H5)3.

Front

What is the significance of coefficients in a chemical equation?

Back

Coefficients indicate the number of molecules or moles of a substance involved in the reaction.

Front

How many carbon atoms are in the formula 2Fe(C5H5)2?

Back

There are 20 carbon atoms in the formula 2Fe(C5H5)2.

Front

What is the molecular formula for glucose?

Back

The molecular formula for glucose is C6H12O6.