Counting Atoms

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. The total mass of reactants equals the total mass of products.

Front

What is a chemical equation?

Back

A chemical equation is a symbolic representation of a chemical reaction, showing the reactants and products along with their quantities.

Front

How do you determine the number of atoms in a molecule?

Back

To determine the number of atoms in a molecule, add the subscripts of each element in the chemical formula. For example, in C6H12O6, there are 6 carbon, 12 hydrogen, and 6 oxygen atoms.

Front

What is a reactant in a chemical reaction?

Back

A reactant is a substance that undergoes change during a chemical reaction, appearing on the left side of a chemical equation.

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, appearing on the right side of a chemical equation.

Front

How many different elements are in the compound H2SO4?

Back

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

Front

What is the significance of subscripts in a chemical formula?

Back

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

Front

How many total atoms are in the molecule C6H12O6?

Back

There are 24 total atoms in C6H12O6 (6 carbon + 12 hydrogen + 6 oxygen = 24).

Front

What is the formula for calculating the total number of atoms in a compound?

Back

The total number of atoms in a compound can be calculated by summing the products of the number of atoms of each element and their respective subscripts.

Front

What is the role of oxygen in chemical reactions?

Back

Oxygen is often a reactant in combustion and respiration reactions, and it is essential for the formation of many compounds.