Balance equations

Front

What is a balanced equation?

Back

A balanced equation has the same number of each type of atom on both sides of the equation, indicating that mass is conserved during a chemical reaction.

Front

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

Back

Count the subscripts in the chemical formula. For example, in H2O, there are 2 hydrogen atoms and 1 oxygen atom.

Front

What does the subscript in a chemical formula represent?

Back

The subscript indicates the number of atoms of the element in the molecule. For example, in CO2, the '2' indicates there are 2 oxygen atoms.

Front

What is the law of conservation of mass?

Back

The law states that mass cannot be created or destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Front

How many Aluminum (Al) atoms are in Al2O3?

Back

There are 2 Aluminum (Al) atoms in Al2O3.

Front

How many elements are in C6H12O6?

Back

There are 3 different elements in C6H12O6: Carbon (C), Hydrogen (H), and Oxygen (O).

Front

How many atoms of carbon (C) are in C6H12O6?

Back

There are 6 Carbon (C) atoms in C6H12O6.

Front

How many Sodium (Na) atoms are in 6NaCl?

Back

There are 6 Sodium (Na) atoms in 6NaCl.

Front

What does it mean if an equation is not balanced?

Back

It means that the number of atoms of at least one element is different on the reactant side compared to the product side.

Front

Is the equation Al + O2 -> 2Al2O3 balanced?

Back

No, the equation is not balanced.