Counting Atoms

Front

What is a subscript in a chemical formula?

Back

A subscript is a small number written below and to the right of an element symbol that indicates the number of atoms of that element in a molecule.

Front

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

Back

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

Front

What does the formula MgCl2 represent?

Back

The formula MgCl2 represents magnesium chloride, which consists of one magnesium atom and two chlorine atoms.

Front

How many different elements are in the compound C6H12O6?

Back

There are 3 different elements in C6H12O6: carbon (C), hydrogen (H), and oxygen (O).

Front

What is the total number of atoms in H2SO4?

Back

There are 7 total atoms in H2SO4: 2 hydrogen, 1 sulfur, and 4 oxygen.

Front

What is the product of the reaction 2H2 + O2?

Back

The product of the reaction 2H2 + O2 is 2H2O (water).

Front

How many magnesium atoms are in 10MgCl2?

Back

There are 10 magnesium atoms in 10MgCl2.

Front

What does the coefficient in a chemical equation indicate?

Back

The coefficient indicates the number of molecules or moles of a substance involved in the reaction.

Front

What is the significance of balancing a chemical equation?

Back

Balancing a chemical equation ensures that the number of atoms for each element is the same on both sides of the equation, following the law of conservation of mass.

Front

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

Back

To calculate the total number of atoms in a compound, sum the number of atoms of each element, multiplied by their respective subscripts.