Types of Chemical Reactions, Balancing and Molar Mass Test

Front

What are the four main types of chemical reactions?

Back

Synthesis, Decomposition, Single Replacement, Double Replacement.

Front

Define a coefficient in a chemical equation.

Back

A coefficient is a number placed in front of a chemical formula to indicate how many molecules or moles of that substance are involved in the reaction.

Front

What is the purpose of balancing a chemical equation?

Back

To ensure that the law of conservation of mass is obeyed, meaning the number of atoms of each element is the same on both sides of the equation.

Front

How do you determine the molar mass of a compound?

Back

By adding the atomic masses of all the atoms in the compound's formula.

Front

What is the molar mass of H₂O?

Back

18 g/mol (2 hydrogen atoms at 1 g/mol each and 1 oxygen atom at 16 g/mol).

Front

What does a subscript in a chemical formula indicate?

Back

The number of atoms of the element in one molecule of the compound.

Front

What is the total number of atoms in 2H₂SO₄?

Back

14 atoms (2 H, 2 S, 8 O).

Front

What is a decomposition reaction?

Back

A reaction where a single compound breaks down into two or more simpler products.

Front

Provide an example of a synthesis reaction.

Back

2H₂ + O₂ → 2H₂O.

Front

What is the difference between coefficients and subscripts?

Back

Coefficients indicate the number of molecules, while subscripts indicate the number of atoms in a molecule.