Unit 5 Chemistry review

Front

What is a synthesis reaction?

Back

A synthesis reaction is a type of chemical reaction where two or more simple substances combine to form a more complex product. Example: Mg + Br2 → MgBr2.

Front

What is a decomposition reaction?

Back

A decomposition reaction is a type of chemical reaction where a single compound breaks down into two or more simpler products. Example: Ag2O → Ag + O2.

Front

How do you balance a chemical equation?

Back

To balance a chemical equation, adjust the coefficients of the reactants and products to ensure that the number of atoms for each element is the same on both sides of the equation.

Front

What is the balanced equation for the combustion of methane (CH4)?

Back

The balanced equation is: CH4 + 2O2 → CO2 + 2H2O.

Front

What is the balanced equation for the reaction of aluminum with hydrochloric acid?

Back

The balanced equation is: 2Al + 6HCl → 3H2 + 2AlCl3.

Front

What is a single replacement reaction?

Back

A single replacement reaction is a type of chemical reaction where one element replaces another in a compound. Example: Zn + CuSO4 → ZnSO4 + Cu.

Front

What is a combustion reaction?

Back

A combustion reaction is a type of chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light and heat. Example: C3H8 + 5O2 → 3CO2 + 4H2O.

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 the difference between coefficients and subscripts in a chemical formula?

Back

Coefficients indicate the number of molecules or moles of a substance, while subscripts indicate the number of atoms of an element in a molecule.

Front

What is the balanced equation for the reaction of carbon tetrafluoride with bromine?

Back

The balanced equation is: CF4 + 2Br2 → CBr4 + 2F2.