Chemical Reactions

Front

What is a diatomic element?

Back

A diatomic element is a molecule composed of two atoms, which can be of the same or different chemical elements. Examples include H2, O2, and N2.

Front

What subscript is used for diatomic elements?

Back

The subscript for diatomic elements is 2, indicating that there are two atoms in the molecule.

Front

What are the reactants in the combustion of methane?

Back

The reactants are CH4 (methane) and O2 (oxygen).

Front

What are the products of a combustion reaction?

Back

The products of a combustion reaction are typically carbon dioxide (CO2) and water (H2O).

Front

What does it mean for a reaction to be endothermic?

Back

An endothermic reaction absorbs heat from its surroundings, resulting in a decrease in temperature.

Front

What does it mean for a reaction to be exothermic?

Back

An exothermic reaction releases heat to its surroundings, resulting in an increase in temperature.

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 of each element is the same on both sides.

Front

What is the significance of coefficients in a balanced equation?

Back

Coefficients indicate the number of molecules or moles of each substance involved in the reaction.

Front

What bonds are broken in the combustion of methane?

Back

In the combustion of methane, 4 C-H bonds and 2 O=O bonds are broken.

Front

What is the balanced equation for the reaction of tin and chlorine?

Back

The balanced equation is Sn + 2Cl2 → SnCl4.