Midterm Examination Sample for Chemistry 10 - Semester II 2025-2026

These flashcards cover key terms and concepts from the chemistry midterm examination notes.

Oxidation-Reduction Reaction

A chemical reaction in which the oxidation states of atoms are changed, involving the transfer of electrons.

Thermochemical Equation

An equation that includes the enthalpy change associated with the reaction.

Endothermic Reaction

A reaction that absorbs energy from the surroundings in the form of heat.

Exothermic Reaction

A reaction that releases energy to the surroundings in the form of heat.

Oxidation State

The charge of an atom in a compound, reflecting its ability to gain or lose electrons.

Calcium Chloride (CaCl2) Formation Reaction

The reaction where calcium (Ca) reacts with chlorine (Cl2) to form calcium chloride, involving electron transfer.

Hydrogen Ion (H+)

A positively charged ion representing a proton, often involved in acid-base reactions.

Combustion Reaction

A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of heat and light.

Nitrogen Dioxide (NO2)

A brown gas produced by combustion processes that can act as both an oxidizing and reducing agent.

Hydrazine (N2H4)

A chemical compound often used as a propellant in rocket fuels, known for its high reactivity.

Activation Energy

The minimum energy required for a chemical reaction to occur.

Chemical Kinetics

The study of rates of chemical processes.

Balanced Chemical Equation

An equation that has the same number of each type of atom on both sides, representing the conservation of mass.