2024 - 2025 (R) Review for Flashcard #5, Semester 1

Front

What is enthalpy in the context of a chemical reaction?

Back

Enthalpy is the change in the heat content of a chemical system during a reaction.

Front

What does an exothermic reaction do to energy?

Back

An exothermic reaction releases energy, usually in the form of heat.

Front

What does an endothermic reaction do to energy?

Back

An endothermic reaction absorbs energy from its surroundings.

Front

In an experiment, what is the dependent variable?

Back

The dependent variable is the factor that is measured or observed in an experiment, often responding to changes in the independent variable.

Front

In an experiment, what is the independent variable?

Back

The independent variable is the factor that is changed or controlled in an experiment to test its effects on the dependent variable.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a combination of substances that remains distinct and can be physically separated.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture that has a uniform composition throughout and cannot be easily separated.

Front

What is a mixture?

Back

A mixture is a combination of two or more substances that can be separated by physical processes.

Front

What is a compound?

Back

A compound is a substance formed when two or more elements are chemically bonded together.

Front

What is an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means.