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

Front

What is a pure solid monatomic element?

Back

A pure solid monatomic element consists of only one type of atom and is in solid form, such as helium (He) in its solid state.

Front

What does the law of conservation of energy state?

Back

The law of conservation of energy states that energy cannot be created or destroyed, only transferred or transformed.

Front

Why does an ice cube feel cold when held?

Back

An ice cube feels cold because heat moves from our hands into the ice cube, causing the ice to absorb energy.

Front

What is a pure gas compound?

Back

A pure gas compound is a substance made up of two or more different elements that are chemically bonded and exist in the gaseous state, such as carbon dioxide (CO2).

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, resulting in a decrease in temperature.

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy to its surroundings, often in the form of heat.

Front

What does ΔH represent in a chemical reaction?

Back

ΔH represents the change in enthalpy, indicating the amount of energy absorbed or released during a reaction.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a combination of two or more substances that remain distinct and can be physically separated, such as oil and water.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the components are uniformly distributed and cannot be easily distinguished, such as saltwater.

Front

What is the difference between a compound and a mixture?

Back

A compound is a substance formed when two or more elements are chemically bonded, while a mixture is a physical combination of two or more substances.