MII 2nd 9 Weeks Post Assessment

Front

What is the definition of an element?

Back

An element is a pure substance that cannot be broken down into simpler substances by chemical means. It consists of only one type of atom.

Front

What is chlorine?

Back

Chlorine is a chemical element with the symbol Cl and atomic number 17. It is a yellow-green gas at room temperature and is commonly used as a disinfectant.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form or appearance of a substance without changing its chemical composition, while a chemical change results in the formation of new substances.

Front

What is a homogeneous mixture?

Back

A homogeneous mixture is a mixture in which the composition is uniform throughout, meaning that the individual components are not distinguishable.

Front

What is a heterogeneous mixture?

Back

A heterogeneous mixture is a mixture in which the composition is not uniform, and the individual components can be seen and separated.

Front

What is a solvent?

Back

A solvent is a substance that dissolves a solute, resulting in a solution. In lemonade, water is the solvent.

Front

What is the role of temperature in chemical reactions?

Back

Temperature can affect the rate of a chemical reaction; higher temperatures generally increase the reaction rate by providing more energy to the reactants.

Front

What is the significance of measuring temperature in a chemical reaction?

Back

Measuring temperature helps to monitor the heat changes during a reaction, which can indicate whether the reaction is exothermic (releases heat) or endothermic (absorbs heat).

Front

What is an exothermic reaction?

Back

An exothermic reaction is a chemical reaction that releases energy in the form of heat or light.

Front

What is an endothermic reaction?

Back

An endothermic reaction is a chemical reaction that absorbs energy from its surroundings, usually in the form of heat.