Unit 1 Re-test 2025

Front

What word describes when water is attracted to other substances?

Back

Adhesion: The tendency of water molecules to be attracted to other substances, allowing it to spread and wet surfaces.

Front

What is the range of the pH scale?

Back

0-14: The pH scale measures the acidity or alkalinity of a solution, with 0 being very acidic, 7 neutral, and 14 very alkaline.

Front

What is Carbon classified as?

Back

Element: Carbon is a fundamental building block of life and is classified as a chemical element.

Front

Is H₂O an element or a compound?

Back

Compound: H₂O, or water, is a compound made up of two hydrogen atoms and one oxygen atom.

Front

Which of the following is not a compound: HCl, Cl, NaCl, CO₂?

Back

Cl: Chlorine (Cl) is an element, while HCl, NaCl, and CO₂ are compounds.

Front

What is cohesion in relation to water?

Back

Cohesion: The attraction between water molecules, which causes them to stick together, leading to phenomena like surface tension.

Front

Define a chemical element.

Back

Chemical Element: A pure substance that cannot be broken down into simpler substances by chemical means, consisting of atoms with the same number of protons.

Front

What is a compound?

Back

Compound: A substance formed when two or more elements chemically bond together in fixed proportions.

Front

What is the significance of the pH scale in chemistry?

Back

The pH scale indicates the acidity or basicity of a solution, which is crucial for chemical reactions and biological processes.

Front

What is an example of a homogeneous mixture?

Back

Homogeneous Mixture: A mixture that has a uniform composition throughout, such as saltwater.