Chem and Water Quiz

Basic Atomic Structure

The arrangement of protons, neutrons, and electrons in an atom, with a positively charged nucleus surrounded by negatively charged electrons.

Common Elements

Elements frequently found on the periodic table, including Hydrogen (H), Helium (He), Carbon (C), Oxygen (O), Nitrogen (N), Sodium (Na), Aluminum (Al), and Potassium (K).

Ion

An atom or group of atoms that carries a positive or negative electric charge due to the loss or gain of one or more electrons.

Compound

A substance formed from two or more different elements that have been chemically joined, such as water (H2O) and table salt (NaCl).

Valence Electrons

Electrons in the outermost shell of an atom that can participate in chemical bonding; examples include hydrogen (H) and sodium (Na).

Isotopes

Variants of a chemical element with the same number of protons but different numbers of neutrons, differing in mass and physical properties.

pH Scale

A scale measuring the acidity or basicity of a solution, ranging from 0 (most acidic) to 14 (most basic), with 7 being neutral.

Buffer

A solution that resists pH changes upon the addition of acids or bases, maintaining a relatively stable pH.

Cohesion

The tendency of molecules of the same type to stick together through hydrogen bonds.

Adhesion

The binding of different types of molecules together through hydrogen bonds.

Polarity of Water

Water molecules have an uneven distribution of electron density, leading to polarity and the ability to form hydrogen bonds.

Surface Tension

The property of a liquid's surface that allows it to resist external forces due to cohesive forces among its molecules.

Capillary Action

The movement of liquid through or along another material against gravity, facilitated by adhesion and cohesion.

High Heat Capacity

The property of water that requires a significant amount of energy to change its temperature, making it stable in temperature changes.

Density of Water

The unique property of water that allows it to be less dense as a solid (ice) than as a liquid, enabling it to float.

atomic mass

Atomic MassAtomic mass is the weighted average mass of an element's isotopes, measured in atomic mass units (amu). It reflects the number of protons and neutrons in the nucleus of an atom. For example, the atomic mass of carbon is approximately 12.01 amu.

atomic number

Atomic Number

• Definition: The atomic number is the number of protons in the nucleus of an atom.

• Symbol: Represented by the letter "Z".

• Significance: Determines the element's identity and its position in the periodic table.