Chemistry

Precision

A measure of how closely individuals agree with one another

Accuracy

How closely individuals measurements agree with the correct or true value

Hydrate

A compound that contains water molecules weakly bound in the crystals

Law of constant composition

It states that the elemental composition of a pure substance never varies

John Dalton atomic theory

All matter is composed of indivisible atoms

All atoms of an element are identical in mass, size and other properties

What is the atomic number?

The atomic number is the number of protons in an atom's nucleus, defining the element.

What is a mole in chemistry?

A mole is a unit that measures the amount of a substance, equivalent to 6.022 x 10²³ particles.

What is the pH scale used for?

The pH scale measures the acidity or basicity of a solution, ranging from 0 (acidic) to 14 (basic).

What are covalent bonds?

Covalent bonds are chemical bonds formed when two atoms share electrons.

What is the difference between endothermic and exothermic reactions?

Endothermic reactions absorb heat, while exothermic reactions release heat.

What is a catalyst?

A catalyst is a substance that increases the rate of a chemical reaction without being consumed.

What is an ionic bond?

An ionic bond is formed when one atom transfers electrons to another, creating oppositely charged ions that attract.

What is the law of conservation of mass?

The law states that mass is neither created nor destroyed in a chemical reaction.

What is Avogadro's number?

Avogadro's number is 6.022 x 10²³, the number of atoms, molecules, or particles in one mole of a substance.

What is oxidation in chemistry?

Oxidation is the process in which an atom or molecule loses electrons.