Science Chemistry Test Vocab

Matter

Anything with mass and volume

Chemistry

Study of properties of matter and how they change

Substance

A single kind of matter that is pure and made up of a specific set of properties

Physical properties

A characteristic of a pure substance that can be observed without changing it into another substance

Chemical properties

A characteristic of a pure substance that describes it’s ability to change into different substances

Element

A pure substance that cannot be broken down into any other substances by chemical or physical means

Atom

The basic particle from which all elements are made of

Chemical bond

Force of attraction between 2 atoms

Molecule

Groups of two or more atoms

Compound

A pure substance that is made of two or more elements chemically bonded in a set ratio

Chemical formula

Shows the elements in the compound and the ratio of atoms

Mixture

Made of two or more substances not chemically combined

Heterogenous mixture

Can see the different parts

Homogenous mixture

Mixed so evenly you can’t see the different parts

Solution

A homogenous mixture of two or more substances

Science

The investigation and exploration of natural events and of the new information and taking note of what occurs

Observation

the act of using one or more of your senses to gather information and taking note of what occurs

Inference

A logical explanation of an observation that is drawn from prior knowledge or experience

Hypothesis

An educated guess that can be used to explain an observation which can be proven by tests

Technology

The practical use of scientific knowledge especially for industrial or commercial use

Scientific theory

An explanation of events based off of prior knowledge

Scientific law

A law/rule that describes a consistent pattern in nature

Vaporization

The change from liquid to gas

Evaporation

Vaporization that takes place on the surface of a liquid

Sublimation

Occurs when the surface particles of a solid gain enough energy that they form a gas

Chemical change

A change in matter that produces one or more new substances

Law of conservation of mass

The fact that matter is not created or destroyed in any chemical or physical change

Thermal energy

The total energy of all the particles in an object

Solid

Has a definite shape and a definite volume

Crystalline solid

Solids that are made up of crystals formed by regular, repeating patterns

Amorphous solid

A solid made up of particles that are arranged in an irregular pattern

Liquid

Has a definite volume but no shape of it’s own

Fluid

A substance that flows

Surface tension

The result of an inward pull among the molecules of a liquid bringing the molecules closer together

Viscosity

A liquids resistance to flowing depending on the size and shape of it’s particles and the attraction between particles

Gas

A fluid that can change volume very easily