Crystal Academy of Science and Engineering 6th Grade

Acceleration - The rate of change of velocity; can be calculated by dividing the change in the velocity by the time it takes the change to occur.

Acid -Any substance that produces hydrogen ions in a water solution.

Base - Any substance that forms hydroxide ions in a water solution.

Chemical change- The change that occurs when a substance reacts and forms one or more new substances.

Compound - A substance made up of at least two different elements held together by chemical bonds that can only be broken down into elements by chemical processes.

Condensation - The change of a gas or vapor to a liquid, either by cooling or by being subjected to increased pressure.

Density - Concentration of matter of an object; the mass per unit volume of a substance in a given area.

Dependent variable- The factor being measured or observed in an experiment.

Electromagnetic radiation - The emission and propagation of the entire range of the electromagnetic spectrum including: gamma rays, x-rays, ultraviolet radiation, visible light, microwaves and radio waves.

Electron - A negatively charged subatomic particle that orbits the nucleus of an atom.

Evaporation - The change of a liquid into a vapor at a temperature below the boiling point.

Force - A push or pull exerted on an object.

Gas - A material whose particles are far apart and has no definite shape or volume.

Independent variable - The factor that is changed in an experiment in order to study changes in the dependent variable.

Inertia - The resistance of an object to a change in its motion.

Kinetic energy - Energy a moving object has because of its motion; depends on the mass and speed of the object.

Law of Conservation of Mass - States that the mass of all substances present before a chemical change equals the mass of all the substances remaining after the change.

Liquid - A material whose particles are moving freely and have enough energy to slip out of order.

Magnetic - Having the property of attracting iron and certain other materials by virtue of a surrounding field of force.

Mass - The amount of matter an object contains.

Mixture - The product of two or more substances mixed together but not chemically combines. Mixtures can be separated through physical means such as filtering, freezing, melting, or distilling.

Neutron - A subatomic particle having zero charge, found in the nucleus of an atom.

Nucleus - The center region of an atom where protons and neutrons are located.

pH - A symbol for the measure of the acidity or alkalinity of a solution

Physical change - Any change in size, shape, or state of matter in which the identity of the substance remains the same.

Plasma - Matter consisting of positively and negatively charged particles.

Potential energy - Stored energy an object has due to its position.

Proton - Positively charged subatomic particle in the nucleus of an atom.

Scientific method - A plan of inquiry that uses science process skills as tools to gather, organize, analyze and communicate information.

Solid - A materials whose particles are closely packed together and arranged in geometric patterns

Solubility - A measure of the ability of a substance to dissolve in another substance.

Solution - A mixture of two or more substances uniformly dispersed throughout a single phase.

Speed - Distance an object travels per unit of time.

Velocity - The time-rate at which a body changes its position; defined as displacement divided by the time of travel.

Volume - A measure of the amount of space an object takes up