30 terms

Science olympiad "it matters"

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Atom
Smallest unit of matter that retains the properties of an element
Compounds
A substance that forms when two or more elements combine chemically
Electron Cloud
A cloud of Electrons that surrounds the Nucleus.
Element
A substance that cannot be broken down into simpler substances
Electrons
A negatively charged particle outside the nucleus of an atom.
Evaporation
To cgange from a liquid or solid to a gas.
Filtration
A process that separates a solid from the liquid in a heterogeneous mixture
Heterogeneous
A mixture that is un-evenly mixed.
Homogeneous
A mixture that is evenly mixed. also called a solution.
Matter
Anything that has mass and takes up space
Mixtures
A combination of two or more substances that are not chemically combined.
Molecuels
smallest unit of a substance that retains that compound's properties
Neutrons
Electrically neutral partical that has the same mass as a proton and is found in an atom's nucleus.
Nucleus
positively charged mass within an atom that contains protons and neutrons.
Protons
A positively charged particle in the nucleus of an atom
Pure substance
Any single type of material that is free from containment and has not been mixed with any other substance.
Solute
A substance that is dissolved in a solution.
Solution
A homogeneous mixture of two or more substances
Solevent
A substance in which solutes dissolve
Valence Electrons
Electrons in the outermost shell which can combine with other atoms to form molecules.
Buoyancy
Ability to float
Solid
Definite shape and volume
Liquid
A state of matter that has a definite volume but no definite shape.
Gas
A state of matter with no definite shape or volume
Metric system
A system of weights and measures that is based on multiples of 10
Volume
Amount of space occupied by a fluid
Chemical change
A change in matter that produces one or more new substances
Heat
Energy that is being transferred.
Insulator
A material that does not allow heat or electrons to move through it easily.
Physical change
A change in a substance that does not involve a change in the identity of the substance
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