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Chemistry Vocab List

TermDefinition
Periodic Table A chart of the chemical elements, arranged by grouping elements with similar properties.
Reactants Substances that may undergo a chemical change in an experiment.
Chemical Change A reaction that creates a new substance. Evidence by color change, making heat,gas,or a solid
Physical Change When a substance changes size, shape or phase but is STILL the original substance.
Matter Anything that contains mass or takes up space.
Compound A pure substance composed of 2 or more elements.
Dichotomus Key A tool used to categorize substances by asking questions that only have 2 choices.
Solid The phase of matter that has a definite shape and volume.
Physical Properties Characteristics of a substance that can be tested and/or observed.
Meniscus The curvature in a liquid noticed inside a graduated cylinder. We use the bottom of it to measure accurately.
Participate A new solid that is formed in a chemical reaction.
Particle A very small piece of matter, such as an atom.
Element One of a group of substances that cannot be separated into simpler substances by chemical means.
Conservation Of Mass Rule that states that in a closed system, even after physical and chemical changes occur, the total amount of the substances you started with equals the total amount of the substances you end with.
Open System An experimental set-up in which mass or energy can be lost or gained from its surrounding environment.
Closed System When reactions take place without the influence of outside factors. Nothing is lost or gained.
Liquid The phase of matter where the atoms take the shape of its container.
Acid A substance with a pH less than 7, has a sour taste and keeps or turn litmus paper pink.
Gas The phase of matter where the atoms fill the shape and volume of its container.
Base A substance with a pH greater than 7, feels slippery, tastes bitter, and keeps or turns litmus paper blue.
Solubility Capable of being dissolved or liquified.
Atom Smallest part of any substance that contains protons, electrons, and neutrons.
Melting Point Temperature at which a substance changes solid to liquid. For water its 0 Celsius.
Litmus Paper AN indicator tool, made of paper, that changes color in the presence of an acid or a base.
Boiling Point Temperature at which a substance changes from a liquid to a gas. For water its 100 Celsius.
Neutral Term used for a substances whose pH is 7, water is an example.
Mixture A combination of substances that can be separated by physical means.
pH (scale) A way of expressing how acidic or basic a substances is on a scale from 1-14.
Pure Substance Any single type of matter that cannot be separated by physical means.
Blue This color on litmus paper indicates a base.
Freezing Point Temperature at which a substance changes from a liquid to a solid. For water its 0 Celsius.
Red/Pink This color on litmus paper indicates an acid.
Polymer A long molecule made of a paper chain of smaller, more simpler molecules.
Exothermic A chemical reaction which releases heat.
Created by: apeele18