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Chemistry Vocab

Periodic Table A chart of the chemical elements, arranged by grouping elements with similar properties.
Physical properties Characteristics of a substance that can be tested and/or observed.
Reactants Substances that may undergo a chemical change in an experiment.
Meniscus The curvature in a liquid noticed inside a graduated cylinder. We use the bottom of it to measure accurately.
Chemical change A reaction that creates a new substance. Evidenced by color change, making heat, gas, or a soild
Precipiate A new solid that is formed from a chemical reaction.
Physical Change When s substance changes size, shape, or phase but is STILL the original substances.
Particle A very small piece of matter, such as an atom.
Matter Anything that contains mass and takes up space.
Element A group of substances that cannot be separated into simpler substances by chemical means.
Compound A pure substances composed of 2 or more elements.
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.
Dichotomous Key A tool used to categorize substances by asking questions that have only two choices.
Open system An experimental set-up in which mass or energy can be lost or gained from its surroundings enviroment.
Solid The phase of matter that has a definite shape and volume.
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 substances with a pH less than 7, has a sour taste and keeps or turns 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.
Solubillty Capable of being dissolved or liquefied.
Atom Smallest part of any substance that contains protons, neutrons, and electrons.
Melting point Temperature at which a substance changes from a solid to a liquid. For water it is 0 celsius.
Litmus paper An indicator tool, made of paper, that changes colors in the presence of acid or a base.
Boiling point Temperature at which a substabce changes from a liguid to a gas. For water it is 100 celsius.
Neutral Term used for a substance whose pH is 7, water is an example.
Mixture a combination of materials that can be separated by physical means.
pH a way of expressing how acidic or basic a substance is on a scale or 0-14.
Pure Substances 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 it is 0 Celsius.
Red/pink This color on litmus paper indicates an Acid.
Polymer A long molecule of a chain of smaller, simpler molecules.
Exothermic A chemical reaction which releases heat.
Created by: hvlee18



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