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Chemistry Vocab List

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
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Term
Definition
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.  


   






 
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