Term | Definition |
Chemistry | is the study of the properties of the matter and how changes |
Element | is a substance that cannot be broken down into any other substances by chemical or physical means |
Compound | is a substance made of two or more elements chemically combined in a specific ratio, or proportion. |
Mixture | is made from two or more pure substances - elements, compounds, or both - that are in the same place but not combined as a new material. |
Solution | is a well-mixed mixture. |
Physical Change | A change that alters the form or appearance of a material but does not make the material into another substance |
Chemical Change | A change in matter that produces new substances |
Precitate | A solid that forms from solution during a chemical reaction |
Atom | The smallest particle of an element |
Molecule | is the combination of 2 or more atoms |
Chemical bond | The force that holds atoms together |
Chemical equation | is a shorter, easier way to show chemical reactions, using symbols instead of words. |
Symbol | most elements are represented by a one-letter or 2 letter |
Chemical formula | shows the ratio of elements in the compound |
Subscript | shows the number of atoms of an element in a molecule |
Reactants | The materials you have at the beginning of a chemical reaction |
Products | when the reactant is complete |
Conversation of matter | the principle stating that matter is not created or destroyed during a chemical reaction |
Coefficient | is a number in front of a chemical formula in the equation |
Synthesis | When two or more substances combine to make a more complex substance |
Decomposition | A reaction that breaks down compounds into simpler products |
Replacement Reaction | A reaction in which one element replaces another in a compound or in which two elements in different compounds trade places |
Exothermic Reaction | A reaction that releases energy in the form of heat |
Endothermic reaction | A reaction that absorbs energy |
Activation Energy | is the minimum amount of energy that has to be added tp start a reaction |
Consecration | is the amount of one material in a given volume of another material |
Catalyst | is a material that increases the rate of a reaction by lowering the activation energy |
Enzymes | Provide a surface on which reactions take place |
Inhibitor | A material used to decrease the rate of a reaction |
Combustion | Is a rapid reaction between oxygen and a substance called a fuel |
Fuel | Is a material that releases energy when it burns |