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Chemical Reactions
Vocabulary Set
Term | Definition |
---|---|
Atom | Smallest particle of an element; made up of protons, neutrons, and electrons |
Boiling | Type of vaporization that occurs throughout a liquid; such as water turning into steam |
Chemical Change | Type of reaction in which matter is changed and a new substance is created |
Chemical Equation | Represents a chemical reaction using chemical formulas and coefficients, such as Na + Cl --> NaCl |
Chemical Formula | Represents a chemical compound (with symbols and subscripts), such as NaCl or MgO |
Chemical property | Describes how matter could react or change, such as flammability |
Chemical Symbols | Letter or letters that are used to represent the elements, such as H or O |
Coefficient | A number in front of a chemical formula in an equation that indicates how many molecules or atoms of each reactant and product are involved in a reaction. |
Compound | Pure substance made of two or more elements that are chemical combined |
Condensation | Gas turning into a liquid from a loss of thermal energy; such as water vapor turning into water droplets in a cloud |
Conservation of Mass | Law that states the total mass of the reactants must equal the total mass of the products |
Density | Calculated by dividing an object's mass by its volume |
Deposition | Occurs when a gas (vapor) turns to a solid (frost) without going through the liquid phase |
Element | Simplest pure substance, represented by a chemical symbol |
Endothermic | Reaction or change that absorbs energy during the process |
Evaporation | Type of vaporization that occurs at the surface of a liquid; such as water turning into water vapor at the surface of a puddle |
Exothermic | Reaction or change that gives off energy during the process |
Freezing | Liquid turning into a solid from a loss of thermal energy |
Gas | Phase of matter that does not have a definite shape or volume as it takes up any available space; particles far apart |
Liquid | Phase of matter with a definite volume, but no definite shape as it takes the shape of its container; particles further apart and moving past one another |
Mass | Amount of matter in an object; does not change with changes in gravity |
Matter | Anything that has mass and volume |
Melting | Solid turning into a liquid from a gain of thermal energy |
Mixture | Two or more substance mixed together but NOT chemically combined |
Periodic Table | Shows the periodic properties of elements with the elements organized into families or groups (columns) and periods (rows) |
Phase (State) | Form for matter with varying levels of thermal energy; solids, liquids, and gases |
Physical change | Change in size, shape, or state; does not create a new substance |
Physical property | Describes the appearance and other characteristics of matter, such as its color, shape, or size |
Pressure | The amount of force exerted per unit area of a surface; may cause matter to change state |
Products | Substances that are produced by a chemical reaction |
Reactants | Substances that enter into a chemical reactions |
Reaction Rate | The speed at which a chemical reaction takes place |
Solid | Phase of matter with a definite shape and volume; particles closely packed and vibrate in position |
Sublimation | Occurs when a solid (dry ice) turns to a gas (CO2 gas) without going through the liquid phase |
Subscript | Number that shows the number of atoms of each element in a compound |
Vaporization | Occurs when a liquid changes into a gas; may be evaporation or boiling |
Volume | Amount of space an object takes up |
Weight | Measure of the force of gravity acting on an object; changes with changes in gravity (such as weighing less on the moon) |