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Chemical Reactions

Vocabulary Set

TermDefinition
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)
Created by: ttomm