38 terms

Chemical Interactions Unit 3 Vocab

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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 Symbols
Letter or letters that are used to represent the elements, such as H or O
Compound
Pure substance made of two or more elements that are chemical combined
Conservation of Mass
Law that states the total mass of the reactants must equal the total mass of the products
Matter
Anything that has mass and volume
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
Subscript
Number that shows the number of atoms of each element in a compound
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.
Chemical property
Describes how matter could react or change, such as flammability
Chemical Change
Type of reaction in which matter is changed and a new substance is created
Density
Calculated by dividing an object's mass by its volume
Element
Simplest pure substance, represented by a chemical symbol
Mass
Amount of matter in an object; does not change with changes in gravity
Mixture
Two or more substance mixed together but NOT chemically combined
Physical property
Describes the appearance and other characteristics of matter, such as its color, shape, or size
Physical change
Change in size, shape, or state; does not create a new substance
Volume
Amount of space an object takes up
Phase (State)
Form for matter with varying levels of thermal energy; solids, liquids, and gases
Vaporization
Occurs when a liquid changes into a gas; may be evaporation or boiling
Sublimation
Occurs when a solid (dry ice) turns to a gas (CO2 gas) without going through the liquid phase
Endothermic
Reaction or change that absorbs energy during the process
Exothermic
Reaction or change that gives off energy during the process
Melting
Solid turning into a liquid from a gain of thermal energy
Freezing
Liquid turning into a solid from a loss of thermal energy
Boiling
Type of vaporization that occurs throughout a liquid; such as water turning into steam
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
Condensation
Gas turning into a liquid from a loss of thermal energy; such as water vapor turning into water droplets in a cloud
Solid
Phase of matter with a definite shape and volume; particles closely packed and vibrate in position
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
Gas
Phase of matter that does not have a definite shape or volume as it takes up any available space; particles far apart
Weight
Measure of the force of gravity acting on an object; changes with changes in gravity (such as weighing less on the moon)
Periodic Table
Shows the periodic properties of elements with the elements organized into families or groups (columns) and periods (rows)
Deposition
Occurs when a gas (vapor) turns to a solid (frost) without going through the liquid phase
Atom
Smallest particle of an element; made up of protons, neutrons, and electrons
Pressure
The amount of force exerted per unit area of a surface; may cause matter to change state