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Chemical Reactions

grade 7 terms

TermDefinition
activation energy amount of energy needed to start a chemical reaction
arrow the arrow means "is changed into" we say YIELDS
characteristics of a chemical reaction changes in energy or changes in properties
chemical changes alter the chemical properties of matter; new substances with new properties are formed
chemical equations a shorter, easier way to show chemical reactions by using symbols instead of words
coefficient a number placed in front of a chemical formula in an equation. Tells how many atoms or molecules of each reactant and product take part in the reaction
conservation of mass the amount of matter involved in a chemical reaction does not change. the total mass of the reactants must equal the total mass of the products
decomposition reaction a compound breaks down into simpler substances
exothermic a reaction that releases heat; gives off energy, makes it feel warmer; most chemical reactions are this type; energy is on the product side of the chemical equation
endothermic a reaction that takes in heat, absorbs energy, energy is a reactant side of the chemical equation
physical changes Alter only the physical properties of matter; no new substances are forms
precipitate a solid that forms from solution during a chemical reaction; observable change that shows a chemical reaction took place.
products the materials you have after a chemical reaction; written on the right side
reactants the materials you have at the beginning of a chemical reaction; written on the left side
replacement reaction one part of a compound is displaced by an element or compound from another substance.
states of matter solid, liquid,gas. Changes in state of matter are physical changes
subscripts show the number of atoms of an element in a molecule or the ratio of elements in a compound
synthesis reaction two or more substances combine to form a new compound.
concentration amount of material in a given amount of another material
catalyst materials that increase the rate of reaction, never part of the reaction
enzymes catalysts found in your body
temperature/reaction rate increase temperature increases rate of reaction
surface area/reaction rate increase surface area increases rate of reaction
concentration/reaction rate increase concentration increases rate of reaction
temperature a measure of the amount of kinetic energy in an object. the faster the movement, the hotter the temperature
surface area Surface area is the measure of how much exposed area a solid object has
concentration amount of a substance in a space
Created by: bkorenstein