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Chemical Reactions

Definitionsn and Important Questions

physical change definition + characteristic process in which no new substance is created+ usually not easy to reverse
examples of physical change jelly setting in freezer, grating cheese, haircut, chopping inion, mixtures
exothermic process definition a process in which heat is given out to surrounding
why do you produce sweat (in exothermic context) if water evaporates on your body, it takes heat from body to change from liquid to gas. sweat uis produced for this reason- to cool you down.
exothermic process example water turning into ice: because the water loses heat to be able to turn into a solid
exothermic or endothermic: icicles melting Endothermic: is takes in heat from surroundings in order to melt
exothermic or endothermic: burning candle exo
exothermic or endothermic: animal respiring exothermic: when respiration energy is released into body!!
exothermic or endothermic: plants photosynthesising Photosynthesis is an endothermic reaction because in order for it to occur, the plants in which it occurs must absorb energy
exothermic or endothermic: rusting iron exothermic : heat is released
chemical reactions definition a process that involves rearrangement of the molecular or ionic structure of a substance, as distinct from a change in physical form or a nuclear reaction.
three chemical indications -gas produced -colour change / cloudiness occurs -heat, sound, electricity produced
chemical reaction characteristics x3 -new substance formed (iron+air=iron oxide) -usually cannot be reversed (cake baking) -involves an energy change (firework)
why do glowsticks glow? when you first bend a glowstick, it releases a chemical from an inner capsule. this reacts with the other chemicals and causes the fluorescent dye to glow
chemical reaction examples egg making, cake baking, rusting, food digestion, when muscle cells release energy from digested food, firework
rusting experiment: conditions necessary for rusting -water and oxygen must be present for rusting to occur
rusting experiment: what should you do to the water before? boil it and cool. boiling it removes any oxygen dissolved in it
rusting experiment: why put oil ontop of water stops oxygen getting into water
rusting experiment: what chemical should be used for the contol? calcium chloride: removes moisture from air
reactants def reactants are the substances present before the chemical change takes place
products def the products of a substance that are formed by the end of the chemical reaction
vinegar+ baking soda = ? co2 + sodium acetate + water
photosynthesis equation carbon dioxide + water= glucose + oxygen
respiration equation glucose + oxygen= carbon dioxide + water
equation for when you light gas on a gas cooker methane+ oxygen = carbon dioxide + water vapour
Law of Conservation of Mass states that matter cannot be created or destroyed, but can only be changed from one form to another
what can we conclude from the law of conservation of mass? total mass of reactants= equal to the mass of the products
Activation energy is the minimum amount of energy needed to start a chemical energy
expale of activation energy hydrogen and oxygen mixed at room temperature will not create any new substance unless it is under a slame
reaction rates the speed of a reaction
what cause chemical reactions? molecules and atoms colliding
how is the particles present in the reactants affecting the reaction rate the more molecules of the reactants there are the more often the molecules will collide. the more energy the molecules have, the harder the collisions will be
Created by: grishmakandel12



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