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Reaction Exam Review

Standards 4 and 5

QuestionAnswer
elements are represented by symbols
molecules/compounds are represented by chemical formulas
chemical changes/reactions are represented by chemical equations
equations must be ______________ (Law of Conservation of Matter) balanced
number behind/below the symbol or formula subscript
number in front of a symbol or chemical formula coefficient
7 diatomic molecules hydrogen, nitrogen, oxygen, fluorine, chlorine, bromine, iodine
what is (s) ? solid
what is (l) ? liquid
what is (g) ? gas
what is (aq) ? aqueous
what is added to balance an chemical equation: subscript or coefficent coefficient
why can't subscripts be changed ? it would change the compound
substances on the left of an equation reactants
substances on the right of an equation products
2 substances join to form one product EX: __Na + __CL2 ➡ __NaCL synthesis
1 substance breaking away to form 2+ products EX: __NaHCO3 ➡ Na2CO3 + CO2 + H20 decompositon
alone and swaps with another EX: __K + __MgBr2 ➡ __Mg + __KBr single displacement
one element in molecule/compound swaps with another element in molecule/compound EX: __Ba3N2 + __ CaS ➡ __Ca3N + __BaS double displacement
involves burning a hyrdocarbon in oxygen EX: __CH4 + __02 ➡ __ CO2 combustion
element alone will switch with an element if it is ____ active & ____ on the activity series more; higher EX: __Al + __BaCl2 ➡ __Ba + __AlCl3 (not reactive: Ba is above Al)
products of a combustion reaction carbon dioxide & water
products of double displacement between acid & base salt & water
gas identified by burning a wooden splint carbon dioxide
gas identified by "popping" or "barking" hyrdogen
gas identified by a glowing wooden splint to reignite flames oxygen
reaction that gives off heat exothermic
reaction that absorbs heat indothermic
amount of product IS made in a reaction experimental/actual yield
amount of product that COULD be made in a reaction theoretical yield
COMPARISON of amount of product made to what could have been made percentage yield
solid in solution made during an reaction precipitate
5 signs chemical change has occurred produces light, color change, creates gas, temperature change, creates precipitate
study of quantitative relationships between reactants and products in a balanced equation stoichiometry
reactant that runs out first in a chemical reaction limiting reagent
how many atoms: 2Ba(OH)2 Ba- 2 O- 4 H- 4
how many atoms: 2(NH4)2SO4 N- 2 H- 16 S- 2 O- 4
Created by: mckay05
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