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CHEM LAB 5

physical and chemical processes

QuestionAnswer
In matter, processes that do not alter the basic nature(chemical composition) of the substance involved. Physical changes
Formation of a new substance that has physical and chemical properties different from the original substance Chemical changes
one element loses electrons and another element gains electrons oxidation-reduction reaction
process of gaining electrons reduction
losing electrons oxidation
LEO lose electrons oxidation
GER Gain electrons reduction
OIL RIG oxidation is loss of electrons, reduction is gain of electrons
no changes occur spectator ion
X + Y= XY Ex: S + O2 = SO2 Ex: SO3 + H2O SO4 synthesis reaction
Formation of a single product from two or more elements synthesis reaction
Conversion of a complex substance into two simpler substances Decomposition reaction
XY= X + Y Ex: 2H2O = 2H2 + O2 Decomposition reaction
an element replaces another element in its compound. Single-replacement reaction
X + YZ = Y + XZ Ex: Zn + H2SO4 = H2 + ZnSO4 Ex: Fe + CuSO4 = Cu + FeSO4 single-replacement reaction
two compounds exchange parts(ions) to form two new compounds: Double-replacement reaction
AX + B = BX + AY Ex: AgNO3 + HCI = HNO3 + AgCI Double-replacement reaction
CaCO3 + HCI = CaCI2 + H2O + CO2
Ba(NO3)2(aq) + Na2SO4(aq) = BaSO4(ppt) +2NaNO3(aq)
aq means aqueous , dissolves in water
ppt or arrow down means precipitate, not soluble in water
Ca(NO3)2 + Na3(PO4)= Ca3(PO4)2 + NaNO3
change of a solid directly to the gas state without melting is sublimation
Iodine used in tan lotions, purify water, table salt for synthesis of thyroid hormone
Sublimation of dry ice physical change
water evaporates from a lake physical change
your chemistry notes are burned chemical
silverware tarnishes chemical
A bar of copper is formed into wire physical
Created by: edith1234
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