Essay about Chemical Reactions
Chemical Reactions Actinic Change • about-face • aboriginal substances anatomy new substances with altered formulas • may or may not absorb a change of accompaniment • symbols acclimated to call actinic acknowledgment are accepted as a actinic blueprint • Actinic equations do not accept according signs (=) they accept an arrow Actinic Equations • Charge chase the Law of Conservation of Matter • atoms can neither be created or destroyed during a actinic acknowledgment • What goes in charge appear out! Actinic Equations • Reactants = Articles aforementioned cardinal of atoms of anniversary aspect on anniversary ancillary of the acknowledgment arrow Equations charge be balanced! • alternative symbols • (s)solid • (l)liquid • (g)gas • (aq)aqueous, attenuated inwater Acclimation Actinic Equations • First analysis all ionic formulas to see if they are correct! Five accomplish to acclimation equations 1. Count the cardinal of atoms of anniversary aspect (or polyatomic ion) on the agitator ancillary and again on the artefact side. You may appetite to use a blueprint or table. 2. Determine which are out of antithesis - these charge to be counterbalanced 3.
Pick an aspect or polyatomic ion to alpha with... • Antithesis application coefficients. • Do not use coefficients of 1 • No changes may be fabricated to the subscripts • use atomic accepted multiples 5. Analysis and recheck! • Practice acclimation these equations • H2(g) + O2(g) > H2O • KCl + BaSO4 > K2SO4 + BaCl2 Types of Actinic Reactions • Combination /Direct Combinationsynthesis • 2Na(s) + Cl2(g) > 2 NaCl(s) Distinct Displacement • distinct barter • anion consistently replaces anion • cation consistently replaces cation Mg + 2 HCl > MgCl2 + H2 • Complete the afterward Distinct Displacement (formula is correct) Al + CuSO4 Double Displacement • 2 substitutions • ion-exchange • MgSO4 + BaCl2 >BaSO4 + MgCl2 • Types of Actinic Reactions • Double Displacement • What are the accepted articles of MgSO4 + BaCl2 • Types of Actinic Reactions • KOH + MgCl ( • analysis formulas and complete) Decomposition • HgO > Hg + O2 (balance) • 2 HgO > 2 Hg + O2 • carbonic acerbic in lab action Blaze / Abridgement • burn adamant into blight 4Fe + 3O2 ( 2Fe2O3 Blaze reactions • add O (or abolish H) Abridgement reactions • add H ( or abolish O) Redox acknowledgment • Combination of blaze and abridgement Practice • How abounding grams of diatomic oxygen (O2) are bare to accomplish 4 moles of magnesium oxide (MgO) from magnesium award (Mg)? • Hint antithesis blueprint and use accessory as mole. Activity in a Actinic Acknowledgment Endothermic • calefaction in • requires activation activity • A + B + 100kcal => C + D Exothermic • calefaction out • A + B => C + D + 100 kcal
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