Consider a double replacement reaction between Zinc (ll) chloride and sodium hydroxide: ZnCl2+NaOH ==> Complete the chemical equation by: Step 1: Rewrite it to include electrically-neutral ionic product formulas for each formula. Hint for step 1: instead of just writing the product formulas rewrite the entire equation. Concerning the "electrically neutral" part, for example, Na + Cl2 ==> were your reactants, you would not predict NaCl2 as a chemical product because that is not an electrically neutral compound formula. The Na would have a +1 charge and the Cl would have a -1 charge, 2 (-1) charges would give an overall -2 charge which would not produce an overall 0 charge. Step 2: Balance it. Step 3: Add subscripts (aq, I, s, or g) to show how the reactants combine and which product will precipitate to be collected as a solid.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
Consider a double replacement reaction between Zinc (ll) chloride and sodium hydroxide:
ZnCl2+NaOH ==>
Complete the chemical equation by:
Step 1: Rewrite it to include electrically-neutral ionic product formulas for each formula.
Hint for step 1: instead of just writing the product formulas rewrite the entire equation. Concerning the "electrically neutral" part, for example, Na + Cl2 ==> were your reactants, you would not predict NaCl2 as a chemical product because that is not an electrically neutral compound formula. The Na would have a +1 charge and the Cl would have a -1 charge, 2 (-1) charges would give an overall -2 charge which would not produce an overall 0 charge.
Step 2: Balance it.
Step 3: Add subscripts (aq, I, s, or g) to show how the reactants combine and which product will precipitate to be collected as a solid.
Step 4: Provide subscripts for both reactants and both products.
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