Represent observed chemical changes with balanced chemical equations below a. magnesium + magnesium chloride b. zinc + magnesium chloride C. copper + magnesium chloride d. iron + magnesium chloride e. magnesium + zinc chloride

Q: In a chemical reaction, what is the limiting reactant?

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A: Formula Used No. of moles = weight /molecular weight

Q: 1. Zinc. Zn. reacts with Sulfur, S. according, to the reaction: Zn + Sn - Zns Balance the chemical…

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Q: UNIT PRACTICE AND REVIEW 7. Use the concept of a mole to explain why a chemical reaction may not…

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A: Mass of Zn = 2400 mg × 1g/1000 mg  = 2.40 g Moles of Zn = mass /molar mass   = 2.40 /65.38  = 0.0367…

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Q: Why are coefficients used in mole ratios instead ofsubscripts?

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Q: 1. What is stoichiometry?

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Q: any grams of iron (III)

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Q: Element Color Key # of Atoms # of Atoms (Reactants) (Products)

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Q: 31. Bal, contains 64.9% I. How many grams of barium are in 26.50g barium iodide (Bal, ?

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Q: How many oxygen atoms are present in a molecule of iron (III) carbonate?

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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.