Analysis of a Penny 3. Indicate whether the ollowing compounds are soluble (sol)

Question

Analysis of a Penny 3. Indicate whether the ollowing compounds are soluble (sol) or insoluble (insol) in water nsal are (a) NH C (c) Mg(NO3)2 (e) BaSO.4 (g) CuCrO4 (i) ZnS (b) Fe(C2H3O2)3 sol (d) Agl ASCaco, 105(h) AIPO nsol Sol 4. Write a balanced chemical equation for each of the following reactions. (a) potassium (s) chlorine(g) + potassium ch loridels) (b) calcium carbonate(s) calcium oxide(s) carbon dioxide(g) + (c) lithium metal(s) water(1) lithium hydroxide(aq) hydrogen(g) + + (d) lead(II) nitrate(aq) + sodium iodide (aq) lead(II) iodide(s) + sodium nitrate(aq) (e) acetic acid(aq) barium hydroxide(aq) barium acetate(aq) + + water(1) 5. (optional) A 1980 penny weighing 3.079 g reacts with nitric acid to give a blue solution. An electric current is passed through the solution and 2.925 g of copper metal is produced. What is the percentage of copper in the 1980 penny? = 94.19 ertage of o

Explanation / Answer

Solubility of compounds
NH4Cl -soluble

Mg(NO3)2 -soluble

BaSO4 insoluble

CuCrO4 – insoluble

ZnS insoluble

Fe(C2H3O2)3 insoluble

AgI -insoluble

CaCO3 – insoluble

AlPO4 insoluble

Sr(OH)2 – soluble

Balanced chemical equation

1. Potassium(s) + chlorine(g) -- potassium chloride(s)

2K + Cl2 ---- 2KCl

2. Calcium carbonate(s) –------ Calcium oxide(s) + Carbon dioxide(g)

CaCO3 ------CaO + CO2

3. lithium metal + water –--- Lithium hydroxide (aq)+ hydrogen gas

2Li+ 2H2O ----2Li(OH) + H2

4. Lead(II) nitrate(aq) + sodium iodide(aq) –------ Lead nitrate(s) + sodium nitrate(aq)

Pb(NO3)2 + 2NaI ------PbI2+ 2NaNO3

5. acetic acid(aq)+ barium hydroxide(aq) –---- barium acetate(aq) + water (l)

2CH3COOH + Ba(OH)2 ----------(CH3COO)2Ba + 2H2O

i hope you got the idea of balancing chemical reaction

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