Definition Definition Transformation of a chemical species into another chemical species. A chemical reaction consists of breaking existing bonds and forming new ones by changing the position of electrons. These reactions are best explained using a chemical equation.
Chapter 1, Problem 92AE
(a)
Interpretation Introduction
To determine: If the given statement “Air and water are both elements.” is correct; the correct version of this statement.
(b)
Interpretation Introduction
To determine: If the given statement “All mixtures contain at least one element and one compound.” is correct; the correct version of this statement.
(c)
Interpretation Introduction
To determine: If the given statement “Compounds can be decomposed into two or more other substances; element cannot.” is correct; the correct version of this statement.
(d)
Interpretation Introduction
To determine: If the given statement “Elements can exist in any of the three states of matter.” is correct; the correct version of this statement.
(e)
Interpretation Introduction
To determine: If the given statement “When yellow stains in a kitchen sink are treated with bleach water, the disappearance of the stains is due to a physical change.” is correct; the correct version of this statement.
(f)
Interpretation Introduction
To determine: If the given statement “A hypothesis is more weakly supported by experimental evidence than a theory.” is correct; the correct version of this statement.
(g)
Interpretation Introduction
To determine: If the given statement “The number 0.0033 has more significant figures than 0.033 .” is correct; the correct version of this statement.
(h)
Interpretation Introduction
To determine: If the given statement “Conversion factors used in converting units always have a numerical value of one.” is correct; the correct version of this statement.
(i)
Interpretation Introduction
To determine: If the given statement “Compounds always contain at least two different elements.” is correct; the correct version of this statement.
Calculate the free energy of formation of 1 mol of Cu in cells where the electrolyte is 1 mol dm-3 Cu2+ in sulfate solution, pH 0. E° for the Cu2+/Cu pair in this medium is +142 mV versus ENH.Assume the anodic reaction is oxygen evolution.Data: EH2 = -0.059 pH (V) and EO2 = 1.230 - 0.059 pH (V); 2.3RT/F = 0.059 V
If the normal potential for the Fe(III)/Fe(II) pair in acid at zero pH is 524 mV Hg/Hg2Cl2 . The potential of the saturated calomel reference electrode is +246 mV versus the NHE. Calculate E0 vs NHE.
Given the galvanic cell whose scheme is: (-) Zn/Zn2+ ⋮⋮ Ag+/Ag (+). If we know the normal potentials E°(Zn2+/Zn) = -0.76V and E°(Ag+/Ag) = 0.799 V. Indicate the electrodes that are the anode and the cathode and calculate the E0battery.
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