Pj Problems - Overview
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7 Spaces Of Interest - Overview
Triadic Unit Mesh
States Of Matter
COHN - Natures Engineering Of The Human Body
The Human-Body Systems
Faith, Love, Charity
(a)The following question is posed to a student: "what causes electrolyte solutions to conduct electricity? The student responds that electricity conduction in electrolyte solutions is due to the movement of electrons. Is the student correct? If not what is the correct answer?
(b) What property of water facilitates the dissolution of ionic solids into strong electrolytes?
(c) Indicate the ions present in water when the following substances dissolve in water:
(i) ZnCl2 (ii) HNO3 (iii) (NH4)2SO4 (iv) Ca(OH)2
(d) Formic acid, HCHO2, is a weak electrolyte. What solute particles are present in an aqueous solution of formic acid? Write the chemical equation for the ionization of HCHO2.
S7P4A41 (motion - linear).
Pj Problem of Interest is of type motion (linear).
(a) The student is incorrect. Electrolyte solutions conduct electricity because the ions in the solution carry charge through the solution from one electrode to another.
(b) A water molecule is a polar molecule. Water molecules are generally neutral. However, the distribution of their electrons are uneven. So, there is a positive end and a negative end. This characteristic allows the positive end to be attracted to the anion of the ionic compound and the negative end to be attracted to the cation of the ionic compound. Thus a separation of the ionic compound occurs.
(ci) ZnCl2(aq) -------> Zn2+(aq) + 2Cl-(aq)
(ii) HNO3(aq) -------> H+(aq) + NO3-(aq)
(iii) (NH4)2SO4(aq) -------> 2NH4+(aq) + SO42-(aq)
(iv) Ca(OH)2(aq) ------->Ca2+(aq) + 2OH-(aq)
(d) H+ and CHO- are the solute particles.
HCHO2(aq) -------> H+(aq) + CHO-(aq).
The point . is a mathematical abstraction. It has negligible size and a great sense of position. Consequently, it is front and center in abstract existential reasoning.
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