The solublity rules for ionic compounds are shown in the textbook on page 330. However, as you know, you can't bring the textboo
k with you to exams. The solubility rules are also shown on the bottom of the Exam Information Sheet. Because this is a tool that you CAN access during excams, you need to practice using these solubility nules. Using the solubility rules on the Exam Information Sheet, predict whether the following compounds are soluble or insoluble in water. Use the drop-down menus provided. NIS | [ Select ] Mg3(POs)2 Select ) Li2CO3 ISelect ] NH4CI I Select ) 1 pts D Question 6 Which of the following best describes the solute in an aqueous solution of sucrose or C12H2201 (aq)? o c4t H' and o? ions C, H and O atoms C12H22011 molecules C atoms and H20 molecules
<em>Predict whether the following compounds are soluble or insoluble in water.</em>
Based on the solubility rules we can say:
NiS: Sulfides of transition metals are highly insoluble.
Mg₃(PO₄)₂: All phosphates (except those with metals of Group 1) are insoluble so Mg₃(PO₄)₂ is insoluble.
Li₂CO₃: all salts of metals of Group 1 are soluble so Li₂CO₃ is soluble.
NH₄Cl: all salts of ammonium are soluble so NH₄Cl is soluble.
<em>Which of the following best describes the solute in an aqueous solution of sucrose or C₁₂H₂₂O₁₁(aq)?</em>
Sucrose is a molecular compound in which atoms are linked through covalent bonds. Thus, it does not ionize in water (is a non-electrolyte) and when it dissolves it exists as C₁₂H₂₂O₁₁ molecules.
The second law of thermodynamics deals with interconversion of energy from one form to another. Although energy can be converted from one form to another, this conversion is never 100% efficient because energy is lost in certain ways such as through heat. In a combustion engine, it is not possible to recover the energy from the gasoline 100% since energy must be lost along the way via such means as heat losses. Hence I will be skeptical about such an advert.
