Chemistry, 28.09.2019 01:20 needhelpwithHW10
For water, ebulioscopic constant is ke = 0.52 k dmmol 1 and cryoscopic constant kc = 1.86 k dm' moll, respectively. the 0.710 g sample of na2so4 (mr =142.0) was dissolved in water, so that 250 cm of the aqueous solution was prepared. disregarding the osmotic coefficient, calculate a)-c): a) boiling temperature of the prepared solution at normal pressure. a) 100.03°c; b) freezing temperature of the solution. b)-0.112 °c c) osmotic pressure of the solution (p) at 0°c and 25°c.; p=136 kpa (0°c) and 149 kpa (25°c); d) aqueous solution of kcl with concentration 0.5 mol dm freezes at -1.66°c. calculate the osmotic coefficient (o) of this solution. d) = 0.892
Answers: 1
Chemistry, 21.06.2019 14:20
Which of the following statements is not true? • a. covalent compounds have low melting and boiling points. • ob. covalent bonds between atoms of a compound are relatively weak compared to bonds between molecules. • c. covalent bonds occur between nonmetals. • d. covalent compounds are often gases or liquids.
Answers: 2
Chemistry, 22.06.2019 13:30
In a ni-cd battery, a fully charged cell is composed of nickelic hydroxide. nickel is an element that has multiple oxidation states. assume the following proportions of the states: nickel charge proportions found 0 0.17 +2 0.3 +3 0.33 +4 0.5 (a) determine the mean of the nickel charge. enter the answer to 2 decimal places.(b) determine the cumulative distribution function of nickel charge.
Answers: 2
Chemistry, 22.06.2019 14:20
7. in the cycle, a virus integrates its dna into the host's dna, and its dna is replicated when the host dna is replicated. a. infectious b. retroviral c. lysogenic d.lytic
Answers: 1
Chemistry, 22.06.2019 21:20
One way in which the useful metal copper is produced is by dissolving the mineral azurite, which contains copper(ii) carbonate, in concentrated sulfuric acid. the sulfuric acid reacts with the copper(ii) carbonate to produce a blue solution of copper(ii) sulfate. scrap iron is then added to this solution, and pure copper metal precipitates out because of the following chemical reaction: (s) (aq) (s) (aq) suppose an industrial quality-control chemist analyzes a sample from a copper processing plant in the following way. he adds powdered iron to a copper(ii) sulfate sample from the plant until no more copper will precipitate. he then washes, dries, and weighs the precipitate, and finds that it has a mass of .
Answers: 2
For water, ebulioscopic constant is ke = 0.52 k dmmol 1 and cryoscopic constant kc = 1.86 k dm' moll...
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