A1.00 l buffer solution is 0.250 m in hf and 0.250 m in lif. calculate the ph of the solution after the addition of 0.150 moles of solid lioh. assume no volume change upon the addition of base. the ka for hf is 3.5 × 10-4. a 1.00 l buffer solution is 0.250 m in hf and 0.250 m in lif. calculate the ph of the solution after the addition of 0.150 moles of solid lioh. assume no volume change upon the addition of base. the ka for hf is 3.5 × 10-4. 4.06 3.63 3.46 2.85 4.24

Which lists the main components of darwin’s theory of evolution? a. random mutations drive evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms do not change. b. natural selection drives evolution; the evolution of a population happens slowly; organisms have common ancestors; organisms change over time. c. natural selection drives evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms change over time. d. random mutations drive evolution; the evolution of a population happens rapidly; organisms have common ancestors; organisms do not change.

Looking at this barometer, is the air pressure high or low? what type of weather would you expect? high, bad low, bad high, good low, good

Beryl states that insulation with the smallest possible thermal conductivity is best to keep a house warm in winter, but worst for keeping a house cool in summer. sapphire insists the reverse is true: low thermal conductivity is good in the summer, but bad in the winter. which one, if either is correct? a. beryl, because low thermal conductivity results in low heat transfer. b. beryl, because low thermal conductivity results in high heat transfer. d. sapphire, because low thermal conductivity results in high heat transfer. e. neither, because low heat transfer is desirable both in summer and in winter.