Which of the following will give a buffer with a pH near 4.76 when the acid and conjugate base are mixed in equimolar proportions? AcidKaNH4+ (from ammonia)5.69 ´ 10-10HC2H3O2 (acetic acid)1.75 ´ 10-5HF (hydrofluoric acid)6.8 ´ 10-4CH3CH2NH3+ (from ethylamine)2.12 ´ 10-11

Population growth will be the same for all regions of the world based on the United Nations 2100 projections.

A voltaic cell is based upon the following overall reaction:2H+(aq) + Pb(s) + SO42-(aq) ® H2(g) + PbSO4(s)where Eº = +0.356 V. Calculate the equilibrium constant at 25ºC? (R = 8.31 J/K·mol, F = 96480 C/mol e-)

Which of the following aqueous solutions should have the lowest freezing point?

Germplasm is any living tissue from a plant that can be used to grow a plant.

Given the initial rate data for the reaction A + B ® C, determine the rate expression for the reaction., M, MD/Dt (initial) M/s0.2500.1508.90 ´ 10-60.2500.3001.78 ´ 10-50.5000.3007.12 ´ 10-5

Which of the following liquids are likely to be miscible with water: 1-propanol (CH3CH2CH2OH), carbon tetrachloride (CCl4), hexane (C6H14), and acetic acid (CH3CO2H)?

Which of the statements concerning the two molecules below are correct?1.The molecules are unsaturated hydrocarbons.2.The molecules are structural isomers.3.The molecules are alkanes.

What is the relationship between molar solubility, x, (or s) and Ksp for calcium fluoride?

Which salt forms a 0.10 M aqueous solution with the lowest pH?