A standard solution of Ba(OH)2 (concentration 0.25 mol dm-3) was added to 50 cm3 of a HNO3 solution, concentration unknown. On addition of 28.35 cm3 Ba(OH)2, the equivalence point was reached. What is the concentration (in mol dm-3) of the HNO3 solution?

Which of the following did jj thompson discover about atoms? a)an atom has an internal structure. b) atoms are tiny indivisible particles. c)electrons orbit the nucleus of an atom. d) the nucleus of an atom contains protons and neutrons.

According to the tide table below what time of day will the highest tide occur? (2 pt) the highest tide will occur at

For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate, m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2