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A sample of a compound containing carbon and oxygen have a mass of 132 g. Experimental procedures showed that 36 g of this sample was carbon and the remaining 64g was oxygen. what is the percentage composition of the compound?
how to different between silver cholride and silver phosphate we can use
Shape form by sp3 hybridizationion
find the reducible representation of all seven f orbitals pointing towards iodine
Consider the following reaction: 2 Al (s) + 3Cl2 (g) AlCl3 (s) ΔHrxn = -1390.81 kJ/molrxn (a) Is this reaction exothermic or endothermic? Justify your answer.
(a) Is this reaction exothermic or endothermic? Justify your answer. (5 points)
(b) Calculate the amount of energy transferred when 310.0 g of AlCl3 forms. Include units and proper sign in your answer. Show all work. (10 points)
(c) How many grams of Al are required when 500.0 J of energy are transferred? Include units and proper sign in your answer. Show all work. (10 points)
1) How many mg of hcl are in 20/ml of the juice with ph 2 molar mass of hcl is 36.5 what is OH minus ions concentration in a solution with PH 2 ?
2) what is physiological range of blood pH ? How the increase of carbon dioxide can influence pH of the blood ? What should be the ratio between the components of the bicarbonate buffer to keep pH of the blood in physiological range ?
3) 0.9% (m/v) Nacl ( 58.5G/mole ) solution is physiological solution . Explain in words or calculation if 10 %of (m/v) saccharose (sucrose) (342g/m) solution can be treated as physiological solution
4 ) There are two water solutions 2 moles/dm*3 glucose (180g/mole ) and 2 moles /dm*3 kcal 74.5G/mole a) explain if the solution is isotonic b) which has lower melting melting point
On crossing a plant with red fruit and hairy stem, with one that was yellow fruit
and hairy stem, the following progeny were obtained:
30 red, hairy / 11 red, smooth / 29 yellow, hairy / 9 yellow, smooth
Give a reasoned explanation along with the use of full genetic diagrams to
proof your answer, to explain these results in terms of the simultaneous
transmission of characteristics.
1-Chloropropane was hydrolysed by an aqueous potassium hydroxide solution.
C3H7Cl + KOH → C3H7OH + KCl
1-Chloropropane Propan-1-ol
During the reaction, the reactant potassium hydroxide is used up. Samples of the reaction mixture were drawn off at regular time intervals and analysed by titration with standard hydrochloric acid to find out the concentration of KOH.
The results are given in the table below:
Time / s
Concentration of OH- / mol dm-3
0
0.500
100
0.350
200
0.250
300
0.180
400
0.125
500
0.090
600
0.063
700
0.040
800
0.030
From the above information, Plot a Concentration of OH- (mol dm-3) against Time (s) graph. The graph MUST be a hand drawn (plotted) graph.
(b)
Select 4 suitable points along your graph [see part (a)] and draw tangents to find the rates. Construct a table of “Rate” against “Concentration”. Note: The rates need to be calculated and the calculations shown.
(c)
Plot a graph of Rate against Concentration of OH-. The graph MUST be a hand drawn (plotted) graph.
(d)
From your graph in part (c) deduce the Order of Reaction with respect to OH- (hydroxide ions).
(e)
Write a rate equation with respect to concentration of hydroxide ions.
(f)
Calculate the rate constant k from the gradient of the graph, drawn in part (c). Show and explain your working.
A solution of 0.15M NH3 is only 1.1% ionized in solution. Calculate the pH. The Kb of ammonia is 1.8*10^-5
On crossing a plant with red fruit and hairy stem, with one that was yellow fruit and hairy stem, the following progeny were obtained:
30
red, hairy / 11 red, smooth /
2
9 yellow, hairy / 9 yellow, smooth
Give a reasoned explanation along with the use of full genetic diagrams to proof your answer, to explain
these results in terms of the simultaneous transmission of characteristics.
