How many structural isomers can be written for the alkyl bromide, C4H9Br?
3
4
6
8
Correct answer is B
No explanation has been provided for this answer.
Sulphur (IV) oxide hydrogen chloride
Carbon (IV) oxide and amonia
Amonia and hydrogen chloride
Carbon (IV) oxide and surphur (IV) oxide
Correct answer is C
No explanation has been provided for this answer.
A property of a colloidal dispersion which a solution does not have is?
the Tyndall effect
homogeneity
osmotic pressure
surface polarity
Correct answer is A
No explanation has been provided for this answer.
A sample of temporary hard water can be prepared in the laboratory by?
disolving calcium chloride in distilled water
saturating lime water with carbon (IV) oxide
saturating distilled water with calcium hydroxide
dissolving sodium hydrogen trioxocarbonate (IV) in some distilled water
Correct answer is B
No explanation has been provided for this answer.
57.5
42.2
28.6
14.3
Correct answer is D
solute + solvent = solution
at 100oC; 75g + 100g = 175g
at30oC; \(\frac{25g}{50g}\) + 100g = 125g
From 100oC - 30oC; 175g CuSO4 ppt 50g
From 100oC - 30oC; 50g CuSO4 ppt \(\frac{50 \times 50}{175}\) = 14.3