In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
See more
2008
Chlorophyll obtained from given leaves of plant can be shown to be composed of more than one coloured component by the technique of
See more
2008
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
See more
2008
Diffusion is slowest in solid particles than in particles of liquid and gases because
See more
2008
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
See more
2008
16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off s.t.p [Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]
See more
2008
2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g)From the equation above, calculate the mass of sodium hydroxide produced by 2.3g of sodium.[H = 1, O = 16, Na = 23]
See more
2008
Air boiled out of water as steam is richer in
See more
2008
\( _{11} ^{11}Na + _0^1n → _{11}^{24}Na \)The reaction above is an example of
See more
2008
In the periodic table, the electrical and thermal conductivities are properties of elements that
See more
2008
The diagram above represent the electron sub-level for
See more
2008
The uncovered raw food that is sold along major roads is likely to contain some amounts of
See more
2008
117.0g of sodium chloride was dissolved in the solubility in 1.0dm3 of distilled water at 25oC. Determine the solubility in mol dm-3 of sodium chloride at that temperature [Na = 23, Cl = 35.5]
See more
2008
The vulcanizer's solution is prepared by dissolving rubber in
See more
2008
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
See more
2008
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove
See more
2008
The oxidation state of carbon in HCOOH is
See more
2008
Insoluble salts can be prepared by
See more
2008
0.05 mol dm-3 HCl is neutralized by 25 cm3 NaOH. If the volume of acid used is 32.00cm3, what is the concentration of the base