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The vulcanizer's solution is prepared by dissolving rubber in
When a few drops of water is added to a blue anhydrous cobalt (II) chloride, the colour changes to
In the course of purifying water for town supply the water is passed through large settlings tanks, containing sodium aluminate (III) to remove?
Air boiled out of water as steam is richer in
\( _{11} ^{23}Na + _0^1n → _{11}^{24}Na \)
The reaction above is an example of
In the periodic table, the electrical and thermal conductivities are properties of elements that
The diagram above represent the electron sub-level for
The atom of an element X is represented as \(_z^yX\). The basic chemical properties of X depends on the value of
The experiment that showed that atoms have tiny positively charged nucleus was first carried out by
Diffusion is slowest in solid particles than in particles of liquid and gases because
300 cm3 of gas has a pressure of 800 mmHg. If the pressure is reduced to 650 mmHg, find its volume
16.8 g of sodium hydrogen trioxocarbonate (IV) is completely decomposed by heat. Calculate the volume of carbon(IV) oxide given off at s.t.p
[Na 23, C = 12, O = 16, H = 1, Molar volume of a gas at s.t.p = 22.4 dm3]
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]
In countries where the temperature falls below 273K, salt is always sprinkled on the icy road in order to
Chlorophyll obtained from green leaves of plant can be shown to be composed of more than one coloured component by the technique of