A subtance is said to be hygroscopic if it absorbs
A subtance is said to be hygroscopic if it absorbs A. water from the atmosphere to form a…
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Which of the following substances increases in mass when heated in air?
Which of the following substances increases in mass when heated in air? A. Sodium chloride B. lodine crystals…
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution…
Calculate the mass of sodium hydroxide in 5.00 dm3 of a 0.125 mol dm-3 solution [NaOH = 40…
What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at…
What volume of hydrogen will be produced if 100cm3 of ammonia is completely decomposed at constant temperature and…
A major factor coonsidered in selecting a suitable method for preparing a simple salt is…
A major factor coonsidered in selecting a suitable method for preparing a simple salt is its A. crystalline…
The gas given off when NH4Cl is heated with an alkali is
The gas given off when NH4Cl is heated with an alkali is A. H2 B. CI2 C. N…
The conclusion from Rutherford’s from radioactive substance alpha-scattering experiment is that
The conclusion from Rutherford’s from radioactive substance alpha-scattering experiment is that A. atoms are mostly empty space with…
If a metal R forms a compound with the formula R(NO3)2 the formula of its…
If a metal R forms a compound with the formula R(NO3)2 the formula of its tetraoxosulphate (VI) is…
Which of the following decreases when a given mass of gas is compressed to half…
Which of the following decreases when a given mass of gas is compressed to half its initial volume?…
The atomic number of chlorine is 17. What is the number of electrons in a…
The atomic number of chlorine is 17. What is the number of electrons in a chloride ion? A.…