ХИМИЯ НА АНГЛИЙСКОМ КОНТРОЛЬНАЯ ) 1) 49g of potassium chlorate KClO₃ was burned and KCl and oxygen gas were formed. Calculate the volume of gas formed. (STP).
2) Calculate the volume of 5 mol of chlorine gas.
3) Iron 33,6 g reacted with chlorine gas (Cl₂). Calculate the mass of iron (III) chloride (FeCl₃).
4) Calculate the relative density (D) of ammonia gas NH₃ by hydrogen gas.
5) Balance the equations:
a) Al + AgNO₃→ Al(NO₃)₃ + Ag
b) Fe + H₂O → Fe₃O₄ + H₂
c) NH₃ + H₂SO₄→ (NH₄)₂SO₄
d) N₂O₅ + H₂O → HNO₃
6) 108g of aluminium reacted with sulphur. Calculate the amount of heat given off. The thermochemical equation is: 2Al + 3S = Al₂S₃ + 509 kJ
7) Name exothermic or endothermic reactions:
a) Decomposition of limestone at high temperature -
b) Wood burning -
c) Firework – heat is given off.-
d) Baking soda decomposition – heat is taken in -
8) Calculate the Mr(Mg(NO₃)₂) = ___ + ___ + + ___ =
9) True /False:
a) Oxygen has three main isotopes. T /F
b) Oxygen gas is slightly soluble in water. T /F
c) Oxygen is needed for combustion . T /F
d) Ozone contains four oxygen atoms. T /F

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