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Which property of a gas affects the rate at which it spreads throughout a laboratory? boiling point, molecular mass, reactivity, solubility in water
Which pair of substances are both mixtures? air; water, limewater; water, sea-water; air, sea-water; ethanol
Gas X • has no effect either on damp red litmus paper or on damp blue litmus paper, • puts out both a glowing splint and a burning splint. What is gas X? ammonia, carbon dioxide, chlorine, nitrogen
What is the structure of the ion 90/38 2 Sr + ? protons 38 neutrons 52 electrons36, protons 38 neutrons 52 electrons 38, protons 38 neutrons 90
In which substance is each carbon atom covalently bonded to only three other atoms? carbon dioxide, diamond, graphite, methane
In which pair of substances does each have a giant molecular structure? diamond, iodine, diamond, silica (sand), iodine, methane, methane, silica (sand)
How does a magnesium atom form a bond with an oxygen atom? by giving one pair of electrons to the oxygen atom, by sharing one pair of electrons, both electrons
Metals have positive ions in a ‘sea of electrons’. Which metal atom provides most electrons for the sea? aluminium, calcium, magnesium, sodium
The element X forms a gaseous molecule X2. One volume of X2 combines with one volume of hydrogen to form two volumes of a gaseous hydride. What is the formula for the hydride of X? HX, HX2, H2X, H2X2
Which substance has the highest percentage by mass of nitrogen? NH4NO3 Mr = 80, (NH4)2SO4 Mr = 132, CO(NH2)2 Mr = 60, (NH4)3PO4 Mr = 149
In which change is the nitrogen reduced? NH3 to NO , NH3 to NO3-, N2 to NH3, N3– to N2
The equation shows the reaction for the formation of sulphur trioxide. 2SO2(g) + O2(g) 2SO3(g) ?H = –197 kJ Which change in reaction conditions would produce more sulphur trioxide? adding more catalyst, decreasing the pressure, increasing the temperature, removing some sulphur tri
Which salt can be prepared by an acid-alkali titration method? ammonium sulphate, copper(II) sulphate, iron(II) sulphate, zinc sulphate
The option shows properties of four chlorides. Which is magnesium chloride? colour green solubility in water soluble method of preparation metal and acid, colour
Why is ethanoic acid described as a weak acid? It is only slightly ionised in water., It is a poor conductor of electricity., It is an organic acid
Which pair of substances produce a precipitate when their aqueous solutions are mixed? barium nitrate, silver nitrate, sodium chloride, barium nitrate, sodium nitrate, barium chloride, so
Ammonia may be obtained from ammonium chloride by heating with : aqueous calcium chloride., aqueous sodium hydroxide, dilute hydrochloric acid., water.
Rubidium, Rb, is an element in Group I of the Periodic Table. Which statement about rubidium is correct? It reacts slowly with water., It forms an insoluble hydroxide., It is liberated at the cathode durin
The element sulphur, S, is in Group VI of the Periodic Table. Which formula is incorrect? S2–, S 2O3, SO2?/4, SO3
The option shows some of the properties of four elements. Which element is most likely to be a transition metal? melting point °C 3550density g / cm3 3.5 electrical conductivity poor, melting point °C 18
Which equation represents the reaction of calcium with cold water? Ca + H2O ? CaO + H2, 2Ca + 2H2O ? 2CaOH + H2, Ca + 2H2O ? Ca(OH)2 + H2, Ca + 2H2O ? Ca(OH)2 + 2H2
A coil of clean copper wire is suspended in aqueous silver nitrate. Crystals of silver are deposited on the copper wire. Which statement is not correct? The copper is oxidised., The total mass of the crystals of silver increases gradually., The total nu
Zinc and aluminium both react with dilute hydrochloric acid.Why does zinc react more quickly than aluminium? Aluminium is lower than hydrogen in the reactivity series., Aluminium has an oxide coating., Zinc i
Which metal is used in the sacrificial protection of iron pipes? copper, lead, magnesium, sodium
Some metals can be obtained by the reduction of their oxides with hydrogen.Which line of the table is correct? key X = cannot be obtained ? = can be obtained aluminium ? copper ? silver X sodium X , aluminium X copper ? silver ? sodium
Which gas burns in air to form a single product? ammonia, carbon monoxide, hydrogen chloride, methane
Which pair of statements about the combustion of a carbohydrate and its formation by photosynthesis is not correct? reaction exothermic reaction endothermic, oxygen used up oxygen set free, no catalyst needed
Which compound is obtained by the oxidation of ethanol, C2H5OH? HCO2CH3, C2H5CO2H, CH3OH, CH3CO2H
Which statement applies to all three of the compounds ethane, ethene and ethanol? One molecule of each compound contains the same number of carbon atoms., One mole of each compound c
What is the empirical formula of ethanoic acid? CH2O, CH4O, C2H3O, C2H4O2
Some metals can be obtained by the reduction of their oxides with hydrogen.Which line of the table is correct? key X = cannot be obtained ? = can be obtained aluminium ? copper ? silver X sodium X , aluminium X copper ? silver ? sodium
Some metals can be obtained by the reduction of their oxides with hydrogen.Which line of the table is correct? key X = cannot be obtained ? = can be obtained aluminium ? copper ? silver X sodium X , aluminium X copper ? silver ? sodium