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Which is an anion that is present in the solution formed when an excess of dilute hydrochloric acid is added to calcium carbonate? Ca2+, Cl-, CO2-/3, H+
Which pair of elements, when combined together, do not form a covalent compound? caesium and fluorine, nitrogen and chlorine, phosphorus and fluorine, sulfur and chlorine
What is the mass of one mole of carbon-12? 0.012 g , 0.024 g , 1 g , 12 g
Two different hydrocarbons each contain the same percentage by mass of hydrogen.It follows that they have the same empirical formula., number of isomers., relative molecular mass., structural formula
Which statement about catalysts is correct for a typical equilibrium reaction? A catalyst can be either an inorganic or an organic species, A catalyst does not take part in the re
When a solution containing silver ions is added to a solution containing iron(II) ions, an equilibrium is set up. Ag+(aq) + Fe2+(aq) Ag(s) + Fe3+(aq) The addition of which substance would not affect the amount of silver precipitated? Ag+(aq), Fe2+(aq), Fe3+(aq), H2O(l)
Which reaction does not involve either oxidation or reduction? CH4(g) + 2O2(g) ? CO2(g) + 2H2O(g), Cu2+(aq) + Zn(s) ? Cu(s) + Zn2+(aq), CuO(s) + H2SO4(aq) ? CuSO4(
Which pair of compounds could be used in the preparation of calcium sulfate? calcium carbonate and sodium sulfate, calcium chloride and ammonium sulfate, calcium hydroxide and b
A metal reacts with dilute hydrochloric acid to produce a gas. What is used to identify this gas? a glowing splint, a lighted splint, damp blue litmus paper, limewater
Titration of an acid against a base is a method often used in the preparation of salts. Which properties of the acid, the base and the salt are required if this method is to be used? insoluble insoluble insoluble, soluble insoluble insoluble, soluble solubl
Which row shows the correct number of protons and electrons in the ion of an element in Group II of the Periodic Table? 9 10, 12 10, 14 14, 16 18
The oxide of an element X increases the rate of decomposition of hydrogen peroxide. At the end of the reaction the oxide of X is unchanged. Which details are those of X? proton number 18 mass number 40, proton number 20 mass number 40, proton number
Which element is sodium? melting point in °C 1535 electrical conduction good density in g / cm3 7.86, melting p
Which substances react together to give hydrogen? calcium oxide and water, copper and dilute sulfuric acid, copper and steam, magnesium and steam
In the extraction of iron, carbon monoxide acts as a catalyst., an inert gas., an oxidising agent., a reducing agent
An alloy of copper and zinc is added to an excess of dilute hydrochloric acid. Which observations are correct? residue grey filtrate blue solution, residue none filtrate blue solution, residue none
Which compound will not produce ammonia when heated with ammonium sulfate? calcium oxide, magnesium oxide, sodium hydroxide, sulfuric acid
These reactions are used in the manufacture of sulfuric acid. P S + O2 ? SO2 Q 2SO2 + O2 2SO3 R SO3 + H2O ? H2SO4 Which reactions are speeded up by using a catalyst? P only, Q only , R only , Q and R
Why is carbon used in the purification of drinking water? It desalinates the water., It disinfects the water., It filters out solids., It removes tastes and
Which gas burns in air to form only one product? ammonia, carbon monoxide, hydrogen chloride, methane
The list shows three chemical reactions. 1 combustion of ethanol 2 fermentation of glucose 3 reaction of ethanol with ethanoic acid to give an ester In which reactions is water a product? 1 and 2 only, 1 and 3 only, 2 and 3 only, 1, 2 and 3
Which substances will burn in air and give carbon dioxide amongst the combustion products? 1 calcium carbonate 2 ethane 3 ethanol 4 methanol 1 and 2 only, 2 and 3 only , 1, 2 and 3 only, 2, 3 and 4 only
The macromolecules of proteins, fats and carbohydrates can all be broken down into their simple units by a similar process. What is the process called? esterification, hydrolysis, oxidation, reduction