Write balanced chemical and ionic equations when reactants and products are specified, using state symbols and the smallest whole-number coefficients, and interpret the coefficients as mole ratios.
Tę umiejętność sprawdza 21 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Sodium reacts vigorously with water. (i) Write an equation, with state symbols, for the reaction of sodium with water. (ii) Describe one observation from the reaction in (i). (iii) Sketch, on the axes below, an energy profile for this reaction. Label the…
Aluminium sulfate reacts with barium chloride solution to form a precipitate of barium sulfate and an aqueous solution of aluminium chloride. Al2(SO4)3(aq) + BaCl2(aq) → AlCl3(aq) + BaSO4(s) What is the ratio of the coefficients of barium chloride to…
(i) Suggest, giving a reason for each, two different safety precautions that should be taken when carrying out either of these preparations. (ii) Deduce the coefficients needed to balance the following equation for the reaction of silver with concentrated…
Write an equation for the reaction, including state symbols.
Nitrogen dioxide reacts with rain water and oxygen to form nitric acid. (i) State an equation for this reaction, including state symbols. (ii) Explain, with reference to the oxidation states of two elements, why this is a redox reaction. (iii) Describe the…
What is the coefficient of oxygen when the equation for the complete combustion of butan-1-ol is balanced using the smallest whole numbers? The unbalanced equation is C4H9OH + O2 → CO2 + H2O. A. 4 B. 6 C. 7 D. 13
When the equation for the complete combustion of 1 mol of pentan-1-ol, C5H11OH, is balanced, what is the sum of all the coefficients? Unbalanced equation: C5H11OH(l) + O2(g) → CO2(g) + H2O(l) A. 19 B. 19.5 C. 20 D. 39
Ammonia from sweat and skin-care products reacts with HOBr to form bromamines: NH2Br, NHBr2 and NBr3. (i) Deduce an equation for the reaction of ammonia with HOBr(aq) that produces dibromamine, NHBr2(aq). (ii) The graph shows how…
Write an equation for the complete combustion of C19H40.
Propan-2-ol reacts with tetradecanoic acid to produce propan-2-yl tetradecanoate, an ester used in skin creams. C13H27COOH(l) + CH3CH(OH)CH3(l) ⇌ C13H27COOCH(CH3)2(l) + X(l) (i) Identify the by-product X(l). (ii) Calculate the atom economy of this…
What is the sum of the coefficients when this equation is balanced with the smallest whole numbers? A. 8 B. 9 C. 10 D. 12
Antimony(III) sulfide burns in air to form antimony(III) oxide and sulfur dioxide. Sb2S3(s) + O2(g) → Sb2O3(s) + SO2(g) The equation is balanced using the smallest whole-number coefficients. What is the sum of all the coefficients? A. 8 B. 15 C. 19 D.…
(i) Bronze, an alloy of copper and tin, is used for ship propellers and bearings. Explain, by referring to its structure, why bronze is less malleable than pure copper. (ii) In a separate process, zinc is removed from a copper-zinc alloy by reaction with…
Sucrose, C12H22O11, and the triglyceride glyceryl tripalmitate, C51H98O6, can both be completely oxidized in the body to carbon dioxide and water. Write balanced equations for the complete oxidation of each compound. C12H22O11:…
Which hydrocarbon forms 4 mol of H2O for every 3 mol of CO2 upon complete combustion? A. C3H4 B. C3H6 C. C4H10 D. C3H8
A hydrocarbon burns completely in excess oxygen. The amounts of carbon dioxide and water formed are in the mole ratio 3 : 2. Which hydrocarbon is it? A. C2H6 B. C3H6 C. C3H4 D. C4H10
Ethane burns completely in oxygen to give carbon dioxide and water. C2H6(g) + O2(g) → CO2(g) + H2O(l) What is the C2H6 : O2 mole ratio in the balanced equation, written with the smallest whole-number coefficients? A. 1:3 B. 2:5 C. 2:7 D.…
Liquid octane burns completely in oxygen to give carbon dioxide and liquid water. C8H18(l) + O2(g) → CO2(g) + H2O(l) What is the C8H18 : O2 ratio when the equation is balanced using the smallest whole-number coefficients? A. 1 : 12 B. 1 :…
(i) Write a balanced equation for the reaction of calcium with oxygen to form calcium oxide. (ii) State the block of the periodic table in which calcium is located. (iii) Calcium oxide is a basic oxide. Identify an element in period 3 that forms an amphoteric…
Determine the coefficients needed to balance the equation for the reaction between sodium and water. Na(s) + H2O(l) → NaOH(aq) + H2(g)
A solution of barium hydroxide of concentration 0.10 mol dm−3 was added dropwise to 25 cm3 of copper(II) sulfate solution of concentration 0.10 mol dm−3 until 25 cm3 of the barium hydroxide solution had…
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