Zadanie 1
0.20 mol of ammonium hydrogencarbonate is heated gently until all of the solid has decomposed. NH4HCO3(s) → NH3(g) + H2O(g) + CO2(g) How many moles of gas are produced? A. 0.20 B. 0.40 C. 0.60 D. 0.80
Chemistry SL Paper 1, May 2022, TZ1
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Dodaj cały arkusz do zestawuZadanie 2
Which sample contains the fewest moles of HBr? NA = 6.02 × 1023 mol−1. Molar volume of an ideal gas at STP = 22.7 dm3 mol−1. A. 0.647 g of HBr(g) B. 50.0 cm3 of…
Zadanie 3
A compound has the empirical formula CH2Cl and a relative molecular mass of 99. What is the molecular formula of the compound? A. CH2Cl B. C2H4Cl2 C. C3H6Cl3 D. C4H8Cl4
Zadanie 4
A 7.60 g sample of an oxide of nitrogen contains 4.80 g of oxygen. What is the empirical formula of the oxide? A. N2O B. NO2 C. N2O3 D. N2O5
Zadanie 5
Bromine has two naturally occurring isotopes, and . The relative atomic mass of bromine is 79.90. What is the approximate percentage abundance of ? A. 25 % B. 45 % C. 55 % D. 75 %
Zadanie 6
What is the maximum number of electrons that can occupy a single orbital of the 4d sublevel? A. 2 B. 5 C. 10 D. 14
Zadanie 7
Which oxides form an acidic solution when they react with water? I. sulfur trioxide II. phosphorus(V) oxide III. calcium oxide A. I and II only B. I and III only C. II and III only D. I, II and III
Zadanie 8
Which is the electron configuration of an atom of a metallic element? A. [He] 2s2 2p3 B. [Ne] 3s2 3p5 C. [Ar] 3d6 4s2 D. [Ar] 3d10 4s2 4p4
Zadanie 9
A compound consists of Al3+ and SO42− ions. What are the name and formula of the compound? A. Aluminium sulfite, Al2(SO3)3 B. Aluminium sulfate, Al3(SO4)2 C. Aluminium sulfide, Al2S3 D. Aluminium sulfate, Al2(SO4)3
Zadanie 10
Which statement explains the high melting point of magnesium oxide? A. Strong covalent bonds between magnesium and oxygen atoms must be broken B. Strong intermolecular forces hold magnesium oxide molecules together C. A large amount of energy is needed to…
Zadanie 11
Which molecule is the most polar? A. CO2 B. CCl4 C. H2S D. H2O
Zadanie 13
Burning 0.500 g of propan-1-ol, CH3CH2CH2OH, heats 200 g of water by 12.4 K. Specific heat capacity of water: 4.18 J g−1 K−1. What is the enthalpy of combustion of propan-1-ol, in…
Zadanie 14
The enthalpy changes of two reactions of nitrogen oxides are given. N2(g) + O2(g) → 2 NO(g) ΔH = +180 kJ 2 NO2(g) → 2 NO(g) + O2(g) ΔH = +114 kJ What is the enthalpy change, in kJ, of the following reaction?…
Zadanie 15
The potential energy profile of a reaction is shown. Which statement correctly describes the reaction? A. Endothermic; the products have a lower potential energy than the reactants B. Endothermic; the products are less stable than the reactants C. Exothermic;…
- Materiał graficzny
Zadanie 16
Excess calcium carbonate reacts with 25 cm3 of hydrochloric acid of concentration 1.0 mol dm−3 in an open flask. The solid line shows how the decrease in mass of the flask and its contents changes with time. The experiment is…
- Materiał graficzny
Zadanie 17
A student monitors the rate of a reaction using a colorimeter. In which mixture would the absorbance change as the reaction proceeds? A. NaOH(aq) + HNO3(aq) B. KCl(aq) + I2(aq) C. KI(aq) + Cl2(aq) D. CH3COOH(aq) + KOH(aq)
Zadanie 18
At a certain temperature, Kc = 12 for the reaction What is the value of Kc, at the same temperature, for the reaction below? H2(g) + Br2(g) ⇌ 2 HBr(g) A. 122 B. 2 × 12 C. D.…
Zadanie 19
Which species are Brønsted–Lowry acids in the equilibrium below? HCO3−(aq) + H2O(l) ⇌ H3O+(aq) + CO32−(aq) A. HCO3− and H2O B. H2O and CO32− C. H3O+ and CO32− D. HCO3− and H3O+
Zadanie 20
Which 0.10 mol dm−3 aqueous solution has the lowest pH? A. CH3COOH B. HCl C. H2SO4 D. NH4Cl
Zadanie 21
In which species would nitrogen be oxidized if it were converted to N2O? A. NO2 B. NH4+ C. HNO3 D. N2O3
Zadanie 22
Which statement is correct for the cathode in both a voltaic cell and an electrolytic cell? A. It is the positive electrode B. It is the negative electrode C. Anions move towards it D. Reduction takes place at it
Zadanie 23
The half-equation below is balanced using the lowest possible whole-number coefficients. a Cr2O72−(aq) + b H+(aq) + c e− → d Cr3+(aq) + f H2O(l) What is the value of c? A. 3 B. 6 C. 7 D. 14
Zadanie 24
Which functional groups are present in aspirin (acetylsalicylic acid)? A. Hydroxyl, ester and phenyl B. Carboxyl, ester and phenyl C. Carboxyl, amido and phenyl D. Carboxyl, alkoxy and hydroxyl
- Materiał graficzny
Zadanie 25
Which compounds are members of the same homologous series? A. Methanol, methanal, methanoic acid B. Ethane, ethene, ethyne C. Butan-1-ol, butan-2-ol, 2-methylpropan-2-ol D. Methanal, ethanal, propanal
Zadanie 26
Which procedure is best for converting butan-1-ol into butanoic acid? A. Heat under reflux with an acidified oxidizing agent B. Heat under reflux with a reducing agent C. Heat with an acidified oxidizing agent and distil off the product as it forms D. Heat…
Zadanie 27
What is the main organic product when 1-bromopropane is heated with aqueous sodium hydroxide solution? A. propene B. propan-1-ol C. propanal D. propane
Zadanie 28
A student determines the molar volume of a gas at STP in an experiment and obtains 21.2 dm3 mol−1. The value in the data booklet is 22.7 dm3 mol−1. What is the percentage error of the student's result? A. 1.5 % B. 6.61 % C.…