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Dodaj cały arkusz do zestawuWhat happens as a pure molecular solid, such as solid ammonia, melts at its melting point? I. The temperature of the sample stays constant. II. The energy absorbed is used to partly overcome the forces between the particles. III. Covalent bonds within the…
What is the molecular formula of the compound with empirical formula CH2 and the following mass spectrum? A. C4H8 B. C6H12 C. C7H14 D. C8H16
Which species are present after 14 dm3 of ethyne has reacted with 20 dm3 of hydrogen to produce ethane? All gas volumes are measured at the same temperature and pressure. C2H2(g) + 2 H2(g) → C2H6(g) A. 14 dm3 of…
Which electron transition produces the line of longest wavelength in the visible region of the hydrogen line emission spectrum? A. Transition A B. Transition B C. Transition C D. Transition D
Which of the following can be used to deduce the number of valence electrons in an atom of a main group element? I. The first ionization energy of the element. II. The electron configuration of the element. III. The successive ionization energies of the…
Which element is in the f-block of the periodic table? A. U B. Ba C. Hf D. Rf
Equal amounts of each of the following oxides are added to separate samples of water of the same volume. Which oxide gives the solution with the lowest pH? A. CO B. SO3 C. K2O D. CO2
What is the oxidation state of platinum in the complex ion [PtCl5(NH3)]−? A. +1 B. +2 C. +3 D. +4
Which type of substance has these properties? - very high melting point - does not conduct electricity as a solid or when molten - insoluble in water A. ionic B. metallic C. giant covalent D. simple molecular
Resonance structures can be drawn for which of the following species? I. CO32− II. NH4+ III. C6H6 A. I and II only B. I and III only C. II and III only D. I, II and III
Which combination best describes SO32−? A. 4 electron domains around S, trigonal pyramidal, 107° B. 3 electron domains around S, trigonal planar, 120° C. 4 electron domains around S, tetrahedral, 109.5° D. 3 electron domains around…
What is the molecular geometry of XeF4? A. tetrahedral B. see-saw C. octahedral D. square planar
A 52.0 g piece of zinc at 90.0 °C is dropped into 80.0 cm3 of water at 20.0 °C. The final temperature of the water is 24.0 °C. The specific heat capacity of zinc is…
Which expression can be used to calculate the standard enthalpy change of a reaction, ΔH⊖, from standard enthalpies of combustion? A.…
Which change represents the first electron affinity of chlorine? A. Cl2(g) → 2 Cl(g) B. Cl(g) + e− → Cl−(g) C. Cl(g) → Cl+(g) + e− D. Cl−(g) → Cl(g) + e−
Which change results in the greatest decrease in entropy? A. CaCO3(s) → CaO(s) + CO2(g) B. NaNO3(s) → Na+(aq) + NO3−(aq) C. H2O(l) → H2O(g) D. N2(g) + 3 H2(g) → 2 NH3(g)
Which methods could be used to determine the rate of this reaction? CaCO3(s) + 2 HCl(aq) → CaCl2(aq) + H2O(l) + CO2(g) I. measuring the decrease in mass of the reaction mixture II. measuring the change in absorbance of light by the solution in a…
The reaction between nitrogen monoxide and chlorine gives the following rate data at a certain temperature. 2 NO(g) + Cl2(g) → 2 NOCl(g) What is the overall order of the reaction? A. 0 B. 1 C. 2 D. 3
Which statement is correct for the Arrhenius equation? A. As the temperature increases, the value of increases. B. At a given temperature, k increases as Ea increases. C. A is the minimum…
The equilibrium constant for the reaction below is Kc = 280 at 700 K. 2 SO2(g) + O2(g) ⇌ 2 SO3(g) What is the value of the equilibrium constant at 700 K for the following reaction? 6 SO3(g) ⇌ 6 SO2(g) + 3 O2(g) A. B.…
The equilibrium constant for the reaction below is Kc = 4.5 × 10−31 at 298 K. Which combination is correct? N2(g) + O2(g) ⇌ 2 NO(g) A. products are favoured and ΔG is positive B. products are favoured and ΔG is negative C.…
Which two species form a conjugate acid-base pair in this reaction? HCOOH(aq) + NH3(aq) ⇌ HCOO−(aq) + NH4+(aq) A. HCOOH and HCOO− B. HCOOH and NH3 C. NH3 and HCOO− D. HCOOH and NH4+
Which method can be used to distinguish between nitric acid, HNO3(aq), and ethanoic acid, CH3COOH(aq), of equal concentration? A. measuring the volume of sodium hydroxide solution of known concentration needed to neutralize 20.0 cm3…
At 298 K the pKa of methanoic acid is 3.75 and the pKa of ethanoic acid is 4.76. Which statement is correct for solutions of these acids with the same concentration? A. Ethanoic acid is a stronger acid than methanoic…
Which combination would produce a buffer solution? A. 50 cm3 of 1.0 mol dm−3 NH3(aq) and 50 cm3 of 1.0 mol dm−3 HCl(aq) B. 25 cm3 of 1.0 mol dm−3…
In which pair of species does nitrogen have the same oxidation state? A. HNO2 and N2O3 B. NO3− and N2O4 C. NH4+ and N2H4 D. NO and N2O
Which statement is correct for a voltaic cell made from a zinc half-cell and a copper half-cell? The standard electrode potential of the zinc half-cell is more negative than that of the copper half-cell. A. Zinc is the cathode. B. Electrons flow through the…
What are the products of the electrolysis of dilute aqueous copper(II) sulfate, CuSO4(aq), using inert electrodes? A. hydrogen gas and oxygen gas B. copper metal and oxygen gas C. hydrogen gas and sulfur dioxide gas D. copper metal and sulfur dioxide…
Which compounds belong to the same homologous series? A. CH3CH2COOH, CH3COOH, CH3CH2CH2COOH B. CH3COCH3, CH3CH2CHO, CH3CH2COCH3 C. CH3CH2OH, CH3CHO, CH3COOH D. CH3CH2Cl, CH2=CHCl,…
What is the name of this compound? BrCH2CH2CH(CH3)CH2CH3 A. 1-bromo-3-ethylbutane B. 5-bromo-3-methylpentane C. 1-bromo-3-methylpentane D. 1-bromo-2-ethylbutane
Which compound is the organic product when CH3CH2COOH and CH3CH2CH(OH)CH3 are heated together in the presence of concentrated sulfuric acid? A. CH3CH2COCH(CH3)CH2CH3 B. CH3CH2CH(CH3)COOCH2CH3 C. CH3CH2COOCH(CH3)CH2CH3 D.…
Which reaction would be the fastest under the same conditions? A. CH3CH2CH(Cl)CH3 + OH− B. CH3CH2C(CH3)2Cl + OH− C. CH3CH2CH(I)CH3 + OH− D. CH3CH2C(CH3)2I + OH−
A 25.0 cm3 sample of ethanol weighed 19.725 g at 20 °C. What is the density of ethanol in g cm−3? A. 0.79 B. 0.789 C. 0.7890 D. 0.78900
A signal in the 1H NMR spectrum of an organic compound is a triplet. What does the splitting of this signal show? A. There are three hydrogen atoms in the chemical environment that gives the signal. B. There are three different chemical environments for…