Zadanie 8c
Two colourless liquids in unlabelled bottles are cyclohexane and cyclohexene. Describe a chemical test, and the expected observation with each liquid, that would show which bottle contains cyclohexene.
Wczytuję zadania…
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Wybierz umiejętność, rok lub poziom trudności.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1476 zadań
Two colourless liquids in unlabelled bottles are cyclohexane and cyclohexene. Describe a chemical test, and the expected observation with each liquid, that would show which bottle contains cyclohexene.
(i) Write the equation for the reaction between hex-3-ene and hydrogen bromide. (ii) State the type of reaction in (i). (iii) Suggest two differences between the NMR spectra of hex-3-ene and of the organic product in (i). Use section 21 of the data…
(i) Explain the mechanism of the reaction between 1-chloropropane, CH3CH2CH2Cl, and aqueous potassium hydroxide, KOH(aq), using curly arrows to represent the movement of electron pairs. (ii) Deduce the splitting pattern, in the NMR…
Ethane reacts with iodine vapour. C2H6(g) + I2(g) → C2H5I(g) + HI(g) (i) Calculate the enthalpy change of the reaction, ΔH, using section 12 of the data booklet. (ii) Draw and label an enthalpy level diagram for this reaction on the axes below.
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
Which compound has bonding that is best described as predominantly ionic? Use sections 9 and 17 of the data booklet. A. NO2 B. ICl C. BaO D. SiH4
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…
What is the main attraction between molecules in liquid carbon tetrachloride, CCl4? A. Hydrogen bonding B. Ionic attraction C. Dipole–dipole forces D. London (dispersion) forces
For which species can resonance structures be drawn? A. CH3CH2OH B. CH3CH2O− C. CH3NH3+ D. CH3COO−
What is the formal charge of the boron atom in the tetrafluoroborate ion, BF4−, in which boron is bonded to each of four fluorine atoms by a single bond? A. −3 B. −1 C. 0 D. +1