Zadanie 12
In which compound is the electrostatic attraction between the ions weakest? A. MgO B. CaO C. CaS D. MgS
Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.
Baza zadań
Wybierz umiejętność, rok lub poziom trudności. Każde zadanie ma klucz i schemat punktowania.
Pokazujemy tylko poziomy, dla których mamy zadania.
Znaleziono 1061 zadań
In which compound is the electrostatic attraction between the ions weakest? A. MgO B. CaO C. CaS D. MgS
What is the IUPAC name of the compound shown? A. 3-methylhexan-4-one B. 4-methylhexan-3-one C. 4-ethylpentan-3-one D. 2-ethylpentan-3-one
Which oxide reacts with water to give a solution with a pH greater than 7? A. SO2 B. P4O10 C. Al2O3 D. Na2O
The first ionization energies of four elements with consecutive atomic numbers, A, B, C and D, are shown. An element X reacts with oxygen to form an acidic oxide. Which element could be X? A. A B. B C. C D. D
Which of these alkanes boils at the lowest temperature? A. CH3CH2CH2CH2CH3 B. C(CH3)4 C. (CH3)2CHCH2CH3 D. CH3CH2CH2CH2CH2CH3
Which formula represents an amide? A. CH3CH2NH2 B. CH3CH2CONH2 C. (C2H5)2NH D. H2NCH2CH2COOH
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
The potential energy profile of a reaction is shown. Which reaction has this energy profile? A. Cl2(g) → 2 Cl(g) B. CaCO3(s) → CaO(s) + CO2(g) C. N2O4(g) → 2 NO2(g) D. 2 Mg(s) + O2(g) → 2 MgO(s)
The standard enthalpy changes of two reactions are given below. N2(g) + O2(g) → 2 NO(g) ΔH⊖ = x kJ mol−1 2 NO(g) + O2(g) → 2 NO2(g) ΔH⊖ = y kJ mol−1 What is ΔH⊖, in…
What is ΔH, in kJ, in the energy cycle below? A. +20 - 165 B. +20 + 165 C. -20 + 165 D. -20 - 165