Zadanie 15
Wzorowane na: Chemistry SL Paper 1, May 2024, TZ2, pytanie 15. Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.
Darmowe konto pozwoli wrócić do niego później.
Polecenie
Which statement about the energy changes in a reaction between covalent molecules is correct?
A. The enthalpy change of the reaction equals the sum of the bond enthalpies of the bonds broken minus the sum of the bond enthalpies of the bonds formed
B. The reaction is exothermic if the bonds in the reactants are stronger than the bonds in the products
C. Breaking the bonds in the reactants releases energy to the surroundings
D. The activation energy equals the energy released when the bonds in the products form
Sprawdź rozwiązanieUkryj rozwiązanieKlucz i punktacja
Odpowiedź z klucza
A ✔
«energy is absorbed to break bonds in the reactants and released when bonds form in the products, so »
«a reaction is exothermic when the products have stronger bonds than the reactants; breaking bonds absorbs energy; the activation energy is the minimum energy needed for a successful collision»
Schemat punktowania
One mark for the correct option.