Zacznij za darmoZacznij

Zadanie 2a, Paper 2, specimen 2025, Chemia IB SL

3 pktotwarteśrednie (szac.)Paper 2, specimen 2025

Wzorowane na: Chemistry SL Paper 2, specimen 2025, pytanie 2(a). Treść, dane i kontekst są zmienione; sprawdzane umiejętności, format i punktacja jak w oryginale.

Zapisz zadanie

Darmowe konto pozwoli wrócić do niego później.

Zadanie

Wspólne informacje do wiązki zadań

Scientific models of the structure of the atom have been developed and revised as new experimental evidence became available.

Polecenie

In the Geiger–Marsden experiment, α-particles (the nuclei of helium-4 atoms) were fired at a very thin foil of silver. A detector that could be moved around the foil recorded the angle of deflection, θ, of the particles. Two of the possible routes are shown: route A, straight through the foil, and route B, back towards the source.

schematic of the scattering experiment: a beam of alpha-particles hits a thin silver foil placed at the centre of a circular detector track; route A passes straight through the foil (θ = 0°), route B is deflected back towards the source at a large angle θPowiększ
schematic of the scattering experiment: a beam of alpha-particles hits a thin silver foil placed at the centre of a circular detector track; route A passes straight through the foil (θ = 0°), route B is deflected back towards the source at a large angle θ

The graph shows how the relative number of α-particles reaching the detector varies with the angle of deflection.

graph of the relative number of alpha-particles detected against the angle of deflection from −180° to +180°, with a very sharp peak at 0° labelled route A and only a tiny number at large angles labelled route BPowiększ
graph of the relative number of alpha-particles detected against the angle of deflection from −180° to +180°, with a very sharp peak at 0° labelled route A and only a tiny number at large angles labelled route B

(i) State the nuclear charges of silver and helium.

(ii) Explain why a very small number of α-particles follow route B and are deflected back towards the source.

(iii) The great majority of the α-particles follow route A and pass through the foil without being deflected (θ = 0°). Suggest what this observation indicates about the structure of the atom.

Korepetytor AI

Nie wiesz, jak ruszyć? Korepetytor zna to zadanie i poprowadzi Cię krok po kroku, bez gotowca.

Wypróbuj za darmo

3 rozmowy · bez karty · Zaloguj się

Sprawdź się

Odpowiedz i oceń, jak poszło. Klucz odsłoń dopiero, gdy masz swoją odpowiedź.

Zanim porównasz z kluczem

Jak poszło Ci z tym zadaniem?

Zaloguj się, żeby zapisać ocenę i wrócić do zadania później.

ŁatweŚrednieTrudne
Pokaż rozwiązanieUkryj rozwiązanieKlucz i punktacja

Odpowiedź z klucza

(i) silver: +47 AND helium: +2 ✔

(ii) «the positively charged α-particle is» repelled by the positively charged «silver» nucleus «when it passes very close to it» ✔

(iii) most of the volume of the atom is empty space

OR

the nucleus is very small «compared with the size of the atom» ✔

Schemat punktowania

One mark per sub-part. (i) both charges required, sign and magnitude; (ii) repulsion between like charges, the nucleus must be identified as positive; (iii) either the empty-space or the tiny-nucleus statement.

Umiejętności w zadaniu

Pliki cookies

Zapisujemy na Twoim urządzeniu to, bez czego serwis nie działa, np. zalogowanie. Plików analitycznych użyjemy tylko za Twoją zgodą. Szczegóły w polityce prywatności.