SPM Chemistry 2019 (Q4)

Question

Question (4): Diagram 3 shows an experiment to determine the heat of displacement for the reaction between excess zinc powder with 100cm^3 of 0.25 mol dm^-3 copper(II) sulphate solution.

Rajah 3 menunjukkan suatu ekspermen untuk memntukan haba penyesaran bagi tindak balas antara serbuk zink berlebihan, denagn 100cm^3 larutan kuprum(II) sulfat 0.25 mol dm^-3.

 

(a) State the meaning of heat displacement.

Nyatakan maksub haba penyesaran.

 

(b) Why is the polystyrene cup used in the experiment? Mengapakah cawan polistirena digunakan dlam exsperimen itu?

 

(c) State one observation for the reaction.

Nyatakan satu pemerhatian bagi tindak balas tersebut.

 

(d) State the type of reaction based on temperature change. Nyatakan jenis tindak balas berdasarkan perubahan suhu.

 

(e)

(i) Write a chemical equation for the reaction.

Tulis persamaan kimia bagi tindak balas itu.

 

(ii) Calculate the value of heat of displacement for the reaction.

(Given the specific heat capacity of solution is 4.2 J g^-1 ^oC-1)

Hitung nilai haba penyesaran bagi tindak balas itu.

(Diberi muatan haba tentu bagi larutan ialah 4.2 J g^-1 ^oC-1)

 

(f) Why is the zinc powder added until in excess?

Mengapakah serbuk zink ditambah sehingga berlebihan?

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

Cher Questions Solution Bank Rumusan Jawapan SPM & IGCSE Questions Answers Solution

 

 

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