WorksheetsTERMOKIMIA 2
Total questions: 9
Worksheet time: 5mins
Diagram 15 shows the set-up of apparatus to determine heat of combustion of ethanol.
Rajah 15 menunjukkan susunan radas untuk menentukan haba pembakaran etanol.
DIAGRAM 15
The heat of combustion of ethanol was found less than the theoretical value. What can be done to improve the experimental value?
Haba pembakaran etanol didapati kurang dari nilai teori. Apa yang perlu dilakukan untuk memperbaiki nilai eksperimen tersebut?
I Remove the wooden block
Keluarkan blok kayu
II Use copper container to replace beaker
Gunakan bekas kuprum menggantikan bikar
III Do not use wire gauze when heating
Tidak menggunakan kasa dawai semasa pemanasan
IV Use greater volume of water
Menggunakan isipadu air yang lebih besar
A II and III only
B I, II and III only
C II, III and IV only
D I, II, III and IV
Diagram above shows the energy level diagram for the reaction between P and Q
Rajah 7 menunjukkan rajah aras tenaga bagi proses peneutralan.
(refer diagram at Media)
What is the value of x?
A +270
B +200
C -130
D +130
Which of the following reactions absorbed heat from the surrounding?
A. Dilute sulphuric acid is added to sodium hydroxide solution
B. Solid ammonium nitrate is dissolved in water
C. Zinc powder is added to copper(II)suplhate solution
D. A piece of potassium is added to water
Which of the following is true about endothermic reaction?
Antara berikut manakah benar tentang tindak balas endotermik?
A The heat of reaction has negative value
Haba tindak balas bernilai negatif
B Heat is absorbed from the surrounding
Haba diserap dari sekeliling
C The reaction shows an increase in temperature
Tindak balas menunjukkan peningkatan suhu
D The energy of the reactants is higher than the products
Tenaga bahan tindak balas tinggi daripada hasil tindak balas
Diagram 7 represents an energy profile diagram representing an endothermic reaction.
Rajah 7 menunjukkan gambar rajah profil tenaga yang mewakili tindak balas endotermik.
What is the value of activation energy?
Apakah nilai tenaga pengaktifan?
A x kJ
B y kJ
C z kJ
D (x - y) kJ
Diagram 7 represents an energy profile diagram representing an endothermic reaction.
Rajah 7 menunjukkan gambar rajah profil tenaga yang mewakili tindak balas endotermik.
What is the value of activation energy?
Apakah nilai tenaga pengaktifan?
A x kJ
B y kJ
C z kJ
D (x - y) kJ
The following thermochemical equation shows the formation of lead (II) sulphate.
Persamaan termokimia berikut menunjukkan pembentukan plumbum (II) sulfat.
(REFER DIAGRAM GIVEN)
Which of the following statements is true regarding the reaction?
Antara penyataan berikut manakah benar mengenai tindak balas tersebut?
I White precipitate is formed
Mendakan putih terbentuk
II Reaction is exothermic
Tindak balas adalah eksotermik
III Temperature decreases during the reaction
Suhu berkurangan semasa tindak balas
IV The heat released when 0.2 mole of lead(II) ions react is 10.0 kJ
Haba yang terbebas apabila 0.2 mol ion plumbum(II) bertindak balas ialah 10.0 kJ
A I and III
B II and IV
C I, II and IV
D II, III and IV
The heat of combustion for propanol, C3H7OH is – 2016 kJ mol-1. When 0.3 g of propanol is completely burnt, the heat given out is used to heat 250 cm3 of water. What is the rise in temperature for the water?
[Specific heat capacity of water = 4.2 J g-1 oC-1. Molar mass of propanol = 60 g mol-1]
Haba pembakaran propanol, C3H7OH adalah - 2016 kJ mol-1. Apabila 0.3 g propanol terbakar lengkap, haba yang dibebaskan digunakan untuk memanaskan 250 cm3 air.
Apakah kenaikan suhu air?
[Muatan haba tentu air = 4.2 J g-1 oC-1. Jisim molar propanol = 60 g mol-1]
A 2.4oC
B 4.8oC
C 9.6oC
D 19.2oC
The heat of combustion for propanol, C3H7OH is – 2016 kJ mol-1. When 0.3 g of propanol is completely burnt, the heat given out is used to heat 250 cm3 of water. What is the rise in temperature for the water?
[Specific heat capacity of water = 4.2 J g-1 oC-1. Molar mass of propanol = 60 g mol-1]
Haba pembakaran propanol, C3H7OH adalah - 2016 kJ mol-1. Apabila 0.3 g propanol terbakar lengkap, haba yang dibebaskan digunakan untuk memanaskan 250 cm3 air.
Apakah kenaikan suhu air?
[Muatan haba tentu air = 4.2 J g-1 oC-1. Jisim molar propanol = 60 g mol-1]
A 2.4oC
B 4.8oC
C 9.6oC
D 19.2oC
