Free Printable BAB 3:TERMOKIMIA

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BAB 3:TERMOKIMIA

Total questions: 20

Worksheet time: 20mins

Name

Class

Date

Antara yang berikut, yang manakah benar tentang tindak balas eksotermik?

Which of the following is true of an exothermic reaction?

Bekas itu menjadi panas.

The container becomes hotter.

Suhu campuran tindak balas menurun.

The temperature of the mixture decreases.

Tenaga haba diserap dari persekitaran.

Heat energy is absorbed from the surroundings.

Tenaga haba ditukar kepada tenaga kinetik.

The heat energy is converted to kinetic energy.

Rajah 1 menunjukkan aras tenaga bagi tindak balas

A + B $→C$
Tenaga pengaktifan bagi tindak balas tersebut adalah

Diagram 1 shows the energy level for the reaction A + B → C . The activation energy for the reaction is

( x + y)

( y – x )

Rajah 2 adalah gambar rajah aras tenaga bagi penguraian kalsium karbonat.

Pernyataan manakah yang boleh dirumuskan daripada rajah 2?

Haba diserap dalam tindak balas tersebut

Tindak balas tersebut adalah eksotermik

Jumlah tenaga bagi bahan tindak balas dan hasil tindak balas adalah 570 kJ

Bahan tindak balas mempunyai lebih tenaga daripada hasil tindak balas

Rajah 3 ialah gambar rajah aras tenaga.

Antara yang berikut, yang manakah boleh disimpulkan daripada Rajah 3 ?

Diagram 3 is an energy level diagram .

Which of the following can be deduced from Diagram 3 ?.

Pembentukan 1 mol nitrogen dioksida menyerap tenaga sebanyak 33 kJ.

The formation of 1 mol of nitrogen dioxide absorbed 33 kJ of heat

66 kJ haba diserap oleh persekitaran

66 kJ of heat is absorbed by the environment

Lebih banyak pemecahan ikatan berbanding pembentukan ikatan

More bonds are broken than formed

Tenaga cahaya diserap sepanjang tindak balas

Light energy is absorbed during the reaction

Antara yang berikut, yang manakah tindak balas endotermik?

Which of the following is an endothermic reaction?

$HCl+NaOH\rightarrow NaCl+H2O$

$HCl+NaHCO3\rightarrow NaCl+CO2+H2O$

$NaCl+AgNO3\rightarrow AgCl+NaNO3$

$Zn+CuSO4\rightarrow ZnSO4+Cu$

Berikut adalah persamaan bagi tindakbalas antara ion Ag⁺ dan ion Cl^- .

Ag⁺ + Cl^- → AgCl ∆ H = - 65 kJmol^-1

Antara berikut yang manakah benar tentang persamaan diatas ?

The following equation shows the reaction between Ag⁺ and Cl^- ions.

Ag⁺ + Cl^- → AgCl ∆ H = - 65 kJmol^-1

Which of the following is true about the above equation ?

Tindakbalaas endotermik berlaku

Endothermic reaction occurs

Haba dibebaskan ke persekitaran

Heat is released to the surroundings

Suhu hasil tindakbalas berkurang

The temperature of the product decreases

65 kJ haba diserap apabila 1 mol argentum klorida terbentuk

65 kJ of heat absorbed when 1 mole of silver chloride is formed .

Haba peneutralan antara asid hidroklorik dan kalium hidroksida adalah lebih tinggi daripada haba peneutralan antara asid etanoik dan kalium hidroksida kerana?

The heat of neutralisation between hydrochloric acid and potassium hydroxide is higher than the heat of neutralisation between ethanoic acid and potassium hydroxide because

asid hidroklorik adalah asid mineral sementara asid etanoik adalah asid organik

hydrochloric acid is a mineral acid whereas ethanoic acid is an organic acid

tindak balas antara asid etanoik dan kalium hidroksida adalah tidak lengkap

the reaction between ethanoic acid and potassium hydroxide is incomplete

asid hidroklorik dan asid etanoik mempunyai nilai pH yang berlainan

hydrochloric acid and ethanoic acid have different pH values

tenaga diperlukan untuk mengion asid etanoik

energy is needed to ionise the ethanoic acid

Rajah 4 menunjukkan gambar rajah aras tenaga bagi tindak balas pemendakan kalsium karbonat.

Antara berikut manakah boleh disimpulkan daripada gambarajah aras tenaga itu?

I Tindak balas adalah eksotermik

II Tindak balas adalah endotermik

III Jumlah kandungan tenaga bahan tindak balas adalah lebih rendah daripada hasil tindak balas.

IV Suhu menurun di dalam tindak balas ini.

Diagram 4 shows the energy level diagram for the precipitation reaction of calcium carbonate.

Which of the following can be derived from the energy level diagram?

I The reaction is exothermic

II The reaction is endothermic

III The total energy content of the reactants is lower than that of the products.

IV Temperature decreases in this reaction.

I dan III sahaja

I and III only

II dan III sahaja

II and III only

II, III dan IV sahaja

II, III and IV only

I dan IV sahaja

I and IV only

Rajah 5 menunjukkan gambar rajah aras tenaga bagi tindak balas antara zink dan larutan kuprum(II) sulfat.

Apakah haba tindak balas antara A dan B?

Diagram 5 shows the energy level diagram that represents the reaction between A and B.

What is the heat of the reaction between A and B?

T₂

T₂ – T₁

T₃ - T₁

T₃ – T₂

10.

Berikut ialah suatu persamaan termokimia.

HCl + NaOH $\rightarrow$ NaCl + H2O ∆H = -57 kJ/mol

Hitung kuantiti haba yang dibebaskan apabila 200 $cm^3$ 2.0 mol $dm^{-3}$ asid hidroklorik ditambah kepada 300 $cm^3$ 2.0 mol $dm^{-3}$ larutan natrium hidroksida.

The following is a thermochemical equation.
HCl + NaOH

\rightarrow

NaCl + H2O ∆H = -57 kJ/mol

Calculate the quantity of heat energy released when 200

cm^3

2.0 mol

dm^{-3}

hydrochloric acid is added to 300

cm^3

2.0 mol

dm^{-3}

sodium hydroxide solution.

5.70 kJ

11.4 kJ

17.1 kJ

22.8 kJ

11.

25.0 cm³ asid hidroklorik dan 25.0 cm³ larutan natrium hidroksida telah dicampurkan di dalam satu cawan polistirena. Campuran ini dikacau. Suhu campuran bertambah dari 29^oC kepada 39^oC. Tentukan haba yang dibebaskan semasa eksperimen ini.

[Muatan haba tentu larutan = 4.2 J g^{-1 o}C ^-1

Anggap 1 cm ³ larutan sama dengan 1 g larutan ]

25.0cm³ of hydrochloric acid and 25.0cm³ of sodium hydroxide solution were mixed together in a polystyrene cup. The mixture was stirred. The temperature of the mixture increased from 29^oC to 39^oC. Determine the heat released during the experiment.

[Specific heat capacity of a solution = 4.2 J g^{-1 o}C ^-1

Assume that 1 cm ³ of a solution is equal to 1 g of the solution ]

1050J

2100J

6090J

8190J

12.

Persamaan ion termokimia berikut mewakili tindak balas antara serbuk magnesium dan larutan ferum(II) sulfat.

The thermochemical ionic equation below represents the reaction between magnesium powder and iron(II) sulphate solution.

Mg + $Fe^{2+}$ $\rightarrow$ $Mg^{2+}$ + Fe ∆H = -189 kJ $mol^{-1}$

Hitungkan kenaikan suhu campuran apabila serbuk magnesium yang berlebihan ditambah kepada 80

cm^3

0.4 mol

dm^{-3}

larutan ferum(II) sulfat.

Calculate the increase in temperature when excess magnesium powder is added into 80

cm^3

of 0.4 mol

dm^{-3}

iron(II) sulphate solution.
[ Muatan haba tentu larutan = 4.0 J

g^{-1}

0_C^{ }-1

ketumpatan larutan = 1 g

cm^{-3}

]

6.5 oC

13.5 oC

18.9 oC

37.8 oC

13.

Jadual 1 menunjukkan haba pembakaran bagi tiga alkohol.

Antara faktor berikut , yang manakah menambahkan haba pembakaran alkohol ?

Table 1 shows the heat of combustion of three alcohols .

Which of the following factors increases the heat of cobustion of alcohols ?

Saiz molekul berkurang

Size of molecules decreases

Bilangan atom karbon per molekul bertambah

Number of carbon atoms per molecule increases

Bilangan atom oksigen per molekul bertambah

Number of oxygen atoms per molecule increases

Bilangan atom hidrogen per molekul berkurang

Number of hydrogen atoms per molecule decreases

14.

Rajah 6 menunjukkan gambarajah aras tenaga untuk tindakbalas antara asidhidroklorik dan kalium hidroksida .

Hitungkan jumlah haba yang dibebaskan apabila 50 cm³ asid hidroklorik 2 mol dm^-3 bertindak balas dengan 50 cm³larutan kalium hidroksida 2 mol dm^-3

Diagram 6 shows energy level diagrams for the reaction between hydrochloric acid and potassium hydroxide .

Calculate the amount of heat released when 50 cm³ of 2 mol dm^-3 hydrochloric acid reacts with 50 cm³of 2 mol dm^-3 potassium hydroxide solution.

5.40 kJ

10.8 kJ

27.0 kJ

54.0 kJ

15.

Persamaan berikut menunjukkan pembakaran heptana, C₇H₁₆dalam oksigen berlebihan.

C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O Δ H = - 5512 kJ mol^-

Dalam satu eksperimen pembakaran heptana dalam oksigen berlebihan membebaskan1378 kJ tenaga.

Berapakah jisim heptana yang digunakan?

[Jisim atom relatif: H = 1 ; C = 12 ]

The following equation shows the combustion of heptane, C₇H₁₆ in excess oxygen.

C₇H₁₆ + 11O₂ → 7CO₂ + 8H₂O Δ H = - 5512 kJ mol^-

In an experiment the combustion of heptane in excess oxygen releases 1378 kJ energy.

What is the mass of heptane used?

[Relative atomic mass : H = 1; C = 12]

25.0 g

36.0 g

77.0 g

88.0 g

16.

Antara berikut yang manakah adalah proses endotermik?

Which of the following is an endothermic process ?

Pembakaran etanol

The combustion of ethanol

Tindak balas antara larutan natrium hidroxida dan asid hidroklorik

Reaction between sodium hydroxide solution and hydrochloric acid

Tindak balas penyesaran antara magnesium dengan larutan kuprum(II) sulfat.

Displacement reaction between magnesium and copper(II) sulphate solution

Melarutkan pepejal ammonium sulfat dalam air

Dissolving solid ammonium sulphate in water

17.

Rajah 7 menunjukkan gambar rajah aras tenaga bagi tindak balas berikut:
W + X $\rightarrow$ Y + Z

Apakah nilai tenaga pengaktifan?

Diagram 7 shows the energy profile diagram for the following reaction:
W + X

\rightarrow

Y + Z
What is the value of the activation energy?

15kJ

55kJ

95kJ

150kJ

18.

Rajah 8 menunjukkan gambarajah aras tenaga bagi tindak balas antara ion argentum dan ion klorida

Manakah antara berikut adalah benar tentang tindak balas tersebut?

Diagram 8 shows the energy level diagram for the reaction between silver ions and chloride ions.

Which of the following statements is true about this reaction?

Tindak balas endotermik berlaku

Endothermic reaction occurs

Kandungan tenaga hasil tindak balas lebih tinggi daripada bahan tindak balas

The energy content of the product is higher than the reactants

65.5 kJ haba diserap apabila 1 mol argentum klorida terbentuk

65 kJ of heat is absorbed when 1 mol of silver chloride is formed

Suhu akhir pada akhir tindak balas lebih tinggi daripada suhu awal.

The final temperature at the end of the reaction is higher than the initial temperature

19.

Rajah 9 menunjukkan susunan radas untuk menentukan haba tindak balas

Diagram 9 shows the setup of apparatus for the determination of heat of reaction.

Berdasarkan Rajah 9 pernyataan berikut yang manakah benar?

Based on diagram 9, which of the following statement is true?

I Proses pembentukan ikatan berlaku

Process of bond formation occurs.

II Suhu meningkat semasa tindak balas berlaku

The temperature increases during the reaction.

III Nilai ΔH dalam tindak balas ini adalah positif

The value of H for the reaction is positive.

IV Kandungan tenaga hasil tindak balas lebih rendah

daripada kandungan tenaga bahan tindak balas

The energy content of the products is lower than the energy content of the reactants.

I dan II sahaja

I and II only

III dan IV sahaja

III and IV only

I, II dan IV sahaja

I, II and IV only

I, II, III dan IV

I,II ,III and IV

20.

Diagram 10 shows the energy level diagram of the following chemical reaction.

Rajah 10 menunjukkan gambar rajah aras tenaga bagi tindak balas kimia berikut.

X + Y R + S

Which of the following statements is true?

Antara pernyataan-pernyataan berikut, yang manakah benar?

Haba tindak balas bagi tindak balas ialah 70 kJ.

The heat of reaction is 70 kJ

R dan S adalah lebih stabil daripada P dan Q.

R and S are more stable than P and Q.

Tenaga pengaktifan bagi tindak balas adalah 200 kJ.

The activation energy is 200 kJ.

Haba terbebas apabila P bertindak balas dengan Q untuk menghasilkan R dan S.

Heat is released when P reacts with Q to produce R and S.

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BAB 3:TERMOKIMIA

Total questions: 20

Worksheet time: 20mins

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