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?

Which of the following reactions absorbed heat from the surrounding?

The combustion of methane in excess oxygen produces carbon dioxide and water. Bond Breaking and bond formation occurs during the combustion.

Which of the following occurs with absorption of energy during this combustion process?

The thermochemical equation represents the displacement of iron.

Persamaan termokimia mewakili tindak balas penyesaran ferum.

Mg_(s) + Fe²⁺ _(aq) → Mg²⁺ _(aq) + Fe_(s) ∆H = -189 kJ mol

Which of the following statements are true?

Manakah antara berikut benar?

I Magnesium is oxidized

Magnesium dioksidakan

II Reaction is exothermic

Tindak balas adalah eksotermik

III The temperature decreases

Suhu berkurangan

IV The heat released by reacting 0.2 mole of ferum(II) ions is 37.8 kJ

Haba yang dibebaskan semasa 0.2 mol ion ferum(II) bertindak balas ialah 37.8 kJ mol ^-1.

Which of the following is true about endothermic reaction?

Antara berikut manakah benar tentang tindak balas endotermik?

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?

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?

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

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 o}C^-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 o}C^-1. Jisim molar propanol = 60 g mol^-1]

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 o}C^-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 o}C^-1. Jisim molar propanol = 60 g mol^-1]

The following thermochemical equation represents the displacement of silver by zinc..
Persamaan termokimia berikut mewakili penyesaran argentum oleh zink.

Zn + 2 AgNO3   $\rightarrow$      Zn(NO3)2 +  2 Ag          ∆H = -360 kJ 

What is the mass of zinc required to release 60.0 kJ of heat?
[ Relative atomic mass: Zn= 65]
Apakah jisim zink yang diperlukan untuk membebaskan 60.0 kJ haba?
[Jisim atom relatif: Zn= 65]