Tawjihi (General Secondary) · Physics and Chemistry

Chemical Equilibrium, Thermodynamics and Organic Chemistry

46 practice questions, each with the answer and an explanation.

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What is the pH of a $0.001 M$ aqueous solution of strong hydrochloric acid ( $HCl$ ) at $2 5^{\circ} C$ ?
According to Le Chatelier's Principle, which perturbation will shift the equilibrium position of the exothermic Haber reaction…
What is the IUPAC systematic name for the organic compound with molecular structure $CH_{3} - CH_{2} - CO - CH_{3}$ ?
In a galvanic cell with standard hydrogen electrode (SHE, $E^{\circ} = 0.00 V$ ) and copper electrode ( $Cu^{2 +} + 2 e^{-} \to Cu$ , $E^{\circ} = + 0.34 V$ ), what is the sta…
What is the oxidation state of sulfur in the sulfate polyatomic ion $SO_{4}^{2 -}$ ?
Which of the following elements has the highest first ionization energy?
What is the molecular geometry of sulfur hexafluoride ( $SF_{6}$ ) according to VSEPR theory?
What volume of $0.50 M NaOH$ solution is required to neutralize completely $25.0 mL$ of $0.20 M H_{2} SO_{4}$ solution?
For a first-order chemical reaction, the rate constant $k$ is $0.0693 min^{- 1}$ . What is the half-life $t_{1/2}$ of the reaction?
Which of the following organic functional groups reacts with sodium bicarbonate ( $NaHCO_{3}$ ) solution with effervescence due to carbon dioxide evolution?
Calculate the standard enthalpy of reaction $Δ H_{rxn}^{\circ}$ for $CH_{4} (g) + 2 O_{2} (g) \to CO_{2} (g) + 2 H_{2} O (l)$ , given standard formation enthalpies…
What type of intermolecular force is predominantly responsible for the unusually high boiling point of water relative to other group 16 hydrides (such as $H_{2} S$ )?
Which of the following organic compounds will yield a silver mirror precipitate upon heating with Tollens' reagent (ammoniacal silver nitrate)?
A buffer solution contains $0.20 M$ acetic acid ( $CH_{3} COOH$ , $K_{a} = 1.8 \times 1 0^{- 5}$ , $p K_{a} = 4.74$ ) and $0.20 M$ sodium acetate ( $CH_{3} COONa$ ). Wh…
Which of the following representative elements requires the greatest energy to remove its first valence electron?
At a certain temperature $K_{c} = 36$ for $H_{2} (g) + I_{2} (g) ⇌ 2 HI (g)$ . If $1.0 mol$ of $H_{2}$ and $1.0 mol$ of $I_{2}$ are placed in a sea…
$50 mL$ of $0.10 M$ $HCl$ is mixed with $100 mL$ of $0.10 M$ $NaOH$ at $2 5^{\circ} C$ . Given $lo g 3 = 0.48$ , what is the pH of the final solution?
How many neutrons are in $_{3}^{7} L i^{+}$ ?
What is the oxidation number of N in NH₃?
What volume does 0.5 mol of any gas occupy at STP? (Molar volume 22.4 L/mol)
A compound contains 24 g carbon, 8 g hydrogen and 32 g oxygen. What is its empirical formula? (C = 12, H = 1, O = 16)
For $A + B ⇌ 2 C$ the equilibrium concentrations are $[A] = 2$ , $[B] = 1$ and $[C] = 6$ mol/L. What is $K_{c}$ ?
What is the oxidation number of Cr in K₂Cr₂O₇?
50 mL of 2 mol/L HCl is neutralised by 0.2 mol/L NaOH. What volume of NaOH is needed?
10 mL of a 12 mol/L solution is diluted to 2 mol/L. What is the final volume?
What is the mass of 5 mol of CuSO₄? (Relative atomic masses: Cu = 63.5, S = 32, O = 16.)
What is the oxidation number of N in NO₂?
25 mL of a 12 mol/L solution is diluted to 0.1 mol/L. What is the final volume?
What is the mass of 2 mol of HCl? (Relative atomic masses: H = 1, Cl = 35.5.)
What volume does 0.25 mol of any gas occupy at STP? (Molar volume 22.4 L/mol)
At 25 °C a solution has pH 2. What is its pOH?
What is the mass of 0.1 mol of CuSO₄? (Relative atomic masses: Cu = 63.5, S = 32, O = 16.)
Heating $C a C O_{3}$ gives $C a O + C O_{2}$ . What volume of $C O_{2}$ at STP comes from 40 g of $C a C O_{3}$ ? (Ca = 40, C = 12, O = 16; molar volume 22.4 L/mol)
How many neutrons are in $_{19}^{39} K^{+}$ ?
What is the pH of a strong acid with $[H^{+}] = 1 \times 1 0^{- 2}$ mol/L?
What is the oxidation number of Cu in CuO?
A reaction should give 50 g of product but gives 30 g. What is the percentage yield?
How many molecules are in 5 mol of NH₃? (Avogadro constant $6.02 \times 1 0^{23}$ per mol)
An atom has atomic number 11. How many electrons are in its outer shell?
How many moles are there in 9 g of H₂O? (Relative atomic masses: H = 1, O = 16.)
What is the pH of a strong acid with $[H^{+}] = 1 \times 1 0^{- 6}$ mol/L?
50 mL of a 2 mol/L solution is diluted to 0.1 mol/L. What is the final volume?
A reaction should give 100 g of product but gives 25 g. What is the percentage yield?
Heating $C a C O_{3}$ gives $C a O + C O_{2}$ . What volume of $C O_{2}$ at STP comes from 50 g of $C a C O_{3}$ ? (Ca = 40, C = 12, O = 16; molar volume 22.4 L/mol)
What is the oxidation number of S in H₂S?
What is the oxidation number of Mn in MnO₂?

Chemical Equilibrium, Thermodynamics and Organic Chemistry

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