Wazari Exam (Iraq Baccalaureate) - Scientific Branch · Chemistry

Equilibrium, Acids, Electrochemistry and Organic Chemistry

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What is the pH of a 0.01 mol/L solution of hydrochloric acid?
What is the pH of a 0.001 mol/L solution of sodium hydroxide at 25 degrees C?
Which expression gives $K_{c}$ for $N_{2} (g) + 3 H_{2} (g) ⇌ 2 N H_{3} (g)$ ?
The equilibrium $A + B ⇌ C$ is exothermic in the forward direction. What happens when the temperature is raised?
How many moles are in 11 g of carbon dioxide ( $M = 44$ g/mol)?
4 g of sodium hydroxide ( $M = 40$ g/mol) is dissolved to make 500 mL of solution. What is the concentration?
1.0 mol each of A and B are placed in a 1.0 L vessel and react: $A + B ⇌ 2 C$ . At equilibrium 0.80 mol of C is present. What is $K_{c}$ ?
What is the standard cell potential of a Zn/Cu galvanic cell, given $E^{\circ} (Z n^{2 +} / Z n) = - 0.76$ V and $E^{\circ} (C u^{2 +} / C u) = + 0.34$ V?
What is the oxidation number of manganese in $K M n O_{4}$ ?
What charge is needed to deposit 0.1 mol of copper from $C u^{2 +}$ solution? ( $F = 96500$ C/mol)
Which functional group is present in an alcohol?
What is the IUPAC name of $C H_{3} C H (C H_{3}) C H_{2} C H_{3}$ ?
Ethanoic acid reacts with ethanol with an acid catalyst. What are the products?
What is observed when an alkene is shaken with bromine water?
A buffer is made from a weak acid with $p K_{a} = 4.76$ and its salt, with $[A^{-}] / [H A] = 10$ . What is its pH?
25.0 mL of sulfuric acid is neutralised by 20.0 mL of 0.100 mol/L sodium hydroxide. What is the sulfuric acid concentration?
What volume do 2.0 mol of an ideal gas occupy at 0 degrees C and 1 atm? (Molar volume 22.4 L)
What is the hybridisation of each carbon atom in ethene, $C_{2} H_{4}$ ?
Doubling the concentration of reactant A quadruples the rate of a reaction. What is the order with respect to A?
Given $C (s) + O_{2} \to C O_{2}$ with $Δ H = - 393.5$ kJ/mol and $C O + \frac{1}{2} O_{2} \to C O_{2}$ with $Δ H = - 283.0$ kJ/mol, find $Δ H$ for $C (s) + \frac{1}{2} O_{2} \to C O$ .
A 0.1 mol/L solution of a weak acid HA has $K_{a} = 1 \times 1 0^{- 5}$ . What is its pH?
The $K_{s p}$ of silver chloride is $1.8 \times 1 0^{- 10}$ . What is its molar solubility in pure water?
How does atomic radius change down a group of the periodic table?
What is the shape of an ammonia molecule, $N H_{3}$ ?
4 g of hydrogen reacts with 16 g of oxygen: $2 H_{2} + O_{2} \to 2 H_{2} O$ . What mass of water forms at most? ( $H = 1$ , $O = 16$ )
What forms at the cathode in the electrolysis of molten sodium chloride?
How many structural isomers does $C_{4} H_{10}$ have?
Which change causes the greatest increase in entropy?

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