SIMAK UI · Natural Sciences (Kemampuan IPA)

Chemistry: Stoichiometry, Equilibrium, Kinetics and Bonding

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

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What is the pH of a buffer solution prepared by mixing 100 mL of 0,2 M ethanoic acid (acetic acid, $K_{a} = 1, 8 \times 1 0^{- 5}$ ) with 100 mL of 0,2 M sodium ethanoate? (Take…
For the exothermic gas-phase reaction $2 SO_{2} (g) + O_{2} (g) ⇌ 2 SO_{3} (g)$ with $Δ H < 0$ , which set of condition changes will shift equilibrium toward products?
How many moles of electrons are transferred when 1 mole of permanganate ion ( $MnO_{4}^{-}$ ) is completely reduced to manganese(II) ion ( $Mn^{2 +}$ ) in an acidic aqueous medium?
What is the molecular geometry and hybridization of the central sulfur atom in sulfur hexafluoride ( $SF_{6}$ )?
A reaction $A \to Products$ follows second-order kinetics with rate constant $k = 0, 05 M^{- 1} s^{- 1}$ . If initial concentration $[A]_{0} = 0, 40 M$ , what is…
What is the standard cell potential ( $E_{cell}^{\circ}$ ) for a galvanic cell consisting of standard $Zn^{2 +} / Zn$ ( $E^{\circ} = - 0, 76 V$ ) and $Cu^{2 +} / Cu$ (…
Calculate the mass of calcium carbonate ( $CaCO_{3}$ , molar mass $= 100 g/mol$ ) required to react completely with 250 mL of $0, 4 M$ hydrochloric acid.
Which of the following molecules has a permanent net dipole moment (polar molecule)?
The solubility product constant $K_{s p}$ of silver chloride ( $AgCl$ ) is $1, 8 \times 1 0^{- 10}$ at 25°C. What is its molar solubility in pure water?
What is the major organic product formed when propene ( $CH_{3} CH = CH_{2}$ ) reacts with hydrogen bromide ( $HBr$ ) in the absence of peroxides?
What volume of dry hydrogen gas at STP is liberated when 4,6 g of metallic sodium reacts completely with excess water? ( $A_{r} Na = 23$ )
Which quantum number specifies the spatial orientation of an atomic orbital in space?
A solution contains $18 g$ of glucose ( $C_{6} H_{12} O_{6}$ , molar mass $= 180 g/mol$ ) dissolved in $500 g$ of water. If the boiling point elevation constant $K_{b}$ …
Which functional group is formed by the oxidation of a secondary alcohol using potassium dichromate ( $K_{2} Cr_{2} O_{7}$ ) in acidic solution?
What is the formal charge on the central nitrogen atom in the nitrate ion ( $NO_{3}^{-}$ )?
For the combustion of methane: $CH_{4} (g) + 2 O_{2} (g) \to CO_{2} (g) + 2 H_{2} O (l)$ , given standard enthalpies of formation $Δ H_{f}^{\circ} [CH_{4}] = - 75 kJ/mol$ …
Which of the following aqueous salt solutions is basic (pH > 7) due to hydrolysis?
What is the bond order of the diatomic oxygen molecule ( $O_{2}$ ) according to Molecular Orbital (MO) theory?
During the electrolysis of aqueous copper(II) sulfate ( $CuSO_{4}$ ) using inert platinum electrodes, what reaction occurs at the anode?
Which pair of compounds represents functional group isomers?
What is the oxidation state of chromium in potassium dichromate ( $K_{2} Cr_{2} O_{7}$ )?
Which type of intermolecular attractive force is responsible for the anomalously high boiling point of water compared to hydrogen sulfide ( $H_{2} S$ )?
A first-order reaction has a rate constant $k = 6, 93 \times 1 0^{- 3} s^{- 1}$ . How many seconds does it take for the reactant concentration to decrease to 25% of its initial value? (Take…
What is the conjugate acid of the hydrogen phosphate ion ( $HPO_{4}^{2 -}$ )?
Which of the following elements has the greatest first ionization energy?

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Chemistry: Stoichiometry, Equilibrium, Kinetics and Bonding

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