Chem intellect Week 1

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Chem intellect Week 1


Chem intellect Week 1Versión en línea Welcome back por Senpal088 1 Which statement best describes a catalyst in a chemical reaction? a It increases the rate by consuming reactants b It changes the overall enthalpy of the reaction c It lowers the activation energy without being consumed d It shifts the equilibrium to products only 2 Which is the most correct about pH at 25°C for pure water? a pH = 7.5 due to autoprotolysis b pH = 14 and [H3O+] = 1 M c pH = 7 and [H3O+] = 10^-7 M d pH = 0 and [H3O+] = 1 M 3 Which statement describes a buffer system correctly? a It has no effect on pH b It completely neutralizes added acid c It only works at high temperatures d It resists pH changes upon addition of small amounts of acid or base 4 Which orbital is filled last in a ground-state atom? a 5s b 4s c 3d d 4p 5 Which statement about a galvanic cell is true? a Its E° is negative for spontaneous processes b It requires external energy to run c Spontaneous redox reaction generates electrical work d Electrons move from cathode to anode 6 In a first-order reaction with rate constant k, what is t1/2? a t1/2 = k b t1/2 = 1/(2k) c t1/2 = k/ln(2) d t1/2 = ln(2)/k 7 Which gas law relates pressure and volume at constant temperature? a Avogadro's Law: n ∝ V b Graham's Law: rates ∝ sqrt(M) c Charles' Law: V ∝ T d Boyle's Law: P V = constant 8 What is the hybridization of the central atom in CH4? a sp b sp2 c sp3 d d2sp3 9 Which species acts as a Bronsted-Lowry acid? a H2O b HCl c NH3 d OH- 10 Which indicator changes color over the widest pH range? a Universal indicator b Bromothymol blue c Methyl orange d Phenolphthalein Feedback 1 A catalyst provides an alternative pathway with lower activation energy and is regenerated at the end. 2 Neutral water at 25°C has pH 7 with equal [H3O+] and [OH-] of 10^-7 M. 3 Buffers confer pH resistance by weak acid/base conjugates reacting with added H+ or OH-. 4 Aufbau order: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p... 5 Spontaneous overall ΔG < 0; electrons flow from anode to cathode, producing current. 6 First-order half-life is t1/2 = 0.693/k. 7 Boyle's law describes P and V at constant T for a fixed n. 8 Carbon forms four sigma bonds using four sp3 hybrids. 9 Bronsted-Lowry acids donate protons; HCl donates H+ in water. 10 Phenolphthalein changes ~pH 8.2–10, broad for basic range; universal has wide range but is a mixture.

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Chem intellect Week 1

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Chem intellect Week 1Versión en línea

por Senpal088

Which statement best describes a catalyst in a chemical reaction?

Which is the most correct about pH at 25°C for pure water?

Which statement describes a buffer system correctly?

Which orbital is filled last in a ground-state atom?

Which statement about a galvanic cell is true?

In a first-order reaction with rate constant k, what is t1/2?

Which gas law relates pressure and volume at constant temperature?

What is the hybridization of the central atom in CH4?

Which species acts as a Bronsted-Lowry acid?

Which indicator changes color over the widest pH range?

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