chem-5-theory1 – Churner

Churner

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Why does H2O act as both a Brønsted-Lowry acid and base?

Because it does not participate in acid-base reactions

Because it can either donate or accept a proton

Because it can either donate or accept a proton, making it amphiprotic

Because it has an equal number of protons and electrons

None

Which of the following best defines a Lewis acid?

A substance that accepts an electron pair

A substance that donates an electron pair

A substance that accepts a proton

A substance that donates a proton

None

What is the conjugate base of H2SO4?

HSO3⁻

HSO4⁻

H2O

SO4²⁻

None

Which of the following correctly explains why HCl is a stronger acid than CH3COOH?

HCl has a lower molecular weight

HCl is less electronegative

HCl has a stronger tendency to donate protons in solution

HCl dissociates partly in water

None

What is the main reason that strong bases, such as NaOH, have a high pH?

They react with acids to form neutral solutions

They fully dissociate in solution, producing a high concentration of H+ ions

They have a low molecular weight

They fully dissociate in solution, producing a high concentration of OH⁻ ions

None

Which of the following statements about water auto-ionization is correct?

The equilibrium constant for auto-ionization is Kw = 1.0 × 10⁻⁷ at 25°C

The concentration of H3O+ and OH⁻ is equal in pure water at 25°C

Water cannot act as both an acid and a base

The auto-ionization of water does not involve proton transfer

None

According to the Brønsted-Lowry definition, what is an acid?

A substance that donates a proton

A substance that accepts a proton

A substance that donates an electron pair

A substance that accepts an electron pair

None

What is the formula for the hydronium ion?

H2O2

H2O

OH-

H3O+

None

Which of the following acids is considered a strong acid in aqueous solution?

H2CO3

HCl

HCN

CH3COOH

None

10.

Which of the following compounds is a strong base?

CH3NH2

NaOH

HCO3⁻

NH3

None

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