chem-5-theory1 – Churner

Churner

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Which of the following compounds is a strong base?

NH3

NaOH

HCO3⁻

CH3NH2

None

Which of the following best defines a Lewis acid?

A substance that donates a proton

A substance that accepts an electron pair

A substance that donates an electron pair

A substance that accepts a proton

None

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

HCl is less electronegative

HCl dissociates partly in water

HCl has a stronger tendency to donate protons in solution

HCl has a lower molecular weight

None

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

The auto-ionization of water does not involve proton transfer

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

Water cannot act as both an acid and a base

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

None

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

A substance that accepts a proton

A substance that donates a proton

A substance that accepts an electron pair

A substance that donates an electron pair

None

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

Because it has an equal number of protons and electrons

Because it can either donate or accept a proton

Because it does not participate in acid-base reactions

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

None

What is the formula for the hydronium ion?

H2O

H3O+

H2O2

OH-

None

What is the conjugate base of H2SO4?

HSO4⁻

HSO3⁻

H2O

SO4²⁻

None

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

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

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

They react with acids to form neutral solutions

They have a low molecular weight

None

10.

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

HCN

CH3COOH

H2CO3

HCl

None

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