Chemistry Quiz

Which of the following is NOT a step in gravimetric analysis?

• Precipitation

• Titration

• Filtration

• Drying

Bohr’s model of the atom was successful in explaining:

• The spectra of multi-electron atoms

• The shape of electron orbitals

• The quantization of electron energy levels in hydrogen

• The uncertainty principle

Which of the following elements has the highest electronegativity?

• Sodium

• Carbon

• Oxygen

• Fluorine

The wavelength of light emitted when an electron transitions from n=3 to n=2 falls in which region of the electromagnetic spectrum?

• Infrared

• 
  Ultraviolet

• visible

• X-ray

In the reaction: 2H₂ + O₂ → 2H₂O, which substance is the oxidizing agent?

• H₂

• O₂

• H₂O

• None

What is the standard enthalpy change of formation (ΔHf°) of an element in its most stable form?

• 0 kJ/mol

• 1 kJ/mol

• -100 kJ/mol

• Depends on the element

Compare the Bohr model and the quantum mechanical model of the atom. What key improvements does the quantum model offer?

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Explain two possible sources of error in gravimetric analysis and how they affect the final result.

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Does Bohr’s model correctly explain the spectra of all elements in the periodic table?

• Yes

• No

Can the dilution formula M1V1=M2V2M_1V_1 = M_2V_2M1​V1​=M2​V2​ be used to find the final concentration after mixing two different solutions?

• Yes

• No

Answer explanation

The dilution formula applies when diluting a solution with a solvent, not when mixing two solutions with different concentrations.