Chemical Concepts and Calculations

Dr. Hannah Asseel reviews a past AS Chemistry paper, covering topics like sulfur concentration in diesel, ionization energy, mass spectrometry, sodium reactions, chemical bonding, periodic table trends, and alkanes/alkenes. The video provides detailed explanations and calculations, helping students understand key chemistry concepts and prepare for exams.

How do you calculate the parts per million (ppm) of sulfur in diesel fuel?

• Mass of sulfur in grams divided by total mass in grams times 10^6

• Mass of sulfur in milligrams divided by total mass in grams times 10^6

• Mass of sulfur in kilograms divided by total mass in grams times 10^6

• Mass of sulfur in grams divided by total mass in kilograms times 10^6

What is the maximum volume of sulfur dioxide produced from burning 3.2 kg of diesel fuel containing 10 mg of sulfur per kg?

• 0.024 dm³

• 0.032 dm³

• 0.012 dm³

• 0.048 dm³

Which equation represents the second ionization energy of chlorine?

• Cl → Cl⁺ + e⁻

• Cl⁺ → Cl²⁺ + e⁻

• Cl⁻ → Cl + e⁻

• Cl²⁺ → Cl³⁺ + e⁻

In mass spectrometry, what process occurs at the R stage?

• Acceleration

• Ionization

• Deflection

• Vaporization

What is the atom economy for the production of magnesium hydroxide from sodium hydroxide and magnesium sulfate?

• 29.1%

• 100.0%

• 50.0%

• 75.0%

Which series of elements is in order of increasing melting temperatures?

• Iodine, Bromine, Chlorine, Fluorine

• Lithium, Beryllium, Boron, Carbon

• Silicon, Phosphorus, Sulfur, Chlorine

• Lithium, Sodium, Potassium, Rubidium

Why is aluminum used for overhead power cables?

• It is a poor conductor of electricity

• It is not ductile

• It has a high density

• It is resistant to corrosion

What is the empirical formula of a compound with 12g of calcium, 8.43g of silicon, and 14.47g of oxygen?

• CaSiO₃

• CaSiO₂

• Ca₂SiO₄

• CaSiO

What is the skeletal formula of E-2-chlorobut-2-ene?

• C-C=C-C

• C-C=C-Cl

• C=C-C-C

• C=C-C-Cl

What is the main hazard when using butane as a fuel in a portable heater in an enclosed space?

• Production of carbon dioxide

• Production of carbon monoxide

• Production of water vapor

• Production of sulfur dioxide