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Twelfth Grade (Grade 12) Chemistry Questions

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Grade 12 Thermodynamics
In which of the following systems does the temperature of the process remain constant throughout the system?
  1. Isotherm process
  2. Adiabatic process
  3. Reversible process
  4. Irreversible process
Grade 12 Properties of Matter
Which of the following types of compounds has the highest melting point?
  1. Metallic compounds
  2. Ionic compounds
  3. Covalent compounds
  4. None of the above
Grade 12 Macromolecules
Why are Henrietta Lacks' cells commonly used in laboratory experiments?
  1. they reproduce very quickly
  2. they were left behind
  3. they were very healthy
  4. they didn't reproduce
Grade 12 Biochemical Pathways
Imagine that, in a closed system, there is an input of 1 kJ of light. The light energy is converted into glucose, then ATP, then into mechanical energy. Which statement about the amount of mechanical energy available is true?
  1. There is 1 kJ of mechanical energy available to do work.
  2. Entropy increases with each conversion, so less than 1 kJ is available.
  3. All the reactions involved are anabolic, so there is only 0.25 kJ of energy available.
  4. All the reactions are endergonic, so no mechanical energy is produced.
Grade 12 Molecules and Compounds
Here are a few experimental observations and known facts:

I. A scummy substance often forms in solutions of an amino acid in water.
II. When the water is purified and exposed to UV radiation, the scummy substance does not form in the amino acid solution.
III. UV radiation kills bacteria.

What would be a valid hypothesis based on I, II and III?
  1. The scummy substance is a form of the amino acid.
  2. The scummy substance would not appear if water were treated by a method, other than UV radiation, that kills bacteria
  3. The scummy substance is caused by organisms that humans are unable to detect.
  4. The amino acid would not form the scummy substance in another galaxy
  5. UV light contributes to global warming.
Grade 12 Matter
Which of the following ionic solids has a face-centered cubic (FCC) structure?
  1. Sodium Chloride
  2. Cesium Chloride
  3. Zinc Blende
  4. Fluorite
Grade 12 Thermodynamics
In which of the following cases would ∆U in ∆U=Q+W be less than zero?
  1. Work is done on the system.
  2. Work is done by the system.
  3. The magnitudes of heat and work are equivalent.
  4. The magnitude of heat is greater than that of the work.
Grade 12 Biochemical Pathways
Autotrophic organisms can tap                 sources of energy.
  1. other
  2. common
  3. outside
  4. solar
Grade 12 Oxidation-Reduction Reactions
The oxidation number of P is +3 in which of the following compounds?
  1. H3PO2
  2. H3PO3
  3. H3PO4
  4. H4P2O7
Grade 12 Acids and Bases
Which of the following is used as an indicator for the titration of 0.1 M acetic acid with 0.1 M sodium hydroxide?
  1. Thymol blue
  2. Methyl orange
  3. Bromothymol blue
  4. Phenolphthalein
Grade 12 Chemistry
Water is one of the most important substances found on Earth, and it is classified as the
  1. complete solvent.
  2. basic solvent.
  3. universal solvent.
  4. acidic solvent.
Grade 12 Macromolecules
Which enzyme acts as a catalyst in the reaction of CO2 with water in the human body?
  1. carbonic anhydrase
  2. catalase
  3. amylase
  4. nitrogenase
Grade 12 Chemistry
As water molecules undergo freezing,                                     .
  1. it cools its surrounding environment
  2. it loses its polarity
  3. its molecules move farther apart
  4. its hydrogen bonds break apart
Grade 12 Molecules and Compounds
According to VSEPR theory, what is the order in which repulsions between electron pairs decreases?
  1. lone pair-lone pair> lone pair-bond pair> bond pair-bond pair
  2. lone pair-lone pair> bond pair-bond pair>lone pair-bond pair
  3. bond pair-bond pair>lone pair-bond pair>lone pair-lone pair
  4. lone pair-bond pair>lone pair-lone pair>bond pair-bond pair
Grade 12 Kinetics and Equilibrium
In a reversible chemical reaction, which of the following parameters remains unchanged even with the addition of a catalyst?
  1. Equilibrium constant
  2. Rate of reaction
  3. Percentage yield of reaction
  4. Concentration of reactants
Grade 12 Kinetics and Equilibrium
The equilibrium, H2O(l)↔H+(aq)+OH-(aq), is
  1. dynamic.
  2. static.
  3. physical.
  4. mechanical.
Grade 12 Biochemical Pathways
How does fermentation compensate for the lack of oxygen in terms of electron acceptors?
  1. Fermentation creates an alternative pathway for NADH to be recycled back into NAD+.
  2. Fermentation prevents glucose from being completely oxidized so the number of electrons is limited.
  3. Fermentation creates carbon dioxide to serve as the final electron acceptor during the Kreb's cycle.
  4. Fermentation can oxidize many other substances even without the presence of oxygen.
Grade 12 Acids and Bases
What do you call the solution that is added from the buret in a titrimetric analysis?
  1. Titrant
  2. Titrate
  3. Indicator
  4. Reagent
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