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Twelfth Grade (Grade 12) Chemistry Questions

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Grade 12 Macromolecules
These monomers link together to form proteins.
  1. amino acids
  2. saccharides
  3. fatty acids
  4. polymers
Grade 12 Macromolecules
Energy is transferred via
  1. fat.
  2. inhibitors.
  3. electromagnetic waves (photons).
  4. telephoto lenses.
Grade 12 Atomic Structure
Which of the following has the least mass?
  1. proton
  2. neutron
  3. electron
  4. hydrogen
  5. a feather
Grade 12 Oxidation-Reduction Reactions
The oxidation number of I in HOI is                .
  1. -1
  2. 0
  3. -2
  4. +1
Grade 12 Macromolecules
Drugs, pathogens, pesticides, and metabolic imbalances are examples of
  1. enzyme activators.
  2. enzyme inhibitors.
  3. enzyme reaction.
  4. enzyme converters.
Grade 12 Macromolecules
The part of an enzyme that substrate molecules fit into is the
  1. enzyme.
  2. substrate.
  3. product.
  4. active site.
Grade 12 Biochemical Pathways
What term describes the collective sum of all the chemical reactions within a living structure?
  1. energetics
  2. activity
  3. metabolism
  4. entropy
Grade 12 Reactions
Which of the following properly completes the following chemical equation: SiO2+2Mg →?
  1. Si + 2MgO
  2. Si2O+Mg
  3. SiO2+Mg2O
  4. Si+MgO2
Grade 12 Organic Chemistry
What would be the IUPAC name of the following compound?

CH≡C-CH2-C≡CH
  1. Pent-2,4-diyne
  2. Pent-1,4-diyne
  3. Pent-1,3-diyne
  4. Pent-1,2-diyne
Grade 12 Acids and Bases
What is the conjugate acid of NH-2?
  1. NH4OH
  2. NH3
  3. H2N-OH
  4. C6H5NH2
Grade 12 Macromolecules
Which enzyme is missing if a person cannot digest lactose?
  1. sucrase
  2. glucase
  3. lactase
  4. protease
  5. trypsin
Grade 12 Organic Chemistry
Which of the following conversions is an example of a substitution reaction?
  1. Acetylene → Ethane
  2. Sodium acetate → Methane
  3. Propylene → Propane
  4. Ethane → Chloroethane
Grade 12 Oxidation-Reduction Reactions
Based on the unbalanced reaction below,

CrO2-4(aq)→Cr(OH)-4(aq)

Chromium undergoes which of the following processes?
  1. an oxidation
  2. a redox reaction
  3. a reduction
  4. an electron transfer equation
Grade 12 Thermodynamics
Which system permits energy and matter to be exchanged with the surroundings?
  1. Isolated
  2. Open
  3. Adiabatic
  4. Closed
Grade 12 Periodic Table and Elements
Actinides belong to the following type of elements:
  1. s-block elements
  2. d-block elements
  3. f-block elements
  4. p-block elements
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