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Twelfth Grade (Grade 12) Chemistry Questions

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Grade 12 Macromolecules
Which functional group is represented by the structure?
Structural Formula - Amine
  1. carboxyl
  2. amino
  3. phosphate
  4. methyl
Grade 12 Acids and Bases
Which of the following reactions represents the titration of a weak acid with a strong base?
  1. CH3COOH+NaOH→CH3COONa+H2O
  2. HCl+NaOH→NaCl+H2O
  3. NH4OH+HCl→H2O+NH4Cl
  4. NH4OH+CH3COOH→CH3COONH4+H2O
Grade 12 Thermodynamics
Which of the following equations is used to represent the First Law of Thermodynamics for a closed system, according to the IUPAC convention?
  1. ΔU=Q+W
  2. ΔU=W-Q
  3. ΔU=Q-W
  4. ΔU=Q+2W
Grade 12 Periodic Table and Elements
The first attempt to classify elements was made by                .
  1. Mendeleev
  2. Neslands
  3. Lother Meyer
  4. Bobereiner
Grade 12 Macromolecules

This question is a part of a group with common instructions. View group »

Which protein structure gives the protein its actual function?
  1. primary
  2. secondary
  3. tertiary
  4. quarternary
Grade 12 Macromolecules
All organisms "pay their energy bill" using this substance.
  1. money
  2. cells
  3. protein
  4. ATP
Grade 12 Organic Chemistry
Which of the following alkanes contains a (CH3)2CH- group?
  1. 2, 2-Dimethylpentane
  2. 3,3-Dimethylpentane
  3. 2,3-Dimethylpentane
  4. 3,4-Dimethylhexane
Grade 12 Thermodynamics
Which of the following is an example of spontaneous processes?
  1. Electrolysis
  2. Combustion
  3. Photosynthesis
  4. The rusting of iron
Grade 12 Oxidation-Reduction Reactions
The oxidation number of Cl in KClO3 is                .
  1. -1
  2. -5
  3. +1
  4. +5
Grade 12 Thermodynamics
Which of the following terms comprises the surroundings and the system involved in the study of thermodynamics?
  1. an open system
  2. a closed system
  3. an isolated system
  4. the universe
Grade 12 Biochemical Pathways
At the end of the mitochondrial electron transport chain, electrons are
  1. donated to NADH to make NAD+.
  2. added to protons and oxygen to make water.
  3. pumped across the membrane to make ATP.
  4. added to ADP to make ATP.
  5. removed from ATP to yield energy.
Grade 12 Matter
The basic building blocks of elements are called
  1. eons.
  2. silica tetrahedra.
  3. minerals.
  4. atoms.
Grade 12 Acids and Bases
Which of the following salts is formed from a strong acid and a weak base?
  1. NH4Cl
  2. CH3COONH4
  3. KCN
  4. KNO3
Grade 12 Thermodynamics
If ΔS denotes entropy change, then what is the entropy change for a reversible adiabatic process?
  1. ΔS=0
  2. ΔS=1
  3. ΔS<1
  4. ΔS>1
Grade 12 Organic Chemistry
An alkane is obtained by decarboxylation of sodium propionate. The same alkane can be obtained by
  1. catalytic hydrogenation of propene.
  2. action of sodium metal on iodomethane.
  3. reduction of 1-chloropropane.
  4. reduction of bromomethane.
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