Biology Chapter 2 And 3 Quiz

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  • 1/8 Questions

    Which of the following can be used to represent a molecule?

    • Name (molecular formula)
    • Electron-shell diagram
    • Structural formula
    • Space filling model
    • All of the above
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About This Quiz

This quiz covers key concepts from Biology chapters 2 and 3, focusing on molecular structures, bond types, and orbital shapes.

Biology Chapter 2 And 3 Quiz - Quiz

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  • 2. 

    Which of the following definitions is INCORRECT?

    • Potential Energy: Energy that matter possesses because of its location or structure

    • Element: Substance that cannot be broken down into other substances by chemical reactions.

    • Compound: Substance consisting of 2 or more different elements combined in a fixed ratio.

    • Trace Elements: Elements required by an organism in only minute quantities.

    • All of the above are true; none are incorrect.

    Correct Answer
    A. All of the above are true; none are incorrect.
    Explanation
    The given correct answer states that all of the definitions provided are true and none of them are incorrect. This means that each definition accurately describes the concepts it is referring to. Therefore, there is no incorrect definition among the options given.

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  • 3. 

    Which of the following definitions is INCORRECT?

    • Cation: negatively charged ion.

    • Anion: positively charged ion

    • Ion: charged atom or molecule

    • A and B

    • None of the above are incorrect.

    Correct Answer
    A. A and B
    Explanation
    The given correct answer is "A and B". This means that both the definitions of cation and anion are incorrect. The definition of cation states that it is a negatively charged ion, which is incorrect as cations are actually positively charged ions. Similarly, the definition of anion states that it is a positively charged ion, which is also incorrect as anions are actually negatively charged ions. Therefore, both A and B are incorrect definitions.

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  • 4. 

    Which of the following is INCORRECT?

    • Atoms and molecules have kinetic energy because they are always randomly moving.

    • Ice is denser than water.

    • Aqueous solution: a solution where water is the solvent.

    • Solvent: dissolving agent of a solution.

    • Solute: substance that is dissolved.

    Correct Answer
    A. Ice is denser than water.
    Explanation
    Ice is denser than water because the molecules in ice are arranged in a regular, hexagonal lattice structure, which creates open spaces or gaps between the molecules. These gaps result in a lower density compared to liquid water, where the molecules are more closely packed together. This is why ice floats on water.

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  • 5. 

    Which of the following is INCORRECT?

    • Hydrogen bond: forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to an electropositive atom (eg. Oxygen, Nitrogen)

    • Van der Waals interactions are weak and only occur when atoms/molecules are very close together.

    • Cohesion: attraction between molecules of the same substance.

    • Polar molecule: opposite ends of the molecule have opposite charges. (eg. water is a polar molecule)

    • Adhesion: attraction between molecules of different substances.

    Correct Answer
    A. Hydrogen bond: forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to an electropositive atom (eg. Oxygen, Nitrogen)
    Explanation
    Hydrogen bond: forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to an electropositive atom (eg. Oxygen, Nitrogen). This statement is correct because a hydrogen bond is a type of intermolecular bond that occurs when a hydrogen atom, which is covalently bonded to a highly electronegative atom such as oxygen or nitrogen, is attracted to an electronegative atom in a different molecule. This attraction is due to the partial positive charge on the hydrogen atom and the partial negative charge on the electronegative atom.

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  • 6. 

    Which of the following is INCORRECT?

    • Hydrogen ion has a positive charge of +1

    • Hydroxide ion has a negative charge of -1

    • [H+][OH-} = 10^-14

    • PH = log [H+]

    • Pure water has a pH of 7, and is when [H+] = [OH-]

    Correct Answer
    A. pH = log [H+]
    Explanation
    The given statement "pH = log [H+]" is incorrect. The correct statement is "pH = -log [H+]", where the negative sign indicates the inverse logarithm. The pH scale measures the acidity or alkalinity of a solution based on the concentration of hydrogen ions. The logarithm of the hydrogen ion concentration is taken to determine the pH value.

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  • 7. 

    Which of the following definitions is CORRECT?

    • The number of electrons is unique to an element, thus defining it.

    • The 3-D space where an electron is found 90% of the time is called a shell.

    • The s orbital has a sphere shape, and the p orbital has a figure-8 shape.

    • Each s orbital can hold 2 electrons, while each p orbital can hold 6.

    • Covalent bonds and ionic bonds are weak chemical bonds.

    Correct Answer
    A. The s orbital has a sphere shape, and the p orbital has a figure-8 shape.
    Explanation
    The explanation for the given correct answer is that the s orbital indeed has a sphere shape, while the p orbital has a figure-8 shape. This is a correct definition of the shapes of these orbitals in atomic structure. The s orbital is spherical in shape and can hold a maximum of 2 electrons, while the p orbital is dumbbell-shaped and can hold a maximum of 6 electrons.

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  • 8. 

    Which of the following is INCORRECT?

    • Hydrophobic = "water hating" & Hydrophilli =: "water loving"

    • Molar mass = Molecular Mass

    • 1 mole = 6.02 x 10^23 "objects"

    • Molarity = number of moles of solute per liter of solution.

    • None of the above are incorrect.

    Correct Answer
    A. Molar mass = Molecular Mass
    Explanation
    The given statement "Molar mass = Molecular Mass" is incorrect because molar mass is the mass of one mole of a substance, while molecular mass is the mass of a single molecule of a substance. Molar mass is calculated by adding up the atomic masses of all the atoms in a molecule, while molecular mass is the sum of the atomic masses of all the atoms in a molecule. Therefore, molar mass and molecular mass are not the same.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Jul 07, 2009
    Quiz Created by
    Sweetorange
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