Biology Chapter 2 And 3 Quiz
Ch 2 and 3. Campbell Biology.
- 1.
Which of the following definitions is INCORRECT?
- A.
Potential Energy: Energy that matter possesses because of its location or structure
- B.
Element: Substance that cannot be broken down into other substances by chemical reactions.
- C.
Compound: Substance consisting of 2 or more different elements combined in a fixed ratio.
- D.
Trace Elements: Elements required by an organism in only minute quantities.
- E.
All of the above are true; none are incorrect.
Correct Answer
E. 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.Rate this question:
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- 2.
Which of the following definitions is CORRECT?
- A.
The number of electrons is unique to an element, thus defining it.
- B.
The 3-D space where an electron is found 90% of the time is called a shell.
- C.
The s orbital has a sphere shape, and the p orbital has a figure-8 shape.
- D.
Each s orbital can hold 2 electrons, while each p orbital can hold 6.
- E.
Covalent bonds and ionic bonds are weak chemical bonds.
Correct Answer
C. 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.Rate this question:
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- 3.
Which of the following can be used to represent a molecule?
- A.
Name (molecular formula)
- B.
Electron-shell diagram
- C.
Structural formula
- D.
Space filling model
- E.
All of the above
Correct Answer
E. All of the aboveExplanation
All of the options listed can be used to represent a molecule. The name (molecular formula) provides information about the composition of the molecule, the electron-shell diagram shows the arrangement of electrons in the molecule's atoms, the structural formula depicts the connectivity between atoms, and the space filling model gives a three-dimensional representation of the molecule's atoms and their relative sizes. Therefore, all of these methods can be used to represent a molecule.Rate this question:
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- 4.
Which of the following definitions is INCORRECT?
- A.
Cation: negatively charged ion.
- B.
Anion: positively charged ion
- C.
Ion: charged atom or molecule
- D.
A and B
- E.
None of the above are incorrect.
Correct Answer
D. A and BExplanation
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.Rate this question:
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- 5.
Which of the following is INCORRECT?
- A.
Hydrogen bond: forms when a hydrogen atom covalently bonded to one electronegative atom is also attracted to an electropositive atom (eg. Oxygen, Nitrogen)
- B.
Van der Waals interactions are weak and only occur when atoms/molecules are very close together.
- C.
Cohesion: attraction between molecules of the same substance.
- D.
Polar molecule: opposite ends of the molecule have opposite charges. (eg. water is a polar molecule)
- E.
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.Rate this question:
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- 6.
Which of the following is INCORRECT?
- A.
Atoms and molecules have kinetic energy because they are always randomly moving.
- B.
Ice is denser than water.
- C.
Aqueous solution: a solution where water is the solvent.
- D.
Solvent: dissolving agent of a solution.
- E.
Solute: substance that is dissolved.
Correct Answer
B. 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.Rate this question:
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- 7.
Which of the following is INCORRECT?
- A.
Hydrophobic = "water hating" & Hydrophilli =: "water loving"
- B.
Molar mass = Molecular Mass
- C.
1 mole = 6.02 x 10^23 "objects"
- D.
Molarity = number of moles of solute per liter of solution.
- E.
None of the above are incorrect.
Correct Answer
B. Molar mass = Molecular MassExplanation
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.Rate this question:
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- 8.
Which of the following is INCORRECT?
- A.
Hydrogen ion has a positive charge of +1
- B.
Hydroxide ion has a negative charge of -1
- C.
[H+][OH-} = 10^-14
- D.
PH = log [H+]
- E.
Pure water has a pH of 7, and is when [H+] = [OH-]
Correct Answer
D. 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.Rate this question:
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Mar 20, 2023Quiz Edited by
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Jul 07, 2009Quiz Created by
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