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.
- 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.
- 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
- 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.
- 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.
- 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.
- 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.
- 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-]
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