2. Cell Chemistry & Cell Components

A proton ___________:

a) Has one positive charge.

b) Has one AMU.

c) Is found in the nucleus of the atom.

d) Only a and b are true.

e) a, b, and c are true.

The average oxygen atom has a mass number of 16 and an atomic number of 8. This means that the number of neutrons in this oxygen atom is:

a) 24.

b) 8.

c) 16.

d) 4.

e) 2.

How many valence electrons does an atom with five total electrons have?

a) 5.

b) 7.

c) 3.

d) 2.

e) 1.

Which of the following is true about electron energy shells?

a) They represent regions around the nucleus in which the electrons orbit.

b) The shells closest to the nucleus contain electrons with higher energy.

c) They contain electrons of the same energy.

d) a and b only.

e) a and c only.

A neon atom (Ne) is unreactive for which of the following reasons?

a) It has 7 valence electrons.

b) It has 8 valence electrons.

c) Its valence shell is full of electrons. 

d) It has 20 valence electrons.

e) b and c only.

How many electrons does an Oxygen atom need to fulfill the octet rule by filling its valence shell?

a) 8.

b) 4.

c) 1.

d) 2.

e) 6.

Which of the following statements correctly describes a solution?

a. In a solution the solute is chemically dissolved by the solvent.

b. Solutions involve large particles suspended in another component.

c. The particles in a solution will settle out if left to sit.

d. The amount of solute in a solution is expressed as the solution's concentration.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

a. The mass number of an atom is the sum of its neutrons and protons.

Match the following terms with the correct definition:

_____Endergonic reaction a. Energy in motion

_____Potential energy b. Energy stored in chemical bonds

_____Electrical energy c. Reaction that consumes energy

_____Anabolic reaction d. A decomposition reaction

_____Oxidation-reduction reaction e. The energy of moving charged particles

_____Chemical energy f. Stored energy     

_____Catabolic reaction g. Synthesis reaction     

_____Kinetic energy h. Reaction where electrons are transferred between reactants

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

b. Protons and neutrons have a positive charge and electrons have a negative charge.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

c. Valence electrons are the electrons in the outermost shell of an atom.

Mark the following statements as true or false. If a statement is false, correct it to make a true statement.

d. Every element has a characteristic number of protons, which is called the element's mass number.