Q: Which equation correctly represents the calculation of an atom's mass number?

$$\text{Mass number} = \text{Number of protons} + \text{Number of neutrons}$$

Question 1

Which of the following statements best explains why water (H$$_2O) is $$considered a polar molecule?

Accepted Answer

Because oxygen is more electronegative than hydrogen, causing an unequal sharing of electrons and partial charges on the molecule.

Question 2

A neutral atom of carbon has an atomic number of 6 and a mass number of 12. How many neutrons does it have?

Accepted Answer

6

Question 3

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by the transfer of one or more electrons from one atom to another, resulting in oppositely charged ions.

Question 4

Which equation correctly represents the calculation of an atom's mass number?

Accepted Answer

$$	ext{Mass number} = 	ext{Number of protons} + 	ext{Number of neutrons}$$

Question 5

Which of the following is TRUE about acids and bases?

Accepted Answer

Acids release H$$^+$$ ions and have a low pH.

Question 6

Which of the following best describes a redox (oxidation-reduction) reaction?

Accepted Answer

A reaction in which electrons are exchanged between reactants, with one substance losing electrons (oxidized) and another gaining electrons (reduced).

Question 7

Which of the following is NOT a property of water that makes it essential for life?

Accepted Answer

It forms strong ionic bonds with other molecules.

Question 8

Which of the following statements about carbon is correct?

Accepted Answer

Carbon can form up to four covalent bonds because it has four valence electrons.

Question 9

A molecule of NaCl (sodium chloride) is held together by which type of bond?

Accepted Answer

Ionic bond

Question 10

Which of the following best describes a synthesis reaction?

Accepted Answer

A reaction that involves the formation of bonds and the combining of atoms or molecules.

Question 11

Which of the following is a correct example of a decomposition reaction?

Accepted Answer

AB $$\rightarrow A + B$$

Question 12

Which of the following statements about hydrogen bonds is TRUE?

Accepted Answer

Hydrogen bonds are weak attractions between a covalently linked hydrogen and an electronegative atom like oxygen or nitrogen.

Question 13

Which of the following best describes a cation?

Accepted Answer

An atom that loses an electron and has a net positive charge.

Question 14

Which of the following is an example of a polar covalent bond?

Accepted Answer

The bond between oxygen and hydrogen in water (H$$_2O).$$

Question 15

Which of the following is TRUE regarding the octet rule?

Accepted Answer

Atoms are most stable when their outer shell contains 8 electrons, except for the first shell which holds only 2.

Question 16

Which of the following is NOT considered an organic compound?

Accepted Answer

Carbon dioxide (CO$$_2)$$

Question 17

Which of the following is a function of salts (ionic compounds) in the human body?

Accepted Answer

They conduct electricity currents in solution, aiding nerve impulse transmission and muscle contraction.

Question 18

Which of the following best describes a polymer?

Accepted Answer

A long chain of repeating monomer units.

Question 19

Which of the following statements about electronegativity is correct?

Accepted Answer

Electronegativity describes how strongly an atom attracts electrons.

Question 20

Which of the following is a correct example of an exchange (displacement) reaction?

Accepted Answer

AB + CD $$\rightarrow AD + CB$$

Chemistry Foundations for Anatomy & Physiology: Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard