Question 1

Which of the following best describes the difference between a covalent bond and an ionic bond?

Accepted Answer

A covalent bond involves the sharing of electrons between atoms, while an ionic bond involves the transfer of electrons from one atom to another.

Question 2

Which subatomic particle is responsible for the chemical properties of an element and is found in the outermost shell?

Accepted Answer

Electron

Question 3

A radioactive isotope of carbon, $$^{14}C$$, is used in medical imaging. What makes $$^{14}C$$ different from the most common isotope of carbon, $$^{12}C$$?

Accepted Answer

$$^{14}C$$ has more neutrons than $$^{12}C.$$

Question 4

Which of the following elements is NOT one of the four major elements found in living organisms?

Accepted Answer

Calcium

Question 5

Electronegativity is a key concept in understanding chemical bonds. Which statement best describes electronegativity?

Accepted Answer

Electronegativity is the ability of an atom to attract electrons toward itself in a chemical bond.

Question 6

Which type of chemical bond is most likely to form between two atoms with very different electronegativities?

Accepted Answer

Ionic bond

Question 7

A water molecule ($$H_2O) is $$described as polar. What causes this polarity?

Accepted Answer

The oxygen atom has a higher electronegativity, causing an unequal sharing of electrons.

Question 8

Which of the following best describes a hydrogen bond?

Accepted Answer

A hydrogen bond is an attraction between a hydrogen atom covalently bonded to a highly electronegative atom and another electronegative atom.

Question 9

Which of the following is a trace element essential for human health?

Accepted Answer

Iron

Question 10

If an atom has an atomic number of 8 and a mass number of 16, how many neutrons does it have?

Accepted Answer

8

Question 11

Which of the following best explains why noble gases are generally unreactive?

Accepted Answer

They have a full valence electron shell, making them stable.

Question 12

Which type of chemical bond is responsible for the cohesion of water molecules, allowing insects to walk on water?

Accepted Answer

Hydrogen bond

Question 13

A molecule has the formula $$C_6H_{12}O_6$. What is the total number of atoms in one molecule?

Accepted Answer

24

Question 14

Which of the following statements about van der Waals interactions is correct?

Accepted Answer

They are weak attractions that occur between molecules due to temporary fluctuations in electron distribution.

Question 15

Which of the following best describes a chemical reaction?

Accepted Answer

A process in which atoms are rearranged to form new substances.

Question 16

Which of the following is the correct electron configuration for a carbon atom ($$Z=6$$)?

Accepted Answer

$$1s^2$$ $$2s^2$$ $$2p^2$$

Question 17

Which of the following molecules is most likely to have a nonpolar covalent bond?

Accepted Answer

$$O_2$$

Question 18

A sodium atom ($$Na) $$loses one electron to become a sodium ion ($$Na^+). $$What is the charge of the sodium ion?

Accepted Answer

+1

Question 19

Which of the following best describes the octet rule?

Accepted Answer

Atoms tend to gain, lose, or share electrons to achieve eight electrons in their valence shell.

Question 20

Which of the following is a correct example of a chemical equilibrium?

Accepted Answer

The rate of the forward reaction equals the rate of the reverse reaction.

The Chemical Context of Life: Study Notes for General Biology

Guida di studio - Domande di pratica

Study guide - Flashcard