Question 1

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by the sharing of electrons between atoms.

Question 2

Which element is NOT one of the six major elements (CHNOPS) that make up 97.6% of the human body mass?

Accepted Answer

Iron (Fe)

Question 3

What is the main difference between ionic and covalent bonds?

Accepted Answer

Ionic bonds involve donating electrons, while covalent bonds involve sharing electrons.

Question 4

Which of the following best explains why water molecules are able to stick to each other?

Accepted Answer

Water molecules form hydrogen bonds due to partial charges.

Question 5

A sodium atom ($$\mathrm{Na}) $$reacts with a chlorine atom ($$\mathrm{Cl}) to $$form sodium chloride ($$\mathrm{NaCl}). $$What type of bond is formed?

Accepted Answer

Ionic bond

Question 6

Which of the following statements about valence electrons is TRUE?

Accepted Answer

Valence electrons are involved in chemical bonding and reactions.

Question 7

Which property of water is primarily responsible for its ability to move up plant stems against gravity?

Accepted Answer

Cohesion due to hydrogen bonding

Question 8

Which of the following is a trace element required in small amounts by the human body?

Accepted Answer

Iodine (I)

Question 9

If an atom has 6 protons, 6 neutrons, and 6 electrons, what is its atomic number and mass number?

Accepted Answer

Atomic number: 6, Mass number: 12

Question 10

Which of the following best describes a polar covalent bond?

Accepted Answer

Electrons are shared unequally, creating partial charges.

Question 11

Which formula correctly represents the formation of sodium chloride from sodium and chlorine?

Accepted Answer

$$\mathrm{Na} + \mathrm{Cl} \rightarrow \mathrm{NaCl}$$

Question 12

Which of the following is responsible for the adhesion of water to other surfaces?

Accepted Answer

Hydrogen bonding between water molecules and other substances

Question 13

Which statement about the nucleus of an atom is correct?

Accepted Answer

The nucleus contains protons and neutrons.

Question 14

Which of the following is an example of a molecule with a triple covalent bond?

Accepted Answer

$$\mathrm{N}_2$$

Question 15

Which of the following best explains why table salt ($$\mathrm{NaCl}) $$dissolves easily in water?

Accepted Answer

Water forms hydrogen bonds with the ions, separating them.

Question 16

Which of the following is the correct electron configuration for a helium atom ($$\mathrm{He}$$)?

Accepted Answer

2 electrons in the first shell

Question 17

Which of the following is a consequence of hydrogen bonding in water?

Accepted Answer

Water molecules stick together, leading to surface tension.

Question 18

Which of the following best describes the role of trace elements in the human body?

Accepted Answer

They are required in small amounts for specific biological functions.

Question 19

Which of the following is true about the distribution of electrons in atomic shells?

Accepted Answer

The first shell is complete with 2 electrons.

Question 20

Which of the following is a real-world example of an ionic bond?

Accepted Answer

The bond between sodium and chlorine in table salt.

Chemical Bonds and Elements of Life: Study Notes for General Biology

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