Question 1

Which of the following statements correctly describes the relationship between atomic number and atomic mass for a neutral atom?

Accepted Answer

Atomic number equals the number of protons, while atomic mass equals the sum of protons and neutrons.

Question 2

A neutral atom of iron (Fe) has an atomic number of 26 and an atomic mass of 56. How many neutrons does it have?

Accepted Answer

$$56 - 26 = 30$$ neutrons

Question 3

Which element is most likely to form a double covalent bond based on its valence electrons?

Accepted Answer

Oxygen

Question 4

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

Accepted Answer

Oxygen attracts electrons more strongly than hydrogen, creating partial charges.

Question 5

If an atom has 17 protons, 18 neutrons, and 17 electrons, what is its atomic mass?

Accepted Answer

$$17 + 18 = 35$$

Question 6

Which of the following elements is the most electronegative according to the study materials?

Accepted Answer

Fluorine

Question 7

A sodium atom (Na) loses one electron to become Na$$^+. $$What type of bond is formed when Na$$^+$$ interacts with Cl$$^-$$?

Accepted Answer

Ionic bond

Question 8

Which of the following best describes a hydrogen bond?

Accepted Answer

A weak attraction between a slightly positive hydrogen atom and a slightly negative atom of another molecule.

Question 9

How many electrons can the third energy shell hold at maximum capacity?

Accepted Answer

$$18$$ electrons

Question 10

Which of the following molecules is most likely to be non-polar?

Accepted Answer

CO$$_2$$

Question 11

Which of the following statements about valence electrons is correct?

Accepted Answer

Valence electrons determine the chemical reactivity of an atom.

Question 12

Which of the following is a correct statement about isotopes?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons.

Question 13

Which element is present in all proteins and is part of the acronym 'HONC'?

Accepted Answer

Nitrogen

Question 14

Which of the following best describes a double covalent bond?

Accepted Answer

A bond formed by sharing two pairs of electrons.

Question 15

Which of the following elements is most likely to form three covalent bonds to complete its octet?

Accepted Answer

Nitrogen

Question 16

Which of the following is a consequence of adding extra neutrons to an atom?

Accepted Answer

The atomic mass increases.

Question 17

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

Accepted Answer

They have a full complement of valence electrons.

Question 18

Which of the following is true about van der Waals forces?

Accepted Answer

They are weak attractions between non-polar molecules.

Question 19

Which of the following elements is NOT part of the acronym 'S.P.O.N.C.H.'?

Accepted Answer

Fluorine

Question 20

A molecule of methane (CH$$_4) is $$formed when carbon shares electrons with four hydrogen atoms. What type of bond is present in methane?

Accepted Answer

Nonpolar covalent bond

Chapter 2

Guida di studio - Domande di pratica