$$\text{5 valence electrons, 3 bonds}$$

Question 1

Which organelle is primarily responsible for producing ATP through cellular respiration in eukaryotic cells?

Accepted Answer

Mitochondrion

Question 2

Where in a eukaryotic cell would you expect to find most of the cell's DNA?

Accepted Answer

Nucleus

Question 3

Which of the following best describes the difference between prokaryotic and eukaryotic cells?

Accepted Answer

Eukaryotic cells have membrane-bound organelles, prokaryotic cells do not.

Question 4

Which of the following elements makes up the largest percentage of human body mass?

Accepted Answer

Oxygen

Question 5

How many valence electrons does a nitrogen atom have, and how many covalent bonds does it typically form?

Accepted Answer

$$	ext{5 valence electrons, 3 bonds}$$

Question 6

Which type of chemical bond involves the sharing of electron pairs between atoms?

Accepted Answer

Covalent bond

Question 7

A sodium atom (Na) reacts with a chlorine atom (Cl) to form sodium chloride (NaCl). What type of bond is formed, and what happens to the electrons?

Accepted Answer

Ionic bond; sodium donates an electron to chlorine

Question 8

Given the electronegativity values: H = 2.1, O = 3.4, what type of bond is formed between hydrogen and oxygen in a water molecule?

Accepted Answer

Polar covalent bond

Question 9

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

Accepted Answer

Oxygen is more electronegative than hydrogen, creating partial charges

Question 10

Which of the following molecules is most likely to form non-polar covalent bonds?

Accepted Answer

O$$_2$$

Question 11

What is the atomic number of carbon, and what does it represent?

Accepted Answer

$$6$$, which represents the number of protons in the nucleus

Question 12

Which of the following best describes the 'octet rule' in chemistry?

Accepted Answer

Atoms are most stable when they have 8 electrons in their outermost shell

Question 13

Which of the following is a correct molecular formula for glucose?

Accepted Answer

$$\mathrm{C_6H_{12}O_6$}$$

Question 14

Which of the following statements about the chemical composition of an egg is most accurate?

Accepted Answer

An egg contains water, amino acids, fatty acids, sugars, and many other chemicals

Question 15

Which of the following best describes the relationship between atoms, molecules, organelles, and cells?

Accepted Answer

Atoms combine to form molecules, which make up organelles, which are components of cells

Question 16

Which of the following best explains why sodium (Na) is highly reactive?

Accepted Answer

It has one electron in its outermost shell, making it unstable

Question 17

Which of the following is true about the chemical reactivity of atoms?

Accepted Answer

It is determined by the number of electrons in the outermost shell

Question 18

Which of the following best describes a redox reaction?

Accepted Answer

A reaction involving the transfer of electrons from one atom to another

Question 19

Which of the following statements about electronegativity is correct?

Accepted Answer

Oxygen and nitrogen are highly electronegative and attract electrons strongly

The Chemical Context of Life: Atoms, Molecules, and Bonds

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