Chapter 2 The Chemistry of Life Part 1

Open Ended

Question of the Day: Why do you think understanding the chemistry of life is important for studying biology?

Multiple Choice

Which of the following statements best describes matter?

• Matter is composed of atoms and occupies space.

• Matter is made only of elements and does not have mass.

• Matter is composed of molecules and does not occupy space.

• Matter is only found in living organisms.

Multiple Select

Which of the following are subatomic particles found in atoms?

• Protons

• Neutrons

• Electrons

• Molecules

Open Ended

Using the information from the table, calculate the number of neutrons for the element with atomic number and mass number.

Multiple Choice

Which isotope of hydrogen contains two neutrons?

• Protium

• Deuterium

• Tritium

• Hydronium

Multiple Choice

Which isotope is commonly used for dating carbon-containing remains less than 50,000 years old?

• Carbon-14

• Uranium-238

• Potassium-40

• Rubidium-87

Multiple Select

Select all statements that are true about reversible and irreversible reactions.

• Irreversible reactions proceed in one direction until all reactants are used up

• Reversible reactions allow products to convert back to reactants

• All chemical reactions are irreversible

• Reversible reactions never reach equilibrium

Open Ended

Think-pair-share: Compare and contrast ionic and covalent bonds in terms of electron transfer and sharing.

Multiple Choice

Which of the following statements best explains why water is a polar molecule?

• Because oxygen has a higher electronegativity than hydrogen, causing unequal sharing of electrons.

• Because hydrogen has a higher electronegativity than oxygen, causing equal sharing of electrons.

• Because both oxygen and hydrogen have the same electronegativity, resulting in a nonpolar molecule.

• Because water has a linear molecular shape.

Open Ended

Why is carbon dioxide a nonpolar molecule even though the oxygen-carbon bond is a polar covalent bond?

Multiple Choice

What does a difference in electronegativity between two atoms in a covalent bond determine?

• Whether the bond is polar or nonpolar

• The atomic mass of the molecule

• The number of protons in the atoms

• The color of the compound

Multiple Select

Which of the following pairs of atoms will form a polar covalent bond based on their electronegativity difference?

• C and O

• N and N

• C and F

• N and H

Multiple Choice

Which of the following best describes a hydrogen bond?

• A strong bond formed by sharing electrons between atoms

• A weak interaction between the δ+ of hydrogen and the δ- of a more electronegative atom on another molecule

• A weak attraction between molecules due to changes in electron density

• A bond that requires energy to break

Open Ended

What is one question you still have about atoms, isotopes, ions, or molecules after today's lesson?