2025 Concept 2 Notes - Chemistry of Life

Multiple Choice

Which of the following elements is NOT one of the six elements necessary for life?

• Carbon

• Hydrogen

• Calcium

• Phosphorus

Multiple Choice

Which of the following best describes a polar molecule?

• A molecule with an unequal distribution of charges, resulting in positive and negative poles.

• A molecule with no separation of charge, so no positive or negative poles are formed.

• A molecule that is always a gas at room temperature.

• A molecule that cannot dissolve in water.

Open Ended

Explain how the polarity of water contributes to its ability to dissolve many substances.

Multiple Select

Which of the following are properties of water?

• Cohesion

• Adhesion

• High specific heat

• Low density as a solid

Multiple Choice

Why can life exist under the frozen surfaces of lakes and polar seas?

• Because ice is denser than liquid water and sinks to the bottom.

• Because ice is less dense than liquid water and floats, insulating the water below.

• Because water does not freeze at low temperatures.

• Because ice dissolves in water, keeping it liquid.

Multiple Select

Which of the following substances are hydrophilic?

• Salt

• Oil

• Sugar

• Sand

Open Ended

Reflecting on today's lesson about the organization of life, what is one new thing you learned or found interesting about the basic units and elements that make up living organisms?

Multiple Choice

What are the six elements necessary for life as mentioned in the organization of life?

• C, H, O, N, P, S

• C, H, O, Na, Cl, K

• C, H, O, Fe, Mg, Ca

• C, H, O, F, I, Zn