Macromolecules & Properties of Water Test

1. Which of these cannot be separated into its parts by an ordinary chemical or physical process?

• An atom of carbon (C)
• A mixture of salts (NaCl, KI)
• An acid of chlorine (HCl)
• A compound of nitgrogen (NH3)

2. An atom is composed of electrons, protons, and neutrons. What is the electric charge on the neutron?

• -1
• +2
• +1
• 0

3. A proton has which of the following charges?

• Neutral
• Positive
• Magnetic
• Negative

4. A student makes a drawing of a carbon atom. Which of these should the student show in the nucleus of the atom? Check all that apply.

• Ions
• Electrons
• Protons
• Neutrons

5. Why is water known as the "universal solvent"?

• It dissolves all known substances on Earth.
• It dissolves only solid substances.
• It dissolves substances faster than all other substances.
• It dissolves the greatest number of substances compared to other substances.

6. What is responsible for the hydrogen bond shown in the diagram below?

• The transfer of electrons between hydrogen atoms.
• The attraction between a negative oxygen of one molecule and a positive hydrogen of another.
• The negative oxygens repel the positive hydrogens.
• The sharing of electrons between two different molecules.

7. A mist is rising off this lake because the water is warmer than the air. This is an example of -

• surface tension at the top of the lake.
• water having a high specific heat.
• capillary action moving water vapor upward.
• the negative charge at the surface of the water repels the negative charges of the water vapor.

8. What property of water allows droplets of water to form?

• High specific heat
• Adnesion
• Cohesion
• Capillary action

9. Is a substance with a pH of 1 more acidic than a substance with a pH of 4?

• Yes
• No
• They are the same strength.

10. The diagram below shows how water can travel up the tissues of a tree against the force of gravity. This is made possible by a property known as capillary action. Capillary action happens when what two properties work together?

• adhesion and cohesion
• surface tension and density anomaly
• high specific heat and cohesion
• universal solvent and adhesion