Unit 1-3 Review

What word describes when water is attracted to other substances?

• cohesion
• adhesion
• capillary action
• surface tension

Why does ice float?

• As water freezes, it expands and its density decreases.
• As water freezes, it takes up more hydrogen from the atmosphere, causing it to have a greater buoyancy.
• As water freezes, air becomes trapped between the hydrogen bonds of water molecules.
• As water freezes, it takes up more oxygen from the atmosphere, causing it to have a greater buoyancy.

Which of the following is LEAST likely to dissolve in water?

• nonpolar fats and oils
• polar sugar molecules
• salt made of a positive sodium ion and a negative chloride ion
• all of the substances will dissolve easily in water

Large bodies of water, such as lakes and oceans, do not quickly fluctuate in temperature. What is the reason for this phenomenon?

• Water is an acid.
• Water is a versatile solvent.
• Water has a high heat capacity.
•  Water acts as a buffer.

The tightness across the surface of water that enables paper clips to float is ____________.

• adhesion
• capillary action
• surface tension
• polarity

When a molecule has an opposite electrical charge on each end, it is known as what?

• cohesion
• polar molecule
• hydrogen bond
• solution

What macromolecule is made up of C,H,O,N?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

What is the function of Carbohydrates?

• Long-term energy

• Muscle development

• Short-term energy

• enzyme activity

Which one of the macromolecules are instrumental in the cell membrane?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids

Which macromolecule is structured this way?

• Carbohydrates

• Lipids

• Proteins

• Nucleic acids