Unit 2 Test Review

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.

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.

When water molecules stick easily to other water molecules, this is called what?

• cohesion
• adhesion
• solution
• polar molecule

What characteristic is shown in the image?

• Polarity

• Hydrogen Bonds

• Cohesion

• Adhesion

What do the green bonds represent?

• Covalent Bond

• Hydrogen Bond

• Ionic Bond

Why does water move from the roots to the leaves of plants?

• Water is pushed by solutes
• Capillary action pulls the water molecules like a chain
• Water is pulled by gravity
• Water’s cohesion causes it to “pull” towards the leaves

When you step out into the cold, your body shivers in order to keep its temperature at 98.6F. Which characteristic of life does this represent?

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

Green plants produce their own food through the process of photosynthesis. Which characteristic of life does this represent?

• All living things use energy

• All living things contain cells

• All living things maintain homeostasis

• All living things grow

Over three years, Tim's height has increased from 5'4" to 5'11". Which characteristic of life does this represent?

• All living things contain cells

• All living things maintain homeostasis

• All living things use energy

• All living things grow

The roots of a plant grow towards a source of ground water.

• All living things use energy
• All living things reproduce
• All living things respond to their environment
• All living things grow