Semester Review

Multiple Choice

What is the difference between an element and a compound?

• An element contains only one type of atom, while a compound is made of two or more different elements.

• An element can be broken down into simpler substances, while a compound cannot.

• An element is a pure substance, while a compound is a mixture of substances.

• An element is always a solid, while a compound can be a solid, liquid, or gas.

Multiple Choice

Water droplets take a spherical shape (as pictured) because of ____________

• adhesion
• cohesion
• capillary action
• solubility
• frozen water is less dense

Multiple Choice

Why does this water form droplets instead of spreading out in a sheet?

• Because of adhesion

• Because of cohesion

• Because of surface tension

• Because of gravity

Multiple Select

Refer to the picture of water sticking to a leaf; this is occurring because of:

• Adhesion

• Cohesion

• surface tension

• melting point

Multiple Choice

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

• Water is pushed by solutes

• Capillary action caused by both cohesion and adhesion pulls the water up the plant stem.

• Water is pulled by gravity

• Only cohesion causes it to go up the plant.

Multiple Choice

Which is NOT caused by acid rain?

• damage to statues

• dying fish

• spread of disease

• weakened trees

Multiple Choice

Look at the pictures above. A shows the bag before the vinegar and baking soda are mixed together, and B shows it after they are mixed together. In which picture do the contents of the bag have the greater mass?

• The mass is greater in A—before they are mixed.

• The mass is greater in B—after they are mixed.

• The mass is the same in both.

• The mass depends on the temperature.

Poll

How confident do you feel about this topic now?

• Very confident
• Somewhat confident
• Not confident