2. What feature of water molecules enables ionic substance to dissolve in water?
The water molecules have a certain shape that allows them to surround the ions
in solution.
® The water molecules react with the ions.
©
The water molecules are sticky and can adhere to the ions.
The water molecules are polar and are attracted to the positive and negative
ions, surrounding them.

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?

If a simple machine reduces the strength of a force, what must be increased?

Arunner is jogging at a steady 3.6 km/hr. when the runner is 2.9 km from the finish line, a bird begins flying from the runner to the finish line at 14.4 km/hr (4 times as fast as the runner). when the bird reaches the finish line, it turns around and flies back to the runner. even though the bird is a dodo, we will assume that it occupies only one point in space, i.e., a zero-length bird. how far does the bird travel? (b) after this first encounter, the bird then turns around and flies from the runner back to the finish line, turns around again and flies back to the runner. the bird repeats the back and forth trips until the runner reaches the finish line. how far does the bird travel from the beginning? (i.e. include the distance traveled to the first encounter)