Problem: Do nutrients have an effect on the rate of plant growth? All plants used were the same height
Two groups:
Group A – given 30 mL of distilled water for 7 days
Group B – given 30 mL of water containing .1 gram of fertilizer for 7 days

a. State a possible hypothesis.
b. What are two factors that must be kept the same (constant) between both groups?
c. What is the independent variable?
d. What is the dependent variable?
e. Which is the experimental group?
f. Which is the control group?
g. What must be done to make this experiment valid?

The dipole moment of the water molecule (h2o) is 6.17x10^-30 c.m. consider a water molecule located at the origin whose dipole moment p points in the +x-direction. a chlorine ion ( of charge-1.60x10^-19c , is located at x=3.00x10^-9m . assume that is much larger than the separation d between the charges in the dipole, so that the approximate expression for the electric field along the dipole axis can be used. a) find the magnitude of the electric force that the water molecule exerts on the chlorine ion. b) what is the direction of the electric force. -x-direction or +x-direction c) is this force attractive or repulsive?