James had a fixation on how to best preserve fresh cut flowers. He tried various methods: adding bleach to the water, using filtered water, adding an aspirin tablet to the water, using a combination of sugar and water, using cold water, and using hot water. Over the course of his study, he came to the conclusion that while bleach changed the color of the plant, it did allow for the plant to last longer than the other changes. Based on this study, the dependent variable is: 1. Type of plant 2. Life of the cut plant 3. Color of the plant 4. Changes to the water

What type of force holds atoms together in a crystal?

How do you count the total number of atoms present on one side of a chemical equation?

You are still fascinated by the process of inkjet printing, as described in the opening storyline for this chapter. you convince your father to take you to his manufacturing facility to see the machines that print expiration dates on eggs. you strike up a conversation with the technician operating the machine. he tells you that the ink drops are created using a piezoelectric crystal, acoustic waves, and the plateau-rayleigh instability, which creates uniform drops of mass m = 1.25 ✕ 10−8 g. while you don't understand the fancy words, you do recognize mass! the technician also tells you that the drops are charged to a controllable value of q and then projected vertically downward between parallel deflecting plates at a constant terminal speed of 20.0 m/s. the plates are ℓ = 2.15 cm long and have a uniform electric field of magnitude e = 6.40 ✕ 104 n/c between them. noting your interest in the process, the technician asks you, "if the position on the egg at which the drop is to be deposited requires that its deflection at the bottom end of the plates be 0.17 mm, what is the required charge on the drop (in c)? " you quickly get to work to find the answer. (neglect the force of gravity.)