Which formula represents a polar molecule?

(1) O2

(2) CO2

(3) NH3

(4) CH4

1. Where are people in the shrimp food chain? A. Close to the very bottom B. About in the middle C. Close to the top D. At the very top

Explain how a cell is like your school or town. What is the nucleus of your town? The mitochondria?

In the laboratory you are given the task of separating Ag + and Cu2 + ions in aqueous solution. For each reagent listed below indicate if it can be used to separate the ions. Type "Y" for yes or "N" for no.

Which of the following are also major levels of classification? Choose all answers that are correct. A. Genus B. Species C. Group

A brown solid element conducts electricity well. Is it a metal or non-metal?

A lunar eclipse can only occur at which lunar phase? And what about a solar eclipse?

Where are the transition metals on the periodic table? A. In two rows, separated from the rest of the table B. In the second column C. In the first column D. In columns 3 - 12 in the center of the table

A spherical ball of lead has a diameter of 2.5 cm. What is the mass of the sphere if lead has a density of 11.34 g/cm3? (The volume of a sphere is (43) πr3 where r is the radius.)

If a clot were made up of a mass of proteins, what change in the proteins led to the formation of a clot?

How many types of eggs can mothers create