How many atoms of phosphorus are represented by one formula unit of calcium phosphate?

A. 3

B. 6

C. 9

D. 12

E. 18

What is formed when water chemically combines with carbon dioxide

Which best explains what happens when an electron moves from an excited state to the ground state? The electron absorbs energy as it moves to a lower energy level. The electron absorbs energy as it moves to a higher energy level.

What is the independent variable?

Helium (He), oxygen (O), carbon (C), and selenium (Se) are all nonmetal. Using the periodic table, which pair of these nonmetal has the most similar properties

What is the major difference between the periodic table created by Dmitri Mendeleev and the one created by Henry Moseley?

2. An object experiences an acceleration, g, when it is on the surface of a planet of radius R. What will be the acceleration on the object after it has been moved to a distance of 4R from the center of the planet? A) 168 B) 48 C) 1/4 g D) 1/16 g

For a successful TLC experiment, you need to pay attention to the details. From the list of instructions and tips below, select the detail that is NOT important to a TLC experiment. O O Do not disturb the developing chamber.

The word atom means invisible?

A pycnometer weighs 25.60 g empty and 35.55 g when filled with water at 20°C. The density of water at 20°C is 0.9982 g/ml. When 10.20 g lead is placed in the pycnometer and the pycnometer is again filled with water at 20°C, the total mass is 44.83 g.

How does weathering affect the surface area of a rock? Explain your answer.