How many valence electrons does a fluorine atom contain?

a. 2

b. 5

c. 7

d. 9

How many moles of carbon are in 90g of glucose (C6H12O6) ? Assume that the molar mass of glucose is 180g/mol.

Threats faced by the Everglades and the Louisiana wetlands.

What is 45,000 written in scientific notation? 4.5 * 104 4.5 * 105 4.5 * 103 4.5 * 102

A substance that is not soluble in a polar solvent is

The bright-line spectrum of sodium is produced when energy is (1) absorbed as electrons move from higher to lower electron shells (2) absorbed as electrons move from lower to higher electron shells (3) released as electrons move from higher to lower

A scientist discovers a new type of polymer. What must be true about this polymer? A. It contains carbon atoms arranged in a ring structure. B. It has double bonds between all the carbon atoms. C. It contains molecules of many different types. D.

A line in the lyman series of hydrogen has a wavelength of 122 nm. from what state did the electron originate?

What are the products of photosynthesis? A. Glucose and oxygen B. Oxygen, solar energy, and glucose C. Carbon dioxide, water, and solar energy D. Hydrogen, oxygen, and carbon

A sample of a substance that has a density of 0.824 g/mL has a mass of 0.421 g. Calculate the volume of the sample.

The tyndall effect is used to detect A: suspensions B:liquid solitions C:tyndalls D:colloida