When an atom gives off energy in the form of light, a. it becomes excited. b. it becomes more stable. c. it returns to ground state. d. both b & c e. none of the above.

A 25.0 ml sample of water at 90 °c has a mass of 24.12 g. Calculate the density of water at this temperature.

Determine the mass of 2.4 x 10^24 atoms of gold?

If you have 3.0 liters of an unknown gas, at standard temperature and pressure conditions, then you can calculate what about that gas?

In order for plants to go through photosynthesis, they must use A. X rays. B. visible light. C. infrared rays. D. ultraviolet light.

How do I find the molar mass of Copper (II) Nitrate?

Draw the correct structural formula for the following compounds: (be sure to include the hydrogen atoms where required) a) 2-pentene b) 2,3-diethyl-3,5-dimethylhexane c) 4-ethyl-2,6-dimethyl-2-heptene

Letters B and C on this model show us daytime on Earth. Both locations have daytime because of A) Earth's tilt on its axis. B) Earth's orbit around the sun. C) Earth's rotation on its axis. D) Earth's distance from the sun.

Blanking and Punching size:A compound die will be used to blank and punch a large washer out of 6061ST aluminum alloy sheet stock 3.80 mm thick. The outside diameter of the washer is 60.0 mm and the inside diameter is 28.0 mm.

Whats the difference between china and Europe

Iodine pentafluoride gas reacts with iodine fluoride gas producing iodine heptafluoride gas and iodine gas. What is the maximum number of grams of iodine gas that can be produced from a reaction of 10.0 g of iodine pentafluoride with 11.