Which of the following steps in a star's life cycle takes the longest?

A.

fusion of carbon atoms

B.

formation of a protostar

C.

fusion of hydrogen atoms

D.

fusion of helium atoms

Which element would you think is the best conductor of electricity? A. zinc (Zn) B. argon (Ar) C. silicon (Si) D. hydrogen (H)

Identify the name of the nuclear process that is primarily responsible for producing energy in stars

What is a process by which a gas changes to a liquid called?

How many moles are in 1.86•10^23 F atoms?

An antacid tablet added to a glass of water fizzes and bubbles as it mixes. Which of the indicators of a chemical change is represented in this scenario? A) formation of a precipitate B) change in energy C) formation of a gas D) change in color

The molar mass of water (H2O) is 18.02 g/mol. Yun needs 0.025 mol H2O for a laboratory experiment. She calculates that she needs 72.0 g H2O for the experiment. Yun's calculation was incorrect because she set up her unit conversion incorrectly.

I'm doing isotope homework and I need the find the number of protons, neutrons, and electrons first one is chromium-58 and chromium-63

Trisha and her lab partner were conducting a variety of experiments to produce gases: hydrogen, oxygen, and carbon dioxide. In one experiment, they added a piece of magnesium ribbon to 10 milliliters of hydrochloric acid.

what mass of magnesium is required to react with excess nitrogen to produce 0.500 mol magnesium nitrade

Silver chromate is sparingly soluble in aqueous solutions. the ksp of ag2cro4 is 1.12 * 10-12 m3. what is the solubility (in mol/l) of silver chromate