Which formula represents an ionic compound?

(1) H2 (3) CH3OH

(2) CH4 (4) NH4Cl

One parsec equals 3.26 light years, where a light year is the distance light travels in one year. if the speed of light is 186000 mi/s, how many parsecs does it take for light to reach Mars from Earth, which is 60 million kilometers away? (1 km = 0.

Describe two reasons why an alpha particle is less penetrating than a beta or gamma particle.

Earnshaw's theorem (Prob. 3.2) says that you cannot trap a charged particle in an electrostatic field. Question: Could you trap a neutral (but polarizable) atom in an electrostatic field?

You sealed an Erlenmeyer flask that was determined to have a volume of 272.2 mL with a stopper. The density of air at 25°C is 0.001185 g/mL. Air has an effective molar mass of 28.96 g/mol. What amount of air was sealed in the flask?

A sample of gas has a volume of 12,000 ml and a pressure of 1.00 atm. If the pressure of gas is increased to 2.00 atm, What is the new volume of gas?

If a fast moving car making a loud noise approaches and moves past the person what will happen as the distance between the two increases?

Which of the following would be an example of a trophic relationship? Select all that apply. photosynthetic plankton respiring oxygen into the ocean small marine life feeding on the algae and plankton that have descended to the ocean floor a

Fumaric acid is an organic compound composed of 41.39%, 3.47%, and the rest oxygen. If 0.288 mol of fumaric acid has a mass of 33.4 g, what are the empirical and molecular fomulas of fumaric acid

What is an isotope? Give an example of an element with isotopes.

Consider the reaction between liquid water and aqueous magnesium nitride to form solid magnesium oxide and ammonia gas. If magnesium nitride is present in excess, how many moles of water are needed to form 9.17*1023 ammonia molecules?