How many lenses are found in the simplest telescopes?

one

two

three

four

What is the volume of a 200. gram sample of gold if its density is known to be 20.5 g/cm3?

What is one of the primary unanswered questions about the origin of the universe? What type of elements formed first? Approximately how long ago did the big bang occur? How long did it take the earth to form? What came before the big bang?

I know this is a very broad question but can someone explain ions, I am so confused.

2. Which electron dot structure represents a nonpolar molecule? a. H:0 H c. H:: d. H:C:C:F b. cici:

Use the periodic table to calculate the molar mass of each compound below

Which statement is true according to the kinetic theory? 1. Moles of different gases with the same mas and temperature always have the same average density. 2.

A substance with a pH of 9 has A) no H30 + ions or OH - ions. B) more H30 + ions than OH - ions. C) more OH - ions than H30 + ions. D) the same number of H30 + ions as it does OH - ions.

Consider the following quantities used in thermodynamics: E, H, q, w, S, G. How many of them are state functions? a. 2 b. 0 c. 3 d. 1 e. 4

What are some good problem statements

A 5.00L reaction vessel is filled with 1.00mol of H2, 1.00mol of I2, and 2.50mol of HI. If equilibrium constant for the reaction is 129 at 500k, what are the equilibrium concentrations of all species?