Which of the following is used as evidence that the universe begin with the Big Bang

A. Leftover energy in the universe from the event

B. The existence of Atoms

C. The force of gravity

D. Craters on the moon

What is the mass, in grams, of 8 mol of 12c?

Select all that apply. what intermolecular forces stabilize a lipid bilayer?

Define the term acid

The reaction N2 + 3 H2 → 2 NH3 is used to produce ammonia. When 450. g of hydrogen was reacted with nitrogen, 1575 g of ammonia were actually produced. What is the percent yield of this reaction? a. 20,7% b. 41,5% c. 62,1% d. 30,8% e.

For the nitrogen fixation reaction, 3h2 (g) + n2 (g) 2nh3 (g), kc = 6.0 * 10-2 at 500°c. if 0.250 m h2 and 0.050 m nh3 are present at equilibrium, what is the equilibrium concentration of n2? a. 3.3 m b. 2.7 m c. 0.20 m d. 0.083 m e. 0.058 m

How much of a 15.0M stock solution do you need to prepare 250ml of a 2.35ml hf solution?

A synonym for dwindled

A material that cannot be broken down farther by chemical means

How many of the following elements have 2 unpaired electrons in the ground state? C Te Hf Si A) 1. B) 2. C) 3. D) 4.

Which has a higher frequency, a neutron or electron? Why?