What is Loschmidt's number? How is it related to Avogadro's number?

What is the number of electrons in the highest occupied energy level of an element in Group 5A? a. 5 b. 3 c. 8 d. 18

A football field is about 10000 cm long. If it takes a person 20 seconds to run its length, how fast was the football player running?

What is the name for a large body of air that has a certain temperature and a amount of moisture

Calculate the wavelength of an electron (m = 9.11 x 10-28 g) moving at 3.66 x 106 m/s. a. 1.99 x 10-10 m b. 5.03 x 10-10 m c. 1.81 x 10-10 m d. 5.52 x 10-9 m e. 2.76 x 10-9 m

In the wave-mechanical model of the atom, orbitals are regions of the most probable locations of (1) protons (3) neutrons (2) positrons (4) electrons

Suppose you find a rock that contains some potassium-40 (half-life of 1.3 billion years). you measure the amount and determine that there are 5 grams of potassium-40 in the rock.

What are some positive and negative effects of the production of maple syrup on society and the environment?

Describe and give an example of parasitism.

Why is a dilute solution of oleic acid used instead of pure oleic acid?

The vapor pressure of benzene (C6H6) is 73.0 mm Hg at 25 °C. What is the vapor pressure of a solution consisting of 179 g of benzene and 0.217 mol of a nonvolatile nonelectrolyte?