How many moles of silver atoms are in 1.8 x 1020 atoms of silver?

Basalt with half live of 10 million years and 1/8 is remaining, how old is rock?

When Mario Molina and f. Sherwood Rowland first presented their findings about the threat of CFCs, the industrial chemists who developed CFCs scoffed at their warnings. They argued that CFCs were known to be very nonreactive.

What is the third most common gas found in the air we breath?

Cathode is zinc or copper

How to calculate wavelength

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?

1) Identify the intensive properties of a sample of matter: A. mass B. hardness C. color D. volume E. reflectivity

Suppose you have a buffer containing 0.400 M hydrazine and 0.300 M hydrazinium chloride at equilibrium. Then you add 25.2 g of NaOH to 2.0 L of the buffer. What change in pH is caused by the addition of the base? A) 0.99 B) 0.40 C) 8.71 D) - 0.36

The heart is an example of which level of organization within an organism? O cell organ tissue organ system O O