Which chemical symbol describes an element?

How many moles are there in 2.00 x 10^19 molecules of CCl4

An atom of a fictional element has the energy level diagram shown below. Which line will not appear on the total emission spectrum? Energy level diagram A. 0.9 eV B. 0.8 eV C. 0.7 eV D. 0.6 eV

C3H2 + 502 + 3 CO2 + 4H20 6) Determine the number of moles of water produced from 1.55 moles of propane (CH3).

Hat happens when an atom gains an electron? a. it becomes a negative ion. b. it has an increase in the number of protons. c. it becomes a positive ion. d. it has an increase in the number of neutrons.

Cindy made tea. She started with 300 grams of water at 20 degrees Celsius. She transferred 18,000 calories to the water. What was the final temperature of the water?

The water level in a graduated cylinder stands at 20.0 ml before and at 26.2 ml after a 16.74 g metal sample is lowered into the cylinder. what is the density of the sample. what metal is the sample most likely to be

What are the tube feet on a star fish

What kingdom is humans in!

Propane (C3H8) has a molar mass of 132 g/mole. You started out the day with a tank containing 9071 g of propane. At the end of the day, your tank contained 7532 g of propane gas. How many moles of gas did you use?

Why decomposition of ammonium nitrate is a redox reaction?