Caffeine contains hydrogen, carbon, nitrogen, and oxygen atoms in a fixed ratio. is it a mixture or compund

What was used to determine the charge of an electron

How does a hypotonic solution affect a red blood cell? How does it affect a gram positive bacterial cell?

A mixture of xenon and carbon dioxide gases is maintained in a 5.33 l flask at a pressure of 2.20 atm and a temperature of 67 c. if the gas mixture contains 19.3 grams of xenon the number of grams of carbon dioxide in the mixture is

Calculate the volume in liters of a 0.360 mol/l barium acetate solution that contains 100. g of barium acetate (Ba (C2H3O2) 2). Round your answer to 3 significant digits.

Consider 4NH3 (g) + 5O2 (g) 4NO (g) + 6H2O (g). Delta H=-904.4 kJ. How does each of the following changes affect the yield of NO at equilibrium?

How do you know if the reaction is exothermic or endothermic if both phase are same?

How many elements are in a set whole numbers between 3 and 15

Calculate the percent activity of the radioactive isotope strontium-89 remaining after 5 half-lives.

Describe 2 theories for yawning

When a bimetallic bar made of copper and iron strips is heated, the bar bends toward the iron strip. the reason for this is?