An element's atomic number is 65. How many protons would an atom of this element have?

What is the equilibrium vapor pressure of a liquid and how is it measured

Energy is released when the atoms of two elements bond together to form a compound compared to the total potential energy of atoms before bonding the total potental energy of the atoms after bonding is

A sample of 0.0200 mol of chlorine gas is kept at 27.0°c and 0.150 atm. what would be its pressure if the temperature was increased to 227.°c and the volume kept the same

You have 200 g of a substance with a molar mass of 150 g/mol. How many moles of the substance do you have?

Make a general statement of how substances in a mixture can be separated

1. Crystals of ammonium chloride, NH4Cl, seem to disappear when mixed with water. The resulting clear liquid containing ammonium chloride and water is a A) compound. B) new substance. C) homogeneous mixture. D) heterogeneous mixture. 2.

During a laboratory experiment you discover that an enzyme-catalyzed reaction has a delta G of - 20 kcal/mol. If you double the amount of enzyme in the reaction, what will be the delta G for the new reaction

A liquid mixture in which particles can be seen and easily separated by settling or filtration is a a. solution. b. suspension. c. solvent. d. solute.

Which material best absorbs sound waves in a room? a. heavy curtains b. hardwood floors c. brick walls d. cement floors

Does density of water depend on the amount of water present?