An ion of zinc, Zn, has 28 electrons, 30 protons and 33 neutrons. What is its mass number

Approximately when did the first plants and arthropods appear on land? A. 444 Ma B. 488 Ma C. 299 Ma D. 416 Ma

What is an endothermic reaction?

The harmonic law would suggest that Neptune will take how much time to orbit the Sun than Mercury?

If the solubility of a gas in water is 1.22 g/L at 2.75 atm, what is its solubility (in g/L) at 1.0 atm?

Using a handbook, look up up the formula and structure of potassium hydrogen phthalate (khp) used to standardize the solution of naoh in this experiment. calculate the molar mass of kph.

You have a fixed container with a volume of 5.00l that contains 35.0 g nitrogen gas (n2). if the temperature is 298 k, calculate the pressure in the container. r = 0.0821 l atm / mol k

If a bottle of olive oil contains 1.3 kg of oil what is the volume in mL of the oil?

How to find an elements atomic weight

Be sure to answer all parts. Find the pH during the titration of 20.00 mL of 0.1000 M triethylamine, (CH3CH2) 3N (Kb = 5.2 * 10-4), with 0.1000 M HCl solution after the following additions of titrant. (a) 11.00 mL: pH = (b) 20.60 mL: pH = (c) 25.

An atom of sulfur is represented by 3316s. how many neutrons are in the nucleus of this atom? express your answer as an integer.