Explain how you can tell when a change is a chemical change.

The isotope of an atom containing31 protons and 39 neutrons suddenly has two neutrons added to it what isotope is created

5. Given the reaction: 2 H2 + O2 + 2 H2O The total number of grams of O2 needed to produce 54 grams of water is 48

How many grams of al2br6 can be produced from 1278.4 g of br2 and 107.9g of al?

Indicate the type of hybrid orbitals used by the central atom in BrF3. A) sp B) sp3d C) sp3 D) sp2 E) sp3d2

Which has the greatest half life, carbon-14, potassium-40, or uranium-238

If atmospheric pressure suddenly changes from 1.00 atm to 0.892 atm at 298 k, how much oxygen will be released from 4.40 l of water in an unsealed container?

Determine the molecular formula for the unknown if the molecular mass is 60.0 amu and the empirical formula is ch2o.

Draw the organic product of the following nucleophilic reaction

How does the energy of the activated complex compare with the energies of reactants and products? select one: a. it is lower than the energy of both reactants and products. b.

A student asked to convert measurements from liters to mililiters and from mililiters to liters. His answers are shown in bold in the choices shown below. On which choice did he make a mistake?