Why do scientists use atoms in the gas phase to measure ionization energies and electron affinities

What is recrystallization?

Determine the limiting reactant (LR) and the mass (in g) of nitrogen that can be formed from 50.0 g N 2O 4 and 45.0 g N 2H 4. Some possibly useful molar masses are as follows: N 2O 4 = 92.02 g/mol, N 2H 4 = 32.05 g/mol.

Which of the following utilizes the measurement of a short - or long-lived radioactive element, with its decay product, to determine the absolute age of an object? A. varves B. radiometric dating C. dendrochronology

What ions represent an acid? What ions represent a base?

Aqueous carbonic acid H2CL3decomposes into carbon dioxide gas and liquid water. Write a balanced chemical equation for this reaction.

Which of the follwing is a pure substance: sugar, salt, water, or pepper? Explain how you know.

A chemistry student needs of isopropenylbenzene for an experiment. She has available of a w/w solution of isopropenylbenzene in carbon tetrachloride. Calculate the mass of solution the student should use.

Can an organism carry out cellular respiration without photosynthesis?

Predict the product for PtCl4 + F2

Calculate the formula mass of ethanol, c2h5oh. express your answer to three significant figures and include the appropriate units.