7. The model of the universe that suggests that the sun is the center of the universe was first brought by

A. Brahe.

B. Ptolemy.

C. Copernicus.

D. Kepler.

Explain in terms of both electrons and energy how the bright line spectrum of an element is produced

Ice melts into water. The correct equation to calculate the heat of this reaction is ... O q=MCAT O q=mAHV O q=mAHE O q=mc^2

What is a neutralisation reaction?

You have just performed a laboratory activity where a lot of chemical waste was produced. all of the chemical wastes should be a. taken home. b. dumped down the sink. c. left at the lab for the next class to handle. d.

Given the lattice energy of kcl = 699 kj/mol, the ionization energy of k = 419 kj/mol and the electron affinity of cl = - 349 kj/mol, calculate the δh o for the reaction: k (g) + cl (g) → kcl (s)

Lewis base is a (n) a. producer of OH ions. b. proton acceptor. c. electron-pair donor. d. electron-pair acceptor. In the reaction represented by the equation Ag (aq) + 2NH3 (aq) - [Ag[ a. Bronsted-Lowry acid. b. Lewis acid

What is the main reason cells are replaced in the body? A The cells are too large. B The cells are inactive. C The cells are damaged. D The cells are cancerous.

There are six elements in Group 14 on the Periodic Table. One of these elements has the symbol Uuq, which is a temporary, systematic symbol. This element is now known as flerovium. 66 Identify an element in Group 14 that is classified as a metalloid.

Mathematical relationship between the rate of a chemical reaction and the concentration of reactants? Specific Rate Constant Collision Theory Rate Law Activation energy

How does the strength of a liquid's intermolecular forces affect its viscosity