In the following reaction: 4 Al + 3 O2 - > 2 Al2O3 How many moles of aluminum would be needed to completely react with 90 grams of O2?

Burning coal produces what type of gas? oxygen hydrogen carbon dioxide nitrogen

The ksp of zinc carbonate (znco3 is 1.0 * 10-10. what is the solubility concentration of carbonate ions in a saturated solution at 25°c? 1.4 * 10-5m 7.1 * 10-6m 1.7 * 10-5m 1.0 * 10-5m

A covalent bond in which electrons are shared unequally is a. polar. b. a double bond. c. ionic. d. polyatomic.

1 unit change in ph is?

En que consiste cada familia de la tabla periódica?

Which of the following is not true of science? 1. Science offers proof of a claim 2. Science is a way of knowing 3. Science is a process 4. Science provides support or fails to provide support to claim

What happens to the velocity of a sound wave in air if the temperature of the air increases

Determine the [oh-] concentration of a 0.741 m koh solution at 25°c.

In the lab, students decomposed a sample of calcium carbonate by heating it over a Bunsen burner and collected carbon dioxide according to the following equation: CaCO3 (s) CaO (s) CO2 (g) (a) How many mL of carbon dioxide gas were generated by the

J. J. Thomson A) Electrons are in orbital levels. John Dalton B) Atoms are the smallest unit of an element. Ernest Rutherford C) Electrons are scattered within the atom. Niels Bohr D) Protons are at the center of an atom.