How many moles are in 345g of Re

Nitrogen dioxide gas is obtained by the reaction of nitrogen monoxide gas and oxygen gas. Write a balanced chemical equation for this reaction?

Which of the following processes has an increase in entropy? A) Boiling a pot of water B) Freezing a sample of water C) Filtering sand out of a sample of water D) Synthesizing water from hydrogen and oxygen

The mass, on grams, of a molecule of aspirin. (C9H804) Show your work.

What is the charge of copper on the reactant side? What is the charge of the copper ions on the product side? Was the copper oxidized or reduced? By what number of electrons? Equation: Cu + 4HNO3 - - > Cu (NO3) 2 + N204 + 2H20

ionic compounds tend to form between metals and nonmetals when electrons are transferred from an element with high ionization energy (metal) to an element with a low electron affinity (nonmetal). a. true b. false

Why did most scientists reject Wegner's theory for nearly a half century?

Define prediction and explain how it is used to formulate a hypothesis.

A group of organisms that breed and produce offspring that can breed. A. Species B. ecosystem C. Biodiversity

What is the molality of a solution containing 100 grams of glucose (C6H12O6, molar mass = 180 g/mol) dissolved in 2.5 kg of water? 0.22 m 72 m 7200 m 40 m

A battery is constructed based on the oxidation of magnesium and the reduction of cu2+. the initial concentrations of mg2 + and cu2 + are 1.2*10-4 m and 1.44 m, respectively, in 1.0-liter half-cells. how long can the battery deliver 5.