4Fe + 3O2à 2Fe2O3 is a balanced equation. What is the charge on each iron (Fe) ion in hematite (Fe2O3) ?

A. + 1

B. + 2

C. + 3

D. + 4

The pressure and temperature inside a bike tires 10 ATM and 10 K receptively. What will the pressure be come in the tire when the temperature is increased to 20 K

The average adult exhales about 1.0 kg of carbon dioxide each day. How much oxygen is needed in metabolizing glucose (C6H12O6, 180 g/mol) to make that much carbon dioxide?

An element a combines with fluorine to form an ionic compound having the formula af3. what is the formula of the ionic compound formed between iodine and a?

At which temperature will the least amount of time pass before someone detects the odor of a fragrant flower?

When two or more different atoms combine they form what?

How many particles are in 3.55 moles of Aluminum Sulfate

Major geological events that occur when plates shift suddenly and released stored energy: A. Volcanic eruptions B. Earthquakes C. Antarctic plate D. Spreading ridges

How does a salt bridge improve a battery

Hat information is needed to determine the energy of an electron in a many-electron atom?

Write the formulas for the following compounds: (a) copper (l) cyanide, (b) strontium chlorite, (c) perbromic acid, (d) hydroiodic acid, (e) disodium ammonium phosphate, (f) potassium dihydrogen phosphate, (g) iodine heptafluoride, (h)