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

815 cal of heat is added to 5.00 g ice at - 20.0 °C. What is the final temperature of the water?

Which chemical equation represents a redox reaction? A. Mg (ClO3) 2 + 2HCl → MgCl2 + 2HClO3 B. CO + H2O → H2 + CO2 C. 2NH4NO3 + CuCl2 → 2NH4Cl + Cu (NO3) 2 D. Na2SO3 + FeBr2 → 2NaBr + FeSO3

What is the max amount of Cu that would be produced by reacting 20g of Al with excess CuSO4

Calculate the percentage by mass of carbon CO2

How natural selection can lead to evolution

Compared to the radius of a chlorine atom, the radius of a chloride ion is (1) larger because chlorine loses an electron (2) larger because chlorine gains an electron (3) smaller because chlorine loses an electron (4) smaller because chlorine gains

What do you think made the blizzard so dangerous?

If 6 moles of a compound produce 84 J of energy, what is the a Hreaction in J/mol?

If you were traveling through space and landed on a different planet, how might your mass and weight compare to their values on Earth? Why?

Which principle explains why it is necessary to have safety belts in cars?