Which of the following equations is balanced?

2H2 + O2 → 4H2O

4Na + O2 → 2Na2O

Fe2O3 + H2 → 2Fe + 3H2O

CH4 + O2 → CO2 + H2O

Is cr2o3 a molecular or ionic compound?

What is the mass of 1 mole of lithium? 6.94 grams 0.432 grams 3.0 grams 2.31 grams

What mass of precipitate will be produced from the reaction of 50.0 mL of 2.50 mol/L sodium hydroxide with an excess of zinc chloride solution. Show your work

Acid precipitation can be traced back to the burning of fossil fuels. a. True b. False

A 180 ml volume of gas is measured at 87 degrees Celsius. if the pressure remains unchanged, what will be the volume of the gas at standard temperature

Balance the following redox equation in acidic solution using the smallest integers possible and select the correct coefficient for the H + (aq) ion.

Toussaint L' ouveeture lead a revolt that eventually resulted in Independence for

If a solution contains 1 x 106 hb molecules, how many o2 binding sites are available? if the solution of hb is 50% saturated with o2, how many binding sites are occupied by o2?

A. what are isotopes? b. how are the isotopes of a particular element alike? c. how are they different?

The line of longitude used as the origin in a system of coordinates