Which equation obeys the law of conservation of mass?

2Fe + 3O2 → 2Fe2O3

4Fe + O2 → 2Fe2O3

Fe + O2 → Fe2O2

4Fe + 3O2 → 2Fe2O3

Which component is an example of scientific law? A. All objects attract other. B. Radium is a radioactive element. C. What goes up always comes back down. D. Gravity is a dent in the fabric of space and time.

Calculate the volumeof 1.0M NaOH necessary to completely neutralize 100mL of 0.50M of phosphoric acid (H3PO4) ?

Give the number of significant figures: 0.01101 cm

Which force determines Earth's path around the Sun? A) nuclear force B) magnetic force C) gravitational force D) electrostatic force

Which pair of atoms is most likely to be covalently bonded? 1) Na and O 2) K and F 3) Ne and O 4) C and S

25 In general, for a gas at a constant pressure, A the temperature of the gas is inversely proportional to its volume B. the temperature of the gas is inversely proportional to its pressure C.

The vapor pressure of ethanol is 54.68 mm Hg at 25 °C. A nonvolatile, nonelectrolyte that dissolves in ethanol is saccharin. Calculate the vapor pressure of the solution at 25 °C when 8.054 grams of saccharin, C7H5NO3S (183.

What do microscopic producers supply the atmosphere with?

A particular form of electromagnetic radiation has a frequency of 8.11 x 10^14 hz. What is the energy in joules of one quantum of this radiation?

Which transition elements in the first transition series have anomalous electron configurations?