Which one of the following is a balanced equation? A. 2Ca (s) + O2 (g) → 2CaO (s) B. 6Ca (s) + 2O2 (g) → 6CaO (s) C. 4Ca (s) + O2 (g) → 2CaO (s) D. 6Ca (s) + 4O2 (g) → 2CaO (s)

Automobile airbags inflate due to the formation of nitrogen gas from the chemical reaction 2NaN3 (s) - 3N2 (g) + 2Na (s) Identify the number of each atom in the reactants and products for this balanced reaction.

Which indicator would best distinguish between a solution with a pH of 3.5 and a solution with a pH of 5.5? (1) bromthymol blue (3) litmus (2) bromcresol green (4) thymol blue

In what type of rocks are most fossils found

A generator contains a coil that spin to produce an electric current how is energy transformed by using a generator

If the pressure on a gas is increased, then its volume will ... ?

Energy cannot be created or destroyed. Does the statement describe a scientific law?

Use the concept of natural selection to explain why organisms typically adapt over time.

You might separate a mixture of aniline, p-cresol, benzoic acid, and toluene using ordinary laboratory reagents. 1. dissolving the mixture in a water-immiscible organic solvent - NaHCO3, H2O, CH2Cl2 2.

A chemical element is a pure substance that consists entirely of one type of what

Calculate the mass percent composition of sulfur in Al2 (SO4) 3. Calculate the mass percent composition of sulfur in Al2 (SO4) 3. 28.12 % 42.73 % 35.97 % 9.372 % 21.38 %