A large area in a semi-dry climate has been greatly affected by a decrease in rainfall over the last several years. This area is in danger of

Oxidation Number of fe in fe3o4

The amount of heat involved in the synthesis of 1 mole of a compound from its elements with all substances in their standard states at 25 degrees celcius is called

What type of air pollutant is produced in smoke from a fire? a. Chemical pollutant b. Cumulative pollutant c. Primary pollutant d. Secondary pollutant

A mixture of helium and krypton gases at a total pressure of 904 mm hg contains helium at a partial pressure of 718 mm hg. if the gas mixture contains 0.777 grams of helium, how many grams of krypton are present?

Calculate the molecular mass of carbon dioxide (CO2) :

Which of these is an acid A (Vinegar

How are RNA and DNA used to make proteins? A-RNA has coded instructions for making proteins, and DNA translates the code. B-DNA forms the monomers that make up RNA, and RNA forms the monomers that make up proteins.

The organic compound aldehyde contains which functional group? amide carbonyl carboxyl hydroxyl

Which astronomer supported the belief that earth was at the center of the universe while all other planets and celestial objects orbited around it

When a solution of LiC2H3O2 reacts with a solution of MgSO4, what is the net ionic equation? No reaction Mg+2 (aq) + C2H3O2 - (aq) → Mg (C2H3O2) 2 (s) Mg+2 (aq) + 2C2H3O2 - (aq) → Mg (C2H3O2) 2 (s) 2Li + (aq) + SO4-2 (aq) → Li2SO4 (s)