ammonia (NH3 (g) Hf=-45.9 kJ/mol) reacts. with oxygen to produce nitrogen and water (H2O (g) Hf = - 241.8 kJ/mol according to the equation below. 4NH3 (g) + 3O2 (g) - --> 2N2 (g) + 6H2O (g) what is the enthalpy of the reaction

List and describe the three rock types in the rock cycle including two or more processes involved in the formation of each type

An unknown solution has an h + concentration of 10-12 moles per liter. which of the following statements correctly describes this solution? select one of the options below as your answer: a. the solution is basic in nature. b.

True or false? When sodium and chlorine combine and bond, a molecule is formed.

Which of the following is not a statement of Dalton's atomic theory of matter? a. Elements are made of atomsb. Atoms of a given element are identicalc. The atoms of one element can be identical to the atoms of another elementd.

What do chloroplasts do

What astronomical equiptment did hypatia use?

Name each activity or observation as either physical or chemical change. 1) Boiling water for pasta 2) Digesting food 3) Soda goes "flat" 4) Stretching a rubber band 5) Grilling a hamburger 6) Adding sugar to tea 7) Adding lemon to tea 8) Mowing the

Ironing a shirt is an example of ... convection conduction radiation condensation

Which compound conducts electricity only in the molten state? A. sodium bromide B. calcium hydroxide C. barium sulfate D. magnesium sulfate

What is going to happen to a balloon filled with helium that is left in a car over night when the temperature drops approximately 20 degrees