List four clues that suggest a chemical change is taking place, and provide an example for each.

Ethane, a minority component of natural gas, burns to form carbon dioxide and water according to this reaction: 2H3C-CH3 (g) + 7O2 (g) →4CO2 (g) + 6H2O (g) Note that the average bond energy for the breaking of a bond in CO2 is 799 kJ/mol.

What smell may be a sign that cockroaches are present?

36) determine the kinds of intermolecular forces that are present in each element or compound. a. k b. ncl3 c. sih4 d. hf

Describe what happens to both the potential energy and the average kinetic energy of the molecules in the H2O sample during interval AB

Nitric acid is a key industrial chemical, largely used to make fertilizers and explosives. The first step in its synthesis is the oxidation of ammonia.

What 3 factors affect precipitation of a region

49. (3pts) A student calculated the volume of a 2.71 mol sample of helium at 450 torr and 35 °C. The student solved the problem using the ideal gas law as shown below: (450 torr) (V) = (2.71mol) (0.

The kilogram is the standard unit of

Why is useful to use moles to measure chemical quantities

In photosynthesis what form of energy is sunlight converted to