What percentage do the elements hydrogen and helium account for in the universe? A. 100% B. 99.9% C. 98% D. 99.8%

Rubber, plastic, and asphalt are examples of

Which statement about a reaction is not correct? A. The free energy of a reaction depends on the amount and direction of entropy and heat changes. B. If a reaction is exothermic and increases entropy, then the reaction is spontaneous. C.

Hydrogen gas is explosive within the range of 4% - 75% v/v. Assuming that each student in your class produces 6 L of H2 and that the lab is not ventilated, is there danger of an explosion. Show your calculations to back up your answers.

If you walk on a log that is floating in the water, the log moves backward what law

What is the molar mass of Fe2O3? 71.84 g/mole 76.00 g/mole 159.7 g/mole 431.0 g/mole

Consider the formation of glucose from carbon dioxide and water, that is the reaction of the photosynthesis process:

Is the animal farm poor true or false

Which list correctly shows carbohydrates in size from smallest to largest?

Metallic behavior is generally associated with elements with partially filled p orbitals. elements with unpaired electrons. elements with small atomic radii. elements with very negative electron affinities. elements with low ionization energies.

Does cos have a dipole moment? choose the answer that best explains the reason for your choice.