The tilt of the Earth's axis of rotation is responsible for the A) ocean's tides. B) size of the Moon. C) brightness of stars. D) Earth's seasons.

How much of a sample of radio-isotope remais after one half life?

Which element has the greatest electronegativity? N P As

Which of the following is the best definition of thermal energy? A. The energy associated with the random motion of molecules or atoms within substances. B. The energy that is stored in a substance due to its position or configuration. C.

A change in heat whether endothermic or exothermic is always a clear indication of a chemical change true or false?

Describe the difference between chronic and acute exposure.

What is unique about the way that transition metals form compounds? a. They don't form compounds c. They can form bonds with the electrons in the two outer-most shells b. They are the most reactive d. They can donate all of their electrons

What prompted rutherford to do the alpha particle scattering experiment?

How many moles of hydrogen would be required to produce 5.0 mol of water?

What is the biggest difference between an exothermic and endothermic process? A. The direction of energy flow. B. The amount of energy transferred. C. The type of energy being transferred. D. The speed with which energy is transferred.

The mass of 1 mol of chromium (atomic mass 51.996 amu) is