If you weigh 131 grams of calcium chloride, CaCl2, how many moles do you have?

Perform the following mathematical operations and report the answer to the appropriate number of significant figures 5.87998 + 3.100

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line