The shape of a molecule is tetrahedral. How many lone pairs are most likely on the central atom?

zero

two

three

four

What is the process in which an unstable atomic nucleus emits charged particles or energy or both? a. radioactivity b. oxidation c. decomposition d. none of the above

An organic compound that contains a nitrogen atom bonded to one, two, or three different carbon atoms is a (n) ether. amine. ester. ketone

Abby mixes 2 moles hydrogen with 1 mole oxygen to produce water. She expects to produce 2 moles water, but she captures 1.5 moles water. In this case, the value 1.5 moles represents which type of yield?

Express as an ordinary number. 3.85 x 10^-3

Most of our DNA consists of regions that do not code for any proteins True or False

What two elements make up dihydrogen monoxide?

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.