How many valence electrons are in a silicon atom?

What is it called when Light changes direction and slows down when it enters water from air.

If you have 3.8 x 10^24 molecules of O2 at STP how many liters of O2 do you have? Show all work for credit.

for any substance solid liquid or gas mass increases as volume increases because density represnets mass per volume

Which of the following best describes good autobiographies? a. revealing b. lengthy c. rambling d. fictional

Burning gas on a stovetop transforms chemical energy into what other types of energy?

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.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2