How old is Earth according to the geological time scale?

A. 290 million years old

B. 542 million years old

C. 2.5 billion years old

D. 4.6 billion years old

A sample of a white solid contains 0.212 g of magnesium and 0.140 g oxygen. What is the empirical formula of this compound?

Why do Hurricanes not form directly on the equator?

If you have 3.64 g of H2, how many grams of NH3 can be produced

Balance the equation below, and answer the following question: What volume of chlorine gas, measured at STP; is needed to complete the reaction with 6.25g of sodium metal

Which of these provides evidence that a chemical reaction occurs?

The three major groups p On the periodic table are the

Which of the following has the greatest mass, in grams? a. 1 atom of lead (Pb) b. 0.5 mol copper (Cu) atoms c. 0.3 mol gold (Au) atoms d. 25 atoms of mercury (Hg)

Which one is not a sedimentery rock a.) sandstone b.) limestone c.) quartz d. (coal

Which group is more reactive than the alkaline earth metals?

Why do you not want any of the water on the outside of the test tube to drip off into the calorimeter?