Uranium-235 has a half-life of 713 million years, while carbon-14 has a half-life of about 5,730 years. Which isotope would be more useful for dating a fossil from Precambrian time?

Calculate the density of chlorine gas in g/l, at stp. a. 0.32 g/l b. 0.63 g/l c. 1.6 g/l d. 2.9 g/l e. 3.2 g/l

Calculate the percent yield for the reaction above if 25.0 grams of H2SO4 was actually produced and the theoretical yield was predicted to be 42.0 grams. (% yield = Actual / theoretical x 100) SO3 (g) + H200 H2SO4 (9) O 59.5 O 168 O 0.595 O 1.68

Gabriela read in the newspaper that the amount of carbon in the atmosphere is increasing and that humans are responsible. She said, "If carbon in the atmosphere is increasing, the total amount of carbon on Earth must also be increasing."

What evidence led scientists to develop the theory of plate tectonics

Naoh is a strong electrolyte, and ch3oh is a nonelectrolyte. how is the solution of naoh different from that of ch3oh?

12.23 g of ammonia (NH3) are dissolved in enough water to make 560.0 mL of solution. How many moles of NH3 are added to the water?

According to the ph scale, what is the approximate ph of acid rain? a. 4.0 b. 4.5 c. 5.0 d. 5.5

You find a little bit (0.150g) of a chemical marked Tri-Nitro-Toluene, and upon combusting it in oxygen, collect 0.204 g of CO2 and 0.030 g H2O (we'll assume that these are the products, along with nitrogen).

What reaction occurs when two amino acids are put together?

A chemical reaction takes place inside a flask submerged in a water bath. The water bath contains of water at. During the reaction of heat flows out of the bath and into the flask. Calculate the new temperature of the water bath.