What do geologists use index fossils for?

A. dating of rock layers

B. identifying the type of rock in a rock layer

C. providing evidence of climate change

D. tracking migration of prehistoric species

What is the oxidation number of O in PO4^3-? A. 0 B. - 1 C. - 2 D. - 3 E. None Of The Above

C. If 62.9 g of lead (II) chloride is produced, how many grams of lead (II) nitrate were reacted?

In order to use the value 22.4 L for molar volume in a mass-volume or volume-mass stoichiometry problem, the gas must be assumed to be at STP. A. True B. False

How many moles of water form when one mole of NH3 reacts according to this reaction 4 NH3 + 5 O2 = 4NO + 6 H20

A 33.17-g sample of a solid is placed in a flask. A liquid, in which the solid is insoluble, is added to the flask. The total volume of the solid and the liquid is 50.00 cm^3. The total mass is 59.68 g. The density of the liquid is 0.864 g/mL.

How many moles of CO will be produced, if 32.5grams of H2O are produced? C6H6S+6O2=>6CO+3H2O+SO3

Identify and briefly describe two ecosystems in your community that are beyond schoolyard

Is N2H2 a ionic compound?

What do Lewis dot structures show?

300 grams of a compound which contains only carbon, hydrogen and oxygen is analyzed and found to contain the exact same percentage of carbon as it has oxygen. The percentage of hydrogen is known to be 5.98823%.