What is the importance of carbon

Which best explains how heat plays a role in the movement of materials within Earth's interior? Hot material near Earth's surface is more dense and sinks, and when it cools, it becomes less dense and rises.

How properties before and after a chemical reaction can be used to determine if a chemical reaction occurred

Avogadro defined one mole of carbon-12 atoms to have a mass of exactly 12.0 grams. Calculate the number of hydrogen atoms in 1 mole. A) 1.38 x 1025 atoms B) 1.66 x 1024 atoms C) 3.98 x 1023 atoms D) 6.02 x 1023 atoms

The 1996 Nobel Prize in Physics was awarded to Douglas Osheroff, Robert Richardson, and David Lee for discovering superfluidity (apparently frictionless flow) in 3 He. When 3 He is cooled to 2.

What two phase changes occur between vapor water and liquid water and at what temperature does each phase change take place

Suppose you wanted to dissolve 109 g of sodium carbonate in enough water to make 6.00 L of solution. What is the molarity of this solution?

0.0055 in scientific notation

Mineral oil dissolves in hexane but not in ethanol

Which compound becomes less soluble in water as the temperature of the solution is increased

In 1909 Fritz Haber discovered the workable conditions under which nitrogen, N2 (g), and hydrogen, H2 (g), would combine using to produce ammonia.