Which statement supports the claim that the continental crust was once joined together as one supercontinent, Pangaea?

Which statement describes how amino acids combine to form the backbone structure of proteins? A. They form peptide bonds between the amino group of one amino acid and the carboxyl group of another amino acid. B.

5. There is water on the pan of the scale as you measure the mass of a mineral. If you were to ignore the water, what would be the effect on your density calculation?

Copy and balance these chemical equations "K

Why was democritus not considered on on scientist?

Thorium-234 has a half-life of 24.1 days. How much of a 100-g sample of thorium-234 will be unchanged after 48.2 days?

An element with a single electron in its highest energy level is probably

Chemical bonds are likely to form when A. two atoms have the same number of electrons. B. an atom's outer energy level doesn't have the maximum number of electrons. C. an atom's nucleus has the same number of protons as neutrons. D.

How many grams of nacl are required to make 500.0 ml of a 1.500 m solution?

One mole of air at 310 k confined in a cylinder under a heavy piston occupies a volume of 4.9 l. the heat capacity of air under constant volume is 5 2 r. find the new volume of the gas if 3.9 kj is transferred to the air. answer in units of l

Given the balanced equation representing a reaction: 2CO (g) + O2 (g) 2CO2 (g) What is the mole ratio of CO (g) to CO2 (g) in this reaction? (1) 1:1 (3) 2:1 (2) 1:2 (4) 3:2