True or false ...

1) Polypeptides can be homopolymers or copolymers depending on the sequence of amino acids that reacts.

2) Nucleic acids can be homopolymers or copolymers depending on the sequence of nucleotides that reacts.

Oxygen-16 (15.994915 amu) is synthesized in the sun by fusion of Carbon-12 (12.000000 amu) and Helium-4 (4.00260 amu). How much energy is released in this nuclear reaction? 3.82 x 10-18 kJ X 10-15 1.20 x 101

What volume would 3.01•1023 molecules of oxygen gas occupy at STP?

Given: 2H2O2 → 2H2O + O2 structure of H2O2: H-O-O-H Bond Bond Energy (kJ/mol) O-H 459 O=O 494 O-O 142 Based on the given bond energies, what is the enthalpy change for the chemical reaction? A. - 352 kJ B. - 210 kJ C. - 176 kJ D. - 105 kJ

A period is a horizontal row on the periodic table. a. True b. False

Which type of rock forms as a result of cooling and crystallization? a) clastic b) metamorphic c) sedimentary d) igneous

Compare and contrast chemical potential energy and elastic potential energy

Which of the answer choices best describes how electrons move, according to modern atomic theory? They vibrate in place. They move like planets. They move in orbitals. They slide past each other.

The total solute concentration of a red blood cell is about 2%. Sucrose cannot pass through a red blood cell's plasma membrane, but water and urea can. Which of the following solutions will cause a red blood cell to shrink? a.

A geologist discovered fossils of marine animals in a layer of sedimentary rock in the desert. Based on this discovery, what conclusion can the geologist draw?

How do metals form chemical bonds with other metals?