Exam 2: Small Molecules and the Chemistry of Life

A molecule contains five atoms and has a molecular weight of 85 g per mole.The atoms are of elements with atomic numbers 1, 6, and 17.Which molecular structure could represent this molecule?

Refer to the table below. What change would make the table accurate?

Refer to the table and three diagrams below. How can the diagrams be used to justify the density measurements of water at the different temperatures given?

Refer to the figure below. The figure shows the molecular structure of ammonia.Would you expect liquid ammonia to have a heat capacity similar to that of water or very different from that of water? Explain your reasoning.

Drawings of hydrogen, deuterium, and tritium would contain different numbers of

Blood contains bicarbonate ions and carbonic acid and prevents significant changes in pH in the body because they act as _______.

Of the different types of chemical bonds, the strongest bond in biological systems is the _______ bond.

Pharmaceutical chemists use radioisotopic labeling to study how long a drug stays in a test animal and how the drug is metabolized.Explain why radioactive isotopes are useful for these types of studies.

Carbonic acid and sodium bicarbonate act as buffers in the blood.When a small amount of acid is added to this buffer, the H⁺ ions are used up as they combine with the bicarbonate ions.When this happens, the pH of the blood

Nitrogen-14 and nitrogen-15 are isotopes.Nitrogen-15 is used to determine protein structure.Which of the following is true?

Which particles determine how an atom interacts with other atoms?

Which atom has the same number of nuclear particles as ?

Which pair of atoms would be expected to have similar chemical properties?

The figures below have all been used to represent a water molecule.Which could best be used to explain why water is polar?

Why is the pH of a 0.1 M solution of acetic acid in water higher than that of a 0.1 M solution of HCl in water?

Which statement best explains how atoms change partners when propane combusts?

Which compound containing ¹H, ¹²C, and/or ¹⁶O has the greatest number of molecules in a sample with a mass of 2 g?

Which statement comparing a solution of lemon juice (pH ~2) to a solution of tomato juice (pH ~4) is true?

A van der Waals interaction is an attraction between

In a hydrogen molecule, the two atoms are held together by