Exam 2: Atoms, Ions, and Compounds

For each of the elements below, there are only two naturally occurring isotopes. Using information in your periodic table, identify the pair in which the heavier isotope is the more abundant one.

Elements in group 17 (VIIA) are called __________

Sodium nitrite, which is used in meat processing, has been implicated as a possible health hazard because it can react with amines present in meat to form trace quantities of carcinogenic nitrosamines. What is the formula of sodium nitrite?

Name the following oxides of nitrogen in this sequence: NO, N₂O, NO₂, N₂O₄.

Iodine-137 decays to xenon by beta emission, which then decays to cesium-137. Write the nuclear reaction equations for these two decay processes.

What is the correct symbol for an electron?

What is the correct symbol for a neutron?

Which particle-level diagram is the best representation of a ion?

The evaporation of seawater gives a mixture of ionic compounds containing sodium combined with chloride, sulfate, carbonate, and hydrogen carbonate. Write the chemical formulas of these compounds.

If an atom had a radius of 100 m, it would be approximately the size of a football stadium. On this scale, what would be the radius of the atomic nucleus since the radius of the nucleus is approximately 10,000 times smaller than the radius of an atom?

What is the correct formula for the compound formed between sodium and iodine based on their positions in the periodic table?

Which one of the following is an ionic compound?

What is the correct name for SO₃?

Give an example of a molecular compound (aka a covalent compound).

The average atomic mass of calcium is 40.078 amu. Which is the most abundant isotope of calcium?

Buffer solutions that maintain certain levels of pH or acidity are widely used in biochemical experiments. One common buffer system uses sodium dihydrogenphosphate and sodium monohydrogenphosphate. What are the formulas of these two compounds?

Zinc oxide is found in ointments for the skin. What formula best describes this compound, which has Zn as a doubly charged cation?

What is the correct name for CuCl₂?

Which one of the following is a cation?

Nitrogen and oxygen combine to form several different nitrogen oxides. Chemical analysis found that the N:O mass ratio in NO is 0.875. Two other nitrogen oxides were produced by reacting 8.4 g of nitrogen completely with 4.8 g of oxygen in one case and in another case by reacting 4.2 g of nitrogen with 9.6 g of oxygen. What are the empirical formulas of these two nitrogen oxides?