Exam 2: Atoms, Ions, and Molecules: Matter Starts Here

Nitrogen and oxygen combine to form several different nitrogen oxides. In one case, 8.4 g of nitrogen reacted completely with 4.8 g of oxygen. In another case, 4.2 g of nitrogen reacted with 9.6 g of oxygen. Which pair of nitrogen oxides is consistent with these data?

Identify the letter of the group that contains the most metalloids.

Which statement is not correct?

Give an example of a metalloid (a.k.a semimetal).

Hypochlorous acid has the formula ________

The emission of a $\beta$ particle is associated with the ________

Locate each element in the periodic table and identify which statement is not correct. The common ion of ________ has ________ electrons and a charge of ________.

Which one of the following is an ionic compound?

Give an example of a transition metal.

There are three major isotopes of silicon: silicon-28, silicon-29, and silicon-30. Given the average atomic mass of silicon is 28.10 amu, estimate the percent abundance of the most abundant isotope of silicon.

What is the empirical formula for dioxane, C₄H₈O₂?

Which one of the following acids is not named correctly?

Radium often is found in uranium ores and can be separated from solutions by precipitation as radium sulfate. What is the formula for radium sulfate?

In the atoms in the Rutherford-Geiger-Marsden experiment, the alpha particles were repelled by ________

Which statement about isotopes of the same element is not correct?

Enriched weapons-grade uranium consists of 80% uranium-235 (235.044 amu) and 20% uranium-238 (238.051 amu). What is the average atomic mass of weapons-grade uranium, assuming the percentages are exact?

The following salts are used in fireworks. Which one has an incorrect formula or is not named correctly?

Which one of the following acids has an incorrect formula or is not named correctly?

What is the correct name for PbS₂?

Which one of the following acids has an incorrect formula or is not named correctly?