Exam 2: Atoms, Ions, and Compounds

The average atomic mass of zinc is 65.39 amu. Given the data in the following table, what is the natural abundance of ⁶⁶Zn? Isotope Mass (amu) Natural Abundance (%)⁶⁴Zn 63)9291 48)89⁶⁶Zn 65)9260 ?⁶⁷Zn 66)9271 4)11⁶⁸Zn 67)9249 18)56⁷⁰Zn 69)9253 0)62

The average atomic mass of carbon is 12.01 amu. What is the average atomic mass of carbon in grams? (1 amu = 1.6605402  10^-27 kg)

When cosmic rays strike atoms in the upper atmosphere, energetic neutrons are produced. These neutrons collide with nitrogen-14 atoms, producing carbon-14 atoms and hydrogen atoms. Which diagram represents the carbon-14 product?

What is the empirical formula for benzene, C₆H₆?

In the atoms in the Rutherford-Geiger-Marsden experiment, the  particles were repelled by __________

Which contains more carbon by mass, 1 g of CO₂ or 1 g of CO?

Identify the binary compound that has ionic bonding.

Give an example of an alkali metal.

What is the correct symbol for an  particle?

Dalton's law of multiple proportions deals with __________

Elements 21 through 30 are known as __________

He is the symbol for __________

A hypothetical element has two stable isotopes: one isotope has a mass of 106.9051 amu with an abundance of 48.183%, the other isotope has a mass of 108.9048 amu with an abundance of 51.825%. What is the average atomic mass of this element?

Oxygen is best described as a __________

Nuclear reactors used for power generation require uranium enriched in uranium-235. What is the average atomic mass of enriched uranium consisting of exactly 3.0% uranium-235 (235.04 amu) and 97.0% uranium-238 (238.05 amu)?

Give an example of a metalloid (aka semimetal).

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?

Rutherford, Geiger, and Marsden's experiment demonstrated that the volume of the nucleus is roughly what fraction of the volume occupied by the electrons?

Manganese(IV) oxide is a brown insoluble solid often found as a product of reactions of potassium permanganate. What is the formula of manganese(IV) oxide?

A ion has __________ protons, __________ neutrons, and __________ electrons.