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Exam 2: Atoms, Molecules, and Ions

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Question 71

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The mineral orpiment, having the empirical formula As₂S₃, was used in ancient times as a cosmetic. What mass of arsenic is present in 5.0 g of orpiment? [Given: naturally occurring arsenic is all arsenic-75; assume that all naturally occurring sulfur is sulfur-32 (only approximately true) ]

A) 0.61 g
B) 3.0 g
C) 1.5 g
D) 2.0 g
E) 3.5 g

F) None of the above
G) A) and E)

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Question 72

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Name the following compound: NaNO₂.

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Question 73

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How many protons are there in one atom of nickel?

Name the straight chain hydrocarbon that contains eight carbon atoms.

Name the following ternary compound: FeSO₄.

The formula for magnesium sulfate is

Give the formula of sulfuric acid.

Give the formula for carbon disulfide.

An empirical formula tell us which elements are present in a compound and gives us the simplest, whole-number ratio of the atoms of these elements in the compound.

Give the formula of hydrochloric acid.

Which of the following elements is chemically similar to magnesium?

In the early 1900s, Ernest Rutherford performed an experiment with gold foil targets and alpha particles to probe the structure of the atoms.He observed that most of these alpha particles penetrated the foil undeflected.Realizing that atoms are electrically neutral (that is, they have equal numbers of protons and electrons)and that the mass of a proton is significantly greater than the mass of an electron, use Rutherford's data to propose a structural model of an atom.

How many neutrons are there in an atom of uranium whose mass number is 235?

Write the formula of calcium carbonate.

Which one of the following elements is most likely to form a 2+ ion?

Give the formula for lithium hydroxide.

What is the formula for the ionic compound formed by magnesium and iodine?

The Stock system name for As₂S₅ is

Write the formula for the acid formed from the hydrogen sulfate anion, and then name the acid.

The formula for isopropyl alcohol is sometimes written as (CH₃)₂CHOH to better indicate how the atoms are connected.How many hydrogen atoms would be contained in 3 dozen isopropyl alcohol molecules?