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

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Question 31

Multiple Choice

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Which polyatomic ion is not labeled correctly?

A) NH₄⁺ammonium
B) ClO₄^- perchlorate
C) CN^- cyanate
D) NO₃^-nitrate
E) All are labeled correctly.

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Question 32

Multiple Choice

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Which one of the following is a molecular compound? Molecular compounds also are known as covalent compounds.

A) Na₂O
B) CaO
C) FeO
D) CCl₄
E) Fe₂O₃

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Question 33

Multiple Choice

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Which one of the oxoacid formulas and names is not correctly matched?

The sixth period of the periodic table contains ________ elements.

Which one of these formula-name combinations is not correct?

A O ion has ________ protons, ________ neutrons, and ________ electrons.

Aqua regia is a mixture of hydrochloric acid and nitric acid that is capable of dissolving gold. What are the formulas of these acids?

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?

The Curiosity rover now on Mars analyzed rocks and found magnesium to have the following isotopic composition. What is the average atomic mass of magnesium in these rocks? Mass (u) % Abundance 23) 9872 79) 70 24) 9886 10) 13 25) 9846 10) 17

Which one of the following is a cation?

What is the chemical formula for dinitrogen tetroxide?

What is the correct name for PCl₅?

The formula for a terbium phosphate compound is Tb₃(PO₄) ₄. What would be the formula for a terbium sulfate compound given that the charge of terbium is the same in both compounds?

What is the chemical formula for calcium nitrite?

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?

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

Give an example of an ionic compound.

Which element labeled A-E in the periodic table below will have an ionic charge of +3?

Give an example of a halogen.

Protons and neutrons are examples of ________