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Exam 3: Chemical Compounds

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Question 31

Multiple Choice

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Choose the INCORRECT name/formula combination.

A) NaClO sodium hypochlorite
B) NaClO₄ sodium chlorate
C) NaClO₂ sodium chlorite
D) Sr(IO₃) ₂ strontium iodate
E) SCl₄ sulfur tetrachloride

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Question 32

Multiple Choice

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A mole of the substance water, H₂O, refers to:

A) 12.0000 g H₂O
B) one H₂O molecule
C) 6.02 × 10²³ g H₂O
D) 6.02 × 10²³ H₂O molecules
E) 6.02 × 10²³ atoms of H and O

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Question 33

Multiple Choice

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A 2.000 g sample of water contains 11.19% H by mass and 88.81% O by mass. What percent of H by mass will be found in a 6.00 g sample of water?

The molecular formula for a sugar molecule is C₁₂H₂₂O₁₁. What is the percent of carbon in the molecule?

A 4.05 g sample of a compound containing only C, H, and O was burned completely. The only combustion products were 10.942 g CO₂ and 4.476 g H₂O. What is the empirical formula of the compound?

What is the correct name for the following organic structure? CH₃CH₂CH₂CHClCH₂CH₂CH₂COOH

A 1.500 g sample of compound containing only C, H, and O was burned completely. The only combustion products were 1.738 g CO₂ and 0.711 g H₂O. What is the empirical formula of the compound?

Crystals from evaporation of urine analyze to 22.6% phosphorus. Which compound is probably present?

The oxidation state of silver in the complex ion Ag(CN) 2- is ________.

Oxidation state is related to the number of protons involved in bonding.

An organic compound contains C, H, and O. The percentages of H and C are 6.73% H, and 39.99% C by mass. The molar mass is 60.06 u. What is the molecular formula of the compound?

A strip of electrolytically purified copper weighing 3.178 grams is strongly heated in a stream of oxygen until it is all converted to a black oxide. The resultant black powder weighs 3.978 g. What is the formula of the oxide?

Choose the INCORRECT name formula combination.

From the following percent by mass compositions, determine the empirical formula of the compound. Li = 18.0%, P = 26.7%, O = 55.3%

What is the percentage by weight of phosphorus in calcium phosphate, Ca₃(PO₄) ₂?

Chemical nomenclature is a systematic way of assigning names to chemical compounds.

Choose the INCORRECT name formula combination.

The element M forms the chloride MCl₄ containing 75.0% Cl by mass. What is the atomic weight of M?

The complete combustion of 0.285 g of a pure hydrocarbon yielded 0.878 g CO₂ and 0.405 g H₂O. What is the mass % C in this hydrocarbon?

What is the oxidation state of chlorine in sodium hypochlorite?