January 2013 Chemistry Regents #66-69

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  Base your answers to questions 66 through 69 on the information below.

Nitrogen gas and oxygen gas make up about 99% of Earth’s atmosphere. Other atmospheric gases include argon, carbon dioxide, methane, ozone, hydrogen, etc. The amount of carbon dioxide in the atmosphere can vary. Data for the concentration of CO2(g) from 1960 to 2000 are shown in the table below.

 

66 Identify one diatomic element found in the atmosphere. [1]

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H2

oxygen

nitrogen

67. Explain, in terms of types of matter, why methane can be broken down by chemical means, but argon can not be broken down by chemical means. Your response must include both methane and argon. [1]

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Methane is a compound consisting of two elements, so it can be broken down by chemical means, but argon is an element, which cannot be broken down.

Methane is a compound and argon is an element.

68 Show a numerical setup for calculating the mass of carbon dioxide in a 100.0-gram sample of air taken in 1980. [1]

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338.7ppm= (X/100.0g) x 1,000,000

69 Explain why the atmosphere is classified as a mixture. [1]

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The gases in a mixture can be separated by physical means.

The gases in the atmosphere are separate elements or compounds that are not chemically combined with each other.

The proportions of the gases in the atmosphere can vary.

more than one substance

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Questions 51 Questions 52-54 Questions 55-58 Questions 59-61 Questions 62-65 Questions 66-69

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