15. Asample of a compound known to consist of only carbon, hydrogen is found wo
ID: 473422 • Letter: 1
Question
15. Asample of a compound known to consist of only carbon, hydrogen is found wo a total mass of g lf the mass have the mass of of the carbon is 1802 g formula of the hydrogen is 303 g, what is the empirical the compound? (A) CHO (B) CH (C) CH,0, The diagram above shows the speed distribution of molecules in a gas held at 200 K. Which of the following representations would best represent the gas at a higher Questions 16-18 refer to the following. temperature? (Note: The original line is shown as a dashed line in the answer options.) A solution of carbonic acid, Hoo, is titrated with sodium hydroxide NaoH The following graph is 5 to 15 20 25 30 volume NaoH (ml) 14. Nitrogen's electronegativity value is between those of phosphorus and oxygen. Which of the following comectly 16. In addition to oH what species are present in the solution during section III of the graph? describes the relationship between the three values? (A) Haco, HOO, and co (A) The value for nitrogen is less than that of (B) Hico, and HCO, phosphorus because nitrogen is larger, but greater (C) HOo, and Co. than that of oxygen because nitrogen has a greater (D Hsco, and Co, effective charge. of (B) The value for nitrogen is less than that phosphorus because nitrogen has fewer protons but 17. What is the magnitude of the first dissociation constant? greater than that of oxygen because nitrogen has (A) 10-2 fewer valence electrons. that of (C) The value for is greater than electrons, but nitrogen has fewer phosphorus because nitrogen is smaller. less than that of oxygen because nitrogen (B) 104 (D) value for nitrogen is greater than that of phosphorus because nitrogen is smaller, but less than that oxygen because nitrogen has a smaller effective nuclear charge. GO ON TO THE NEXT PAGEExplanation / Answer
13.The answer is D
as the temperature increases Boltzemann distribution curve is flattening
14.The answer is D
The value of Nitrogen is greater than that of Phosphorous because Nitrogen is smaller: But less than that of Oxygen because nitrogen has smaller effective nuclear charge.
15.The answer is B : C3H6O
16.The answer is C: HCO3- and (CO3)2-
17.The magnitude is 10^-7
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