6. To the correct number of significant figures, how should the answer to this c
ID: 983992 • Letter: 6
Question
6. To the correct number of significant figures, how should the answer to this calculation be writtern r to this calculation be written? (98.35-97.75) x 28.3- (A) 16 (B) 16.98 (C) 17 (D) 17.0 (E) 20 7. Which of the following equalities is INCORRECT? (A) 2 ns = 2 × 10-9 s (B) 1000 mA 1 A (C) 10-3 k] = 1] (D) 10.2 cm = 1 m 8. Consider a sample of CS2 in a closed container. After the substance is heated past its boiling point, which property/properties of the substance has/have changed? (I) density (II) mass (III) temperature (IV) ratio of C to S atoms (A)I only (B) II only (C) III and IV (D) I and III (E) II, III, and IVExplanation / Answer
6) 98.35 - 97.75 = 0.6
0.6 * 28.3 = 16.98
7) (D) is incorrect.
Because 1 m = 102cm
8) As heat is added to the liquid CS2, there is greater kinetic energy and there are also more vibrations of the molecules. Together these mean that each CS2 unit takes up more space as the temperature increases. Hence, Density increases as the temperature decreases.
Mass is absolutely conserved in a closed container. Hence, mass and atomic ratio can not be changed upon heating.
Correct answer is (D) I and III.
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