35. A student docs 4 experiments to determine an unknown density. His results ar

Question

35. A student docs 4 experiments to determine an unknown density. His results are: 0.333 g/cc, 0.334 g/cc, 0.332 g/cc and 0.333 g/cc. The correct value is 0.765 g/cc. The student's results are: 38. T A) precise and accurate. B) accurate but not precise C) precise but not accurate. D) neither precise nor accurate 36. A student calculates the density of an unknown solid The mass is 10.040 grams and the volume is 8.21 cubic If the posit A) 54 B) 54 C) 54 D) 540 centimeters. How many significant figures should be in the answer? A) 5 B) 1 C) 3 D) 4 E) 2 39. What K A) 292 B) 226 C) 249 D) -292 E) 254 37. Which alkali metal is the LEAST reactive? A) berylliunm B) lithium C) sodium D) francium

Explanation / Answer

Solved all the three problems on the first page, post multiple question to get the remaining answers as per Chegg guidelines

Q35) The correct answer is Option C (precise but not accurate)

Reason: All the students readings are very close (precise) (0.332,0.333,0.334 and 0.335) with the maximum deviation in values of 0.003, which means the readings are very precise and close to each other. But they are not accurate, since the correct answer is almost double of these readings

Q36) Density = Mass/Volume

Mass has 5 significant digits (10.040) whereas the volume has only three significant digits (8.21), hence the final reported density must be having the least of these, which is 3 significant digits

Correct answer is Option C

Q37) Correct answer is Option B (Lithium)

Reactivity increases down the group

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