February 26, 2017

Homework Help: chemistry URGENT

Posted by jazz on Saturday, April 26, 2014 at 1:17pm.

I need someone to check my answers to make sure that I have the correct answers. (3 Part Question)

Two students each measure the density of a quartz sample three times:

Student A Student B
3.20 g/mL 2.82 g/mL
2.58 g/mL 2.48 g/mL
2.10 g/mL 2.59 g/mL
mean 2.63 g/mL 2.63 g/mL

1. which student measured density with the greatest precision? explain your answer.
I think that student B, because their measurement where closest to each other.

2. which student measured density with the greatest accuracy? explain your answer.
I think it was student B as well, because their measurement was closest to the correct value.

3. Are the errors for these students random or systematic? Explain
I think that both students errors were random because each of these measurements were either higher or lower than the accepted value.

Please let me know if I am correct in my thinking.

thanking you in advance

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