Chapter 3 +PT

Question 1

How do you evaluate accuracy and precision?

Answer 1

To evaluate the accuracy, the measured value must be compared to the correct value.
To evaluate the precision, you must compare the values of two or more repeated measurements

Question 2

What is the accepted value, experimental value, error, and percent error?

Answer 2

Accepted Value- a quantity used by general agreement of the scientific community

Experimental Value- a quantitative value measured during an experiment

Error- the difference between the accepted value and the experimental value (e - a)

Percent Error- error/accepted value x 100%

Question 3

What determines the density of a substance?

Answer 3

Density is an intensive property that depends only on the composition of a substance, not the size of a sample.

Question 4

What is dimensional analysis?

Answer 4

A technique of problem-solving that uses the units that are part of a measurement to help solve the problem

Question 5

What is dimension analysis used for?

Answer 5

Solving conversion problems

Question 6

What properties are extensive?

Answer 6

Mass and volume

Question 7

What is hydrolysis used for

Answer 7

Separating compounds

Question 8

What is the space an object takes up?

Answer 8

Volume

Question 9

What are the 4 major stages of the scientific method?

Answer 9

Observing, formulating hypotheses, testing hypotheses, and theorizing

Question 10

How can a mixture be separated?

Answer 10

Physical change