Lab 1

Question 1

Explain what accuracy is

Answer 1

ACCURACY means that the measurement is true or correct and is free from significant errors.

Question 2

When a value is far from the true mean, the result is/is not accurate

Answer 2

not accurate

Question 3

What is precision

Answer 3

Precision means that the set of repeated measurements are close to the mean value (very little randomness)

Question 4

What are the 3 common techniques for preparing solutions

Answer 4

weighing, measuring (liquids), and pulverizing (particle size reduction)

Question 5

Weighing boats are useful for weighing…

Answer 5

solids and liquids

Question 6

Weighing paper is useful when…..

Answer 6

solids need to be transferred into narrow mouth containers

Question 7

The lower the % error the ______ the accuracy of the measuring device

Answer 7

greater

Question 8

Graduated cylinders are ____ accurate than pipettes

Answer 8

less

Question 9

a conical graduate is ____ accurate than a cylindrical graduate for non-viscous liquids

Answer 9

less

Question 10

When can conical graduates be used for measuring both viscous and non-viscous liquids?

Answer 10

for “qs” (quantity sufficient) and for mixing

Question 11

Cylindrical graduates are used for ____ liquids

Answer 11

nonviscous