Unit 1.3 Scientific Notation + Measurement

Question 1

Why do scientists use scientific notation?

Answer 1

Reduces clutter and confusion while dealing with huge and tiny numbers

Question 2

Convert 23000000 to Scientific Notation

Answer 2

2.3 * 10^7

Question 3

Convert -0.000234 to Scientific Notation

Answer 3

-2.34 * 10^-4

Question 4

Why might measurements in a process be uncertain?

Answer 4

Limitations of the instrument and/or user’s skill

Question 5

What should you always do when recording measurements?

Answer 5

Record (estimate) one decimal place past the smallest division on the scale even if the number is a zero

Question 6

What is a meniscus?

Answer 6

The curve on the surface of a liquid when placed inside a container

Question 7

How should you read a meniscus?

Answer 7

Eye is at the same level of the meniscus and typically read to the bottom of the meniscus

Question 8

Define Accuracy.

Answer 8

How close a measurement comes to the accepted standard value.

Question 9

Define Precision.

Answer 9

The consistency of how close measurements are to each other through repeated tests.

Question 10

What is the formula for Percent Error?

Answer 10

%Error = |(Experimental Value - Actual Value )| / Actual Value x 100%