Chapter 2: Measurements and Calculations
Recording Data
In order to share one's scientific findings, it is important to have a standard method of commmunication.
|
A ruler is used to measure length. The width of a dime is approximately 1 mm. |
A scale is used to measure mass. A large paperclip weighs approximately 1 g. |
A stopwatch is used to measure time. |
|
A graduated cylinder is used to measure the volume of a liquid. The amount would be measured as 6.68 mL. |
The mole is not used to measure anything! However, the "mole" is a chemistry unit for the amount of a substance.
Come to the Mole Day celebration on October 23rd! |
A thermometer is used to measure the temperature of a substance. The Celsius scale is used in science and then converted to Kelvin, the SI base unit for temperature. |
Collecting data is an important part of chemistry. In order to collect data, you must understand the units associated with those measurements. We will be measuring things like length, mass, time, temperature, and the amount of a substance. The mole is the SI Unit for the amount of a substance. It is not named after the animal, the mole; however, chemists have adopted this furry creature as a mascot for this important unit of measurement. Don't forget to celebrate Mole Day on October 23rd at 6:02 in the morning.
We will be using Vernier lab equipment to collect much of the data during our labs. There are more than 50 types of sensors created by Vernier in enhance the data collection.
Chapter 2: Measurements and Calculations
Section 1:
Scientific Method Notes
Section 2:
SI Prefixes, SI Units, and Derived SI Units
Density worksheet
This video shows that the density of water is 1 g/mL.
This video shows the size of several cubic units in relation to one another.
Page 40, Practice Problems 1-3 - KEY
Significant Figures worksheet
Significant Figures worksheet KEY
Scientific Notation worksheet
Scientific Notation worksheet KEY
Calculations Using Significant Figures worksheet
Calculations Using Significant Figures worksheet KEY
Taking Measurements handout
Taking Measurements handout KEY
Uncertainty in Measurement worksheet
Uncertainty in Measurement worksheet KEY
Do you want practice taking good measurements? This web site will offer some guidance and practice.
Uncertainty of Digits
Uncertainty of Digits KEY
Dimensional Analysis #1
Dimensional Analysis #1 KEY
Dimenstional Analysis #2
Dimensional Analysis #2 KEY
More... worksheet
More... worksheet KEY
Take Home Exam on Conversions
Take Home Exam on Conversions KEY
Units of Measurement Practice
Units of Measurement Practice KEY
Section 3:
Percent Error worksheet
Percent Error worksheet KEY
Check out this website on Accuracy Vs. Precision
LAB Materials:
Lab: Qualitative Observations of a Chemical Reaction - Be sure to read the entire lab procedure and do the PreLab Assignment. It will be collected. You do not need to print the Lab. It will be given to you. Only print the PreLab Assignment, after you have entered your answers or use the one provided to you in class.
Lab: Density Measurement Challenge - You do not need to do any prelab assignment with this lab. You may, however, read the lab before lab day so you will work more efficiently.
Density Measurement Challenge Lab
Density Homelab - Density Homelab - **If you use this document, you are unable to enter your graphing data onto this document. So, you can either do a graph in Excel and attach it or print the third page and graph it by hand.**
Dimensional Analysis Challenge - You do not need to do any prelab assignment with this lab. It will be completed in groups in class.
Chapter Review:
Chapter 2 Review Terms and Concepts
Chapter 2 PowerPoint
Chapter 2 Book Work, pages 59-60
Here are some practice questions to review for the exam.
The following are the Review Guides to each section and a mixed review. The document contains both the blank review guide and the review guide with answers. Be sure to scroll down completely to get to the answer section. Just let me know if you want any of these documents and I will email them to you.
Section 1 Review
Section 2 Review
Section 3 Review
Mixed Review
|
