Unit 1 Mass and Volume Lab Volume What

Unit 1: Mass and Volume Lab

Volume • What are the ways society measures volume? • How should scientist measure volume?

Volume We can measure the volume of cylinder using the formula: πr 2 h. We can measure the volume of irregular object using water displacement. Amount of H 2 O with object = ______ About of H 2 O without object = ______ Difference = Volume = ______

Mass & Volume Lab • Goal: What relationship exists between mass and volume?

Best Practice • Lab procedures • Minimize error?

By the End…. . Once you have your two measurements, add your data to the class data on Mrs. Askew’s Computer. No Units (my data table has the units listed) This must be done by the end of class. Return to your seat, there is no closure but, study for your quiz.

Mass and Volume Lab • Do you think there is a relationship between mass and volume? • How do you think we can determine if a relationship exist?

Class Data • Simple Graph

Class Discussion With your shoulder partner discuss the following talking points and write a short response on your white board. 1. What type of mathematical relationship seems to exist? 2. Were there any outliers in the original data? Why? 3. What would the best fit line look like? Draw a picture on your white board.

Class Discussion • Simple Graph

Class Discussion • Density is mass per unit volume. • Gram per centimeter cubed or • • Grams per milliliter What does this per mean? How do we write that mathematically? g g cm 3 m. L

Data Graph with two best fit line, with slope equation

Data Can you write a density value in a sentence?

Data What would these two different plastics look like at the particle level?

Percent Error This is the last key concept for Unit 1 - Measurement, Accuracy, and Precision Notes

Percent Error • Key Concept 10: Percent error expresses error as a percentage of the accepted value. Get out your periodic tables

Example A substance has an accepted density of 2. 00 g/L. You measured the density as 1. 80 g/L. What is the percent error? A. A B. B C. C D. D

Exit Pass- Show calculation and circle answer. Joshua uses his thermometer and finds the boiling point of ethyl alcohol to be 75 C. He looks in a reference book and finds that the actual boiling point of ethyl alcohol is 80 C. What is his percent error? A. A B. B C. C D. D

End of Day

Class time to finish Accepted Values Tecaform- 1. 4033 g/ml Nylon- 1. 1404 g/ml