Do Now for 9/24/13

 Today’s Target: To accurately collect data about the properties of 4 unknown solids.  (safety review video) (safety review video)  Introduce A7  Lab Safety  Gather data for the solids that were found in our mixture.  Clean up

 What were the two liquids we identified from our unknown mixture?  Mineral oil  Iron Nitrate  Do we consider the unknown mixture to be hazardous?  Yes  Why?  Iron nitrate is toxic (poisonous)and corrosive (burns)

Black squares/rectangles Large cylinders Small cylinders Red tubes

 Use the tests on page A-29 to gather data about the 4 types of solids:  4 Tests:  Conductivity – Ability to transmit electricity. ▪ Light bulb illuminates = conducts electricity.  Density relative to water – Float or sink in water. ▪ Floats = less dense, sinks = more dense.  Density relative to ethanol – Float or sink in ethanol. ▪ Floats = less dense, sinks = more dense.  Reacts with copper chloride – Evidence of a chemical reaction. ▪ Evidence of a reaction = color change, bubbling, cloudiness, temperature change, formation of a precipitate (solid forms in the presence of a chemical reaction)

 Lab Safety and technique  Goggles and aprons.  Do NOT handle the solids with your hands – use the forceps.  Clean the solids with soap, water, and steel wool prior to testing. Red, Yellow, Green  Lab Progress (Red, Yellow, Green)  Red card  Red card = Just starting, lots to do.  Yellow card  Yellow card = Half way done.  Green card  Green card = Data gathered. Station cleaned up.

 Clean up  Wash and dry each sample.  Wash your hands when complete.  Share your data with your partners.  NO ONE MAY REMOVE THEIR SAFETY EQUIPMENT UNTIL I HAVE CLEARED THEIR STATION.

 Take out a 3x5 card and put your name, today’s date, and this period in the upper right hand corner.  Answer the following question:  If your lab group had: red card  a red card: What caused you to get so far behind, and what can you do to prevent it from happening again? yellow card  a yellow card: How many unknown solids do you have left to gather data on, and what was your most challenging part of gathering data? green card  a green card: What was your secret for successfully gathering all the data?  DUE AT THE END OF THE PERIOD!!!

Do Now for 9/25/13

 Today’s Target: To use evidence to properly identify the solids that were contained in our unknown mixture.  Lab Safety  Gather data for remaining solids  Clean up  Review data  Analysis 1 through 3

 Use the tests on page A-29 to gather data about the 4 types of solids:  4 Tests:  Conductivity – Ability to transmit electricity. ▪ Light bulb illuminates = conducts electricity.  Density relative to water – Float or sink in water. ▪ Floats = less dense, sinks = more dense.  Density relative to ethanol – Float or sink in ethanol. ▪ Floats = less dense, sinks = more dense.  Reacts with copper chloride – Evidence of a chemical reaction. ▪ Evidence of a reaction = color change, bubbling, cloudiness, temperature change, formation of a precipitate (solid forms in the presence of a chemical reaction)

 Lab Safety and technique  Goggles and aprons.  Do NOT handle the solids with your hands – use the forceps.  Clean the solids with soap, water, and steel wool prior to testing.  Wash your hands when complete.  Share your data with your partners.

 Analysis  #1 What is the:  Red tube –  Black Square –  Small Cylinder -  Large Cylinder -  #2 Were you able to identify what material each solid was made of? Explain

 Data: Properties of separated solids TestRed TubeBlack Square Small Cylinder Large Cylinder Electrical Conductivity Density relative to water Density relative to ethanol Reacts with copper chloride

 Data: Properties of separated solids TestRed TubeBlack Square Small Cylinder Large Cylinder Electrical Conductivity No Yes Density relative to water Floats Sinks Density relative to ethanol Sinks Reacts with copper chloride None Reacts

 Analysis  #1 What is the:  Red tube –  Black Square –  Small Cylinder -  Large Cylinder -  #2 Were you able to identify what material each solid was made of? Explain

 #3 Which tests identified physical properties? Chemical properties?

 Take out a 3x5 card and put your name, today’s date, and this period in the upper right hand corner.  Answer the following question on your card:  What Characteristic do you think was the best to use to identify the unknown solids? Why?  DUE AT THE END OF THE PERIOD!!!

 Take out something to write with.  HW: A7 #1 is due tomorrow  A7# 5 is worth a test grade and is due Tuesday.

 Today’s Target: To write a better analysis answer for A6#1  Return work: Volume songVolume song  Go over A6#1  Key Points and Vocabulary for A7  A7 #1 Rubric  A7 #5 Rubric  #1 is due tomorrow  #5 is due Tuesday

 Key Concepts: Write these down and give an example from the previous activities where this is shown.  Substances have characteristic properties such as density, that are independent of the amount of the sample. ▪ Ex.  Scientists use appropriate tools and techniques to gather, analyze, and interpret data. ▪ Ex.  Scientific explanations emphasize evidence. ▪ Ex.

 Vocabulary  Evidence-A1  1. Conductivity: A measure of the tendency of an object to support the flow of heat or electricity.  2. Density: The relationship between the mass and volume of a substance. The mass per unit volume, specifically grams per cubic centimeter, or grams per milliliter. Density equals mass divided by volume (d = m/v).  3. Reactive (reactivity): Substances capable of causing an explosion or providing heat or oxygen (oxidizers) that might cause a fire, or can emit toxic fumes when mixed  with other substances.

 Your task (#5 on page A-30): Write a letter to the state’s Hazmat Training Center explaining the safety procedures you followed while identifying the solids and liquids in activities A5, A6, and A7.  Your letter must include:  All the safety steps taken in the process.  Why each safety step was necessary.  Your letter will be graded based on:  The number and accuracy of the steps listed.  The clarity of the explanation of the reason for each step.  Technical aspects: ▪ Spelling ▪ Proper format ▪ Neatness ▪ Grammar ▪ Etc.  PROJECT DUE ON Tuesday October 2 nd.

 Take out a 3x5 card and put your name, today’s date, and this period in the upper right hand corner.  Answer the following question on your card:  How are you going to improve your answer for A6 #1?  DUE AT THE END OF THE PERIOD!!!