Chemical Changes and Density October 15, 2013 Ms. Smith Mrs. Malone Ms. Cedillo DO NOW: Date: October 15, B calculate density to identify an unknown substance 1.Get out your gold Do Now sheet 2.Put your CB and agenda on your desk 3.Write down this week’s HW: “Physical Properties Reading and Questions (Pink Sheet)– Due Friday” 4.Copy this week’s TEKS onto your Do Now sheet 5.Read the Do Now “Reading Science!: Density” 5. Q?: Why was Archimedes’ bathtub discovery significant?

Homework: Physical Properties Reading and Questions (Pink Sheet) – Due Friday Homework: Physical Properties Reading and Questions (Pink Sheet) – Due Friday Announcements: Announcements: – Did you turn in your Mystery Powders Lab last week? It’s a major (test) grade – Science Olympiad meets next Monday!

Density Cornell Notes 1.Turn to next available page in your comp book and title it “Density Notes” 2.Set up your Density Notes page using the yellow Cornell Notes guide at your table 3.Use Mozilla Firefox to visit Click on Handouts 5.Click on density_notes.pptx and open the file 6.Press F5 to make it full screen Having trouble? See the white class set paper in your table organizer for helpful hints about what to write Having trouble? See the white class set paper in your table organizer for helpful hints about what to write We will be performing a comparative investigation about the density of water tomorrow, so take excellent notes today! We will be performing a comparative investigation about the density of water tomorrow, so take excellent notes today!

Chemical Changes and Density October , 2013 DO NOW: Date: October 16-17, D identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in temperature, production of a precipitate, or color change. 6.6B calculate density to identify an unknown substance 1.Put your CB on your desk 2.Read the Do Now “Reading Science!: Density” 3. Q?: In paragraph 1 of this passage, what does the word “embezzled” mean? Ms. Smith Mrs. Malone Ms. Cedillo

Homework: Physical Properties Reading and Questions (Pink Sheet)– Due Friday Homework: Physical Properties Reading and Questions (Pink Sheet)– Due Friday Announcements: Announcements: – Science Olympiad meets next Monday

Density of Water Investigation Major Grade (Test Grade) – Turn it in today Major Grade (Test Grade) – Turn it in today Move 100g riders first, 10g riders second, and use pencil tip to carefully move 1g rider last. Move 100g riders first, 10g riders second, and use pencil tip to carefully move 1g rider last. Triple beam balance measurements are to the hundredths place (2 decimal places). The last digit will be estimated (0 if the rider is right on the line and 5 if it is in between two lines). Triple beam balance measurements are to the hundredths place (2 decimal places). The last digit will be estimated (0 if the rider is right on the line and 5 if it is in between two lines). Read from bottom of meniscus in graduated cylinders to the tenths place (1 decimal place) Read from bottom of meniscus in graduated cylinders to the tenths place (1 decimal place) Clean up all spills and throw paper towels in the trash (not the sink, counters, or recycle bin) Clean up all spills and throw paper towels in the trash (not the sink, counters, or recycle bin)

Chemical Changes and Density October 18, 2013 Ms. Smith Mrs. Malone Ms. Cedillo : Chemical Change Exit Ticket 1.Complete the “Chemical Change Exit Ticket” 2.Hand your teacher the exit ticket on your way out of class

Chemical Changes and Density October 18, 2013 DO NOW: Date: October 18, D identify the formation of a new substance by using the evidence of a possible chemical change such as production of a gas, change in temperature, production of a precipitate, or color change. 6.6B calculate density to identify an unknown substance 1.Put your CB on your desk 2.Turn in your Physical Properties Reading and Questions (Pink Sheet) HW 3.Read the Do Now “Reading Science!: Density” 3. Q?: In paragraphs 3 & 4 of this passage, what clues help you know the meaning of the word “immersed”? Ms. Smith Mrs. Malone Ms. Cedillo

Reminder: Did you turn in your Density of Water lab report? Reminder: Did you turn in your Density of Water lab report? Announcements: Announcements: – Science Olympiad meets next Monday – Tutorials Monday

Chemical Changes and Density October 15, 2013 : Let’s REVIEW before we begin the investigation! Chemical changes occur when matter has changed into a new substance through a chemical reaction.  color change  bubbling and fizzing (gas)  solid precipitate  temperature change  endothermic (cold)  exothermic (hot) Ms. Smith Mrs. Malone Ms. Cedillo

Group Member Roles October 15, 2013 : RED - Materials Manager Obtains and returns all lab materials BLUE - Safety/Clean-up Manager Enforces all safety rules (wear goggles, waft odors, broken glass procedures) YELLOW - Activity Director Reads directions to the group Keeps group on-task GREEN - Data Manager Ensures all group members have lab data and are ready to present Ms. Smith Mrs. Malone Ms. Cedillo

Safety Warning October 15, 2013 : For your safety: The proper way to smell odors in the laboratory is to waft them. Do not put your face directly over chemicals to smell them! Practice this technique with me! Ms. Smith Mrs. Malone Ms. Cedillo

Signs of Chemical Reaction Lab October 15, 2013 : Observations: color, temperature, state of matter, odor (waft!), transparent/opaque, texture, etc. Remember antecedent before pronouns! For example : “The aluminum was an opaque solid. It was silver in color.” Materials: Materials: lab tray, goggles, beaker labeled #1, beaker labeled #2, beaker labeled reactantProcedures: 1.Record detailed observations of both chemicals 2.Gently pour the chemical from beaker #1 into the reactant beaker 3.Gently pour the chemical from beaker #2 into the reactant beaker 4.Record detailed observations onto your lab handout 5.Record evidence of a chemical reaction 6.Clean-up and be ready to present! Ms. Smith Mrs. Malone Ms. Cedillo

Signs of Chemical Reaction Lab October 15, 2013 : Presentations! Each group member should be ready! 1. Give the class your group number 2. Tell the class what you observed about each reactant chemical (color, temperature, state of matter, odor, transparent/opaque) 3. Tell the class what you observed about the product(s) of the reaction (colors, temperature, state of matter, odor, transparent/opaque) 4. Tell the class which signs of a chemical reaction you observed (temperature change, gas produced, precipitate, color change) Ms. Smith Mrs. Malone Ms. Cedillo