Chemical Changes and Density

1. Ms. Smith Mrs. Malone Ms. Cedillo Chemical Changes and Density October 15, 2013 • DO NOW: • Date: October 15, 2013 • 6.8Bcalculate density to identify an unknown substance • Get out your gold Do Now sheet • Put your CB and agenda on your desk • Write down this week’s HW: “Physical Properties Reading and Questions (Pink Sheet)– Due Friday” • Copy this week’s TEKS onto your Do Now sheet • Read the Do Now “Reading Science!: Density” • 5. Q?: Why was Archimedes’ bathtub discovery • significant?

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

3. Density Cornell Notes • Turn to next available page in your comp book and title it “Density Notes” • Set up your Density Notes page using the yellow Cornell Notes guide at your table • Use Mozilla Firefox to visit www.ohenryscience6.weebly.com • Click on Handouts • Click on density_notes.pptx and open the file • 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 • We will be performing a comparative investigation about the density of water tomorrow, so take excellent notes today!

4. Ms. Smith Mrs. Malone Ms. Cedillo Chemical Changes and Density October 16-17, 2013 • DO NOW: • Date: October 16-17, 2013 • 6.5 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 • Put your CB on your desk • Read the Do Now “Reading Science!: Density” • 3. Q?: In paragraph 1 of this passage, what does the word “embezzled” mean?

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

6. Density of Water Investigation • 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. • 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) • Clean up all spills and throw paper towels in the trash (not the sink, counters, or recycle bin)

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

8. Ms. Smith Mrs. Malone Ms. Cedillo Chemical Changes and Density October 18, 2013 • DO NOW: • Date: October 18, 2013 • 6.5 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 • Put your CB on your desk • Turn in your Physical Properties Reading and Questions (Pink Sheet) HW • 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”?

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

10. Ms. Smith Mrs. Malone Ms. Cedillo Chemical Changes and Density October 15, 2013 • Let’s REVIEW before we begin the investigation! • Chemical changesoccur 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) :

11. 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 :

12. 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! :

13. 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: lab tray, goggles, beaker labeled #1, beaker labeled #2, beaker labeled reactant Procedures: • Record detailed observations of both chemicals • Gently pour the chemical from beaker #1 into the reactant beaker • Gently pour the chemical from beaker #2 into the reactant beaker • Record detailed observations onto your lab handout • Record evidence of a chemical reaction • Clean-up and be ready to present! :

14. 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) :