Chemical Changes and Density

Chemical Changes and Density October 15, 2013

Ms. SmithMrs. MaloneMs. Cedillo

DO NOW:Date: October 15, 2013

6.8B calculate density to identify an unknown substance

1. Get out your gold Do Now sheet2. Put your CB and agenda on your desk3. 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 sheet5. 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

• Announcements:– Did you turn in your

Mystery Powders Lab last week? It’s a major (test) grade

– Science Olympiad meets next Monday!

Density Cornell Notes1. 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 table3. Use Mozilla Firefox to visit

www.ohenryscience6.weebly.com4. Click on Handouts5. Click on density_notes.pptx and open the file6. 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!

http://www.ohenryscience6.weebly.com/

Chemical Changes and Density October 16-17, 2013

DO NOW:Date: October 16-17, 20136.5 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

1. Put your CB on your desk2. Read the Do Now “Reading Science!: Density”3. Q?: In paragraph 1 of this passage, what does the word “embezzled” mean?


• Homework: Physical Properties Reading and Questions (Pink Sheet)– Due Friday

• Announcements:– Science Olympiad

meets next Monday

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)



:

Chemical Change Exit Ticket

1. Complete the “Chemical Change Exit Ticket”

2. Hand your teacher the exit ticket on your way out of class


DO NOW:Date: October 18, 20136.5 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

1. Put your CB on your desk2. Turn in your Physical Properties Reading

and Questions (Pink Sheet) HW3. 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”?


• Reminder: Did you turn in your Density of Water lab report?

• Announcements:– Science Olympiad

meets next Monday–Tutorials Monday


:

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)


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


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!


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: 1. Record detailed observations of both chemicals2. Gently pour the chemical from beaker #1 into the reactant beaker3. Gently pour the chemical from beaker #2 into the reactant beaker4. Record detailed observations onto your lab handout5. Record evidence of a chemical reaction6. Clean-up and be ready to present!


Signs of Chemical Reaction Lab October 15, 2013

:

Presentations! Each group member should be ready!1. Give the class your group number2. 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)


Chemical Changes and Density

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