chemical changes

Chemical Changes October 7, 2013

Ms. SmithMrs. MaloneMs. Cedillo

DO NOW:Date: October 7, 2013TEKS: (Yes, write the WHOLE thing!)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.

1. Pick up a new gold Do Now sheet2. Put your CB on your desk3. Copy down this week’s TEKS4. Read the Do Now “Reading Science!: Formation of a New

Substance”6. Q?: Why do scientists call firefly light “cold light?”

• Homework: Chemistry in the Kitchen – due Friday! Get it signed by parent/guardian!

• Announcements: – Tutorials Monday– Science Olympiad

meets Tuesday

Today’s To-Do List1. Finish Periodic Table Tile

– Use computer to finish research– Have your tablemates check your spelling– Use the rubric to make sure you have all parts– Flair! Color! Eye-catching! Neat! Complete!

2. Check your CB to make sure you have completed your Museum Brochure for The Elements of a Display

3. STEMscopes vocabulary and review games online

Giant Periodic Table Project• You will be assigned an

element to research• Use approved websites on

ohenryscience6.weebly.com• Click on Handouts for links

• Metals on blue paper• Nonmetals on yellow

paper• Metalloids on green

paper

Items that must be on your poster: 1. Name of the element2. Element’s chemical symbol3. Where is the element found in nature

(Atmosphere? Crust?)4. How humans get this element

(example: mining)5. How this element is used6. Whether the element is a metal, non-

metal, or metalloid7. When was element discovered8. Who discovered this element and 2

facts about the scientist (Discovered centuries ago? No scientist credited? Write 2 fun facts about the element!

9. Illustrations! (Drawings, pictures, or photographs of the element or things it makes up)

Your paper should be this way

STEMscopes1. Visit www.ohenryscience6.weebly.com and click

on handouts2. Click the link to sign in to STEMscopes3. Username: ASmith Password: science4. Review the Picture Vocabulary and then check

out the vocabulary and review games! Have you mastered your metals, nonmetals and metalloids vocabulary? Are you an element expert?

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


DO NOW:Date: October 8, 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.

1. Put your CB on your desk2. Title a new page “Chemical Changes Notes”3. Read the Do Now “Reading Science!:

Formation of a New Substance”6. Q?: What is the main idea of paragraph 2?



• Announcements: – Science Olympiad

meets Mondays after school. Join the club!

– Vocab quiz Friday


:

Chemical changes occur when matter has changed into a new substance through a chemical reaction.

color change bubbling and fizzing (gas) light production smoke presence of heat or cold solid precipitate


Group Member Roles October 8, 2013

:

Green - Materials Manager • Only person allowed out of seat during lab• Obtains and returns all lab materials

Yellow – Safety/Clean-up Manager • Enforces all safety rules (Goggles!!)

Blue - Activity Director • Reads directions to the group• Keeps group on-task

Red - Data Manager • Records all data • Ensures all group members have lab data


Powder Particulars Lab October 8, 2013

:

• Next new page of Comp Book• Title: “Powder Particulars”• Hypothesis: I predict…• Materials: dropper bottle of vinegar, dropper bottle of water, micro

chem plate1 ml scoops of baking soda and baking powder • Procedures:

1. How are these powders similar and different?2. Add three drops of water into the baking soda. Add three drops of water in to

the baking powder. Record your observations3. Add three drops of vinegar into the baking soda. Add three drops of vinegar

into the baking powder. Record your observations.

• Observations:

Baking Soda Baking Powder



:

Analysis Questions:

1. What does the baking soda do when vinegar is added?2. What does the baking powder do when vinegar is added?3. How were the reactions alike?4. How were the reactions different?

Conclusion:

In paragraph form complete a lab conclusion. Use page _____ in your CB to complete this assignment.



:

• Watch this!• You added an acid to your powders to see how their

chemical properties could help you tell them apart.• I will add a pH indicator called “Universal Indicator”

to two identical looking powders. • Universal Indicator changes color depending on the

pH of the substance it touches.• pH tells you how acidic or basic something is.• Do I have two identical powders or two different

powders? How can you tell?


Demonstration

• Copper (II) Sulfate + Ammonia • Did a chemical reaction occur?• What was the sign of a chemical change?

Chemical Changes Oct 9-10, 2013

DO NOW:Date: October 9-10, 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.

1. Put your Comp Book (CB) on your desk2. Read the Do Now “Reading Science!: Formation of

a New Substance”6. Q?: In paragraph 3 of this passage, what does the

word “efficient” mean?



• Announcements: – Science Olympiad

meets on Mondays– Vocab quiz Friday

Chemical Changes October 9-10, 2013

:

Chemical changes - matter has changed into a new substance through a chemical reaction.

color change formation of a gas light production smoke presence of heat


1. Formation of a gas

When you mixed baking soda or baking powder and vinegar, the bubbles you saw were CO2 gas.

Can you think of any examples of bubbling that do not create a new substance?

Evidence of a chemical change.

2. Color Change

◦Color is a property of how the molecule is arranged. If there is a change to the molecule, the color can change.

◦Color change doesn’t always mean that a chemical change occurred.

◦Can you think of any examples of a substance changing color that does not create a new substance?

Chemical Change

3. Temperature Change

• The substance can get hot (exothermic) or cold (endothermic), depending on whether the molecules give energy while swapping places (warmer), or need energy to swap (cooler).

• Temperature change doesn’t always mean that a chemical change occurred.

Can you think of any examples of a substance getting warmer or colder that do not create a new substance?

Chemical Change

4. Formation of a Precipitate

• A precipitate forms when a substance comes out of solution, and forms a solid.

• Formation of a precipitate doesn’t always mean that a chemical change occurred.

• Can you think of any examples of solids forming in a liquid that do not create a new substance?

Chemical Change

• A chemical change occurs when universal indicator is added to acids and bases

– Universal indicator is an indicator, because it contains molecules that change color when an acid or base is added to them. Compare your samples to the key.

Universal Indicator

Group Member Roles Oct 10-11, 2012

:

Blue - Materials Manager • only person allowed out of seat during lab• obtains and returns all lab materials

Green - Safety/Clean-up Manager • enforces all safety rules, goggles

Red- Activity Director • reads directions to the group• keeps group on-task

Yellow - Data Manager • records all data • ensures all group has lab data


Mystery Powders Steps for Success• Each powder has its own numbered

column. Use the index cards to keep the powders separated when adding to the wells

• Describe all 6 powders BEFORE reacting (color, texture, state of matter)

• Describe all 4 liquids BEFORE reacting (color, smell, state of matter)

• Add all 24 powders BEFORE reacting any chemicals

• GOGGLES ON AT ALL TIMES. MICROCHEMISTRY PLATES WILL SPLASH WHEN RINSED!

Mystery Powders Analysis and Conclusion

• Fill in your data table – no blanks! Write “No reaction” if there was no reaction

• Answer the analysis questions with your group and support your answers with your data

• Write a conclusion for Mystery Powders using Page 4 Lab Resources – Lab Conclusion Guide from your interactive notebook (comp book). You will need to continue onto the back of your lab report paper

• TURN IN YOUR LAB REPORT PAPER

• A chemical change occurred when universal indicator was added to cream of tartar and laundry detergent.

– Universal indicator is an indicator, because it contains molecules that change color when an acid or base is added to them.

– Cream of tartar is an acid, so it gave particles to the indicator, making it turn from purple to red.

– Laundry detergent is a base, so it took particles from the indicator, making it turn from red back to purple.

Chemical Change

Is It a Chemical Change?Whiteboard Review

• Write YES if the example shows signs of a chemical change

• Write the sign(s) that prove that the example is a chemical change

• Write NO if the example if not a chemical change

• Explain why it is a physical change and not a chemical change

A forest fire destroys acres of land. There is a lot of smoke, and the trees turn to charcoal.

ANSWER: YESEVIDENCE: - Smoke, - color change,

- temperature change

Is it a chemical change?

When making hot cocoa, clear water turns brown when you mix the cocoa in.

ANSWER: No(the water is turning brown because the cocoa is brown)


An old wheelbarrow is left out in the rain and rusts.

ANSWER: YesEVIDENCE: Color change, precipitate forming (rust)


On a hot day, water forms on the outside of a cold glass of water.

ANSWER: No(No new substance is forming)


Ice cream melts after it falls on the ground.

ANSWER: No(No new substance is forming)


A raw egg gets cooked.

ANSWER: YesEVIDENCE: Color change


http://www.saskschools.ca/curr_content/science9/chemistry/images/les8images/eggbef.gif

http://www.saskschools.ca/curr_content/science9/chemistry/images/les8images/eggaft.gif

When Alka Seltzer is dropped into water it fizzes.

ANSWER: YesEVIDENCE: gas formation


Crayons change white paper to red.

ANSWER: No(The paper is turning red because the crayon is red.)


Soda fizzes, and bubbles rise as you pour it in a glass.

ANSWER: No(The bubbles were already there, just under pressure in the bottle.)


When you crack a glow stick, hydrogen peroxide mix with other chemicals, causing it to glow and warm up.

ANSWER: YesEVIDENCE: - color change

- temperature change



DO NOW:Date: October 11, 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.1. Turn in “Chemistry in the Kitchen”

Homework2. Get out gold Do Now sheet and read

“Reading Science!: Formation of a New Substance”

4. Q?: What are some uses of the chemicals found in fireflies?5. Gold Do Now sheet is due today


• Announcements: – Absent for this week’s

lab? Make it up in tutorials after school on Monday

– Science Olympiad meets Monday!

– Did you turn in your Chemistry in the Kitchen Homework?

– Did you turn in your Do Now sheet?

Chemical Changes Cornell Notes

• www.ohenryscience6.weebly.com• Click on Handouts. Click on the Chemical

Changes Presentation link. Click Open. • Press F5 to make the presentation full screen

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

chemical changes

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