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Ms. Smith Mrs. Malone. Chemical Changes . October 7, 2012. DO NOW : Date : October 7, 2012 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.

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Chemical Changes

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Chemical changes

Ms. Smith

Mrs. Malone

Chemical Changes

October 7, 2012

  • DO NOW:

  • Date: October 7, 2012

  • 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.

  • Pick up a new gold Do Now sheet

  • Put your CB on your desk

  • Copy down this week’s TEKS

  • Tape new blue vocabulary onto Pg. 38 and title “Week 7 Vocabulary – Chemical Changes”

  • Read the Do Now “Reading Science!: Formation of a New Substance”

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


Chemical changes

Ms. Smith

Mrs. Malone

Chemical Changes

October 7, 2012

  • Chemical changesoccur 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

:


Chemical changes

Ms. Smith

Mrs. Malone

Group Member Roles

October 7, 2011

  • Green - Materials Manager

    • Only person allowed out of seat during lab

    • Obtains and returns all lab materials

  • Blue – Safety/Clean-up Manager

    • Enforces all safety rules (Goggles!!)

  • Yellow- Activity Director

    • • Reads directions to the group

    • • Keeps group on-task

  • Red - Data Manager

    • Records all data

    • Ensures all group members have lab data

  • :


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Powder Particulars Lab

    October 7, 2012

    • Title: Pg. 39 “Powder Particulars”

    • Hypothesis: I predict…

    • Materials: dropper bottle of vinegar, dropper bottle of water, micro chem plate1 ml scoops of baking sodaand baking powder

    • Procedures:

      • How are these powders similar and different?

      • Add three drops of water into the baking soda. Add three drops of water in to the baking powder. Record your observations

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

    • Observations:

    :


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Powder Particulars Lab

    October 7, 2012

    • Analysis Questions:

    • What does the baking soda do when vinegar is added?

    • What does the baking powder do when vinegar is added?

    • How were the reactions alike?

    • How were the reactions different?

    • Conclusion:

    • In paragraph form complete a lab conclusion. Use page 4 in your CB to complete this assignment.

    :


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Powder Particulars Lab

    October 7, 2012

    • 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?

    :


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Chemical Changes

    October 8, 2012

    • DO NOW:

    • Date: October 9, 2012

    • 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.

    • Put your CB on your desk

    • Read the Do Now “Reading Science!: Formation of a New Substance”

    • 6. Q?: What is the main idea of paragraph 2?


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Chemical Changes

    October 8, 2012

    • Chemical changesis when matter has changed into a new substance through a chemical reaction.

    • color change

    • formation of a gas

    • light production

    • smoke

    • presence of heat

    :


    Chemical changes

    Evidence of a chemical change.

    • 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?


    Chemical changes

    Chemical 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?

    2. Color Change


    Chemical changes

    Chemical Change

    • Temperature Change

      • The substance can get warmer or cooler, 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 changes

    Chemical Change

    • Formation of a Precipitate

      • A precipitate forms when a substance come out of solution, and form 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 changes

    Is it a chemical change?

    ANSWER: YES

    EVIDENCE: - Smoke, - color change,

    - temperature change

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


    Chemical changes

    Is it a chemical change?

    ANSWER: No

    (the water is turning brown because the cocoa is brown)

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


    Chemical changes

    Is it a chemical change?

    ANSWER: Yes

    EVIDENCE: Color change, precipitate forming (rust)

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


    Chemical changes

    Is it a chemical change?

    ANSWER: No

    (No new substance is forming)

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


    Chemical changes

    Is it a chemical change?

    ANSWER: No

    (No new substance is forming)

    Ice cream melts after it falls on the ground.


    Chemical changes

    Is it a chemical change?

    ANSWER: Yes

    EVIDENCE: Color change

    A raw egg gets cooked.


    Chemical changes

    Is it a chemical change?

    ANSWER: Yes

    EVIDENCE: gas formation

    When Alka Seltzer is dropped into water it fizzes.


    Chemical changes

    Is it a chemical change?

    ANSWER: No

    (The paper is turning red because the crayon is red.)

    Crayons change white paper to red.


    Chemical changes

    Is it a chemical change?

    ANSWER: No

    (The bubbles were already there, just under pressure in the bottle.)

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


    Chemical changes

    Is it a chemical change?

    ANSWER: Yes

    EVIDENCE: - color change

    - temperature change

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


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Chemical Changes

    October 9-10, 2012

    • DO NOW:

    • Date: October 9-10, 2012

    • 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.

    • Put your CB on your desk

    • Tape the Cornell Notes onto Pg. ___ and title “Chemical Changes Notes”

    • 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?


    Chemical changes

    Ms. Smith

    Mrs. Malone

    Group Member Roles

    Block Day

    • 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

  • Red- Activity Director

    • • reads directions to the group

    • • keeps group on-task

  • Yellow - Data Manager

    • records all data

    • ensures all group has lab data

  • :


    Chemical changes

    Chemical Change

    • 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 changes

    Ms. Smith

    Mrs. Malone

    Chemical Changes

    October 11, 2012

    • DO NOW:

    • Date: October 11, 2012

    • 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.

    • Put your CB on your desk

    • Tape the Cornell Notes onto Pg. ___ and title “Chemical Changes Notes”

    • Read the Do Now “Reading Science!: Formation of a New Substance”

    • 6. Q?: What are some uses of the chemicals

    • found in fireflies?


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