November 19, 2014 Homework : Quiz on Tues. 11/25 Organize notes on Physical and Chemical Change into a T- Chart --- may draw pictures as well. Complete.

November 19, 2014 Homework: Quiz on Tues. 11/25 Organize notes on

Physical and Chemical Change into a T- Chart --- may draw pictures as well. Complete on copy paper-Use a ruler

Do Now:Agenda- HomeworkUpdate T.O.C- pg. 37-Observing Chemical reactionsOpen textbooks to pg. 18- Add Precipitate to Log of Sci.

terms (pg. 30).Open binders to pg. 36-Evidence of Chemical Change

Contrast Physical and Chemical Change

Make a T- Chart similar to the one started below:

Physical Change Chemical Change

Liquid Water –Freezing into snow/Ice (solid)

Cooking an Egg

The parts of water do notChange , just its form, itIs still H2O

1 2

Evidence of a Chemical Reaction

There is a formation of gas which can be seen by a fizzing or bubbling

The reaction will cause heat (temperature Change), light or odor to be emitted- Changes in chemical properties

A color change is producedA solid (precipitate) is formed during the

change

On the back of pg. 36

The key characteristic of a chemical reaction is the production of new materials that are chemically different from the starting materials.

Let’s see…http://www.youtube.com/watch?v=DOb_BRydnCs

What happens to the mass of the matter during chemical reactions?

A Chemical change, or Chemical Reaction, is like scrambling the letters of a word to make new words. Ex: Elements Steel + Men

Were any of the letters removed?Law of Conservation of Mass- Matter can not be

created or destroyed in any physical/ chemical change or reaction only (made) into something else.Atoms are rearranged

Which of these pictures is an example of a physical change? Which is a chemical change?-Write a C for Chemical and P for the Physical. Post it1 2 3-

popcornChopping Wood

Burning Logs

November 20, 2014

Homework: Complete Section 1 Review Sheet- Quiz on Tuesday- “Section Notes/Study Guide,” online.

Do Now: Agenda- Write Homework-Take out (P & C Change T-Chart) Get Your and two partners lab journals Update Lab Journal T.O.C pg. 5 -Alka Seltzer to the rescue! Begin writing materials list and procedure on pg. 5

Alka Seltzer to the Rescue Lab

Questions to consider for observations:

Look for Evidence of a Chemical ReactionDid any of these things happen?

There is a formation of gas which can be seen by a fizzing or bubbling

The reaction will cause heat, light or odor to be emittedA color change is producedA solid is formed during the change

Conclusion Questions- Record in Journal

1)Using your observations- What evidence do you have that a chemical reaction took place when you added the alka-seltzer to the water?

2) Describe how you think this experiment relates to the Law of Conservation of Mass? (What were your results?)

3)Write your own definition of the law of conservation of mass.

4)What is another experiment you could think of doing that could produce similar observations?

November 21, 2014

Homework: Study for quiz Tuesday- Use online notes/ study guide, T- Chart, Review sheet etc… Make Flash Cards

Do Now: (6 Minutes)Agenda- Write Homework- Take out Section 1 Review

Sheet.Get your and a Lab partners Lab JournalReview Homework Answers with a partner

Section 1 Review….1.Atom2.Compound3. Solution4.Chemical Reaction5.Precipitate6.Mixture7.Chemical Bond8.Molecule9.Element10.Chemistry

Event Observable Changes

Type of Change

Baking a Cake Color becomes golden brown- gooey liquid to crumbly solid

Chemical

Burning a log Color turns black, changes from wood to dusty ashes

Chemical

Freezing water Color becomes cloudy white, changes from liquid to solid

Physical

Conclusion Questions- Record in Journal

1)Using your observations- What evidence do you have that a chemical reaction took place when you added the alka-seltzer to the water?

2) Describe how you think this experiment relates to the Law of Conservation of Mass? (What were your results?)

3)Write your own definition of the law of conservation of mass.

4)What is another experiment you could think of doing that could produce similar observations?

A Chemical reaction occurs when substances go through chemical changes

The reaction cannot be reversed to return the two original substances through a physical process.

Like scrambling the letters of a word to make new words.