1. CO2 (s)  CO2 (g) 2. CH4 + 2O2  CO2 + 2H2O Warm Up p 46 Copy the following chemical equations into your notebook 1. CO2 (s)  CO2 (g) 2. CH4 + 2O2  CO2 + 2H2O Compare and contrast: read 3x….annotate with thoughts 1st read: The left side of equation 1 with the right side of equation 1 2nd read: The left side of equation 2 with the right side of equation 2 3rd read: Compare and contrast equation 1 and 2 Date Session # Activity Page # 11/6-7 18 Warm Up 46 Chemical Change Lab (formal grade) 47 Chemical Properties and Change Notes 48 Homework: Read: 41D-45D ?’s. 1-6 on 45D 69D-72D ?’s 1,2,4 on 76D

8.P.1 Understand the physical properties of matter and changes that occur when matter interacts in an open or closed container 8.P.1.3 Compare physical changes such as size, shape and change of state to chemical changes that are a result of a chemical reaction to include changes in temperature, color, gas or formation of a precipitate.

Warm Up 1. CO2 (s)  CO2 (g) CH4 + 2O2  CO2 + 2H2O Same molecule on each side of the equation Same elements on each side of the equation One side has solid CO2, the other side has gaseous CO2 This is a physical change….no bonds broken, no new material formed CH4 + 2O2  CO2 + 2H2O Different compounds on each side of the equation There have been chemical bonds broken, atoms rearranged, & new bonds and materials created

Objective TLW explain chemical changes by observing several experimental trials, identifying chemical change evidence, then complete an exit ticket.

Leader: runs directions, on task Materials: collects materials Lab Social Skill Card Social skill: on task Group Roles Leader: runs directions, on task Materials: collects materials Clean Up: monitors station & sink area Data: data table is properly completed by all group members You should rotate roles after each investigation. Part of lab grade will be the detail of your observations.

Leader: runs directions, on task Materials: collects materials Lab Social Skill Card Social skill: on task Group Roles Leader: runs directions, on task Materials: collects materials Clean Up: monitors station & sink area Data: data table is properly completed by all group members You should rotate roles after each investigation. Part of lab grade will be the detail of your observations.

quality observations teamwork describe how to make quality observations describe teamwork

Investigation 1 Send your materials member to the front with a Ziploc bag for the citric acid. Using the plastic spoon, place about ½ teaspoon of baking soda into the plastic bag that also contains the citric acid. Using your graduated cylinder, measure 10 mL of water. Add 10 mL of water to the plastic bag containing the citric acid and baking soda. Close the bag & mix the contents. Observe and record all the changes that occur. Send your clean up member to the front with the baggie and its contents.

Lab Sheet

Investigation 2 Send your materials member to the front for the hydrogen peroxide beaker. Pour the H2O2 (hydrogen peroxide) into an empty baggie. Raise your hand to signal you are ready for the next reactant. Wait for an assistant to add a scoop of yeast to the baggie containing the H2O2 (hydrogen peroxide). Quickly seal the baggie. Observe and record all the changes that occur Send your cleanup member to the front with the empty beaker the used baggie and its contents.

Investigation 3 Using your plastic spoon, measure approximately ½ teaspoon of baking soda. Place the baking soda into an empty baggie. Use the graduated cylinder to measure 10mL of vinegar. Add 10 mL of vinegar to the baking soda in the baggie and quickly seal. Observe and record all the changes that occur Send your clean up member to your designated sink to empty and rinse GRADUATED CYLINDER. Send your clean up member to the front to throw the baggie away.

Investigation 4 Send your materials member to the front to obtain your cabbage juice and Mystery Tubes. Use the pipette to add about 20 drops of cabbage juice to Mystery Tube A. Observe and record all changes that occur in Mystery Tube A. Place the test tube in the beaker so it doesn’t spill. Use the pipette to add about 20 drops of cabbage juice into Mystery Tube B. Observe and record all changes that occur in Mystery Tube B. Place the test tube in the beaker so it doesn’t spill. DO NOT CLEAN UP YOUR TEST TUBES, YOU NEED THEM FOR THE NEXT INVESTIGATION!! Send your materials member to the front to return the cabbage juice.

Investigation 5 You will be using both your Mystery Tubes A & B from Investigation 4 Holding the tubes over the LARGE beaker in your bin (to prevent spills), pour the contents of one tube into the other tube. Observe and record all changes that occur Send your clean up person to your assigned sink to empty and clean the test tubes. When you table and materials are clean, send your clean up member to the goggle cabinet to return your goggles.

CLEAN UP While your clean up member is making sure: dirty paper towels and the pipette need to be thrown away glassware, etc is clean goggles in the sanitizer restocking your bin, it should look like this: The rest of you need to make sure your data is complete and you are ready to move on.

P48 . Notes Chemical change: a change that occurs that causes the chemical makeup (composition) of a substance to change. Chemical bonds are broken and new ones created Evidence Precipitate Color change Temperature change (Exothermic & Endothermic) Gas produced Other (Light produced, odor) A chemical change is also called a chemical reaction

Highlight evidence in each investigation Highlight the evidence you recorded on your lab sheet that a chemical change occurred.

Notes (there’s more..) Some chemical changes release energy…heat, light, etc. They get warmer. These are EXOTHERMIC Some chemical changes absorb energy…they get colder. These are ENDOTHERMIC Go back to your lab results. Note if the reaction was endothermic or exothermic. Not all reactions are endothermic or exothermic.

Chemical Property P 48 . Properties that change the chemical nature of matter….chemical properties can only be observed or measured in a chemical reaction

Chemical Properties pH Reactivity Combustion/flammability Corrosion Rusting (Iron) Tarnishing (Silver, Copper, etc)

pH A measurement of how acidic (1-6) or basic (8-14) a material is

Reactivity How easily a substance undergoes a chemical change, or bonds, with other substances http://www.youtube.com/watch?v=9bAhCHedVB4

Combustion/flammability Rapid reaction with oxygen, produces heat & light Reactant + Oxygen ----> Oxide(s) + heat + light

Corrosion The gradual destruction (or deterioration) of a material as it reacts chemically with its environment. Corrosion is the primary means by which metals deteriorate.

Rusting A type of corrosion. Iron forms Iron oxide (rust) when iron reacts with oxygen and water. This process gradually destroys the entire sample of iron.

Tarnish another type of corrosion A thin layer of corrosion that forms over some metals. It only affects the outermost layer of the material. Unlike rust, the layer of tarnish seals and protects the underlying layers from reacting. Copper tarnish Silver tarnish

In your CLEAN tray…. Plastic spoon 3 baggies Graduated cylinder pipette Blank lab skill card Lab Directions Group role helper slips Paper towels Goggles into cabinet 3 baggies Large beaker 2 test tubes Water bottle Vinegar bottle Baking soda jar