Early Work: March 2nd

1. Please grab a computer and go to my school district website.

2. Take out your hypothesis, procedure, and data from the vinegar and baking soda lab we did last class.

Chemical reaction

CH3COOH + NaHCO3 CH3COONa + H2O + CO2Acetic Acid and Sodium Bicarbonate Sodium Acetate and Water and Carbon Dioxide

•Does the total mass of the matter involved in the reaction change?•Can matter be created or destroyed during a chemical reaction?

Agenda: March 2nd

• Baking soda and vinegar reaction in depth• Check crystal formation project• Revise MSP practice

• Jordan and Isaiah watch a chemical reaction between baking soda (NaHCO3) and vinegar (CH3COOH).

• They noticed that combining the two reactants produced bubbles and they guessed that it was a gas being produced in the reaction.

• They wondered if there was a relationship between the amount of baking soda and vinegar and the amount of gas produced in the reaction.

• Write a testable question based on their observations.

• Jordan and Isaiah decided to investigate the following question:

• What is the perfect ratio of volumes of baking soda and vinegar that will fill a ziplock bag to capacity without bursting the bag open?

• What would be the variable you might use in the lab?

• Discuss with a neighbor your hypothesis based on the question above.

• Write a hypothesis and procedure and carry out the experiment.

• Materials:– Ziplock bag (needs to cleaned after every trial)– Baking soda– Vinegar– Graduated cylinder– Scale– Measuring scoop– Pipette – Paper towels

• Be sure to record data in your cornell notes.• Once you have collected data, write a conclusion.

Amount vinegar Amount Baking soda Result (burst, did not inflate)

100 ml100100ml100100100ml100ml100 ml100 ml100 ml40ml60ml70ml100ml40ml50ml60ml50ml70ml85808050 ml60 Ml90 Ml100 Ml

7.5 grams8 grams8.5 grams9 grams 6 grams20 grams5grams15 grams6 grams3.8 grams7grams10grams20grams42grams12.9g22.9g32.9gr3grams10grams30g303010 Grams40 Grams60 Grams100 Grams

inflatedBurstBurstBurstInflated, not popP0PPED !Inflated!! :DInflatedInflated:DInflatedAll inflated. Almost burst1.3 gas was product1.6 gas productpoppedinflatedInflatedInflated1SameExploded4grams1 gram0.5 G0.6 G0.8 GPOPPED ! O:

Write a conclusion

• Write a conclusion in the summary of your cornell notes.– Answer the testable question: What is the perfect ratio

of volumes of baking soda and vinegar that will fill a ziplock bag to capacity without bursting the bag open?

– Use supporting data.– Make a mathematical comparison.– Connect experiment to real world scenario.

• Go to Mr. Baur’s website and write final drafts of hypothesis, procedure, and conclusion.

Select a chemical, find a partner, get a computer.

• Alum: AlKSO4

• Borax: NaBO7

• Table salt: NaCl• Copper sulfate: CuSO4

• Sugar (sucrose): C12H22O11

• Epsom salts: MgSO4• Baking soda: sodium bicarbonate: CHNaO3

Crystal chemical research

• Common name and chemical formula• Common uses• Density• Melting and boiling pts• Solubility in water at 20 oC• Color• 3-D Arrangement of compound• Safety concernshttp://webmineral.com/http://www.chemspider.com/

Procedure

1. On a piece of tape, label a glass dish with the name of the chemical you will be using.

2. Pour 200 mL of hot water (80 degrees Celsius) into the dish.3. Weigh 50 grams of chemical into a plastic cup.4. Add chemical to hot water until dissolved. Stir until dissolved. 5. Find the mass of the remaining chemical in the plastic cup and

subtract it from 50 grams to find the amount of chemical you added. Tell this number to Mr. Baur.

6. Wrap a pipe cleaner or string around a pencil and place it on the top of the dish.

7. Crystals should form in the next few days as the water evaporates.