Lab

Reactions Lab

Luka Luketic
Marko Bulatovic
11/29/2011

The guiding question: How does the temperature of the reactants affect the amount of the reactants remaining after the reaction ( size of the reaction) ?

Hypothesis: The amount of the reactants remaining after the reaction will decrease as the temperature decreases as well, this means that the colder the reactants are the less of them will be left after the reaction.

List of the Materials:

Baking soda

Vinegar

microwave

cup

ruler

thermometer

CONTROL The reactants (eg.baking soda and vinegar)
VARIABLE: Temperature of reactant (vinegar) measured in degrees Centigrade.
RESPONDING A change in the amount of reactants remaining, I am hoping that it will increase as the temperature does .
Procedure

1: Prepare all of the needed materials

2: Measure the temperature of the vinegar without heating it or cooling it.

3. Add ¼ of a cup of baking soda to the vineagar

4. Write the observations down

5. Repeat all the steps, only heat up or cool down the vinegar

RECORD & ANALYZE

Normal temperature: 19 degrees Celsius

• 25ml of vinegar at the beginning

• The reaction erupts

• It over flows
• it turns fuzzy and bubbly
• at the end there’s 15ml of vinegar

When hot:70 degrees Celsius

• vinegar at the beginning: 25 ml

• rapidly overflows
• erupts
• lasts shortly
• vinegar at the end:16ml

When cold: -2 degrees Celsius

• vinegar at the beginning: 25ml
• it quickly overflows
• bubbles up
• lasts shortly
• vinegar after: 12ml

Data Tables: Showing the temperature, the amount of reactants prior to the reaction and the amount of reactions after the reaction.

Temperature ml at beginning ml at the end

19 C	25ml	15ml
70 C	25ml	16ml
-2 C	25ml	13ml

Analysis of Data:
Marko :The patterns I notice in this experiment is that at the end of each reaction the temperature difference between the reactants(vinegar) did not affect how much milliliters stayed, you do notice that the colder it is the more liquid disappears, but it’s not a big difference. I do think this data is believable and trustworthy because we tested the reactions more than once, and we’re sure they work.

Conclusion: We experimented and researched how How does the temperature of the reactants affect the amount of the reactants remaining after the reaction ( size of the reaction). We examined the reactions at room temperature, at cold temperature and at cold temperature, using this information we discovered that, the difference is not so big, but actually the speed of the reaction, and how fast it’s over. The difference between the variables was A change in the amount of reactants remaining. I conclude that the temperature doesn’t affect this reaction a lot, when it’s colder two more milliliter's come out. But we found out at extreme temperatures, such as really cold or hot reactions, happen faster, and last for a short period of time. My prediction was not correct, The colder i is the bigger the reaction will be, not a lot bigger, only a couple milliliters. Through this I learned that reaction at extreme temperatures, happen faster.

Further Inquiry:

During this experiment we could have made an error in the amount of vinegar and baking soda we added, and the amounts we had could have had an impact on our experiment. I Would weigh each of the reactants to be absolutely sure that the reaction is correct, and the temperature is the only reactant that is affecting the reaction at all times. My new Hypothesis is that, Colder liquids have short reaction times but in the end they have the most of the reaction outside of the cylinder.