Question

PLEASE HELP !


A group of students do an activity with baking soda and vinegar.The steps of the
activity are listed below:
1. Pour 100 g vinegar into a flask.
A flask looks like this.
2. Measure the temperature of the vinegar.
3. Add 10 g of baking soda to the flask.
4. Observe as the contents of the flask fizz (produce bubbles).
5. Measure the temperature of the contents in the flask and observe any change in temperature.

Answer 1

a. Describe one piece of evidence that a chemical reaction occurs when baking soda is
added to vinegar. (2 sentences required)
b. What should the total mass of all the products of the reaction be? Show your
calculations or explain your answer, and include units in your answer. (2 sentences
required)

Answer 2

After the fizzing stops, the students determine that the liquid in the flask has a
mass of 105 g. The students thought something was wrong.
c. Explain what property or law made the students realize their experiment was
incorrect. (2 sentences required)
d. How could the students change their experiment to make it more accurate?
Describe how the change the activity so that the total mass of all the products is
the value you calculated in part (b). Explain your reasoning. (2 sentences required)

Answer 3

As baking soda is added to vinegar, a colour change is noticed and effervescence is also noticed.

Answer 4

We could also observe vapour coming out as heat dissipation.

Answer 5

The total mass should have been 110g, 100+10

Answer 6

Thank you for helping! I've been stuck on this for a long time!! Do you happen to know what was wrong in the experiment? I'm terrible at Science..

Answer 7

Yes, to measure the best temperature change, they were suppose to place the thermometer in the solution as soon as they put baking soda in the vinegar, because the highest temperature is reached when there is effervescence. Plus they would make their conclusion inaccurate, bacause they would be basing from false temperature values.