Question

Can someone help me please. I'll fan and give medal.

Answer 1

what is your question ??

Answer 2

Well, i highly doubt it has anything to do with physics but I didnt know what to put it under. Its really long tho. Give me just a second.

Answer 3

okay

Answer 4

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.
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 each question in AT LEAST 2 OR MORE complete sentences for each question below. Make sure you use complete sentences and use your rubric to guide you.

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)

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)

Think you can help with A, B, C, and D?

Answer 5

a. 1. Change in temperature of the solution. 2. Dissolution of vinegar in the soda. 3. Formation of bubbles. Al the three are the evidences that there was a (chemical) reaction between vinegar and the baking soda.

b. NaHCO3(s) + CH3COOH(l) → CO2(g) + H2O(l) + Na+(aq) + CH3COO-(aq) is the equation for the reaction in the first stage. Then NaHCO3 + HC2H3O2 → NaC2H3O2 + H2CO3. And finally, H2CO3 → H2O + CO2. So the reaction ratio of the two reactants is 1:1. This implies that the whole 10g of baking soda will be consumed in the reaction. The same mass of vinegar will also be consumed. The remaining mass of vinegar will be 90g.
Despite this reaction taking place, the mass of the final products should remain 100g (of vinegar) + 10g (of baking soda) = 110g.
As you can see in the final equation, there is production of carbon (IV) oxide gas which escapes into air. This is why the student sees as though something is wrong when s/he finds that the total mass is less than 110g.
c. Carbon (IV) oxide produced is slightly less than air. Therefore, it is displaced and so it escapes to the atmosphere.
d. If the students have to keep the experiment as 'accurate' as they deem should be, the should not allow the produced gas to escape. They should thus collects either by tying a polythene bag to the opening of the container of the reactants or a downwards displacement method or any other suitable form of gas collection. The total mass should include the mass of the collected air.


I think I have answered more than three quarters of the question though defying instructions after each (the number of sentences required).