Me
you will earn 50 points if you answer it correct.
1. which of the combinations in the lab activity had indications that a chemical change occurred? defend your argument with evidence.
2. which of the combinations in the lab activity had indications that a physical change occurred? defend your argument with evidence.
3. are all physical changes reversible? explain your answer using an example you've observed in your everyday life.
4. give an example of something you've observed in your everyday life that is a chemical reaction. how did you know it was a chemical reaction?

answer:

what is the lab activity?

explanation:

1. the combinations were probably of opposite energy levels and were probably not good with each other.

2. it depends on what the combinations were.

3. yes, like ice melting into water. you can freeze the water and it will become ice again.

4. an example of a chemical reaction is wood burning. i knew that it was a chemical reaction because the wood was being turned into ash and would not be able to turn back to its original state.

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :