Based on your observations of the laboratory assignment(s) that produced gases, can you conclude that the same gas was produced in each assignment? Briefly explain.

With the use of same chemicals, same gas will be produced while the use of different chemicals, different gases will be produced.

Explanation:

The same gas was produced in each assignment if the same chemicals are mixed with each other while different gases were produced in each assignment when different chemicals are allowed to mix. If every time, same chemicals and same concentration of chemicals are mixed together, the result will be the same means production of same gas but if different chemicals are allowed to mix, then the product will be the production of different gases.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

може ли да зареждате повече информация, моля