Help me answer this question from my text book?

Question

I read these question from my textbook( trying to learn something new , not homework) but i don't know anything about them, help me out ok?
1> What gas fills the bubles that are released from the ALkaSeltzer tablet?

2> Is it possible, when baking, to abserve both chemical and physical changes? Provide and example.

3>Will an unlimited amount of Kool_aid mix dissolv in the given volume of water?

Answer 1

Not homework? Sure...

Answer 2

I'll just give you the first one, then offer help on how to figure out the others.

One of the active ingredients in Alka Seltzer is bicarbonate of soda. The bubbles are carbon dioxide, the same as bubble in soda pop.

Re: the baking question. Observe the qualities of bread dough before baking. Color, texture, weight, etc. Observe the qualities after. Did any changes occur to the original qualities?

You can do an experiment with Kool Aid to find the answer to the last question. Take a small amount of water. Measure a bit of Kool Aid into it. Stir until all the solid particles are dissolved. Measure in a bit more, continuing to stir until dissolved.

IF there comes a point at which the solids refuse to dissolve, then you know that there IS a limit. With any soluable (dissolveable) material, the point at which no more can be dissolved is it's saturation point.

Answer 3

OK, I believe you

1) probably carbon dioxide

2) Chemical - the release of CO2 from yeast making bread rise.
Pysical - ? Water turning to steam?

3) No, eventually, you would get to a saturated solution.

Answer 4

1) I don't know.
2) You can observe physical changes for sure
3)No, Kool-aid will dissolve, (It is mainly sugar) until it reaches a saturation point. Then you can heat it to get more to dissolve, I think that it is called super-saturation.

Answer 5

1. I think Co2 not sure
2. Cake, you see gas bubbles in the cake, and you also see it rise and turn color.
3. No, there will be a saturation point reached