Write balanced equations for the reaction of Mg(OH)2 with stomach acid (HCl). Express your answer as a chemical equation. Identify all of the phases in your answer.

Mg(OH)₂(s) + 2HCl(aq) > MgCl₂(aq) + 2H₂O(l)

Explanation:

Magnesium hydroxide is a white solid that is sparingly soluble in water. It is a basic hydroxide, therefore it neutralizes acids to form salt and water.

Magnesium hydroxide commonly used as an antacid, for example milk of magnesia,  because it reduces stomach acid, and increases water in the intestines which may induce bowel movements. It also relieves indigestion, sour stomach, and heartburn. Magnesium hydroxide is also used as a laxative to relieve occasional constipation.

The equation for the reaction between magnesium hydroxide and stomach acid, HCl, is as follows:

Mg(OH)₂(s) + 2HCl(aq) > MgCl₂(aq) + 2H₂O(l)

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

2b2t

explanation:

2b2t