Magnesium is reacted with an excess of nitric acid, HNO3. 8.32 grams of hydrogen gas should theoretically be produced. What is the percent yield if only 7.26 grams of hydrogen gas is collected?

75 %
87.3 %
100 %
115 %

Combustion is the act or process of burning. therefore, i believe the answer is  a: burning wood. 

Qrepresents joules in the formula

Sink to the bottom. addition of potassium nitrate past it’s dissolution capacity at a particular temperature will cause the extra to just sink to the bottom of the glass.however, if you were to raise the temperature of the solution prior to dissolving it, and then slowly decrease the temperature after the dissolution, you would create a “supersaturated” solution - a solution that has more solute dissolved into it than should be allowed. if you add any extra solute past this, the entire solution would “crystallize,” and this is how you get those cool videos on youtube.

The independent is what is changed, the dependent is was is measured or the reaction.