The independent variables in Part I, the ones intentionally manipulated, are the
A. Mass and type of material
B. Temperature and volume
C. Density and gravity

The independent variable in Part II, the one that is intentionally manipulated, is the
A. Mass
B. Type of material
C. Temperature

The dependent variable for both Parts I and II, the one that you measure the response in, is the
A. Mass
B. Type of material
C. Temperature

3 hours because it is a decent distance.

it forms an anion that has a larger radius. anions have a negative charge and are larger than the original atom.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.