Which statement best describes the direction of heat flow by conduction between two samples of the same material?

1.heat flows from faster molecules to slower molecules when they are near.
2.heat flows from faster molecules to slower molecules when they collide.
3.heat flows from slower molecules to faster molecules when they are near.
4.heat flows from slower molecules to faster molecules when they collide.

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Achemistry student needs to standardize a fresh solution of sodium hydroxide. he carefully weighs out of oxalic acid , a diprotic acid that can be purchased inexpensively in high purity, and dissolves it in of distilled water. the student then titrates the oxalic acid solution with his sodium hydroxide solution. when the titration reaches the equivalence point, the student finds he has used of sodium hydroxide solution. calculate the molarity of the student's sodium hydroxide solution. be sure your answer has the correct number of significant digits.

Amixture with the same composition throughout is!