Which of the following statements are true of nuclear energy and reactors? Check all that apply.

A. A nuclear reactor uses controlled fission reactions.

B. Nuclear reactors use uncontrolled reactions,

C. Nuclear fission reactions use only a small amount of material to
produce a large amount of energy.

D. Two tons of starting material are required for nuclear fission.

Which of the following statements concerning the influence of culture on ethnic identity formation is accurate? a. one will reject ethnic identity if cultural stereotypes are encountered. b. if one’s ethnic city is different from the dominant cultural group, then one’s ethnic identity you will become weekend. c. if an the ethnic group is excepted by dominant culture, then ethnic identity formation can be a difficult process. d. similarity to the dominant culture can determine how easy it is for one to except ethnic differences.

Predict whether the changes in enthalpy, entropy, and free energy will be positive or negative for the boiling of water, and explain your predictions. how does temperature affect the spontaneity of this process?

Suppose a lab group reports a ppercent yield of sand of 105. is it really possible to collect more sand than was originally represented? what is the possible explanation for the extra product?