What substances are used as moderators in a nuclear reactor?

A. carbon and water

B. liquid sodium and water

C. plutonium and neptunium

D. cadmium or other metals

ansewer is A. carbon & water

What is considered to be one of the first series of events in the study of chemistry?

The atomic symbol 206 82 Pb represents lead-206 (Pb-206), an isotope that has 82 protons and 124 neutrons. Which atomic symbol could represent an isotope that undergoes radioactive decay to produce Pb-206? A. 238 92 U B. 222 87 Pb C. 178 72 Hf D.

The following chemical equation is balanced: CH2 + 0 * CO + H20 O True O False

The highest elevation Mt. Zembat in Alaska 40 years ago was measured at 7600 feet. Today the highest elevation is 7598 feet. What is the rate of change in elevation for this mountain?

What are the first two quantum numbers for the electrons located in subshell 4d?

Theo is skiing with his friends when he sees an avalanche warning sign. What type of hazard is this? A. Biological B. Chemical C. Social D. Physical

A red blood cell contains 4.0 107 free electrons. what is the total charge of these electrons in the red blood cell?

The coefficients in a chemical equation? A; show the valence electrons for each atom B; are the molar masses of the substances C; show the number of grams of each substance that react D; indicate the number of moles of each substance that react

In a hypothetical garden each of the identical trees consist of 11 branches and each on a tree consist of 35 leaves. How many trees would have 8,085 leaves?

If you were an energy source, which energy would you be? why?