A 6th grade science teacher is trying to help a group of students understand how elements and compound differ. Which of the following statements would be best to use when illustrating these differences An element is like a piece of bread and a compound is like a sandwich

An element is like a forest and a compound is like an animal living in the forest

An element is like the mall and a compound is like the food court

Americium-241 undergoes fission to produce three neutrons per fission event. if a neutron-absorbing material is mixed in with this sample so that the rate of neutron production drops down to 1.8 neutrons per fission event, which will be effective at achieving a critical mass? check all that apply. remove a deflective shield surrounding the sample. remove absorbent material mixed in with the sample. compress the sample of americium-241.

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

The number to the right of an element's symbol (ex. c-12) identifies the of an isotope.