One biologist believes that the dinosaurs were destroyed by floods. one astronomer believes that comets and meteorites which struck earth made dinosaurs extinct. which of these statements best explains why the biologist and astronomer have different views about dinosaurs? a. scientific views are influenced by the scientists' background. b. data gives different results when tested at different periods of time. c. data associated with natural phenomenon change from time to time. d. scientists working with different sets of data arrive at different results.

Option (D)

Explanation: The works of different scientist varies from one another. An astronomer deals with the study of the space including the galaxies and the entire solar system, whereas a biologist studies the about the different lives that exist on earth, their anatomy and the internal structure, and many more.

This scientists working at different fields, after doing research, obtains a certain sets of data that are different from one another. This is the reason why they give a different conclusion working with different different data set.

Thus, the correct answer is option (D).

answer

the ions in solute supperate from eachouthere

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g