Scientific investigations most often start from observations of the natural world and which of the following? Models, computers, variables, questions

What existed originally that bacame the deposits of fossil fuels? A. vast amounts of plant life that existed before dinosaurs B. plants that died a few thousand years ago C. the dinosaurs D. lots of tiny mammals from the time before dinosaurs

Which characteristic of a company suggests that it has an informal work culture

If you were going to build a system to check the effectiveness of automobile catalytic converters on cars, what substances would you want to look for in the car exhaust?

Solo necesito saber como es el orbital del azufre

41Ca decays by electron capture. The product of this reaction undergoes alpha decay. What is the product of this second decay reaction? 41Ca decays by electron capture. The product of this reaction undergoes alpha decay.

Identify the spectator ions in the following complete ionic equation. 2k (aq) s2 - (aq) pb2 (aq) 2no-3 (aq) →pbs (s) 2k (aq) 2no-3 (aq) express your answers as ions separated by a comma.

4. A bird left its post and flew in a triangular path. It flew 21 yards south, 72 yards east and 75 yards diagonally to end back at the post. Is it a right triangle?

Condension occurs in the inside of your windows in Winters, why?

How can you use Hess's law to determine a reaction's enthalpy?

7. How much energy in KJ is released when 15.0 g of steam at 100.0 degrees Celsius is condensed and then frozen to ice at 0.0 degrees Celsius?