This equation indicates that the reaction gives off heat. What is this type of reaction called? 2C4H10 + ? O2? 8CO2 + 10H2O + heat

a. an exothermic reaction

b. an endothermic reaction

c. absorption reaction

d. precipitation reaction

Which of the following elements is most likely to have an oxidation state of + 2

Which is heavier - an equal volume of water or gasoline?

4.8 kg of sulfur dioxide contains how many molecules?

The names of the compounds FeS, NaCl, NaOH, and Pb (CN) 2 all end in the suffix a. - ide. b. - ite. c. - ate. d. - ic.

Which of the following could be considered a scientific statement? I believe there is life on other planets. I observed that bees prefer red flowers. I think cake tastes much better than cookies. I consider yellow a cheerful color.

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?