Which reaction is endothermic?
a. hcl + naoh mc018-1.jpg nacl + h2o + 58 kj

b.6co2 + 12h2o + energy mc018-2.jpg c6h12o6 + 6o2 + 6h2o

c.2na + cl2 mc018-3.jpg 2nacl + energy

d.2c2h6 + 7o2 mc018-4.jpg 4co2 + 6h2o + 2,502 kj

Why should the scientific method be used to answer a question? a. it provides a way to test an idea without any bias. b. it provides a way to test a hypothesis. c. it provides a way to ensure all hypotheses are proven correct. d. it provides a way to quickly turn a hypothesis into a scientific theory.

Butadiene undergoes a reaction at a certain temperature in the gas phase as follows: 2c4h6(g) --> c8h12(g) the following data were collected for this reaction: time (min) [c4h6] (m) 0 0.36 15 0.30 30 0.25 48 0.19 75 0. determine the order of the reaction and the rate constant. 1st order and k = 4.3x10 -4 s-1 1st order and k = 2.3x10-4 s-1 2nd order and k = 4.3x10-4 s-1 2nd order and k = 2.3x10-4 s-1 zero and k = 4.3x10-4 s-1

Summarize possible ways in which phases of matter could combine to form a solution.