Which of the following is the best definition of a hypothesis? a. it is a scientific question that guides the direction of an experiment. b. it is a prediction about the formation of a scientific theory. c. it is a testable, possible answer to a scientific question. d. it is a way of answering a scientific question using the scientific method.

How many moles are in 7.2 x 10^23 carbon molecules? (*round to the nearest hundredth and include the unit "mol c" after your number) question 6 options:

The yearly amounts of carbon emissions from cars in belgium are normally distributed with a mean of 13.9 gigagrams per year and a standard deviation of 5.8 gigagrams per year. find the probability that the amount of carbon emissions from cars in belgium for a randomly selected year are between 11.5 gigagrams and 14.0 gigagrams per year. a. 0.340 b. 0.660 c. 0.167 d. 0.397

How do you know when a chemical reaction has occurred