Compounds are different than elements because compounds are– Group of answer choices

a pure substance; elements are not.

not able to be broken down into parts.

made from the same type of atoms.

combinations of two or more elements.

Which of these conditions most likely produces an unstable isotope?

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

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer