Decide whether each characteristic describes confirmation bias, selection bias, or both. CONFIRMATION BIAS/ SELECTION BIAS/ BOTH -a type of research bias
-based on a person's unintentional own beliefs -caused by poor sampling techniques during experimentation
-can affect the way a scientist interprets experimental results
-can be controlled, but never eliminated
-unintentional​

when [oh-] is 10-5  m, and [h3o+] is 10-9  m, the poh is 5 and ph is 9. again in both cases the sum of ph and poh is 14. however, the hydrogen ion concentration is not always going to be equal to exactly 1 x 10 raised to a negative number. for example, we skipped over the value of 2.0 x 10-7.

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.