Consider the statement: “The following report presents the results of our laboratory tests, which support the conclusion that our new
treatment for acne is safe and effective with minimal possible side effects."

What questions should a person ask themselves to determine if this scientific study is reliable?

O What does the acne medicine look like?
O What does the acne medicine smell like?
O Were laboratory tests conducted by the same company that produces the acne medicine?
O Were laboratory tests conducted in a laboratory with more than 100 employees?

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Answer asap need to be answered by wednesday morning explain how a buffer works, using an ethanoic acid / sodium ethanoate system including how the system resists changes in ph upon addition of a small amount of base and upon addition of a small amount of acid respectively. include the following calculations in your i. calculate the ph of a solution made by mixing 25cm3 0.1m ch3cooh and 40cm3 0.1m ch3coo-na+. [ka = 1.74 x 10-5 m] ii. calculate the ph following the addition of a 10cm3 portion of 0.08 m naoh to 500cm3 of this buffer solution. iii. calculate the ph following the addition of a 10cm3 portion of 0.08 m hcl to 200cm3 of the original buffer solution.

•what conclusions can you make about the relationship between the volume of a gas and its temperature? • what conclusions can you make about the relationship between the volume of a gas and its pressure? • what possible variables have you not accounted for? as you did the procedures, is it possible that the atmospheric pressure may have changed? if it did change over the course of your experiment, then how would your results have been affected?