Convert 6.86 km into m

Which substances have the lowest melting points: ionic covalent, or metallic

Calculate the expected ph values of the buffer systems from the experiments (a,b,c,d), using the henderson- hasselbalch equation, ph-pka+log[a-]/[ha]. use for pka values carbonic acid= 6.37, and acetic acid= 4.75.

Which of the following is not one of the steps in the scientific method a. hypothesize b. summarize c. analyze d. familiarize