Which of the following is used in pencils a. graphite b. silicon c. charcoal d. phosphorus

Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

If a polyatomic ionic compound has gained two hydrogen ions, then how does its name begin?

Summarize possible ways in which phases of matter could combine to form a solution.