PLEASE HELP ME ASAP THIS IS DUE IN 10 MINUTES AND I AM STUCK!! For an investigation, a student records data about four unknown substances.

Picture 1: In comments...

The student then calculates the densities of the unknown substances and compares them with the table of densities of known substances shown below.

Picture 2: In comments

Which unknown substance is most likely carbon?

A. Substance 1

B. Substance 2

C. Substance 3

D. Substance 4

What are the concentrations of hydroxide and hydronium ions in a solution with a ph of 10.2?

Does anyone know a lot about how to: - calculate mass of magnesium metal - calculate the actual yield of magnesium oxide - calculate the theoretical yield of mgo - calculate the percent yield of mgo - determine the percent yield of mgo - determine the average percent yield of mgo i had to do an online lab and its asking these questions but i have no idea where to start or how to be able to find these things. i can post the chart of the data from the lab or if you can tell me exactly how i can find each.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat