2) Describe the purpose of a calibration curve and how one was used to find the concentration of phosphate in the unknown. 3) Why is distilled water, and not tap water, necessary for the preparation of all solutions in this experiment? What could be the problem if tap water was used for the preparation of the standards?

How many joules of heat are absorbed to raise the temperature of 650 grams of water from 5.00c to it's boiling point, 100c

Which of these properties, used alone, would be least useful in identifying most minerals? a. color b. luster c. streak d. density

Write a brief passage describing a neutral atom of nitrogen-14 (n-14). describe the number of protons, neutrons, and electrons in the atom, where each type of particle is located, and how the terms atomic number, mass number, and atomic mass are related to the particles. use the periodic table to you. 14 protons and eletrons since its a neutral atom