Chemistry is the study of ________.
A) matter
B) transformations of matter
C) only microscopic phenomena
D) only macroscopic phenomena
E) both A and B
Question 2
Why does water not freeze at 0C when either ions or molecules other than O are present?
A) Molecules or ions dissolved in the water give the water molecules something else to easily bond with, thus allowing the solution to freeze well above 0C.
B) Molecules or ions dissolved in the water increase the number of water molecules at the solid-liquid interface, thus allowing for the rate of ice formation to increase at a temperature above 0C.
C) When molecules or ions are dissolved in the water, these solute molecules both take up space and inhibit the formation of the solid phase, thus lowering the freezing point temperature below 0C.
D) Molecules or ions dissolved in the water will sometimes raise the freezing point above 0C and other times lower it below 0C depending on the nature of these solute particles.
Dark Matter
Chemistry: basic skills
"Dark Matter"
Model of a sequential study in which two cohorts were followed beginning at age 20. One cohort was f
Gray Matter Development over the Surface of the Cortex
Microscopic Components of Osseous Tissue