PLEASE HELP Wich two changes of state can be caused by removing thermal energy from a
substance.
A. Deposition
B. vaporization
C. sublimation
D. condensation

Which element forms an ionic bond with flourine? 1) fluorine 2) carbon 3) potassium 4) oxygen

How can a give a full method for the experiment of separating sand from water by filtration? 1-materials 2-steps 3-conclusion also for water and salt separated by the evaporation or distillation process

The comparison of the number of atoms in a copper coin the size of a penny with the number of people on earth is made to illustrate which of the following? a. that atoms are indivisible b. that atoms are very small c. that atoms are very large d. that in a copper penny, there is one atom for every person on earth