A blue crystalline material is boiled in a test tube. A clear liquid condenses and the remaining crystals turn white. These observations are consistent with the hypothesis that the blue crystalline material are: a. A heterogeous mixture
b. An elementc
c. A wet saltd
d. A compound

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Ch4 and ph3 are both covalent since they are composed both of non-metals.    ch4 is non- polar because of  london forces and has a geometry of tetrahedral  ph3 , on the other hand, is umbrella shaped polar and has dipole-dipole intermolecular force (imf) . since ph3 is polar, it has a stronger imf   

Hello there,it will only be somewhat eroded (25%)hope this : ))~top

Looking up graphs on google, you can see thaty = force(n)x = time(s)