Select all of the following that are physical changes A. turning a tin can into aluminum foil B. breaking a window into very tiny pieces C. photosynthesis D. iron rusting and breaking apart E. crushing a can F. melting a can

Which type of bond is present in hydrogen sulfide (h2s)? the table of electronegativities is given. a. hydrogen b. ionic c. nonpolar covalent d. polar covalent

Nitrogen (n), phosphorus (p), and potassium (k) are the main nutrients in plant fertilizers. according to an industry convention, the numbers on the label refer to the mass percents of n, p2o5, and k2o, in that order. calculate the n: p: k ratio of a 30: 10: 10 fertilizer in terms of moles of each element, and express it as x: y: 1.0.

How will the emission of an alpha particle affect the atomic number of an atom