A student places a ball on the ground and kicks it hard. The -ball moves along the ground. Which statement is true?

7. what temperature is need to just dissolve 50 g of nh4cl in 75 g of water? '

650.j is the same amount of energy as? 2720cal1550cal650.cal2.72cal

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.