1. What enthalpy change accompanies the reaction below? Is it exothermic or endothermic?[pay attention to the number of each type of compound]
2Al(s) + 3H20(1) - A1,0,(s) + 3H, Q)
Al=0
AL O, = -1675.7
H2O = -285,83
H₂ = 0

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

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.

The point along a planet's orbit where it is closest to the sun is called the