H2(g)+ Cl2 (g) --> 2HCI(g). H = "-185kj." 2H2(g)+O2(g) --> 2H2O (g). H= "-483.7" kj. calculate angle H for the reaction: 4HCI(g) + O2(g)0. wCI2(g) + 2H2O(g)

Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)