Given the enthalpies of reaction below, determine the enthalpy change for the reaction: n2o (g) + no2 (g) 3no (g). n2 (g) + o2 (g) 2no (g) δh = +180.7 kj 2no (g) + o2 (g) 2no2 (g) δh = -113.1 kj 2n2o (g) 2n2 (g) + o2 (g) δh = -163.2 kj a. 155.6 kj b. 130.6 kj c. 311.3 kj d. 65.3 kj

What phase of matter has particles that are held together but can flow past each other and takes the shape of a container, filling it from the bottom up?

If a 12-v battery is connected to a circuit that has a current of 3.0 a, what is the total resistance in the circuit? 36 ohms 4 ohms 0.25 ohms

1)each group 16 element has how many valence electrons? ( )4 ( )6 ( )8 ( )16 2)how many dots appear in the dot structure for calcium ion, ca2+? ( )zero ( )one ( )two ( )eight 3) which of the following atoms forms a cation to obtain an octet of outer shell electrons? ( )magnesium ( )oxygen ( )fluorine ( )helium 4) an al3+ ion contains 13 protons and 10 electrons. ( )true ( )false 5) valence and non-valence electrons are represented in lewis dot structures. ( )true ( )false