Calculate the de Broglie wavelength of an electron with a velocity of 5.0 x 10 -3 times the speed of light (3.0 x 10 8 ms).

The last valence electron in Br is 4p5. What are the quantum numbers for this electron. n is _______ l is  _______ ml is _______ and ms is _______

Write the expected short electron configuration for As. Leave 1 space in between each term. For example: nitrogen would be [He] 2s2 2p3

The last valence electron in V is 3d2. What are the quantum numbers for this electron. n is _______ l is  _______ ml is _______ and ms is _______

The specific heat capacities of three metals are given below. Metal Fe Pb Zn Specific Heat, j/g°C 0.470 0.130 0.388 If 1.00 gram of each metal is heated to 100 degrees celsius and added to 10 grams of water at 25 degrees celsius, what is the order of the temperatures of the final mixtures from the lowest to the highest?

Calculate ΔH° for the following unbalanced reaction using the data for the enthalpy of formation in the appendix. C2H2(g) + O2(g) –> CO2 (g) + H2O (g)

Given the enthalpy changes: A +B –> C ΔH= -35 kj/mol A + D –> E + F ΔH= 20 kj/mol F –> C + E ΔH= 15 kj/mol

Consider the reaction: B2H6(g) + 3O2(g) –>B2O3(s) + 3H2O(g)             ΔH = -2035 kJ Calculate the amount of heat released when each of the following amounts of diborane (B2H6) is burned A mixture of 20.0 g B2H6 and 10.0 g O2

Nitrogen has a greater first ionization energy than oxygen. What is the best explanation for this observation?

Five successive determinations of the density of an alloy gave the following results: 10.29 g/ml 9.95 g/ml 10.06 g/ml 9.89 g/ml 10.18 g/ml What value should be reported for the density of this alloy?