The Lewis dot model of a molecule is shown. A visual diagram of a CH2O molecule is shown. Carbon is the central atom with two horizontal lines connecting to the oxygen atom on its right. The oxygen atom also has two pairs of dots around it. Carbon has two horizontal lines each connected to each of the two hydrogen atoms. Based on the model, which of the following is true? Oxygen is the least electronegative of the three atoms. Carbon has a total of four bonded pairs of electrons around it. Oxygen has four pairs of non-bonding innermost shell electrons. Carbon has an incomplete octet as it transfers an electron to each hydrogen.

What is the density of the black hole

Two nitro no2 groups are chemically bonded to a patch of surface. they can't move to another location on the surface, but they can rotate (see sketch at right). it turns out that the amount of rotational kinetic energy each no2 group can have is required to be a multiple of ε, where =ε×1.010−24 j. in other words, each no2 group could have ε of rotational kinetic energy, or 2ε, or 3ε, and so forth — but it cannot have just any old amount of rotational kinetic energy. suppose the total rotational kinetic energy in this system is initially known to be 32ε. then, some heat is removed from the system, and the total rotational kinetic energy falls to 18ε. calculate the change in entropy. round your answer to 3 significant digits, and be sure it has the correct unit symbol.

You are making a solution of calcium chloride dissolved in water. you add solid, stir, and it dissolves. you add just a spatula tip full, stir, and the solid does not dissolve. how could you describe the solutions before and after adding the spatula tip amount