Since we know each element as a defined number of protons, we can also use that number to determine the number of electrons, assuming the element has no charge. Let’s write some out: ELEMENT NUMBER OF PROTONS NUMBER OF ELECTRONS C  A   B  O  C   D  Al  E   F  Na G  H  Si I  J

The “octet rule” in chemistry helps predict the types of bonds thatatoms will form. In general, an atom will be most stable if it fills itsouter shell of 8 electrons. Atoms with fewer than 4 valence electronstend to donate electrons and those with more than 4 valence electronstend to accept additional electrons; those with exactly 4 can do both.Using this rule, determine what category each of the followingelements falls into: N, S, C, P, O, H, Ca, Fe, and Mg. (You will needto work out the valence of the atoms.)

In an ESI spectrum, you see a peak at m/z = 1293.51. You know that peak corresponds to a charge of +10. What is the mass of the protein, in kDa? 14.4 33.6 O 12.9 15.8

Which of the following substances will have the greatest lattice energy? MgS NaF MgO CaO

The triple point of an element is at 75 torr and 125°C. This means that liquid is more dense than solid cannot exist at 1 atmosphere pressure cannot have a vapor pressure less than 75 torr cannot exist above 125 degrees Celsius What is the electron geometry (or electron arrangement) around an atom in a molecule or ion which is surrounded by three lone pairs of electrons and two single bonds T-shaped see-saw trigonal planar trigonal bipyramidal linear A red blood cell placed in pure water will swell because water moves from a higer osmotic pressure to a lower osmotic pressure the osmotic pressure is greater in the cell than in the water the osmotic pressure is the same in the cell and the water the somotic pressure is greater in the water than in the cell

100 90 NaNO 80 70 Pb(NO,)2 KNO3 60 СаCl 50 40 NaCI KCI 30 20 KCIO3 10 Ce,(SO,)3 10 20 30 40 50 60 70 80 90 100 Temperature (°C) When 50 grams of KCI is dissolved in 100 grams of water at 50 °C, the solution can be correctly described as: saturated supersaturated unsaturated Solubility (g of salt in 100 g H,O) K,Cr,O,

How many grams of glucose (C6H2O6 molecular mass =180daltons) would be present in one liter of a 1M (molar) solution of glucose?

A solution in which ["OH] = 6.3 × 10-/ M has a higher pH than a solution with a ["OH] = 4.3 × 10-2 M. True False

What is the total mass of oxygen in a single molecule of glucose? Express your answer in amu to 5 significant figures. HINT: Make sure your atomic mass for O has a precision of at least 5 sig figs; otherwise, your answe will not be correct. For example, do not use a value of 16 amu per oxygen atom for the atomic mass of O. That has too few sig figs.

What is the molarity of the following solution: 47g of KCl dissolved in enough water to give 375 mL of solution