Sulfur bonds with Beryllium in an ionic bond to create the stable compound Beryllium Sulfide. After the bond occurs, what is the charge of the Sulfur ion? A. -1 B. 1 C. -2 D. 2
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Sulfur bonds with Beryllium in an ionic bond to create the stable compound Beryllium Sulfide. After the bond occurs, what is the charge of the Sulfur ion?
A. -1
B. 1
C. -2
D. 2
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- 2. A sodium chloride molecule has an Na-Cl distance of 236.1 pm (recall 1 pm is 10-12 m.) In this ionic molecule, the effective charges of the ions are +1.3x10-19 C for the Na and -1.3x10-19 C for the Cl (the charge is a little less than the charge of an electron because the chlorine doesn't remove the electron from the sodium completely, sharing it just a little bit.) 2 A* a. b. C. d. e. 1mm Na Cl 1mm Find the dipole moment of the NaCl molecule. What is the magnitudes and directions of the electric force on a proton placed at each of the locations of the test points, A and B? *B What is the magnitude and direction of the electric force on the molecule and due to a proton placed at test point A? How large (magnitude) is the potential difference between two points in line with the molecule, as shown below, where point A is 1 mm from the Na and point B is 1 mm from the Cl? Is the potential higher at A or B? Provido physicaA compound containing An+ cations and XO4- anions crystallizes in a cubic lattice. The Ant cations are situated on the unit cell corners; the XO4 lons are centered on the face centers and at the body center. What is the charge on the cation, A**? A. A, +1 C. +2 B. +3 D. +4Materials with valence electrons fewer than four electrons are generally conductors. Why is it? a. (The answer cannot be found on the other choices.) b. For materials with fewer than three valence electrons, less or insignificant electric field is produced in the conductor. This is the reason why the electric field inside a conductor is zero. c. Originally, these materials have eight valence electrons. Greater than four of these valence electrons became free electrons and fewer than four valence electrons remained. This is why conductors have more free electrons at room temperature. d. Valence electrons in these materials need less energy gap is needed to be overcame to dislodge them from their parent atoms to become free electrons. Hence, conductors have overlapping conduction and valence bands.
- ny If the bonding energy, in terms of (r), between two ions is (2-1), x and y are constant and n is an integer number. a) Find the repulsive and attractive forces between the two ions. b) If the bonding energy between the two ions at the equilibrium state is given as Find the smallest distance between the two ions to achieve the state of equilibrium. ny. 2) 1-nThe surface of an ideal molecule of table salt (NaCl) is a square with a chemical structure as shown in the figure. The blue spheres represent Na+ ions and the green spheres represent Clions. Consider only points A, B, C, and D. What is the magnitude of the net electrostatic force on the chlorine ion at point A due to the sodium ions at points B and C? Note: the bond length is 0.282 nm. N D A C3. The potential energy of two particles in the electrostatic field when they are separated by a distance r is given by α В -- + 4/8 r 78 U = -- + where a and ẞ are constants. At what separation will they form a stable compound?
- P-type semi conducting material is Select one: a. holes are majority charge carriers and it is due to addition of trivalent impurities. O b. electrons are majority charge carriers and it is due to addition of trivalent impurities. O c. holes are minority charge carriers and it is due to addition of pentavalent impurities. Od. electrons are majority charge carriers and it is due to addition of pentavalent impurities.The repulsive force between Na+ and Cl- ions can be written as F = Be-T/R where B = 5.45 x 10-6 N and R = 0.321 Å. At equilibrium, this force is equal to the magnitude of the attractive force given by F Determine the value of r at equilibrium. e² 4π€or²Describe the following in your own words. a. van der Waals forces a.1 dipole-dipole interaction a.2 dipole-induced dipole interaction a.3 dispersion forces b. ion-dipole interaction c. H-bonding
- If there is one free electron per atom of copper, what is the electron number density of this metal?42. One gram of copper has 9.48 x 104 atoms, and each copper atom has 29 electrons. a. How many electrons are contained in 1.00g of copper? b. What is the total charge of these electrons?2. Describe the following in your own words. A.van der Waals forces a.1 dipole-dipole interaction a.2 dipole-induced dipole interaction a.3 dispersion forces b. ion-dipole interaction c. H-bonding