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The formula of a sodium containing compound is Na XY3 where X and Y are fictitious elements. What would be the formula if sodium were replaced by iron(III) ion? O a. Fe2XY3 O b. FeXY3 O c. Fez(XY3)2 O d. Fe(XY3)2 O e Fez(XY3)3
What should be the speed of a beam of particles of mass 1.025x10-27 g in order to have a wavelength of 6.37 nm? оа. 1.02 x 105 m/s ob. 9.66 x 104 m/s 1.18 * 105 m/s d. 9.89 104 m/s C O e. 1.25 x 101 m/s e
Marks The B-O bond order in BO3- is ... O a 1.33 because the correct Lewis structure features 1 B-O double bond and 2 B-O single bonds, O b. 1.00 because the correct Lewis structure features 3 B-O single bonds. O c. 2.00 because the correct Lewis structure features 3 B-O double bonds. O d. 1.67 because the correct Lewis structure features 2 B-O double bonds and 1 B-o single bond. O e. 1.50 because the correct Lewis structure features 1 B-O double bond and 1 B-O single bond
Which one of the statements about electrons and atoms is now considered INCORRECT? Mwen b. a. Pauli predicted that electrons could have wave properties Electrons have well-defined mass and charge, but their exact position is uncertain O c. Two electrons can be paired in the same orbital as long as they have opposite spins. O d. In each energy level above n=1, there are multiple regions of space an electron can occupy. Oе. Each energy level corresponds to a particular set of orbitals.
Man An empty, rigid container is filled up with a gaseous mixture of 10 kg of He and 10 kg of H2, at room temperature. Select the INCORRECT statement. O a. The number of moles of each gas is not the same. O b. The pressure inside the container will increase if the temperature increases O c. Hydrogen will have a higher partial pressure than Helium. O d. For molecules of both gases to have the same mean velocity, we would need to cool down the container with Ar. O e. He atoms will have higher average kinetic energy than H2 molecules.