The electron–pair geometry of a molecule is tetrahedral. What is its bond angle if there are no lone pairs of electrons?

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?

The equation picture below shows which type of nuclear reaction u 235 + n x e 134 + sr 100 + 2n

Which statement is true about the model of the electromagnetic spectrum a: it change the frequencies of light. b: it compare wavelengths of light. c: the color of light waves can be changed using the model. d: the intensities of light waves can be decreased using the model.