Select the star life cycle that is accurate? a. star of one stellar mass, red giant, planetary nebula, white dwarf o b. nebula, star of one stellar mass, supernova, black hole o c. supernova, star of three stellar masses, red giant, nebula o d. nebula, white dwarf, red giant, planetary nebula

In which layer of earth do most earthauakes occur a_ inner core b_outer core c_mantle d_crust

What does x represent in the formula for the compound xcl4?

Consider three unlabeled bottles, each contain small pieces of one of the following metals. - magnesium - sodium - silver the following reagents are used for identifying the metals. - pure water - a solution of 1.0 molar hcl - a solution of concentrated hno3 (a) which metal can be easily identified because it is much softer than the other two? describe a chemical test that distinguishes this metal from the other two, using only one of the reagents above. write a balanced chemical equation for the reaction that occurs. (b) one of the other two metals reacts readily with the hcl solution. identify the metal and write the balanced chemical equation for the reaction that occurs when this metal is added to the hcl solution. use the table of standard reduction potentials (attached) to account for the fact that this metal reacts with hcl while the other does not. (c) the one remaining metal reacts with the concentrated hno3 solution. write a balanced chemical equation for the reaction that occurs. (d) the solution obtained in (c) is diluted and a few drops of 1 m hcl is added. describe what would be observed. write a balanced chemical equation for the reaction that occurs.