What led to a change in the number of officially classified planets in 2006? 1. Scientists determined that some inner planets are too small to be considered spherical.
2.Scientists determined that Pluto does not orbit a star.
3.Scientists determined that the dwarf planet Eris should be included.
4. Scientists determined that Pluto does not clear its orbit of other objects.

Which of the following are good traits of a hypothesis? it will be able to be testedit can predict an outcomeit will explain the observationsall of these

8.98 dm3 of hydrogen gas is collected at 38.8 °c. find the volume the gas will occupy at -39.9 °c if the pressure remains constant.

3.09 lab: reaction of metals 1 which combinations of substances resulted in a chemical change? for each metal that participated in a chemical change, write the type of metal it is, based on your examination of the periodic table. were there any metallic compounds that did not react with either the acid or the base? write the type of metal, based on your examination of the periodic table. make a general statement about the reactivity of the metals in this experiment.