While performing a melting point determination on their purified salicylic acid a student observed through the MelTemp viewing window that the sample began to melt at 157oC. They then momentarily directed their attention away from the MelTemp device to their lab notebook in order to record the 157oC value. Upon returning to the MelTemp viewing window they see only liquid in the capillary tube and thus are unable to report the temperature at which the sample completed its melting. In response they decide to remove the capillary tube from the MelTemp, allow it to cool until the liquid re-solidifies, then repeat the melting point determination using the cooled capillary tube. Which one of the following statements is correct?
a. The student's response is following best practices
b. The student's response is not following best practices

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.

the correct answer would be b. amelia, because the particals of gas move really fast (charged particals) and gas also has a lot of room (particals move independently) so the only answer that has both of those is amelia's.

rosa was looking for patterns to predict the products of chemical reactions. she recorded three similar decomposition reactions in the table.she should record 2licl + 3o2.

in the last row of the table. it is the thermal decomposition of chlorate lithium, hence, she should record these products as: lithium chloride ( 2licl ) and oxygen ( 3o2 )   2 > 2 licl + 3o2.