Which pair shares the same empirical formula? (4 points) a
C2H2 and C6H6

b
C2H2 and C2H4

c
CH2 and C6H6

d
CH and C2H4

Write the chemical symbols for three different atoms or atomic cations with 27 electrons. asap!

Aglow stick contains a glass vial with chemicals. when the glow stick is bent, the vial breaks and the chemicals react to produce a glow. a science student observes that a glow stick kept in the freezer glows for a longer duration than a glow stick kept at room temperature. what conclusion can be drawn based on the observation? be sure to note the outcome and test variables in the conclusion.

An animal cell loses the ability to convert energy stored in food to energy that the cell can use. which of the cell's organelles has stopped working? a.the mitochondria b.the nucleus c.the vacuoles d.the endoplasmic reticulum