Cuántas moles hay en ½ litro de agua​

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.

What is the percentage of hydrogen in c2h4

Describe at least two advantages and two disadvantages of using hydropower as a source of energy.