Me skskskskkskskskskks an endothermic reaction releases more energy than it uses gives off heat to the environment releases less energy than it uses does not require activation energy

Seawater contains approximately 3.5%nacl by mass and has a density of 1.02 g/ml. what volume of seawater contains 7.5 g of sodium?

This classification of drug typically changes the brain's chemistry and reduces its ability to create its own endorphins.

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.