Select all that apply.
A beta particle:

-is electromagnetic energy
-is an electron
-has zero charge
-is emitted from the nucleus
-has a +2 charge
-has a -1 charge

Which of the following is always a reactant in a combustion reaction? oxygen nitrogen hydrogen carbon

Which of the following is true for the actual yield of a reaction? it is always calculated as a ratio. it is the yield from the excess reactant. it is the yield from the limiting reactant. it is always less than the theoretical yield.

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.