30 points when carbon and oxygen combine chemically, the mass of the product is a) greater than the mass of the carbon plus the mass of the oxygen. b) equal to the mass of the carbon plus the mass of the oxygen. c) equal to the mass of the carbon. d) less than the mass of the carbon

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.

Which statement describes the phase change that occurs when dry ice is placed in an open container at room temperature?

Astudent conducts an experiment to determine how the amount of water given to a plant affects its growth. what is the independent variable for this experiment?