When a glow stick is crushed and shaken, the two liquids mix and the stick glows. Which statement is true?
A physical change has occurred, with energy being absorbed.
A physical change has occurred, with energy being given off.
A chemical change has occurred, with energy being given off.
A chemical change has occurred, with energy being absorbed.

Match the following vocabulary terms to their definitions. 1. amount of energy required to change 1 gram of material from the solid to the liquid state at its melting point 2. a measure of the kinetic energy of the particles of a substance 3. the amount of heat energy required to raise the temperature of 1 gram of liquid water from 14.5°c to 15.5°c 4. amount of energy required to change 1 gram of material from the liquid to the gaseous state at its boiling point 5. the amount of energy required to change 1 gram of a substance 1°c a. temperature b. latent heat of vaporization c. latent heat of fusion d. calorie e. specific heat

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Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?