Reggie and charlotte are baking oatmeal cookies. they dip the baked cookies in melted chocolate. the chocolate cools to form a hardened coating. reggie argues the entire chocolate-covered cookie has undergone a chemical change. charlotte disagrees, saying only the original oatmeal cookie has undergone a chemical change, not the chocolate coating. who is correct?

Alice added sodium chloride to water and stirred the water for several minutes. alice is most likely trying to demonstrate that ionic compounds a. are hard. b. can dissolve. c. are clear. d. can melt.

Choose the most likely outcome of this scenario: jen decided to go bike riding without a helmet. while no one is around during her ride, she is thrown from her bike when her wheel goes into a pothole. she is not injured, but she is terrified to get back on her bike. what happens next? a. her physical health is affected even though she wasn't hurt. b. her mental and emotional health are affected because she is afraid to get back on her bike. c. her social health is affected because she is worried her friends saw the fall. d. her overall health is not affected at all by her fall.

What is a neurotransmitter involved in mood reward, addiction, and motor behaviors?