Which of the following choices contains the most thermal energy? a penny that is 20 degrees Celsius ( oC)

an atom of aluminum that is 20 degrees Celsius ( oC)

a 50 milliliter (ml) glass of water at 20 degrees Celsius ( oC)

a 900 milliliter (ml) pitcher of orange juice at 20 degrees Celsius ( oC

List four observations that indicate that a chemical reaction may be taking place

Margaret wants to make an orange flavored drink by stirring powdered drink mix into a glass of water. she doesn't like drinks that have small clumps of powdered solid in them, so she wants the drink to be a perfect solution. what factors should margaret not consider when deciding how much powder to add to her glass of water?

When water dissociates, each water molecule splits into a hydroxide ion and a) h 3 o + b) a hydrogen atom c) a hydrogen ion d) h 2 o e) oh —