When a white powder is added to a liquid in a beaker at room temperature, the beaker becomes too hot to touch. what kind of reaction is this an example of?
a. a fusion reaction
b. a combustion reaction
c. an exothermic reaction
d. an endothermic reaction

Harvey kept a balloon with a volume of 348 milliliters at 25.0˚c inside a freezer for a night.  when he took it out, its new volume was 322 milliliters, but its pressure was the same.  if the final temperature of the balloon is the same as the freezer’s, what is the temperature of the freezer? the temperature of the freezer is  kelvins.

Over the last 90 years, scientists have added to the body of evidence supporting the big bang theory. what is the latest piece of evidence discovered in 2014?

Which substance has non polar covalent bonds