For the following chemical reaction, what choice correctly indicates the reactant(s)? Nickel + Iron (III) sulfide --> nickel (II) sulfide + Iron

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.

How does the presence of oxygen affect the chemical pathways used to extract energy from glucose?

Who examines and coordinates the cleanup of polluted sites?