In the reaction __h2 + o2 → 2h2o, what coefficient should be placed in front of h2 to balance the reaction?
1
2
3
no coefficient is needed

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.

Omg imgonnafailnfiedkla use complete sentences to explain how the mass of hydrogen is conserved during cellular respiration.

What effect might melting sea ice have for people who live in coastal areas?