A 53.6 g sample of iron metal is heated and put into 102.6 g of water at 16.3ºC in a calorimeter. If the final temperature of the iron sample and the water is 29.8ºC. What is the initial temperature of the iron sample when it was placed in the water? The specific heat of iron is 0.449 J/gºC.

24. a sports ball is inflated to an internal pressure of 1.85 atm at room temperature (25 °c). if the ball is then played with outside where the temperature is 7.5 °c, what will be the new pressure of the ball? assume the ball does not change in volume nor does any air leak from the ball a) 0.555 atm b) 1.74 atm c) 1.85 atm d) 1.97 atm

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.

What will most likely happen when two bromine atoms bond together?