14. a test tube containing 4.00 g of iron and 2.40 g of sulfur was
heated in a manner similar to that of the copper-and-sulfur
experiment. before heating, the total mass of the tube and con-
tents measured on the balance was 36.50 g. after heating, the
mass was measured again. the mass of the tube and contents
was 36.48 g.

a. do you think it reasonable that mass remained the same was
conserved during this experiment?

b. what additional steps would you take to increase your confi-
dence in your answer to part (a)?

Ionic compounds can be readily dissolved in water because the high dielectric constant of water screens and decreases the force between the oppositely charged ions.

By examining a wave’s pattern after it interacts with a barrier or gap, measurements can be made to better understand certain wave phenomena. what is a broad question you can answer by doing this experiment?

4.at 0 ºc, some amount of energy is required to change 1 kg of water from a solid into a liquid. if you had a 2 kg piece of ice, what effect would this have on the amount of thermal energy required to change the water from a solid to a liquid? it would require more energy to change solid water into liquid water because there are more molecules in this larger piece of ice. it would still require the same amount of energy to change solid water into liquid water because the entire piece of ice would still gain the same amount of energy in each case. it would require energy to be removed from the 2 kg piece of ice. the larger piece of ice already has more total energy than the smaller piece of ice, so energy must be removed for the ice to become liquid. it would require less energy to change solid water into liquid water because the energy would spread through the ice more quickly and the ice already has a larger total amount of energy because it is larger than a 1 kg piece of ice.