Why does liquid water have a higher specific heat than ice or water vapor?     a Liquid water is more dense than ice. For that reason, there are more particles to heat in the same volume of water than there are in ice.   b In liquid water, energy is required to break hydrogen bonds and also to increase the kinetic energy of water particles.   c In liquid water, energy is required to form covalent bonds. Water then turns into H2 and O2 gas, which is water vapor.   d Liquid water reacts more easily with the environment, so it gives off heat more readily than ice or water vapor.

Which diagram shows the change in potential energy as two atoms approach each other and why does the potential energy change in the way shown? 2. to 1. PE PE PE r because 4. The atoms are moving toward each other against the repulsive force that exists between them. 5. The atoms are moving toward each other with the attractive force that exists between them. 6. The atoms initially attract each other, but repel upon becoming too close together. O 1 and 4 O 2 and 6 O 3 and 5 O 2 and 4 O 3 and 4 3.

How much heat, in joules (J), must be added to a 75.0-g iron block with a specific heat of 0.449 J/g °C to increase its temperature from 25 °C to its melting temperature of 1535 °C?

5. Explain the direction in which heat energy will flow in the picture shown to the left.