The wavelength of visible light varies from 380 nm to 750 nm as the color of the light changes from violet to red. Calculate the energy of a photon whose wavelength is 6.8e-07 m.

Melting and boiling are endothermic processes. this means that these processes absorb energy from their surroundings in order to occur. use this information and the data you collected in the phase change gizmo to describe what happens to the temperature of water when you boil it, then explain why this result occurs.

When balancing a chemical equation:

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g