How much heat, in joules, must be added to a 29.9 g iron block with a specific heat of 0.449 J/g °C to increase its temperature from 17.7 °C to 579 °C?

The drawing represents the movement of particles in a substance. what changes of state can this substance undergo

100 grams of molten lead (600°c) is used to make musket balls. if the lead shot is allowed to cool to room temperature (21°c), what is the change in entropy (in j/k) of the lead? (for the specific heat of molten and solid lead use 1.29 j/g⋅°c; the latent heat of fusion and the melting point of lead are 2.45 × 104 j/kg and 327°c, respectively.)

Light waves can move through , but they travel fastest when they move through a(n) .