Yvette mixed together water with calcium chloride in a beaker. She noticed that the temperature changed from 21oC to 37oC. She also noticed small solids starting to form in the beaker. What type of change occured? Explain how you know.

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.)

Afusion reaction takes place between carbon and another element. neutrons are released, and a different element is formed. the different element is a) lighter than helium.b)heavier than helium.c)the same weight as helium.d)dependent on the element that reacted with carbon.

Why does ammonia, nh3, behave as a base when it reacts with an acid? z