Which of the following statements below is correct?
a. in the process of cooking a frozen pizza, only chemical changes occur.
b. both physical and chemical changes occur when you make pizza from scratch.
c. only chemical changes occur when you cook a frozen pizza and only physical changes occur when you make pizza from scratch.
d. you cause chemical changes in vegetables by cutting them into small pieces

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2