How are the components of a homogeneous mixture distributed

If 21.2 kcals of energy is released by this reaction, how many kj does the reaction release? (1 cal 4.184 j)

Polly is pushing a box across the floor with a force of 30 n. the force of gravity is –8 n, and the normal force is 8 n. which value could describe the force of friction if polly could not move the box?

Your town is considering building a biodiesel power plant describe at least two advantages and two disadvantages