In a Heating and Cooling Curve, what is occurring during the flat portions of the curve when the temperature is constant, and what is the energy being used to do?a) there is no energy being addedb) it is speeding up the particlesit is changing the phasec) it is increasing the kenetic energyd) it is decreasing the kinetic energy

examining the answers the correct one is B.  

Explanation:

In calorimeter there are two possibilities when adding energy to the system,

* energizes it is used to increase the temperature of the particles,

* energy is used to change state, in the latter case there is no increase in temperature, so the curve is flat

Therefore, in a temperature vs. energy curve, the flat parts correspond to changes in the phase, either by raising or lowering the temperature.

when examining the answers the correct one is B

answer: the rock sample is a sedimentary rock.

explanation:

it is given that:

mass of rock sample, m = 2.7 g

volume of rock sample,

so, density of rock sample will be

since, the density of rock sample is . hence, the rock sample is a sedimentary rock, whose densities varies between .