Astudent 600 ml cup of cocoa gets cold. it was only 25°c. he put it in the microwave. how many calories must transfer to the cocoa to bring it up to 70°c

To get the answer, you must know first the formula for heat.

Heat = mass X specific heat X change in temp 

We know that the mass is 600

Specific heat is 1

And the change in temperature is 70 – 25 which is 45.

Now plugging in those values:

Heat = 600 x 1 x 45 = 27,000 calories

Note: calorie is a unit of heat

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.