In what type of reaction or process does heat flow into the system?
A. Combustion
B. Exothermic
C. Condensation
D. Endothermic

D. Endothermic

Explanation:

Exothermic = heat is flowing out

Endothermic = heat is flowing in

Condensation = water collecting in droplets on the surface of something

Combustion = the process of burning something

The correct answer is D. endothermic

Explanation:

Endothermic reactions are those that absorb energy in the form of heat. Energy is the ability to perform a job or to produce heat, and chemical reactions involve a rearrangement of atoms between substances with rupture or formation of chemical bonds. By consuming energy, the products obtained have higher energy levels than the initial reagents, since they have taken part of the heat of the environment.

In summary, an endothermic reaction is that chemical reaction that, when it occurs, consumes energy, that is, the products obtained have greater energy than the initial reagents, since they have taken part of the heat of the environment.

c. because step up transformer steps up the input voltage i.e increases the input voltage  

the number of turns are greater on the secondary side of step up transformer  

transformer does not handle dc current

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.