This equation indicates that the reaction gives off heat. what is this type of reaction called?
c3h8 +? o2 → 3co2 + 4h2o + heat
a.
synthesis reaction
b.
decomposition reaction
c.
endothermic reaction
d.
exothermic reaction

adding a(n) to an electric circuit would increase the magnetic field around a wire;

b. solenoid

a solenoid is a type of electromagnet whose purpose is to generate a controlled magnetic field.

if the purpose of the solenoid is instead to impede changes in the electric current, a solenoid can be more specifically classified as an inductor rather than an electromagnet.

the earths atmosphere is made up of nitrogen and oxygen. solids can turn into gasses through a process called sublimation. sublimation is the transition of a substance directly from the solid to the gas phase, without passing through the intermediate liquid phase.

hope this : d