Which of the following statements is true? A. Sound waves create areas of high and low pressure.
B. Areas of high pressure are called compressions.
C. Areas of low pressure are called rarefactions.
D. All of the above.

Sound waves are longitudinal waves in which particles travels along with the direction of wave and hence creates regions of high pressure and low pressure also known as compressions and rarefactions.

So, the correct Option will be :

=》D. All of the above.

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

la respuesta es si te gusta hacer lo que siempre haces cuando nunca ves a alguien en el espejo porque sabes que no siempre están ahí.