I've put in some of the answers.
hope this helps :)
<span>Because its a Chemical combination of 2 different pure Elements, it's a Compound. </span>
It’s the second one, crest.
Crest is a section of wavelength.
The reaction between sulfuric acid, H2SO4 , and the base sodium hydroxide, NaOH , is a neutralization reaction. Na2SO4 is the salt sodium sulfate. ... For example, the reaction you've chosen is an acid-base reaction (also known as a neutralization reaction).