I believe the answer is the first one <span>NaH</span>
Answer:
The reaction between the salt and water is endothermic.
Explanation:
The reaction is endothermic because the reaction absorbs heat and causes the surroundings to become cooler.
1)
Common salt= sodium, chlorine
Hydrated copper sulfate= copper, sulfur, water
Sulphuric acid=hydrogen, sulfur, oxygen
2)
Idfk
3)
a)Relative atomic mass is the average mass of an elements atoms(total number of protons and neutrons)
b)An isotope is a form of an element that has the same number of protons but different number of neutrons
c)idfk
Btw ur teachers name is hot
