Is spreading butter on bread a chemical change and if so what's the evidence?

Yes, spreading butter on bread is a chemical change. This is so because the butter chemicals become infused with the bread chemicals. Mostly why butter is soaked into bread

this is proven because even after the excess butter is removed, butter is still on/in the bread

hcl + naoh → h2o + nacl

explanation:

hcl + naoh → h2o + nacl   is the reaction that is correctly balanced.

however, pcl3 + h2 → ph3 +3hcl, 2ca+ 3cl2 → cacl3, and c5h12 + 5o2 → 5co2 + 6h2o are not correctly balanced.