Identify the following as physical (P) or chemical (C) changes. 1. NaCl (Table Salt) dissolves in water.
2. Milk sours.
3. Ag (Silver) tarnishes.
4. Sugar dissolves in water.
5. Wood rots.
6. Heat changes H2O to steam.
7. Baking soda reacts to vinegar.
8. Iron (Fe) rusts

All are correct

Explanation:

I agree with all except the first one

b. acid is the correct answer @jayxboof all social media

acid : acids are those which accepts an electron-pairs.

base : bases are those which donates ab electron-pairs.

alkali : it is a base that dissolves in water. it is basically a base and the ph greater than 7.

hydroxide ion : it is a poly-atomic ion which is negatively charged.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.