Answer:
physic
Explanation:
physical chnages are chnages to the appearance
chemical chnages are chnages like
color temperature chnaging fromna gas to a liquid etc
<span>Here are some
pH < 7
Sour taste (though you should never use this characteristic to identify an acid in the lab)
Reacts with a metal to form hydrogen gas Increases the H+ concentration in water
Donates H+ ions<span>
Turns blue litmus indicator red</span></span>
