What kind of substances tend to be acidic and what kind of substances tend to be alkaline?

Substances

0 (most acidic)Hydrochloric acid (HCl)

1Stomach acid

2Lemon juice

3Cola, beer, vinegar.

Examples of alkaline are:sodium hydroxide, potassium hydroxide, calcium hydroxide, magnesium hydroxide etc

when you breathe in, or inhale, your diaphragm contracts (tightens) and moves downward. this increases the space in your chest cavity, into which your lungs expand. the intercostal muscles between your ribs also enlarge the chest cavity. they contract to pull your rib cage both upward and outward when you inhale.

multiply it by 5 in order for you to understand i cant give an exact answer.