7th grade ch. 3 sec. 3-4 describing acids & bases-acids and bases in solution

When we think of acids and bases, we tend to think of chemistry lab acids and bases like

But we are surrounded by acids and bases in the world. Most of them are weak.

Lemons to be sour

Acids cause…

Acids cause…

Cavities in your teeth

acids•Taste sour

•React w/ metals & carbonates-produce H gas

acids•Turn blue litmus paper red

•form hydrogen ions (H+) in water

acids

corrosive•eat away @ other materials

•Taste bitter

•Feel slippery

•Don’t react w/ carbonates

bases

Bases turn red litmus

paper blue.

bbases•form hydroxoxide ions in water

hydroxide ionhydroxide ion•made of oxygen & hydrogen

OHOH--

indicator•compound that changes color when in contact w/ an acid or base

•ex. litmus paper

Properties of Acids and Bases [02:04]

strengths of acids & bases• refers to how well an acid

or base separates into ions in water

pH scale• ranges from 0 – 14

• pH < 7 acid

• pH = 7 neutral

• pH > 7 base pH Scale song

Universal indicator shows how acidic or alkaline a solution is

neutralization• reaction between an acid & base

• produces water & a salt

an ionic compound

Acids and Bases song-Youtube

Acids and Base Alien Juice Bar Interactive Activity

BBC Activity

Ch. 3 Sec. 3-4 Acids & Bases Reviewacid or base?

1. tastes sour

2. forms hydroxide ions in water

3. pH= 8

4. reacts with metals to produce H gas

5. feels slippery

6. turns red litmus paper blue

Ch. 3 Sec. 3-4 Acids & Bases

7. A reaction between an acid and a base is a __ reaction.

8. The pH of a neutral solution is __.9. The products formed when a base

reacts with an acid are __ and __.10. The symbol for a hydrogen ion is __

and the symbol for a hydroxide ion is___.