Chemistry pg 43 - 51

Acids

Formic acid - bees and ants inject the acid into you and this affects your skin cells and nerves

Citric acid - lemons and grape fruit

Lactic acid - yoghurt

Acetic acid - vinegar

Concentrated sulphuric acid reacts rapidly with paper and cloth

Battery acids react with copper coins

Hydrolic acid reacts with concrete

These acids are corrosive - they corrode or “eat away”

Acids are corrosive since they react chemically and can burn your skin

Safety with acids

Concentrated solutions have a lot of acid and not a lot of water and are very deangerous

Dilute solutions have more water in them and are less dangerous but must be handled with care still

Spill any acid / alkali on clothes , your skin or the bench - wash with lots of water and then call a teacher

Spill acid / alkali on eye - wash it with lots of water for 20mins + blink you’re eyelid under water + tell teacher

Check label on bottle when working with acids - often have a corrosive symbol

Testing for gases

Gas causes glowing splint to relight - oxygen
lit match in gas makes a mini explosion - gas it’s burning in is hydrogen
gas that puts out a burning flame - carbon dioxide

litmus paper (blue and red)

stays / turns blue - base

stays red / turns red - acid

stays same colour - nuetral

hydrochloric + magnesium (cover test tube with thumb) = explosion heard which makes hydrogen gas

hydrochloric acid + marble chips = no explosion and no gas was formed