Flashcards
required practicals (chemistry)
Flashcards do conjunto (6)
- 1making salts (equipment):-beaker
-gauze
-bunsen burner
-heatproof mat
-tripod - 2making salts (experiment):1. start with a fixed amount of dilute sulfuric acid (limiting reactent)
2. gently heat the acid until almost boiling
3. using a spatula, add small amounts of copper oxide to the acid and stir using a glass rod
4. continue adding copper oxide until some powder has stopped dissolving - 3making salts (crystillisation):1. filter away remaining copper oxide with filter paper into a conical flask
2. plce solution in an evaporating basin and heat gently over a beaker of boiling water
3. heat until 1/2 solution remains
4. leave copper sulfate to crystallise for 24 hours - 4temperature changes (variables):independent variable: the volume of sodium hydroxide solution
dependent variable: maximum temperature reached
control variable: volume of hydrochloric acid and concentrations of both hydrochloric acid and sodium hydroxide solution - 5temperature changes (experiment):1. use a measuring cylinder to measure 30cm^3 of dilute hydrochloric acid
2. transfer acid to polystyrene cup and place cup in a beaker (stops it from falling)
3. measure temp of the acid
4. use measuring cylinder for 5cm^3 of sodium hydroxide solution and transfer it to cup
6. add plastic lid to cup and place thermometer through hole in the lid
7. stir the solution
8. watch temperature rise on thermometer (exothermic reaction) and record highest temperature reached
9. repeat again using 10cm^3 of sodium hydroxide solution (each time increase the vol by 5cm^3 until 40cm^3) - 6electrolysis (experiment):1. pour 50cm^3 of copper (II) chloride into a beaker
2. place plastic petri dish over beaker which should have 2 holes
3. insert a carbon graphite rod into each hole (electrodes which are inert) they must not touch as it'd produce a short circuit
4. attach crocodile leads to the rods and connect rods to a low-terminal power supply. select 4v and turn it on.
5. cathode will be coated with copper as the metal is less reactive than hydrogen
6. bubbles of chlorine gas come out of anode
7. damp blue litmus paper being bleached proved that the gas is chlorine
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- GCSE Chemistry (Practicals) FlashCards sobre required practicals (chemistry), criado por Amelia Quinn em 16-05-2018.
- Criado por
- Amelia Quinn
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