Four different metals were placed into test tubes and 10 cm3 hydrochloric acid added. Each metal strip was 1cm long. Bubbles of hydrogen are produced.Place these metals in order of reactivity.a is iron and hydrocloric acid b is zinc and hydrocloric acid c is magnesium and hydrocloric acid d is copper and hydrocloric acid
Answers
other records them. The experiment itself takes only a few minutes. But allow at least 30 minutes to give students time to set up, take readings and draw graph.
Hydrogen gas (extremely flammable) is generated in the experiment. Students should not have access to any source of ignition.
Equipment
Apparatus
Eye protection
Conical flask (100 cm3)
Single-holed rubber bung and delivery tube to fit conical flask (note 1)
Trough or plastic washing-up bowl (note 2)
Measuring cylinders (100 cm3), x2
Clamp stand, boss and clamp
Stopwatch
Graph paper
Apparatus notes
The bungs in the flasks need to be rubber. Corks are too porous and will leak. The tube through the bung should be a short section of glass, and then a flexible rubber tube can be connected.
Gas syringes can be used instead of troughs of water and measuring cylinders. But these are very expensive and are probably best used by the teacher in a demonstration. Syringes should not be allowed to become wet, or the plungers will stick inside the barrels.
Chemicals
Magnesium ribbon cut into 3 cm lengths
Dilute hydrochloric acid, 1M