U4-2 - General Practical Techniques
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1. Why is collection over water unsuitable for gases like sulfur dioxide?
Sulfur dioxide is soluble in water use gas syringe instead
Steps for weighing by tare: 1. Tare balance with container 2. ____________________
Steps for weighing by tare: 1. Tare balance with container 2. Add mass needed to container
Steps for weighing by tare: 1. ________________ 2. Add mass needed to container
Steps for weighing by tare: 1. Tare balance with container 2. Add mass needed to container
What is X?
Residue This is the solid remaining in the filter paper
What is Y?
Filtrate This is the liquid remaining after solid has been separated
Would this be acceptable in a diagram if the substance being heated is flammable?
No, because it could also represent e.g. a Bunsen burner. Show hot water bath or heating mantle instead
How can a flammable substance be heated safely?
By using a hot water bath, heating mantle or hotplate hot water bath is easiest to draw in a diagram
Is this a correct condenser setup if the goal is to prevent volatile reactants from escaping?
No, this is set up for separation of liquid mixtures. Correct set up must have condenser attached vertically.
Name the apparatus most suitable for measuring small volumes of liquid
Pipette volumetric or graduated both OK
Steps for weighing by difference: 1. Weigh + record mass of empty container 2. Weigh + record mass of container + solid 3. ______________
Steps for weighing by difference: 1. Weigh + record mass of empty container 2. Weigh + record mass of container + solid 3. Subtract mass of container from mass of container + solid
Steps for weighing by difference: 1. ____________ 2. Weigh + record mass of container + solid 3. Subtract mass of container from mass of container + solid
Steps for weighing by difference: 1. Weigh + record mass of empty container 2. Weigh + record mass of container + solid 3. Subtract mass of container from mass of container + solid
Steps for weighing by difference: 1. Weigh + record mass of empty container 2. ________________ 3. Subtract mass of container from mass of container + solid
Steps for weighing by difference: 1. Weigh + record mass of empty container 2. Weigh + record mass of container + solid 3. Subtract mass of container from mass of container + solid