Electronic single-pan balances with digital readouts are now favoured over mechanical types and are common in most laboratories. There are essentially two types of balance:
General-purpose balances which weigh to the nearest 0.01 g with a capacity of about 300 g. Chemicals may be dispensed for weighing, into a suitable weighing container, directly onto these balances.
Analytical four-figure balances for quantitative work, which weigh to the nearest 0.0001 g (0.1 mg) and have a maximum capacity of about 100 g. Chemicals must not be transferred onto the balance at any time and analytical balances must only be used for weighing by difference.
Both types are illustrated in Fig. 4.3 and you should familiarize yourself with their operation before use.
The container may not be the same temperature as the solution (especially if the container is not a very good heat conductor). Thus, having the bulb of the thermometer touch the container may give an inaccurate reading.
Boil a pot of water on a stove (but not to hot, it could ruin the cardboard). The steam from the boiling water should be able to moisten the adhesive. Then, take your nail and SLOWLY peel the adhesive, but test it on a corner first. Finish up and then clean any other minor residues (assuming that it is a project)
It is corrosive :) x
Yes. HSEA is a non-methylene chloride adhesive made by Westech Aerosol. Its formula does not have chlorinated solvents and hazardous air pollutants. I find it very easy and effective. It's also very simple. Just spray it and it should bond any kind of materials together. In my experience as a woodworking specialist, this is the only adhesive that I trust. When it dries, it does not leave any stain. So for me and my co workers, there is no other adhesive as good as HSEA.
It should be a "pure" substance, but its really an alloy.
If a solid that has a mass of 25 grams melts, it should result in a _______ with a mass of _______ grams.
The substance should be placed on the left pan and the weights should be placed on the right pan and the balance must be arrested (Locked) so as to prevent any unnecessary movement.
The container may not be the same temperature as the solution (especially if the container is not a very good heat conductor). Thus, having the bulb of the thermometer touch the container may give an inaccurate reading.
This is likely to ensure that, should the lid be removed or misplaced, the substance is still identifiable.
The thermometer should be kept upright not tilted. 2.) The bulb of the thermometer should be surrounded from all sides by the substance of which the temperature is to be measured. 3.) The bulb should no touch the surface of the container.
Mapei Eco300 is my favorite .
All glues should be 'adhesive'. It simply means 'something that will stick' -and a glue is not much use if it won't stick.
An adhesive which is capable of filling up to 1/16 void between two mating surfaces is known as gap filling adhesive. It should possess high durability and strength.
One of the most important things that you should look for in a self adhesive label is how well it sticks. You might also want to look for a size that you want.
You will want to use a refrigerated container to keep them from molding.
It should be kept in very dry, normal room temperature conditions. Use an air-tight container. For extra precaution place a substance in the container that will help to keep the art dry, such as silica gel. The warmer the temperature, the softer the sugar will become. ____________________________________________________________________________________________________
Contact your local auto parts store, they will sell you the proper adhesive for your type of vehicle.