Chemistry practicals
問題一覧
1
the one which does not move with the sample
2
The mobile phase often consists of a main solvent mixed with a co-solvent
3
Method draw a pencil line across the chromatography paper, 1 - 2 cm from the bottom use a pipette or capillary tube to add small spots of each ink to the line on the paper place the paper into a container with a suitable solvent in the bottom allow the solvent to move through the paper, but remove the chromatogram before it reaches the top allow the chromatogram to dry, then measure the distance travelled by each spot and by the solvent
4
pencil so that it does not dissolve in the solvent and affect the results
5
otherwise the spots will dissolve away
6
the furthest distance traveled by the developing solvent (or eluent)
7
All dots of inkbshould line up
8
This may mean that that particular substance is more soluble
9
dividing the distance travelled by the component by the distance travelled by the solvent
10
glass is made mainly from sand. Other than sand (mainly SiO₂), the other raw materials are limestone (mainly CaCO,) and sodium carbonate-soda- (Na₂CO₂)
11
These raw materials are heated to 1500°C. At this high temperature, they melt and react to form molten glass. As it cools down it turns into a solid
12
hardness strong under compression. Brittle, meaning they can shatter when struck heat resistant
13
Ceramic materials are strong, so they can be used for structural products. For example, bricks are ceramic materials made by baking moulded clay.
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12問 • 2年前問題一覧
1
the one which does not move with the sample
2
The mobile phase often consists of a main solvent mixed with a co-solvent
3
Method draw a pencil line across the chromatography paper, 1 - 2 cm from the bottom use a pipette or capillary tube to add small spots of each ink to the line on the paper place the paper into a container with a suitable solvent in the bottom allow the solvent to move through the paper, but remove the chromatogram before it reaches the top allow the chromatogram to dry, then measure the distance travelled by each spot and by the solvent
4
pencil so that it does not dissolve in the solvent and affect the results
5
otherwise the spots will dissolve away
6
the furthest distance traveled by the developing solvent (or eluent)
7
All dots of inkbshould line up
8
This may mean that that particular substance is more soluble
9
dividing the distance travelled by the component by the distance travelled by the solvent
10
glass is made mainly from sand. Other than sand (mainly SiO₂), the other raw materials are limestone (mainly CaCO,) and sodium carbonate-soda- (Na₂CO₂)
11
These raw materials are heated to 1500°C. At this high temperature, they melt and react to form molten glass. As it cools down it turns into a solid
12
hardness strong under compression. Brittle, meaning they can shatter when struck heat resistant
13
Ceramic materials are strong, so they can be used for structural products. For example, bricks are ceramic materials made by baking moulded clay.