Flashcards

Chemistry

poppynb Inglês 15 flashcards

Flashcards do conjunto (15)

1Is the hole open, closed of in the middle when it is on a roaring flame?It is open
2What happens when you put porcelain on a safety flame and then on a roaring flame?It goes black on the safety flame and then the roaring flame burns all the charcoal off.
3What happens when you put a splint in unburnt gas - the blue part of the flame?It does not catch alight,
4What is the melting point of water with salt?Around -4 degrees to -8 degrees.
5What is the boiling point of water with salt?Around 110 - 103 degrees.
6How is it possible to separate ethanol from water?If you boil them, they will separate, because they have different boiling points - ethanol's boiling point is lower than waters
7What are the 6 substances that fossil fuel is separated into?Refinery gas, Petrol, Naphtha, Kerosene, Diesel, Bitomen
8What does Naphtha do?It is put in chemicals
9What does kerosene do?It is fuel for aeroplanes
10What is the boiling point of bitomen?It is 623 degrees
11What is this?It is a test tube
12What is a soluble?It is something that can be dissolved
13What does solvent mean?A liquid that is capable of dissolving substances
14What is the job of a castle and a mortar?To crush things!!!
15In some experiments using chromatography, why does ethanol work but not water.Sometimes water is insoluble and ethanol is soluble for some pens