記憶度
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問題一覧
1
heating the gypsum in order to remove the water of crystallization
calcination
2
gypsum is heated in a kettle at 110oC-120oC; production of steam with pressure which changes the rock to powder form, after cooling, the white powder is then called plaster or b-hemidydrate.
open calcination
3
container (autoclave), at 120oC-130oC; the higher the temperature → the greater the pressure → finer yellow powder particles are produced called dental stone of a-hemihydrate
closed calcination
4
type ii gpysum product
plaster of paris
5
plaster if paris process of calcination
open calcination
6
effective retarder of plaster of paris
borax
7
type 3 gypsum products
dental stone class 1
8
dental stone class 1 process of calcination
closed calcination
9
dental stone class 1
10
type 4 gypsum
dental stone class 2
11
die stone
dental stone class 2
12
dental stone class 2
13
type 5 gypsum product
dental stone higher strength and expansion
14
dental stone higher strength and expansion
15
Gypsum is
Calcium sulfate dihydrate (CaSO4*2H2O)
16
Gypsum obtained from
Dihydrate
17
calcination
18
Chemical formula of hemihydrate
CaSO4* 1/2 H2O
19
Exothermic reaction
20
Type 2: plaster of Paris
21
Alabaster B hemihydrate
Type 2 plaster of paris
22
Open calcination
Type 2 plaster of paris
23
type 2
24
CaSO4 hemihydrate - constituent principal
type 3
25
type 3
26
type 4
27
type 4
28
type 4
29
type 5
30
type 5