题目内容
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Silver oxide，Ag2O，can decompose into its elements，Ag(S)and O2(g)．(a)Write a balanced equation for this decomposition reaction．(b)Calculate the
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Glass ionomer cements are composed of()
A．zinc oxide powder and polycarboxylic
B．zinc oxide powder and phosphoric acid liquid
C．aluminosilicate powder and phosphoric acid liquid
D．aluminosilicate powder and polycarboxylic liquid
Which of the following components could replace eugenol in a zinc oxide paste()
A．oil ofcloves
B．acetic acid
C．alginic acid
D．ortho-ethoxybenzoic acid
A panicle is a hollow sphere of a metal oxide.The density of the metal oxide is 2000kg/m3. The hollow portion in the center of the sphere is full of air that has the same density as the surrounding air through which the sphere is falling at its terminal velocity. The outside diameter of the sphere is 10μ and the thickness of its walls is 0.1μ(i.e., the bubble in the center has a diameter of 9.8μ). How fast is it falling？
The foll.wing data were measured for the reduction of nitric oxide with hydrogen.
2NO(g)+2H2(g)→N2(g)+2H2O(g)
| Initial oncentration/(mol·dm-3) | Initial rate of formation of H2O/mol·dm-3·s-1 | |
| c(NO) | c(H2) | |
| 0.10 0.10 0.20 | 0.10 0.20 0.10 | 1.23×10-3 2.46×10-3 4.92×10-3 |
What is the rate equation for the reaction？
A．the compressive strength of the cement is too low
B．cement interferes with the polymerization of the resin
C．zinc oxide and Bis-GMA form. a soluble compound
D．the cement increases the polymerization shrinkage of the resin
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