A liquid is vaporized at it.s boiling point. Predict the signs of W, Q, △H, △S and △G. Explain your
A liquid is vaporized at it.s boiling point. Predict the signs of W, Q, △H, △S and △G.
Explain your answers.
A liquid is vaporized at it.s boiling point. Predict the signs of W, Q, △H, △S and △G.
Explain your answers.
第4题
A petroleum liquid has a flash point of 85°F. This is a grade ______.
A.B flammable liquid
B.C flammable liquid
C.D combustible liquid
D.E combustible liquid
第5题
Glass-ionomer cement liquid is()
A.aqueous silicon dioxide
B.a combination ofeugenol and phosphoric acid
C.a true natural colloidal liquid
D.an aqueous solution of polymers and copolymers of acrylic acid
第6题
A.0°
B.45°
C.90°
D.135°
第8题
What is the best title for this passage7
A.How to Heat Water
B.Is It a Solid, Liquid or Gas.?
C.Density and Weight
D.Cooking with Water
第9题
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
第10题
A.provides some mechanical interlocking with the solid
B.exhibits a large contact angle with the solid
C.enters into some form. ofchemieal reaction with the solid
D.exhibits a small contact angle with the solid
第11题
Evaporation rates of hydrocarbon liquid from horizontal surfaces are approximately given by
Where p is vapor pressure of the liquid and P is the atmospheric pressure. We have spilled a layer of lubricating oil on a metal drip pan in our garage. It forms a layer 1 mm thick. Its density is 1g/cm3and its molecular weight is 400 g/mol. Its vapor pressure is approximately 10-7torr at 20℃. Estimate how long it will take all of this motor oil to evaporate at 20℃.