题目 4 Which of the following is correct?(3)(1) The melting point of water is 100° C.(2) Steam condenses when it is heatea.(3) Evaporation can take place in the dark.(4) Heat is not needed for evaporation to take place. 相关知识点: 试题来源: 解析 (3) 反馈 收藏 ...
Water is an abundant resource found throughout Earth. It's comprised of hydrogen (H) and oxygen (O) atoms. The chemical formula for water is H2O. Thus, it's two parts hydrogen to one part oxygen. Answer and Explanation:1 The melting point of water is around 32 degrees Fahrenheit (F)...
Melting point is defined as the temperature at which a substance undergoes a transformation of the state from solid to liquid on the addition of heat. This transformation is called melting or fusion. During melting, the temperature of the substance remains constant (equal to the melting point)....
melt·ing point (mĕl′tĭng) The temperature at which a solid becomes a liquid. For a given substance, the melting point of its solid form is the same as the freezing point of its liquid form. The melting point of ice is 32°F (0°C); that of iron is 2,797°F (1,535°C...
Melting Point Can be altered by the presence of impurities. Salt lowers the melting point of ice. 15 Freezing Point A key factor in weather prediction. Forecasting snow requires knowing the freezing point of water. 15 Melting Point The temperature at which a solid turns into a liquid. The me...
The boiling point of water is 100 ° C. The melting point of potassium chloride is770 ° C. What is the most likely boiling point of a sample of water that contains a small quantity of dissolved potassium chloride?B A 97° C B 103°C C 767° C D 773°C 相关知识点: 试题来源:...
Lowering of the freezing point of water in porous glass was studied by a DTA technique. The samples contained a spectrum of average pore sizes. The freezing-point lowerings measured from melting and freezing curves correlated, as predicted by simple capillary theory, with the average pore size ...
The melting point of water is the temperature at which it changes from solid ice into liquid water. The solid and liquid phase of water are in equilibrium at this temperature. The melting point depends slightly onpressure, so there is not a single temperature that can be considered to be th...
This is an incomplete sentence and four choices marked A.,B.,C.and D..Choose the best one of them to complete the sentence.The melting point of ice and the boiling point of water are the fixed points ___ the Centigrade scale is based.( )A.by whichB.at whichC.on whichD.for which...
point. Ordinarily, the freezing and melting point of water is0 °C or 32 °F. The temperature may be lower if supercooling occurs or if there are impurities present in the water, which could causefreezing point depression. Under certain conditions, water may remain a liquid at temperatures ...