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)....
Melting Point Used to determine the purity of a substance. A higher melting point indicates a pure substance. 8 Freezing Point The temperature at which a liquid turns into a solid. The freezing point of water is 0°C. 9 Melting Point A characteristic physical property of a substance. Diamond...
In science class, we learned that the ___ of water is 100 °C under normal pressure. A. freezing point B. boiling point C. melting point D. warming point 相关知识点: 试题来源: 解析 B。解析:boiling point是沸点,在正常气压下,水的沸点是100°C。A选项freezing point是水的冰点,为0°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: 解析 B 反馈 收藏 ...
Melting Point is a key parameter in developing new alloys and materials. 15 Boiling Point A critical factor influencing distillation processes. The Boiling Point of ethanol is exploited to separate it from water in distillation. 9 Melting Point Relevant in assessing the thermal stability of solids....
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...
(sea level). However, the value is not a constant. So, the longer definition of water's boiling point can be explained as such: The boiling point of water depends on the atmospheric pressure, which changes according to elevation. Water boils at a lower temperature as you gain altitude (e...
根据第一段最后一句“Salt lowers thefreezing/melting point of water, so in both cases theidea is to take advantage of the lower melting point. "可知,自制冰淇淋时,把盐撒在冰上是因为盐会降低水的冰点/熔点。故选B。03C词义猜测题。结合上下文语境及该词所在句句意可知,盐撒在冰上,能使冰融化。