Answer:
- Appearance – Physical properties can be observed or measured without changing the composition of matter. Physical properties are used to observe and describe matter. Physical properties include: appearance, texture, color, odor, melting point, boiling point, density, solubility, polarity, and many others.
A pure substance has properties that are constant throughout the whole sample. This means that a pure substance will have a constant appearance , color , density, melting point and boiling point throughout the sample.
- Melting point — The melting point is the temperature at which a solid changes into a liquid.. The melting point of a solid is the same as the freezing point of the liquid. At that temperature, the solid and liquid states of the substance are in equilibrium. For water, this equilibrium occurs at 0°C.
The melting point of a substance is the temperature at which the substance changes from a solid to a liquid. For a pure substance, melting occurs at a single temperature.
- Boiling point – The boiling point of a pure substance is the temperature which at the substance transitions from a liquid to the gaseous phase ... The boiling point at a pressure of 1 atmosphere is called the normal boiling point . The normal boiling point of water is 100°C, and remains constant until the water has vaporized.
#CarryOnLearning
#QiunanLin
