Question

name horon w esrare class 3chem date 9/18/25 section 3 changes of state continued standards check ps 3a energy is a property of many substances and is associated with heat, light, electricity, mechanical motion, sound, nuclei, and the nature of a chemical. energy is transferred in many ways. word help: chemical of or having to do with the properties or actions of substances 3. identify what must be added to melt a substance? reading check 4. describe what is the melting point of a substance? melting point and energy the melting point of the substance is the temperature in which it changes from a solid to a liquid. as the temperature of the solid becomes greater, its particles move faster. when a certain temperature is reached, the solid will melt. the melting point of a substance is a physical property of the substance. melting point depends on the composition of, or material that makes up, the substance. it can be used to help identify a substance. for example, copper has a melting point of 420.7°c. other substances may look like copper, but they will likely have different melting points. for a solid to melt, particles must absorb energy. the energy makes the particles move faster and have less attraction to each other. this allows the particles to move past each other. the solid melts and becomes a liquid. what are freezing and freezing point? the freezing point is the temperature at which a substance changes from a liquid to a solid state. when a liquid freezes, its particles have less energy and become closely locked in position. energy is removed from the substance during freezing. freezing is the exact opposite of melting. the freezing point of a substance is exactly the same as the melting point of the substance. they both happen at the same temperature. for example, liquid water freezes and becomes solid ice at temperatures below 0°c. solid ice melts and becomes liquid water at temperatures above 0°c. reading check 5. identify if the freezing point of a substance is 68°c, what is its melting point?

Explanation:

Answer:

(3) Energy
(4) The temperature at which a substance changes from a solid to a liquid; it is a physical property that depends on the composition of the substance and can be used to identify the substance
(5) 68°C