Chemical & Physical Changes

Chemical changes occur at the molecular level. Chemical changes produce new substances. Another way of thinking is that chemical reactions involve chemical reactions. Examples of chemical changes include burning (burning), boiled eggs, rusting iron pots, and mixing salt and sodium hydroxide to make salt and water.

Physical changes are related to the state of energy and matter. Although starting materials and finished materials may appear to be very different from one another, physical changes do not produce new substances. A change in state or phase (melting, freezing, evaporation, coagulation, sublimation) is a physical change. Examples of physical changes are crash cans, molten ice cubes, broken bottles and so on.

Chemical change creates substances that did not exist before. There may be clues for the occurrence of chemical reactions such as light, heat, color change, gas generation, smell, sound etc. Even though the materials may seem different, the material at the beginning and end of the physical change is the same

There are two types of material change: physical change and chemical change. As its name implies, physical changes affect the physical properties of substances and chemical changes affect the chemical nature of the substance. Many physical changes are reversible (such as heating and cooling), but chemical changes are usually irreversible, or can be reversed only by additional chemical changes. Another way of thinking is that substances are not fundamentally different substances due to physical changes, but substances may become chemically new substances due to chemical changes. For example, there are two physical changes in a mixed smoothie. To change the shape of each fruit and to mix various fruits. During the mixing process, there is no change in the chemical substances in the smoothie ingredients (for example, vitamins in water and water do not change), so it can be seen that there is no chemical change.

All substances have different physical and chemical properties and may undergo physical or chemical changes. Physical properties such as hardness and boiling point, and physical changes such as melting and freezing do not include changes in the composition of the substance. Chemical properties such as flammability and acidity and chemical changes such as rust involve the generation of substances different from existing materials. Measurable attributes fall into two categories. The wide nature depends on the amount of material present, such as the quality of gold. Reinforcement does not depend on the amount of material present, such as the density of gold. Heat is an example of wide nature, temperature is an example of intensive nature.