Ten examples of
A. Desirable and undesirable change.
B. Periodic and non periodic chnage.
C. Slow and fast change.
D. Natural and man made change.
E. Reversible and irreversible change.
F. Physical and chemical change.
Answers
Answer:
Burning: When we burn a piece of paper or wood, it turns to ash and smoke. We cannot obtain paper and wood from the ash again.
Cooking: We use heat for cooking, right? Once we cook our eggs, we cannot uncook them. ...
Rusting of iron: You must have seen rusting of iron.
The melted ice cube may be refrozen, so melting is a reversible physical change. Physical changes that involve a change of state are all reversible. Other changes of state include vaporization (liquid to gas),freezing (liquid to solid), and condensation (gas to liquid). Dissolving is also a reversible physical change.
Periodic changes are changes which occur periodically or at regular intervals Example: Change of seasons. Day and night, changing phases of the moon, beating of heart, clock striking an hour are all examples of periodic motion whereas waterbecoming ice, burning of matchstick etc are non periodic changes.
Ammonium chloride is a white solid. It breaks down when heated, forming ammonia and hydrogen chloride. ...
Ammonium chloride ⇌ ammonia + hydrogen chloride.
The symbol ⇌ has two half arrowheads, one pointing in each direction. It is used in equations that model reversible reactions:
Reversible reactions, ammonia and the Haber process [Chemistry only] Many reactions are irreversible. But in a reversible reaction, the products can react to produce the original reactants. At equilibrium, the concentrations of reactants and products do not change.
Note: This is a type of catabolic reaction (the larger glucose molecule is broken down to smaller carbon dioxide molecules) related to cellular energy production. In animal cells, such as humans, this is an irreversible reaction. Other metabolic reactions are called reversible reactions
You cannot turn a baked cake back into its raw ingredients. Some chemical reactions can be reversed, and re-formed into the original substances. These are REVERSIBLE CHANGES. When the iron and magnesium in a firework burn, they react with oxygen and produce ash and smoke.
In a irreversible reaction, the reactants react to form the products, which cannot revert back into reactants. In reversible reactions, as the reactants react with other reactants to form products, the products are reacting with other products to form reactants. Combustion cannot be undone.
Reversible changes are changes which can be reversed by a change in conditions. Examples: Melting of ice and freezing of water. ii. Irreversible changes are changes which cannot be reversed by a change in conditions. Example: Burning of magnesium.