What Is A Physical Change In Science
Physical changes
Concrete changes such as state change and dissolving are reversible, and there is no change in total mass when they happen. Flowing and diffusion happens in liquids and gases, but not in solids.
Change of state
Substances can change state, usually when they are heated or cooled. For instance, liquid water turns into steam when it is heated enough, and it turns into ice when information technology is cooled plenty. State changes are reversible – ice can be melted and and so frozen again. No new elements or compounds are formed.
The closeness, arrangement and motion of the particles in a substance alter when information technology changes land.
Materials are a store of internal energy , due to the motion of particles and the chemical bonds between them.
When a substance is heated, its internal free energy increases:
- the movement of its particles increases
- bonds between particles break when a substance melts or evaporates, or sublimes to form a gas from a solid
When a substance is cooled, its internal energy decreases:
- the motion of its particles decreases
- bonds between particles form when a substance condenses or freezes, or sublimes to form a solid from a gas
Conservation of mass
The particles in a substance stay the aforementioned when information technology changes country - only their closeness, organisation or motion change. This means that:
- the chemical nature of the substance itself stays the aforementioned
- the mass of the substance stays the same
For example, 10 m of h2o boils to form 10 g of steam, or freezes to form ten thou of ice. This is called conservation of mass .
Source: https://www.bbc.co.uk/bitesize/guides/zc9q7ty/revision/4
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