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Why wearing down of pencil lead is physical change?
Wearing down of pencil lead is a physical change because the substance is still the same (graphite), just in a different form (smaller pieces). No new substances are formed during the process, making it reversible by simply sharpening the pencil to create a new point.
Is an isothermal process necessarily internally reversible?
No, an isothermal process is not necessarily internally reversible.
What is a good title for a science fair project about pencil resistors?
Pencil Circuts
What is the name of pencil point?
The pointed end of a pencil where the graphite or lead is located is called the pencil tip or pencil point.
Does the entropy of the universe increase when a system undergoes a reversible process?
Yes, the entropy of the universe increases when a system undergoes a reversible process.
Why wearing down of pencil lead is physical change?
Wearing down of pencil lead is a physical change because the substance is still the same (graphite), just in a different form (smaller pieces). No new substances are formed during the process, making it reversible by simply sharpening the pencil to create a new point.
Why sharpening a pencil is a different type of physical change than freezing water to make ice cubs?
Although they both still have the same basic elements (i.e. pencil and lead vs water), there is a physical state change that occurs when you freeze water to make ice. Sharpening/shaving down a pencil only results in a difference of shape and size. It's about the same as ripping paper vs burning paper. Also, freezing water to make ice is a reversible change (you can melt ice to turn it back into water) and shaving a pencil is an irreversible change (you can't sharpen a pencil and then put the pencil shavings back onto the pencil.)
Is evaporating reversible or irreversible?
Yes, this change is reversible.
Is dissolving salt in water reversible or irreversible?
This is a reversible process.
What chemical reaction that can proceed forward or backward is a?
You think probable to a reversible reaction.
Is a Bunsen burner on reversible or irreversible?
A Bunsen burner is an object: it is not a process of any kind.
How do you know if a transformer is reversible?
reversible
Is soil reversible?
no soil is not reversible.
Is freezing reversible or irreversible?
reversible!
Is bubbling reversible?
Yes it is reversible, for example bubbling something on the gas or reversible you can just turn the gas off. So bubbling something is reversible.
Is evaporation a reversible or non reversible change?
non --- Evaporation is reversible by condensation, lowering the temperature.
Is wood reversible?
It depends on how you bend the wood. For example, if you steam it, it is reversible. But if you cut notches, it is not reversible.
