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That is a physical change. The is no chemical change that takes place when you sharpen your pencil in a standard manner. I suppose if you sharpen it extremely fast, you could catch the pencil on fire, which would then be a chemical change.

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10y ago

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What kind of changes has taken place when you sharpen a pencil how do you know?

When you sharpen a pencil, the wood and graphite are shaved down to create a finer, sharper tip. You can tell the pencil is sharp by looking at the tip - it will be pointed and no longer dull or flat. Additionally, the pencil may feel lighter as material has been removed during the sharpening process.


What identifies a chemical change has taken place?

Signs that a chemical change has taken place include the formation of a gas, the formation of a precipitate, a change in temperature, and a change in color.


What is rusting mean?

A chemical change has taken place


When liquid water evaporates which has taken place molecular change or chemical change?

Physical change.


What evidence is there to show that a chemical reaction has taken place when an egg is cooked?

The change in color indicates that a chemical reaction has taken place.


What does not indcate that a chemical change may have taken place?

Fracture formation


How do you know when a chemical change has taken place when a firework goes off?

youwill hear it


What are four inicators that a chemical change has taken place?

Color Change Temperature change Observation of gas being released (bubbles) Formation of a precipitate


What changes gives NO evidence that a chemical reaction has taken place?

Changes such as a change in state (solid to liquid), change in color, change in odor, change in solubility, or change in temperature do not provide direct evidence that a chemical reaction has occurred. These changes can be indicative of a physical change rather than a chemical change. To confirm a chemical reaction, additional evidence such as the formation of new substances, evolution of gas, or consumption of reactants is necessary.


What evidence demonstrates that a chemical change has taken place?

You might observe a change in color, gas bubbles being formed, a change in temperature (this might require the use of a thermometer, unless the solution actually boils), or you can test for a specific chemical by using an indicator, or analyse the solution by means of a mass spectrometer. Explosions are also a very convincing form of evidence that a chemical change has taken place.


What signs that a physical change has taken place in water?

hydrogen and oxygen gas are given off


What are four clues that a chemical change has taken place?

A color changeproduction of lightproduction of gasproduction of bubbles