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.
Lute... or Loot, depending on which one you'd like!
Seismic Gap
San Francisco
Photographs are taken in a lot of places, but often professional photos are taken in a photography studio.
The indefinite pronoun 'everyone' is singular, a word representing each individual person.Example: Everyone is here.The personal pronoun 'they' is plural, a word that takes the place of a plural noun or two or more nouns.Example: The students are here. They have taken their seats.The personal pronouns that take the place of the indefinite pronoun 'everyone' are 'he or she' as a subject, and 'him or her' as an object in a sentence.Example: Everyone is here. He or she have taken their seats.Although the above is technically correct, it's very common to use the plural pronouns 'they' or 'them' to take the place of a singular noun or pronoun because in English there is no common gender pronoun for people when the gender is not specified. Most people would use 'they'.Example: Everyone is here. They have taken their seats.
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.
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.
A chemical change has taken place
Physical change.
The change in color indicates that a chemical reaction has taken place.
Fracture formation
youwill hear it
Color Change Temperature change Observation of gas being released (bubbles) Formation of a precipitate
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.
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.
hydrogen and oxygen gas are given off
A color changeproduction of lightproduction of gasproduction of bubbles