0
Chemical changes occur when the elements, their valences, and their amounts change. 4H + O2 => 2H2O is a chemical change because the valences change from unfilled to shared.
Physical changes occur when the material phase changes. In fact, in 4H + O2 => 2H2O we also have a physical change...from gas to liquid water (in most cases). NOTE: That there was a chemical change here is incidental, the phase change is the physical change.
What else can I help you with?
Is the separation of cream and milk a chemical change?
No, the separation of cream and milk is a physical change, not a chemical change. It occurs due to differences in density between the two components and can be reversed by mixing them back together.
Is peeling an apple a physical or chemical change?
it is a chemical change
Is crushing charcoal into powder a physical or chemical change?
Crushing charcoal into powder is a physical change, as it alters the size and shape of the charcoal without changing its chemical composition.
Is Cleaning a painted surface with acid a chemical or physical change?
Chemical broooooooooooooooo niga
What are the differences between physical and chemical changes?
Physical changes involve a change in appearance or state of matter without altering the chemical composition, while chemical changes result in the formation of new substances with different chemical properties.
Differences between chemical and physical change?
A chemical change results in a change in chemical composition, while a physical change does not.
What is the differences between physical and chemical change in tabular form?
physical change are reversable
What is the differences between a physical and chemical change in a candle?
The physical change will keep the atoms the same not moving but the chemical change will make it move around with energy.
What are the differences betwen physical and chemical changes in terms of what happenes to molecules?
During a chemical change the molecule is transformed; during a physical change the molecule is not transformed.
Is distillation a chemical change or a physical change?
Distillation is a physical change. It involves the separation of components in a mixture based on differences in their boiling points, without changing the chemical composition of the substances.
What is the differences between physical and chemical changes in relation to fire services?
Physical changes are melting and boiling in this case; fire is a combustion, a chemical change.
Is the separation of cream and milk a chemical change?
No, the separation of cream and milk is a physical change, not a chemical change. It occurs due to differences in density between the two components and can be reversed by mixing them back together.
Is stapling an envelope a physical change or chemical?
A physical change
Is painting a door a physical or chemical change?
Physical change of the paint, not the door.
Is peeling an apple a physical or chemical change?
it is a chemical change
Is acidity physical change or chemical change?
An acid is a chemical compound, not a physical or chemical change.
Is crushing charcoal into powder a physical or chemical change?
Crushing charcoal into powder is a physical change, as it alters the size and shape of the charcoal without changing its chemical composition.
