For example the transformation of liquid water in vapors (vaporization).
Burning coal is a chemical reaction, a chemical change; but the solid reactant is transformed in gaseous products (H2O and CO2) - this is a physical change.
Yes, a glowing neon sign represents a physical change because the neon gas inside the sign undergoes a change in energy state to emit light. This change is reversible and does not alter the chemical composition of the neon gas.
The physical quantity given by the slope of a velocity-time graph is acceleration. This is because the slope represents the rate of change of velocity over time, which is how acceleration is defined (acceleration = change in velocity / time taken).
No. It is a physical change.
The dimensional formula of a physical quantity represents how it is composed of fundamental dimensions like length, mass, and time. For example, the dimensional formula of velocity is [LT^-1] where L represents length and T represents time. The dimension of a physical quantity refers to the type of fundamental dimension it represents, like length, mass, or time.
The burning of gasoline represents a chemical change because it involves a reaction with oxygen to produce heat, light, and new chemical compounds. On the other hand, the evaporation of gasoline represents a physical change as it involves the gasoline changing from a liquid to a gas without any change in its chemical composition.
Toasting bread represents a chemical change.
Tearing paper represents a physical and not a chemical change. Chemical bonds are not broken in this instance, but paper is physically separated (by force) from other paper.
Spoiled food of any kind represents a CHEMICAL change.
i m pretty sure a colour change represents a Chemical change
Slicing turkey represents a physical change, not a chemical change. The chemical composition of the sliced turkey is identical to the chemical composition of the intact turkey. Only a physical change has taken place.
For example the transformation of liquid water in vapors (vaporization).
Burning coal is a chemical reaction, a chemical change; but the solid reactant is transformed in gaseous products (H2O and CO2) - this is a physical change.
Evaporation represents the uptake of energy by the liquid that results in a physical change. (phase or state of matter)
Peach cobbler represents a dessert.
Corrosion represents a CHEMICAL change.
Humidity itself is not a physical change, but a physical property of the air that can change based on temperature and pressure. Humidity represents the amount of water vapor present in the air, and can vary without altering the composition of the air itself.