plzz!!! chemistry question??

Question

what are 3 examples of a phisical change? and 3 examples of a chamical change?

Answer 1

Physical change
A change in the form of a substance, for instance, from solid to liquid or liquid to gas or solid to gas, without changing the chemical composition of the substance. As we will see later, chemical bonds are not broken in a physical change.
Examples: Boiling of water and the melting of ice.

Chemical change
The change of a substance into another substance, by reorganization of the atoms, i.e. by the making and breaking of chemical bonds. In a chemical change a
chemical reaction takes place.
Examples: Rusting of iron and the decomposition of water, induced by an electric current, to gaseous hydrogen and gaseous oxygen.

Answer 2

Physical:
melting, cutting into smaller pieces, freezing, boiling

Chemical:
burning, reacting with acid, taste, smell, digestion, baking a cake

Answer 3

there's a undeniable quantity of memory paintings to those. you will desire to remember the names of the compounds or chemical species that form in a reaction with a view to be waiting to write down the reaction out. you moreover would would desire to remember the formulation of the compounds you're speaking approximately. Potassium hydroxide is KOH and dissociates in water to grant a potassium io (ok+) and a hydroxide ion (OH-), so which you will write KOH(aq) ---> ok+(aq) + OH-(aq) the place the 'aq' merely potential 'aqueous' or 'in water' For something, calcium hydroxide is Ca(OH)2 and could dissociate to grant a calcium ion (Ca++) and a couple of hydroxide ions. Sodium oxide is Na2O and could dissociate to grant 2 sodium ions (Na+) and one oxide ion (O=). The O= ion could today react with a water molecule (H2O) to offer 2 hydroxide ions. Given this training, i'm going to bypass away it to you to write down out the main appropriate chemical equations.

Answer 4

Please note that taste and smell are physical properties of a substance.