What's the difference between a chemical change and a physical change?

Question

Also, what is an ion? And does anyone have some suggestions for chemical questions fit for a board game?
Sorry there are so many questions!

Answer 1

Chemical change is any change that results in the formation of new chemical substances. At the molecular level, chemical change involves making or breaking of bonds between atoms. These changes are chemical:

iron rusting (iron oxide forms)
gasoline burning (water vapor and carbon dioxide form)
eggs cooking (fluid protein molecules uncoil and crosslink to form a network)
bread rising (yeast converts carbohydrates into carbon dioxide gas)
milk souring (sour-tasting lactic acid is produced)
suntanning (vitamin D and melanin is produced)
Physical change rearranges molecules but doesn't affect their internal structures. Some examples of physical change are:


whipping egg whites (air is forced into the fluid, but no new substance is produced)
magnetizing a compass needle (there is realignment of groups ("domains") of iron atoms, but no real change within the iron atoms themselves).
boiling water (water molecules are forced away from each other when the liquid changes to vapor, but the molecules are still H2O.)
dissolving sugar in water (sugar molecules are dispersed within the water, but the individual sugar molecules are unchanged.)
dicing potatoes (cutting usually separates molecules without changing them.)
Classification of real processes can be tricky. Complex changes can be broken down into many simpler steps. Some of the steps are chemical and others are physical, so the overall process can't cleanly be placed in either category. For example, boiling coffee involves chemical change (the delicate molecules that give coffee its flavor react with air and become new, bitter-tasting substances) and physical change (the water in the coffee is going from liquid to gaseous form).

Answer 2

A chemical change is a process in which reactants are changed into one or more different products. A chemical change occurs whenever new compounds are formed or existing compounds decomposed. During this reaction, chemical bonds between atoms are broken and new chemical bonds formed. This results in a rearrangement of the chemical bonds, thus differing from physical change which is a change of a substance's state (solid, liquid, gas).

There are several different types of chemical change. These include synthesis, decomposition, single displacement, double displacement, neutralization, precipitation and redox.

Indicators of a chemical change include a colour change, the formation of a precipitate, the formation of gas, production (exothermic) or loss (endothermic) of heat, production of light, the appearance of a new substance, a use-up of a starting substance or a change in temperature or energy. When new substances are formed, a chemical change has occurred, and a chemical reaction has taken place. Note that, in a few cases, exothermic reactions may be hot enough cause certain chemicals to also undergo a change in state; for example in the case of aqueous solutions, bubbles may not necessarily be newly produced gas but instead water vapour.


A physical change, in chemistry, is when a substance undergoes some form of change that does not change the substance at the molecular level (i.e. a chemical change). Physical changes do not create new substances, as in a chemical change, but result in the same substance in a different form or shape. A physical change in which a substance changes states between solid, liquid and gas is called a phase change. When water is frozen into ice it undergoes a phase change, and thus a physical change, as it is still water but in a different form. Under normal conditions physical changes can generally be considered reversible, however this does not always hold true. Other characteristics of physical changes include the absence of a newly created substance or the change is reversible. Water's change from liquid to solid is an example of a physical change. It is simply a change in appearance.

Answer 3

a chemical change is something that will change the insides of an element or whatever. a physical change will only change the appearance. an ion is a charged particle, it can be negative(if it gained an electron) or positive(if it gave away an electron).

sorry, no idea about a question fit for a board game.

Answer 4

chemical change- reactants become one or more different products from what they originally were

physical change- when substance undergoes a change that does not change the substance at the molecular level and doesnt make a new product

ion- atom, group of atoms, or subatomic particle with a net electric charge.

depends on what kind of board game it is. just stick with trivia questions: if you mix so and so, and get this, is it a chemical or physical change? is an electron considered an ion? why?

i dont know. haha

Answer 5

A chemical change would be something like rust on a piece of metal actually changing the composition of the item. Physical is just a change in physical state like melting ice. It's still water.

An ion is a charged particle.

Answer 6

a chemical change changes the composition of the substance making it a different substance.for example:hydrogen can be changed into water by adding two oxygen bonds,a physical change only changes the "physical" traits for example:h2o (water can be changed into ice, steam ,or just plain water .it doesnt change the chemical composition....:)

Answer 7

changes in wood chemical in physical out

Answer 8

a physical change is something that you can see, like, rock eroding, or a tree rotting

chemical change is something that takes place chemically, such as metal rusting or stuff like that

Answer 9

chemical change are substances change into size,shape, properties and turn into new products while physical change ah... uhm..... i forgot already i'm sorry c",)

Answer 10

right on