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In physical change the moleculer distance is changed(increase/decrease) but the moleculer structure remains unalter.
Wiki User
∙ 12y ago
Wiki User
∙ 14y agohttp://en.wikipedia.org/wiki/Chemical_kinetics
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What happens to the number of molecules of the gas when it is compressed?
It does not change, unless a chemical reaction in the gas happens.
Is it possible for the number of molecules to change as a result of a chemical reaction?
That happens all the time. Smaller molecules combine to form larger molecules; larger molecules break up into smaller molecules.
What happens in a chemical change but not in a physical change?
If you bend a paper clip it is a physical change because it is still a paper clip. It's chemical identity has not changed. In a chemical change, the chemical identity of a substance changes. For example, if the paper clip were made of steel and rusted, then it's chemical identity would change to include oxygen chemically bonded to the metal, iron oxide.
Do atoms change during a physical change?
Nope. All that happens in chemical reactions is that atoms are rearranged into new molecules or compounds. You can't destroy atoms in a chemical reaction so whatever you begin with is what you end up with.
Is burning toast in the toaster physical or chemical?
Yes, it is. The process by which heat changes the molecules of the bread from white and soft to brown and crispy is a chemical change. A chemical change does NOT mean you have to add chemicals. It just means the chemicals (molecules) in the substance changed their chemistry. So slicing bread is a physical change, but toasting it is a chemical change.
What happens in a chemical change but not in a physical?
Molecules permanently change. In a physical change the effects are reversible.
What happens to the number of molecules of the gas when it is compressed?
It does not change, unless a chemical reaction in the gas happens.
What happens to atoms and molecules when a chemical change occurs?
They get rearranged to form new products.
Is it a chemical or physical change when energy in food molecules is transferred into molecules of ATP?
Chemical change.
Is it possible for the number of molecules to change as a result of a chemical reaction?
That happens all the time. Smaller molecules combine to form larger molecules; larger molecules break up into smaller molecules.
Is starch molecules that are formed from smaller glucose molecules a chemical or physical change?
The changing of extra glucose into starch is a chemical change.
What happens to the atom or molecules of a substance if it melts?
Nothing. Melting is a physical change and does not alter the chemical composition of a substance.
What does chemical change produce?
After a chemical change new molecules are obtained.
Is the breaking down of molecules a chemical or physical change?
It is a chemical change.
What happens to a sample of matter when it undergoes a chemical change?
The reactants are transformed in products, substances with another type of molecules and properties.
Why is there no chemical equation to describe what happens when water evaporates?
That's because there is no chemical change. In most cases, there is no chemical change when a substance evaporates. The exception is very long molecules, which may break apart during evaporation.
What does chemical produce?
After a chemical change new molecules are obtained.
