2 different shaped molecules have the same composition, do they have the same chemical and physical propeties?

Question

Please explain, and sources would be nice.

Answer 1

What you are referring to is isomerism.

There are two main forms of isomerism: structural isomerism and stereoisomerism.

Structural isomers of a given formula have differences in the branching and can even have different functional groups (dramatically different chemistry). Their example of the n-propanol, iso propanol, and MEK all being isomers of C3H8O.

A stereoisomer is created when a double bond occurs in a carbon chain. This planer structure creates two distinct possible symmetries. We call these two different structural possibilities cis (same side) or trans (diagonal from each other). You’ve probably read about something called trans-fat in the news paper? This specific stereoisomer occurs when oil is chemically transformed into lard (hydrogenated). The natural fats found in animals and plants are the cis stereoisomer.

The Wiki article does a decent job explaining the isomerism concept. But yes shape matters.

http://en.wikipedia.org/wiki/Isomer

There is a third form of isomerism – optical isomerism. This is created when a molecule has a chiral carbon atom within its structure. A chiral carbon atom has four different structural elements bonded to it. And again there are two possible structural outcomes from this type of a situation.

http://en.wikipedia.org/wiki/Chirality_%28chemistry%29

Answer 2

With different shapes, the molecules will act differently. These molecules are called isomers.

Here's a quote from the source cited below:

"Isomer:
Just as early chemists were beginning to understand the nature of chemical compounds, a new twist complicated the picture. They found that the molecular formula for two different compounds can be the same. Because the atoms are connected in different ways, a single formula can represent more than one compound, each with its own distinct physical and chemical properties. "

Answer 3

no because physical properties always differ even tho the molecular composition is the same, as for the chemical the propeties there may be the same but as u know if some kinds of chemical changes may occur creating a whole new molicules but are bacicly made from the same

Answer 4

They have different properties. For example, all 6-carbon sugars have the composition C6H12O6, but their different shapes give them different properties. As another example, a protein changes function when its 3D shape is disrupted by high temperature, for example, even as its composition remains the same.

Answer 5

yes
are you in 8th grade because i am studying that too?