structer of matter notes
|compound||a substance made up of atoms of two or more different elements joined by chemical bonds|
|molecule|| a group of atoms that are held together by chemical forces |
#it is the smallest unit of matter that can exist by itself and keep all of a substance's chemical properties
|chemical bond|| forces that hold atoms or ions together in a compound. |
They can break and re-form during chemical changes.
|water|| the steps of water formation, |
1)when a mixture of a hydrogen gas and oxygen gas is heated chemical bonds break and rearrange.
2)new bonds form and water is made. hydrogen bonds pull water olecules together.
3)the properties of water are very different from the properties of H and O gases
|chemical structure||the way atoms in a compound are bonded it represents the structure of compounds|
|ball and stick modle|| *uses balls to represents atoms and sticks to represent chemical bonds|
*shows you how the atoms are arranged in a compound.
*shows you the bonds and angles b/t atoms.
|space filling model||*shows the relative amount of space each atom actually takes up but dont show bond lengths clearly|
|bonds|| *bonds can bend,stretch,and rotate without breaking|
*think of them as flexible springs rather than rigid sticks
|chemical structure and chemical properties|| *chemical structure determines the compound's properties|
*some substances are made of; large networks of bonded atom's, network of positives and negitive's ions, separate molecules.
|bonds|| have stronger bonds.QUARTZ|
*some are bonded weekly the molecules w/in the compounds are strongly attracted but the individual molecules are not. these substances tend to be soft and melt easily. SUGER
*some are made of ions- held together by strong bonds b/t ions with opposite charges. SALT