Atoms and Molecules

Do NOT make an ATOM an ION unless it tells you too! THIS MEANS- Do NOT make an ATOM stable unless it tells you to do so . To determine the charge of a picture of an atom look at the number of protons and electrons in the picture and determine the charge. (Examples are on the next slide.)

Review: What is the charge of this ATOM ? Just use the number of protons and electrons that are given .

What is the charge of this ATOM? Just use the number of protons and electrons that are given. -2

We will discuss: Chemical Symbol Atoms Elements Bonds Compounds Molecules Chemical Formulas Endothermic Reactions Exothermic Reactions

All matter is made of _____________. ,[object Object],Why would an atom combine with other atoms? To make the atom stable When an atom combines with another atom, this forms a ______________________? Molecule

[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Molecules ,[object Object],ATOMS

Molecules form when atoms join Element Compound There are two types of molecules

Element Molecule ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],2 2 3 3

Molecules Element H 2 If all atoms in a molecule are alike, then the molecule is classified as an _______________. ELEMENT

Molecules form when atoms join Compound The other type of molecule is a compound. Do you think that the atoms joined together in a compound are all the same? NO! The atoms are different.

Compound Molecules ,[object Object],[object Object],[object Object],[object Object],[object Object],2 DIFFERENT

Energy in Chemical Reactions ,[object Object],[object Object],[object Object],[object Object],[object Object]

Chemical Formulas- represent a molecule O C O The chemical formula of this model is CO 2

CO ,[object Object],2 C Chemical Symbol

The Chemical Formula use symbols and numbers called subscripts to show the elements and number of atoms that make up the molecule. ,[object Object],2 Chemical Symbols Subscript Note: there are 2 hydrogen atoms and 1 oxygen atom. The one behind the O is imaginary. How many atoms are there? _____ 3

[object Object],[object Object],[object Object],[object Object],2 2 1 Hydrogen Oxygen

CO represents? Co represents? Fe O represents? 2 3 1 atom of carbon and 1 atom of oxygen 1 atom of cobalt 2 iron atoms and 3 oxygen atoms

Chemical Formulas cont. ,[object Object],[object Object],[object Object],[object Object]

If a molecule is made out of one type of atom, it is called ,[object Object]

If a molecule is made out of different types of atoms it is? ,[object Object]

Chemical Equations ,[object Object],[object Object],[object Object]

Atoms and Molecules

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Atoms and Molecules