2. The words in this sentence are made out of letters. There are only 26 letters to make words in English. Everything in this room (desks, pencils, people, air) is made out of elements. There are only 118 elements on Earth.

3. Only a few ingredients can make an infinite amount of recipes. Question: If a kitchen only had 118 different ingredients (like sugar, salt, flour, eggs, vanilla, carrots), could you make only 118 different recipes? Answer: No, you could make thousands, millions, billions of recipes (although some might not taste very good). In fact, you could make an infinite number of recipes! In the same way, our universe only has about 118 different elements. These are stuck together in different combinations and designs to make EVERYTHING in the universe.

4. Here are some examples of different types of elements C H O Oxygen Carbon Hydrogen S Sulfur N Nitrogen Na Sodium Cl Chlorine Mo Molybdenum

5. This table shows all the elements in the Universe. Its called the Periodic Table of the Elements, and is the most famous table in chemistry Everything is made of these different elements – including you!

6. Gold Gold The word atom comes from a Greek word that means unable to be cut Imagine you had a piece of gold that you then cut in half… …and then you cut one of these smaller pieces in half… … and you kept on cutting the leftover piece in half…

7. The word atom comes from a Greek word that means unable to be cut …and kept going… Eventually you would have 1 piece of gold left. If you cut it in half, you wouldnt have gold any more – youd have something else. This tiny, tiny single 1 piece of gold is called an atom of gold. An atom is the smallest particle of an element that acts like the element. An atom of gold

8. To find atoms you need to look very closely… No. 2 Wood magnified 10 times

9. The wood is made of cells Cells magnified 1000 times

10. Cells have parts inside them, like DNA DNA magnified 10,000,000 times

11. DNA and everything else are made of atoms O H Atoms C C H C C magnified 50,000,000 times Inside this magnifying glass are 7 atoms representing 3 elements (carbon, oxygen, and hydrogen)

12. Some chemicals contain more than 1 type of element; these chemicals are called compounds HH O HH O HH O HH O HH O HH O a drop of water Gold A piece of gold (a pure substance, not a compound) (a compound)

13. Salt is a compound: it is 1 chlorine atom attached to 1 sodium atom How to make salt Na Cl

14. OO Oxygen C OO Carbon Dioxide You breathe in oxygen You breathe out carbon dioxide

15. Although some chemical compounds like water, salt, and carbon dioxide are very simple, others are more complicated… HH O C OO Na Cl Water (H 2 0) Carbon Dioxide (CO 2 ) Salt (NaCl)

16. H HHHH Vitamin C looks like this: C CC C O O OO C O H H H C O 1.How many elements are in this compound? 2.How many atoms are in this compound?

17. Glucose C HH H HH H O O H O H O H O H H H C O HHH H C CC C H HH HH O H O H O H O HHHH C CC H Fructose HH O C C H H H H C O C 1.How many elements are in this compound? 2.How many atoms are in this compound?

18. Sucrose (sugar) C HH H H O H O H O H O H H H C O HHH H C CC C H H HH O H O H O HHHH C CC H HH O C C H H H H C O C O Sugar is just 1 glucose molecule combined with 1 fructose molecule

19. Saccharin: an artificial sweetener C CC C C C HH H H HH S N C OO O

20. Caffeine: a chemical found in tea, coffee, and cacao (the plant used to make chocolate) C C C C C N C N N N O C O HH H C HH H C HH H C 1.How many elements are in this compound? 2.How many atoms are in this compound?

21. H HHHHHHHHHHHH HHHHHHHH Capsaicin is the chemical that makes hot foods HOT! C C C C C C H H H H H H H O H CCCCCC CCCC C O N H O 1.How many elements are in this compound? 2.How many atoms are in this compound? C

22. Some materials are PURE SUBSTANCES: Matter made of the same type of chemical C H H H H O H O H O H O H H H C O H H H H C C C C H H H H O H O H O H H H H C C C H H H O C C H H H H C O C O C HH H H O H O H O H O H H H C O H H H H C CC C H H HH O H O H O H H H H C CC H H H O C C H H H H C O C O C H H H H O H O H O H O H H H C O H H H H C C C C H H H H O H O H O H H H H C C C H H H O C C H H H H C O C O C H H H H O H O H O H O H H H C O H H H H C C C C H H H H O H O H O H H H H C C C H H H O C C H H H H C O C O Water is a pure substance H H O H H O H H O H H O H H O H H O Sugar is a pure substance All elements are pure substances C C C C C C C C C C C C Carbon is just carbon Au Gold is just gold

23. Most materials are MIXTURES: Matter made of the many types of chemicals Air is a mixture Other mixtures include: Dirt Wood Bread Soda H H O O O O O N N N N N N N N N N C O O N N Ar

24. H C C C C C H O S N Na H H H C C H H O S C C H C C C C N N H H H H Cl C N

25. Benzene C CC C C C HH H H HH C CC C C C HH H H HH HHHH HH HH HH H These are some carbon and hydrogen atoms I made and then used to make the chemicals in this presentation.

26. How to Make Rust