### percentage composition.pptx

1. Percentage Composition of Substances
2. Daily Task 1.Calculate the percentage composition of a substance given the chemical formula
3. 3 How Do You Make Fireworks of Different Colors? Two thousand years ago, a cook mixed three ingredients very common in any kitchen: potassium nitrate (food preservative), sulphur and charcoal. Mixed and and heated, they go off exploding on a huge bang. This is basically gunpowder. If this mixture is put on a cane, pressure builds up giving rise to a bigger explosion. Originally, potassium nitrate was used. Potassium cations are responsible of a white color. If different salts are used instead, with different metals as cations, you get the different colors. For example, strontium salts give red colors. Iron compounds give gold-colored fireworks. Also, sodium gives yellow, barium gives green and copper gives blue.
4. Why do you need to know the nutritional information provided on the packaged food labels?
5. What do you think a chemist do when he discovered a new compound? 6
6. Percentage Composition. -the percentage by mass of elements present in a compound.
7. Percentage Composition requires knowing the mass of the entire molecule/compound, then the mass of its components 8
8. % by mass= mass of element mass of compound x 100
9. Example: What are the percentage composition of sodium and chlorine in Sodium Chloride? 10 % Na= mass of Na mass of NaCl x 100 First,find the molar mass: Mass of Na- 23 g/mol Mass of Chlorine- 35 g/mol _________________________ 58 g/mol
10. 11 % Na= 23 g/mol 58 g/mol =0.3965 x 100 x 100 =39.65 % or 40 % % Cl= 35 g/mol 58 g/mol = % Na= 23 g/mol 58 g/mol =0.3965 x 100 100 x 0.603 % or 60 %
11. For both plants and humans, glucose is like the fuel for a machine. Plants produce sugar in their leaves in the form of glucose C6H12O6 Determine the percentage composition of glucose C6H12O6
12. . The experiment conducted by Henry Mosely on the radioactive emissions of elements, found a way of counting the number of protons. atomic number-equal to the number of protons of an element -expressed as Z -identifies an element,also equal to # of electron
13. . mass number-combined number of protons and neutrons -expressed as A. Mass # - proton= neutron
14. .
15. Atoms, in their most stable state are neutral with an equal number of protons and electrons. Something to think about So, let us say an atom has 5 electrons, how many protons does this atom have?
16. One more time: How about if the atom has 64 protons, how many electrons does this atom have?
17. One more time: # of protons= # of electrons= # of neutrons= Atomic #= Mass number # =
19. Enumeration 1-9 List the 3 subparticles of an atom with their charges and location, (in or outside the nucleus) 10. If a neutral atom has 4 electrons, how many protons are there?
20. True or False 11. A neutral atom has a negative one charge. 12. In a neutral atom, if there are 6 electrons there are also 6 protons. 13. A table, a chair, a sweater contain charges. 14. Electrons are transferred when a material is rubbed with another material and this is called static electricity. 15. When a negative charged object is put near to a positive charged object, the two objects will repel. 21
21. Maps our office 22
22. 89,526,124 Whoa! That’s a big number, aren’t you proud? 23
23. 89,526,124\$ That’s a lot of money 100% Total success! 185,244 users And a lot of users 24
24. Our process is easy first second last 25
25. Let’s review some concepts Yellow Is the color of gold, butter and ripe lemons. In the spectrum of visible light, yellow is found between green and orange. Blue Is the colour of the clear sky and the deep sea. It is located between violet and green on the optical spectrum. Red Is the color of blood, and because of this it has historically been associated with sacrifice, danger and courage. 26 Yellow Is the color of gold, butter and ripe lemons. In the spectrum of visible light, yellow is found between green and orange. Blue Is the colour of the clear sky and the deep sea. It is located between violet and green on the optical spectrum. Red Is the color of blood, and because of this it has historically been associated with sacrifice, danger and courage.
26. You can insert graphs from Google Sheets 27
27. Android project Show and explain your web, app or software projects using these gadget templates. Place your screenshot here 28
28. Place your screenshot here 29 iPhone project Show and explain your web, app or software projects using these gadget templates.
29. Place your screenshot here 30 Tablet project Show and explain your web, app or software projects using these gadget templates.
30. Place your screenshot here 31 Desktop project Show and explain your web, app or software projects using these gadget templates.
31. Thanks! Any questions? You can find me at: @username user@mail.me 32
32. Credits Special thanks to all the people who made and released these awesome resources for free: × Presentation template by SlidesCarnival × Photographs by Unsplash × Watercolor textures by GraphicBurguer 33
33. Presentation design This presentation uses the following typographies and colors: × Titles: Lato Thin × Body copy: Lato Light You can download the fonts on this page: http://www.latofonts.com/lato-free-fonts/ You don’t need to keep this slide in your presentation. It’s only here to serve you as a design guide if you need to create new slides or download the fonts to edit the presentation in PowerPoint® 34
34. SlidesCarnival icons are editable shapes. This means that you can: ● Resize them without losing quality. ● Change fill color and opacity. Isn’t that nice? :) Examples:
35. Now you can use any emoji as an icon! And of course it resizes without losing quality and you can change the color. How? Follow Google instructions https://twitter.com/googledocs/status/730087240156643328 ✋👆👉👍👤👦👧👨👩👪💃🏃💑❤😂 😉😋😒😭👶😸🐟🍒🍔💣📌📖🔨🎃🎈 🎨🏈🏰🌏🔌🔑 and many more... 😉 36

### Editor's Notes

1. As a chemist,u must know what elements are present in a compound and in what percentage.