This presentation talks about the application of Law of Conservation of Mass to Chemical Equations. It has a step-by-step process of balancing equations with a bit of mole-mass conversions.
Introduction to redox reactions
References
Tindale, Ritchie et al, 2014, Chemistry for CSEC 2nd Edition, Nelson Thornes. p156-159
Electron Transfer in Redox Reactions Todayhttps://www.sewanhakaschools.org
This presentation talks about the application of Law of Conservation of Mass to Chemical Equations. It has a step-by-step process of balancing equations with a bit of mole-mass conversions.
Introduction to redox reactions
References
Tindale, Ritchie et al, 2014, Chemistry for CSEC 2nd Edition, Nelson Thornes. p156-159
Electron Transfer in Redox Reactions Todayhttps://www.sewanhakaschools.org
contains explanation of redox reaction, differences between oxidation and reduction, related pictures and solved examples along with test your understanding section.
Lecture materials for the Introductory Chemistry course for Forensic Scientists, University of Lincoln, UK. See http://forensicchemistry.lincoln.ac.uk/ for more details.
An oxidation-reduction (redox) reaction is a type of chemical reaction that involves a transfer of electrons between two species. An oxidation-reduction reaction is any chemical reaction in which the oxidation number of a molecule, atom, or ion changes by gaining or losing an electron.
This chapter tell you about the reduction in the Oxidation reaction there he is revolutions their transfer of ions and also about the oxidizing agent in the reducing agent
Includes a discussion of Voltaic and electrolytic cells, the Nernst equation and the relationship between electrochemical processes, chemical equilibrium and free energy.
**More good stuff available at:
www.wsautter.com
and
http://www.youtube.com/results?search_query=wnsautter&aq=f
oxidation-reduction reactions (redox reactions) are reactions in which electrons are
lost by an atom or ion in one reactant and gained by an atom or ion in another reactant. Although
electrons are gained and lost in these reactions, the balanced equation for a redox reaction does
not show the electrons that are being transferred. In order to tell whether a redox reaction has
occurred or not, we need a way to keep track of electrons. The best way to do so is by assigning
oxidation numbers to the atoms or ions involved in a chemical reaction. Oxidation numbers are
hypothetical numbers assigned to an individual atom or ion present in a substance using a set of
rules. Oxidation numbers (or oxidation states as they are also called) can be positive, negative, or
zero. It is VERY IMPORTANT to remember that oxidation numbers are always reported for one
individual atom or ion and not for groups of atoms or ions. The following rules are used to
assign oxidation numbers. Chem 1115 students will have these rules available on exams. Chem
1215 students must memorize these rules. Chem 1115 Chem 1215 Tutorial List Oxidation
Number Rules The oxidation number for an atom in its elemental form is always zero. A
substance is elemental if both of the following are true: only one kind of atom is present charge =
0 Examples: S8: The oxidation number of S = 0 Fe: The oxidation number of Fe = 0 The
oxidation number of a monoatomic ion = charge of the monatomic ion. Examples: Oxidation
number of S2- is -2. Oxidation number of Al3+ is +3. The oxidation number of all Group 1A
metals = +1 (unless elemental). The oxidation number of all Group 2A metals = +2 (unless
elemental). Hydrogen (H) has two possible oxidation numbers: +1 when bonded to a nonmetal -1
when bonded to a metal Oxygen (O) has two possilbe oxidation numbers: -1 in peroxides (O22-
)....pretty uncommon -2 in all other compounds...most common The oxidation number of
fluorine (F) is always -1. The sum of the oxidation numbers of all atoms (or ions) in a neutral
compound = 0. The sum of the oxidation numbers of all atoms in a polyatomic ion = charge on
the polyatomic ion. When assigning oxidation numbers to the elements in a substance, take a
systematic approach. Ask yourself the following questions: Is the substance elemental? Is the
substance ionic? If the substance is ionic, are there any monoatomic ions present? Which
elements have specific rules? Which element(s) do(es) not have rules? Use rule 8 or 9 from
above to calculate these. Example: Determine the oxidation number of each element in Na2SO4.
Is the substance elemental? No, there are three elements present. Is the substance ionic? Yes,
because metal + non-metal = ionic. If the substance is ionic, are there any monoatomic ions
present? Yes, the sodium ion (Na+) is monoatomic. Therefore, the oxidation number of Na is +1.
Which elements have specific rules? Oxygen has a rule (-2 in most compounds). Oxidation
number of O = -2. Which element(s) do(es) not.
وسيلة تربويّة يمكن استخدامها في الصفوف الثانويّة في مواد علم الاجتماع و علم الاقتصاد و التربية المدنيّة. يتعرّف المتعلّم من خلالها على المعايير السليمة و الايجابيّة للمجتمع كما يستطيع ان يقيّم من خلال هذه المعرفة وضع بلاده .
This presentation is used to explain the Chemical Reaction Lesson for Grade Eight Students. It uncovers some of students' misconceptions in this domain.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
This presentation provides a briefing on how to upload submissions and documents in Google Classroom. It was prepared as part of an orientation for new Sainik School in-service teacher trainees. As a training officer, my goal is to ensure that you are comfortable and proficient with this essential tool for managing assignments and fostering student engagement.
Palestine last event orientationfvgnh .pptxRaedMohamed3
An EFL lesson about the current events in Palestine. It is intended to be for intermediate students who wish to increase their listening skills through a short lesson in power point.
The French Revolution, which began in 1789, was a period of radical social and political upheaval in France. It marked the decline of absolute monarchies, the rise of secular and democratic republics, and the eventual rise of Napoleon Bonaparte. This revolutionary period is crucial in understanding the transition from feudalism to modernity in Europe.
For more information, visit-www.vavaclasses.com
How to Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
2. Engage
What does the word oxidation mean?
a. reaction with oxygen
b. losing electron during reaction
c. gaining electron during reaction
3. Explore
1. Name the materials used
in the first diagram
2. Describe what you see
in the second diagram?
3. Mg is oxidized. From this
reaction explain the meaning
of oxidation.
4. Explain
What does the word oxidation mean?
In ancient times, the word oxidation is related
to the reaction with oxygen. When an atom
reacts with oxygen it tends to lose electrons
and it is said to be oxidized. Now, all atoms
that lose electrons in a chemical reaction are
said to be oxidized or making oxidation.
5. Oxidation Number
It indicates if electrons are lost or gained by
an atom during a chemical reaction.
2Mg0 + O0
2 2 [ Mg+2 O-2]
Mg lost 2 electrons while Oxygen gained 2
electrons. The number above each atom/ion
is its oxidation number.
6. Oxidation number Rules
Rule 1: In its pure elemental form, an atom
has an oxidation number of zero
8. Oxidation number Rules
Rule 3: The oxidation number of metals is +1
in group 1 and +2 in group 2
9. Oxidation number Rules
Rule 4: Hydrogen has two possible oxidation
numbers: +1 (if bonded with nonmetals) and
-1 (if bonded with metals)
10. Oxidation number Rules
Rule 5: Combined Al has oxidation number
+3, and combined F and Cl have oxidation
number -1 each.
Rule 6: Oxygen has oxidation number -2
except in peroxides it will be -1.
11. Oxidation number Rules
Rule 7: The algebraic sum of oxidation
numbers of atoms in a compound equals to
zero.
Rule 8: The algebraic sum of the oxidation
numbers of the atoms in a polyatomic ion
equals to its charge.
12. Apply
What is the oxidation state of chromium in
CrCl3?
This is a neutral compound so the sum of the oxidation
states is zero. Chlorine has an oxidation state of -1. If
the oxidation state of chromium is n:
n + 3(-1) = 0
n = +3 (Again, don't forget the + sign!)
13. Apply
What is the oxidation state of chromium in
the dichromate ion, CrO2-?
27
The oxidation state of the oxygen is -2, and the sum of
the oxidation states is equal to the charge on the ion.
Don't forget that there are 2 chromium atoms present.
2n + 7(-2) = -2
n = +6
14. Oxidation number
If an atom loses electrons, its oxidation number
increases, so we can say that this atom undergoes
oxidation.
If an atom gains electrons, its oxidation number
decreases, so we can say that the atom undergoes
reduction.
OIL RIG: Oxidation Is Loss; Reduction Is Gain (of
electrons).
15. Redox Reactions
They are chemical reactions through which
atoms gain and lose electrons changing their
oxidation number after the chemical reaction.
16. Apply
Is the following reaction Redox reaction?
Mg + 2HCl MgCl2 + H2
0 +1 -1 +2 -1 0
Mg + 2HCl MgCl2 + H2
Mg loses 2 e
H gains 1 e
Then this reaction is redox reaction
17. Extend
Have ever thought that this occurs in living
cells??
Redox reactions occur in photosynthesis and
cellular respiration.
18. Evaluate
Consider the following reaction:
Fe2O3 + 3CO 2Fe + 3CO2
1. Determine the oxidation number of each of
Fe, O and C before and after the reaction.
2. Deduce if this reaction is a redox reaction.