The document discusses the history of chemistry and some famous figures. It explains that an element is a substance that cannot be separated into different substances through normal chemical means. It then profiles several important historical figures in chemistry, including Democritus who first proposed the idea of atoms, Dalton who observed that elements combine in definite mass ratios, and Gay-Lussac who observed they combine in definite volume ratios. The document also introduces Proust and his law of definite proportions.
Laws of chemical combinations, prepared by Saliha RaisSaliha Rais
Ā
The presentation "Laws of chemical combinations" is prepared for grade 9, for educational purpose. the topics include all the four Laws of Chemical Combination.
An insight into the life of John Dalton, the English Chemist who provided the foundation for the atomic theory, thus leading to the the study of chemistry as a separate subject.
- Eisa Adil
Laws of chemical combinations, prepared by Saliha RaisSaliha Rais
Ā
The presentation "Laws of chemical combinations" is prepared for grade 9, for educational purpose. the topics include all the four Laws of Chemical Combination.
An insight into the life of John Dalton, the English Chemist who provided the foundation for the atomic theory, thus leading to the the study of chemistry as a separate subject.
- Eisa Adil
Dƶbereiner and Newlandās classification of elementsAfrah Aamer
Ā
A Powerpoint made for my school on Dƶbereiner and Newlandās classification of elements describing and explaining the different patterns and structures in which the Elements were arranged before we encountered the Periodic Table of Elements as we know them today.
Also a Fun Fact:
The 4 newest elements on the periodic table have just been named:
-Nihonium and symbol Nh, for the element with Z =113,
-Moscovium with the symbol Mc, for the element with Z = 115,
-Tennessine with the symbol Ts, for the element with Z = 117,
-Oganesson with the symbol Og, for the element with Z = 118.
Dƶbereiner and Newlandās classification of elementsAfrah Aamer
Ā
A Powerpoint made for my school on Dƶbereiner and Newlandās classification of elements describing and explaining the different patterns and structures in which the Elements were arranged before we encountered the Periodic Table of Elements as we know them today.
Also a Fun Fact:
The 4 newest elements on the periodic table have just been named:
-Nihonium and symbol Nh, for the element with Z =113,
-Moscovium with the symbol Mc, for the element with Z = 115,
-Tennessine with the symbol Ts, for the element with Z = 117,
-Oganesson with the symbol Og, for the element with Z = 118.
This powerpoint talks about the law Conservation of Mass. You will know who,when and how the discoverer found the Law of Conservation of mass. This is a work that is very good, because it has lots of images, example and you will undestand everything because the vocabulary is simple and anyone can understand it
The Differences Between Canada and the U.S. in Advertising, Promotions & Priv...This account is closed
Ā
In this presentation, Brenda Pritchard of Gowlings and Jason Gordon of Winston & Strawn discuss the differences between Canadian and U.S. rules for advertising, promotions, and privacy law.
Topics covered include:
-Contest and sweepstakes requirements
-Childrenās advertising/promotions
-Online privacy requirements
-Environmental advertising
-User-generated content
-Comparative advertising
Presentation is for the first chapter of class 11th Chemistry CBSE board. Presentation is having detailed description for some of the basic concepts like mole concept, matter in our surrounding etc.
Earth and Life Sciences for Senior High School by Duyanen and Andaya pages 176-179
My fun and colorful grade 11 report on Life Sciences 2nd semester of A.Y. 2016-2017 under Ms. Lagmay
June 3, 2024 Anti-Semitism Letter Sent to MIT President Kornbluth and MIT Cor...Levi Shapiro
Ā
Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
ā¢ The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
ā¢ The Committee on Oversight and Accountability is investigating the sources of funding and other support flowing to groups espousing pro-Hamas propaganda and engaged in antisemitic harassment and intimidation of students. The Committee on Oversight and Accountability is the principal oversight committee of the US House of Representatives and has broad authority to investigate āany matterā at āany timeā under House Rule X.
ā¢ The Committee on Ways and Means has been investigating several universities since November 15, 2023, when the Committee held a hearing entitled From Ivory Towers to Dark Corners: Investigating the Nexus Between Antisemitism, Tax-Exempt Universities, and Terror Financing. The Committee followed the hearing with letters to those institutions on January 10, 202
The Roman Empire A Historical Colossus.pdfkaushalkr1407
Ā
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesarās dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empireās birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empireās society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
Biological screening of herbal drugs: Introduction and Need for
Phyto-Pharmacological Screening, New Strategies for evaluating
Natural Products, In vitro evaluation techniques for Antioxidants, Antimicrobial and Anticancer drugs. In vivo evaluation techniques
for Anti-inflammatory, Antiulcer, Anticancer, Wound healing, Antidiabetic, Hepatoprotective, Cardio protective, Diuretics and
Antifertility, Toxicity studies as per OECD guidelines
Instructions for Submissions thorugh G- Classroom.pptxJheel Barad
Ā
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.
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!
How to Make a Field invisible in Odoo 17Celine George
Ā
It is possible to hide or invisible some fields in odoo. Commonly using āinvisibleā attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
Ā
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.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
Ā
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.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Ā
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
Francesca Gottschalk - How can education support child empowerment.pptxEduSkills OECD
Ā
Francesca Gottschalk from the OECDās Centre for Educational Research and Innovation presents at the Ask an Expert Webinar: How can education support child empowerment?
Acetabularia Information For Class 9 .docxvaibhavrinwa19
Ā
Acetabularia acetabulum is a single-celled green alga that in its vegetative state is morphologically differentiated into a basal rhizoid and an axially elongated stalk, which bears whorls of branching hairs. The single diploid nucleus resides in the rhizoid.
Palestine last event orientationfvgnh .pptxRaedMohamed3
Ā
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.
"Protectable subject matters, Protection in biotechnology, Protection of othe...
Ā
Law of definite proportion by natasha
1.
2. WHAT IS AN ELEMENT?
A substance which canāt be separated or divided into a
different substance by normal chemical means.
Each has characteristic properties. Humans have been
learning about the elements for a long time.
3. FAMOUS GUYS IN THE HISTORY OF
CHEMISTRY
Hammurabi ā 1700 BC Babylonian king wrote
of metals and heavenly bodies (but was
most famous for his ācodeā of laws)
Democritus ā 450 BC Ancient Greek said
atoms are the simplest form of matter
Aristotle -- 300 BC Ancient Greek philosopher
wrote of 4 elementsāearth, fire, water, air.
(Did not believe in atoms)
4. FAMOUS GUYS IN THE HISTORY OF
CHEMISTRY, CONTINUED
In the early 1800s, chemists began to combine
elements to form new substances; they
especially noted the quantities of elements
combining together.
Dalton observed:
8 lbs Oxygen combined with 1 lb Hydrogen 9 lbs water
5 lbs Nitrogen combined with 1 lb Hydrogen 6 lbs Ammonia
He concluded that elements combined in mass ratios.
5. FAMOUS GUYS IN THE HISTORY OF
CHEMISTRY, CONTINUED
Gay-Lussac observed that:
Hydrogen combined with Oxygen in a ratio of 2:1 by VOLUME to
form Water (now known as H2O)
Nitrogen and Oxygen combined in a ratio of 1:1 by VOLUME
to form Nitrous Oxide (NO, used in anesthesia)
He concluded that elements combine in volume ratios
6. FAMOUS GUYS IN THE HISTORY OF
CHEMISTRY, CONTINUED
Joseph Proust ā 100 lbs of copper combined with acid and
carbonates always yielded 180 pounds of green carbonate.
In 1799 he proposed the
Law of Definite Proportions:
elements combine in definite ratios when
forming compounds
He also proved that grape sugar is the same as the sugar in honey.
7. TEST YOURSELF
1. The first guy to come up with the idea of atoms was:
A) Aristotle B) John Dalton C) Democritus D) Joseph Proust
C) Democritus
8. TEST YOURSELF
2. The first guy to notice elements combining in ratios by mass was:
A) Aristotle B) John Dalton C) Democritus D) Joseph Proust
John Dalton
He noticed that 9 pounds of water was made of 8
pounds of oxygen and 1 pound of hydrogen
9. TEST YOURSELF
3. The first guy to notice elements combined in ratios by volume was:
A) Aristotle B) John Dalton C) Democritus D) Gay-Lussac
Gay-Lussac
He noticed that hydrogen and oxygen
always combined in a ratio of 2:1
by volume to make water
