Matter can exist in solid, liquid, or gas states and undergo physical changes between these states with the addition or removal of heat. Matter is composed of either pure substances that have consistent properties, or mixtures that are combinations of substances that can be separated. Chemical changes alter the composition of matter and create new substances through reactions like combustion, oxidation, and fermentation.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
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.
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.
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.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
3. Discover
Everything around us is made of matter: our bodies, the air we
breathe, the ground we walk on and the water we drink.
Matter can´t be created or destroyed: it just changes. Some of
the changes it undergoes are chemical. Chemical reactions,
such as fermentation or combustion, change a substance into
a new one with different properties. How can we classify
matters?
Discover 1!
What states can matter exist in? Give some examples of matter
which change state. What causes these changes?
4. Discover 2!
What are mixtures?
What are pure
substances? What is
shown in the photo of
the cake?
What type of chemical
change is shown in
the photo of two
apples?
What is the difference
between a
heterogeneous and a
homogeneous
mixture?
What is fermentation?
How useful is it?
5. Analyse and
organise
Substances can be divided into pure
substances or mixtures.
Look at the different substances below. Classify
them into pure substances or mixtures in your
notebook.
aluminium, biscuits, coal, copper, milk, mud,
nitrogen, mayonnaise, silver, cardboard
6. Look at the objects in the photos below.
Identify the pure substances and the
mixtures.
7. Separating mixtures: heterogeneous
mixtures and homogeneous mixtures.
There are two types of mixtures: heterogeneous mixtures
and homogeneous mixtures.
In a heterogeneous mixture, we can see the individual
substances that make it up, so it is possible to separate
the substances easily.
In a homogeneous mixture we can´t see the individual
substance but we can still separate them.
We can separate substances in mixtures in different ways.
8. Separating mixtures
Magnetic separation: Magnets attract certain types of
metals. We can use Magnetic separation if we want to
separate mixtures that consist of substances attracted by
magnets and substances that are not.
Decantation: Heavy sediments in liquids sink to the
bottom of a container. Sand in a bucket of water collects
a the bottom of the bucket. When we decant a liquid, we
pour off the liquid so that the sediment remains in the
container. Two liquids of different density, such as oil and
water, can also be separated by decantation as the oil
floats on top of the water.
9. Separating mixtures
Filtration: filtration separates much smaller particles from a liquid or gas. A filter is
used to catch the particles, but allows the liquid to pass. Coffee grounds can be
separated from liquid in this way.
Filters in face masks are used to prevent germs or disease spreading through the air as
we breathe.
Evaporation: Solids which have been dissolved in a liquid can be separated using heat.
The liquid turns into vapour and the remaining sediment, the solids, can be collected.
Evaporation is used to remove water in salt evaporation ponds; the sun evaporates the
water and the salt is left behind.
Distillation: When two liquids evaporate at a different rate, such as water and ethanol,
the mixture can be separated using distillation. The liquid is heated and as the ethanol
has a lower boiling point than water, it evaporates first and forms vapour. This vapour is
then collected and cooled, resulting in pure ethanol.
Distillation is used to produce alcohol and in the petrochemical industry.
10. Physical changes: Change in state: solid,
liquid and gas.
Chemical changes: Chemical reactions change the properties of the
original substance, and a new substance is created. Chemical
changes go on around us all the time. Heat, oxygen and other
agents all cause chemical changes. Combustion, oxidation and
fermentation are irreversible changes. For example,
Combustion
Oxidation
Fermentation
Editor's Notes
Coal is made from the remains of plans and trees that lived about millions of years ago. They delayed and get buried to the ground and were compacted under rock layers. It is a hard brown or black rocklike mineral substance that is used for burning to generate heat.