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Answer:We use in our daily life a large number of substances such as lemon, tamarind, common salt ,sugar and vinegar. Many substances that you encounter in your daily life have different properties. One major difference between substances is whether they are acidic or basic.Some of the substances like Lemon juice, Vinegar, Curd, Grapes ,Unripe mango, Sugar, Tamarind taste sour, some taste bitter,some taste sweet and some taste salty.Acids And BasesCurd, lemon juice, orange juice and vinegar taste sour. These substances taste sour because they contain acids. The chemical nature of such substances is acidic. The word acid comes from the Latin word acere which means sour. The acids in these substances are natural acids.Baking soda does not taste sour it means, that it has no acids in it. It is bitter in taste. If you rub its solution between fingers, it feels soapy. Substances like these which are bitter in taste and feel soapy on touching are known as bases. The nature of such substances is said to be basic.Special type of substances are USED to test whether a substance is acidic or basic. These substances are known as indicators. The indicators change their colour when added to a solution containing an acidic or a basic substance. Turmeric, litmus, CHINA rosepetals (Gudhal), etc., are some of the naturally occurring indicators.Natural Indicators Around UsLitmus: A Natural DyeThe most commonly used natural indicator is litmus. It is extracted from lichens (. It has a mauve (purple) colour in distilled water. When added to an acidic solution, it turns red and when added to a basic solution, it turns BLUE. It is available in the form of a solution, or in the form of strips of paper, known as litmus paper. Generally, it is available as red and blue litmus paper .ActivityMix some water with lemon juice in a plastic cup/tumbler/test tube.Put a drop of the above solution on a strip of the red litmus paper with the help of a dropper. Is there any change in colour?Repeat the same exercise with the blue litmus paper.Note down if there is any change in colour.Perform the same activity with the following substances:Tap water, detergent solution, aerated drink, soap solution, shampoo, common salt solution, sugar solution, vinegar, baking soda solution, milk of magnesia, washing soda solution, lime water. If possible make solutions in distilled water.The solutions which do not change the colour of either red or blue litmus are known as neutral solutions. These substances are neither acidic nor basicTurmeric :Natural IndicatorActivityTake a tablespoonful of turmeric powder. Add a little water and make a paste.Make turmeric paper by depositing turmeric paste on blotting paper/filter paper and drying it. Cut thin strips of the yellow paper obtained.Put a drop of soap solution on the strip of turmeric paper.You can prepare a card for your mother on her birthday. Apply turmeric paste on a sheet of plane white paper and dry it. Draw a beautiful flower with soap solution with the help of a cotton bud. You will get a beautiful greeting card.To prepare limewater, dissolve some lime (chuna) in water in a bottle. Stir the solution and keep it for some time. Pour a little from the top. This is lime water.You may try solutions of other substances also.China ROSE as IndicatorActivityCollect some China rose (Gudhal ) petals and place them in a beaker. Add some warm water. Keep the mixture for some time till water becomes coloured. Use the coloured water as an indicator. Add five drops of the indicator to each of the solutions.A solution of china rose turns green in a basic solution, and bright pink or magenta in an acidic solution.ActivityThe teacher is requested to get the following dilute chemicals from his/her school laboratory or from a nearby school: hydrochloric acid, sulphuric acid, nitric acid, acetic acid, sodium hydroxide, ammonium hydroxide, calcium hydroxide (lime water).Acid RainAs the name indicates the rain containing excess of acids is called an acid rain. Where do these acids come from? The rain becomes acidic because carbon DIOXIDE, sulphur dioxide and nitrogen dioxide (which are released into the air as pollutants) dissolve in rain drops to form carbonic acid, sulphuric acid and nitric acid respectively. Acid rain can cause damage to buildings, historical monuments, plants and animals.Precaution:Great care should be taken while handling laboratory acids and bases because these are corrosive in nature, irritating and harmful to skin.SummaryAcids are sour in taste. Bases are bitter in taste and soapy to touch.Acid turns blue litmus red. Bases turn red litmus blue.Solutions of substances that show different colour in acidic, basic and neutral solutions

1.The motion of the NEEDLE of sewing motion is Periodic OSCILLATORY motion.2.The hand of the clock is Circular Motion3.This is a LINEAR motion4.When we write on the blackboard that motion is Frictional motion5.Children sitting in a MARRY GO round have non-uniform circular motionhope it helps you:)

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The THREE MAJOR types of POLLUTION are air pollution, water pollution, and LAND pollution.

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it is process of DESTRUCTION of metal by chemicalsExplanation:it can PREVENTED by painting on itplz MARK me brainlist

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The ACTION of CULTIVATING,LAND or the STATE of being CULTIVATED.

Explanation:NON reversible: 1) the FALLEN tree                          2) the BURNT firecrackerreversible: 1) pls send the image again its not that clear

Chemical theory SEEKS to describe the underlying physical phenomena that give rise to chemistry and the PROPERTIES of atoms, molecules, and materials. The resultant theories and models TYPICALLY lead to mathematical problems that are so complex, they can only be SOLVED using computer-based techniques.

saster, you FACE the danger of death or physical injury. You MAY also lose your home, possessions, and community. Such stressors place you at risk for emotional and physical health problems. Stress reactions after a DISASTER look very much like the common reactions SEEN after any type of TRAUMA.

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Metals LIKE aluminium, iron and zinc do not REACT EITHER with cold or hot water. But they react with STEAM to form the metal oxide and hydrogen. Metals such as lead, copper, silver and GOLD do not react with water at all.

itive terminal (+) of one cell should always be connected to NEGATIVE terminal (-) of another cell.The component to be Added is Switch.A device designed to open or close a CIRCUIT under controlled conditions is called a switch. The terms “open” and “closed” refer to switches as well as ENTIRE circuits. An open switch is one without CONTINUITY and CURRENT cannot flow through it.

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सजीव कोशिकाओं में भोजन के आक्सीकरण के फलस्वरूप ऊर्जा उत्पन्न होने की क्रिया को कोशिकीय श्वसन कहते हैं।[1] यह एक केटाबोलिक क्रिया है[2] जो आक्सीजन की उपस्थिति या अनुपस्थिति दोनों ही अवस्थाओं में सम्पन्न हो सकती है। इस क्रिया के दौरान मुक्त होने वाली ऊर्जा को एटीपी नामक जैव अणु में संग्रहित करके रख लिया जाता है[3] जिसका उपयोग सजीव अपनी विभिन्न जैविक क्रियाओं में करते हैं। यह जैव-रासायनिक क्रिया पौधों एवं जन्तुओं दोनों की ही कोशिकाओं में दिन-रात हर समय होती रहती है। कोशिकाएँ भोज्य पदार्थ के रूप में ग्लूकोज, अमीनो अम्ल तथा वसीय अम्ल का प्रयोग करती हैं जिनको आक्सीकृत करने के लिए आक्सीजन का परमाणु इलेक्ट्रान ग्रहण

If something is potable that means it's SAFE to drink. ... The word comes from the Latin potare, MEANING "to drink." Not only did the Romans COME up with that word; they built some of the world's first AQUEDUCTS, above-ground channels that BROUGHT potable water from the mountains to the cities.

wth of the parts of plants in response to the force of gravity. The upward GROWTH of plant shoots is an INSTANCE of negative geotropism ; the DOWNWARD growth of roots is POSITIVE geotropism.

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nthesis is the process used by plants, algae and certain BACTERIA to harness energy from sunlight and turn it into chemical energy. Here, we describe the GENERAL principles of photosynthesis and HIGHLIGHT how SCIENTISTS are studying this natural process to HELP develop clean fuels and sources of renewable energy.

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सूर्य की उर्जा को दो प्रकार से विदुत उर्जा में बदला जा सकता है। पहला प्रकाश-विद्युत सेल की सहायता से और दूसरा किसी तरल पदार्थ को सूर्य की उष्मा से गर्म करने के बाद इससे विद्युत जनित्र चलाकर सौर उर्जा सबसे अच्छा उर्जा है। यह भविष्य में उपयोग करने वाली उर्जा है।

tion:A telescope is a tool that astronomers use to SEE faraway OBJECTS. Most telescopes, and all large telescopes, work by using CURVED MIRRORS to gather and focus LIGHT from the night sky.

the product of the COMPONENT of the force in the DIRECTION of the displacement and the MAGNITUDE of this displacement.The SI unit of work is the joule (J), which is defined as the work done by a force of 1 Newton in moving an object through a distance of 1 meter in the direction of the force. Joule and erg both are units of work done. An erg is the amount of work done by APPLYING a force of one dyne for a distance of one centimeter. In the CGS base units, it will be one gram centimeter-squared per second-squared. Whereas joule is the amount of work done by applying a force of one newton for a distance of one meter.

The reaction of an ACID and a base is CALLED a neutralization reaction. acid + base → water + saltExample : 2HNO3(aq) + Ba(OH)2(aq) → 2H2O(ℓ) + Ba(NO3)2(aq)HOPE it helps!!

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February 28, the day on which the discovery of Raman Effect was was officially announced by Sir. CV. Raman, is celebrated as 'National Science Day' in India. In the eve of National Science day, 2013, we remember Sir. CV. Raman, and his vision on scientific progress in IndiaSir CV. RamanThe 2010 report of the Science Advisory Council to Prime Minister of India is titled “India as a Global Leader in Science”. It is interesting to see that the initial SKEPTICISM this title evokes in the minds of readers (about the validity of the claim) is shared by the authors. In the foreword to this vision-document, Dr MANMOHAN Singh, the Prime Minister asserts that it makes a REALISTIC assessment of the opportunities that lie ahead and the challenges that the country face, in developing strong capabilities and acquiring global leadership in the area of science. The report in its very first page critically examines the validity of the growing perception around the world that India is one of the potential global leaders in science. Quoting a statement from the 2005 report of US National Academy of Science (NAS), that ‘the emergence of India and China as global leaders in science would pose challenges to the position held by US in the world of science’, it cautions the readers against getting carried away and categorically asserts that India is yet to become a major force in global science. The report goes on to illustrate that India has not produced any perceptible peak in the global distribution of NUMBER of scientific papers produced.India’s strife towards building its own science began in the last decades of 19th century. This so called renaissance gave birth to a few world-class scientists in the country and one among them went on to bring home its first Nobel prize in science. Sir CV. Raman was a torch bearer of the Indian renaissance who strived till his last breath to cultivate true science in this country. This article takes a re-look at his vision and tries to assess the country’s progress in the lines envisioned by Raman.The Nobel Prize won by C.V. Raman in 1930 for Physics was also India’s last one in science. It took 38 years for yet another scientist of Indian origin, to qualify this distinction. Har Gobind Khurana (1968), S. Chandrasekhar (1983) and Venkitaraman Ramakrishnan (2009) followed Raman’s foot prints but built their research career in foreign lands affiliated to foreign universities; hence their medals can’t be counted as India’s. In this context, it may be noted that independent India is devoid of any Nobel medal in science. Table 1 compares the number of Nobel medals in science, per capita GDP and Human Development Index of BRICS countries. India ranks lowest in HDI and Per capita GDP. While acknowledging the country of origin of the medallist, the Nobel foundation also mentions to which country and institution the person has been affiliated at the time of the award. In this count, India and Russia are the only BRICS nations with any Nobel laureate by affiliation. Russia has two medals and India has one. But for Raman, India wouldn’t have been in that list.Mark me as brainliest........✌✌✌

This important concept is called the law of conservation of momentum. It describes how when there are no external forces, the momentum of a SYSTEM doesn't change. In EQUATION form, momentum = mass * velocity. To INCREASE the momentum of an object, you need to increase its mass, its velocity, or both.Please mark me the BRAINLIEST

जीव आरक्षित विस्तार वनस्पति और प्राणियों के लिए अभिवादन है EXPLANATION:यह सही हैं

Explanation:Curd and other sour substances CONTAINS acids which can react with the metals of brass and copper VESSELS to form toxic (poisonous) metal compounds which can CAUSE food POISONING and damage our health.

tion:Through COMBINING TWO or more substances, a mixture is produced. A homogeneous SOLUTION tends to be IDENTICAL, no matter how you sample it. Homogeneous mixtures are sources of water, saline solution, some alloys, and bitumen. Sand, oil and water, and chicken noodle soup are examples of HETEROGENEOUS mixtures.

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