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Textbooks PDF (I-XII) Science ... Science : Rationalised Content: Prelims: Guide for using QR Code: Chapter 1: Chapter 2: Chapter 3: Chapter 4: Chapter 5: Chapter 6: Chapter 7: Chapter 8 Chapter 9: Chapter 10: Chapter 11 ... NCERT, Sri Aurobindo Marg, New Delhi-110016. dceta.ncert@nic.in +91 8800440559. Important Helpline Numbers. Women Helpline Number : 7827170170.
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Recall the law of conservation of mass that you studied in Class IX; mass can neither be created nor destroyed in a chemical reaction. That is, the total mass of the elements present in the products of a chemical reaction has to be equal to the total mass of the elements present in the reactants.
80 Science class, even if we are just asleep, this maintenance job has to go on. The processes which together perform this maintenance job are life processes. Since these maintenance processes are needed to prevent damage and break-down, energy is needed for them. This energy comes from outside the body of the individual organism.
n Collect the following solutions from the science laboratory– hydrochloric acid (HCl), sulphuric acid (H 2 SO 4), nitric acid (HNO 3), acetic acid (CH 3 COOH), sodium hydroxide (NaOH), calcium hydroxide [Ca(OH) 2], potassium hydroxide (KOH), magnesium hydroxide [Mg(OH) 2], and ammonium hydroxide (NH 4 OH).
160 Science Light – Reflection and Refraction CHAPTER10 W e see a variety of objects in the world around us. However, we are unable to see anything in a dark room. On lighting up the room, things become visible. What makes things visible? During the day, the sunlight helps us to see objects. An object reflects light that falls on it.
copies of the blueprints of body design. In Class IX, we learnt that the chromosomes in the nucleus of a cell contain information for inheritance of features from parents to next generation in the form of DNA (Deoxyribo Nucleic Acid) molecules. The DNA in the cell nucleus is the information source for making proteins.
NCERT textbook for class 10 Social Science.
n Class IX you have learnt about various elements. You have seen that elements can be classified as metals or non-metals on the basis of their properties. Think of some uses of metals and non-metals in your daily life. What properties did you think of while categorising elements as metals or non-metals?
