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📌📌አገር አቀፍ የፈተና ቀናት📌📌 ✅ የሬሜዲያል (Remedial) ተማሪዎች እስከ ሰኔ 30 ✅የመውጫ ፈተና (Exit Exam) ፈተናው ከሐምሌ 3 እስከ 13 ✅የ2015 የ12ኛ ከፍል ማጠቃለያ ፈተና ከሐምሌ 19 እስከ 30 ✅የአዲስ አበባ ከተማ - የ8ኛ ክፍል  ፈተና ሰኔ 19 እና 20 እንዲሁም የ6ኛ ክፍል ፈተና ሰኔ 26 እና 27 📣Ministry of Education Join, Share 👇👇👇 https://t.me/tutorialpointeth

📚 Some Basic Concepts of #Chemistry 📚 #ESSLCE 📌Matter: Anything that exhibits inertia is called matter. The quantity of matter is its mass. 📝Classification of Matter:- Based on chemical composition of various substances. 📚Elements: ➖It is the simplest form of the matter. ➖Smallest unit of an element is known as atom. ➖Total number of the known elements is 118 out of which 98 elements occur naturally and 20 are formed by artificial transmutation. ➖Examples: Na, K, Mg. Al, Si, P, C, F, Br etc. 📚Compound: ➖It is a non-elemental pure compound. ➖Formed by chemical combination of two or more atoms of different elements in a fixed ratio. ➖Examples: H2O, CO2, C6H12O6 etc. 📚Mixture: ➖Formed by physical combination of two or more pure substances in any ratio. ➖Chemical identity of the pure components remains maintained in mixtures. ➖Homogeneous mixtures are those whose composition for each part remains constant. ➖Example, Aqueous and gaseous solution. ➖Heterogeneous mixtures are those whose composition may vary for each and every part. ➖Example, Soil and concrete mixtures. 📚Dalton’s Atomic Theory: ➖Every matter consists of indivisible atoms. ➖Atoms can neither be created nor destroyed. ➖Atoms of a given element are identical in properties ➖ Atoms of different elements differ in properties. ➖Atoms of different elements combine in a fixed ratio to form molecule of a compound. 📝Precision and Accuracy: ➖Precision: Closeness of outcomes of different measurements taken for the same quantity. ➖Accuracy: Agreement of experimental value to the true value ➖Law of conservation of mass: “For any chemical change total mass of active reactants are always equal to the mass of the product formed” ➖Law of constant proportions: “A chemical compound always contains same elements in definite proportion by mass and it does not depend on the source of compound”. ➖Law of multiple proportions: “When two elements combine to form two or more than two different compounds then the different masses of one element B which combine with fixed mass of the other element bear a simple ratio to one another” ➖Law of reciprocal proportion: “ If two elements B and C react with the same mass of a third element (A), the ratio in which they do so will be the same or simple multiple if B and C reacts with each other”. Join, Share 👇👇👇 https://t.me/tutorialpointeth

✅10 Important Questions (FAQs) for Biology ESSLCE Preparations 👇📚📚📚📚📚📚📚📚📚📚📚 1⃣ What is the process by which green plants use sunlight to synthesize food from carbon dioxide and water. 2⃣ Which of the following hormones is responsible for the opening and closing of stomata in plants? 3⃣ What is the name of the process by which water moves through a plant from the roots to the leaves? 4⃣ What is the type of tissue responsible for the transport of water and minerals in plants. 5⃣ What is the process by which asexual reproduction takes place in fungi. 6⃣ Which of the following is the largest gland in the human body? 7⃣ What is the type of blood cells responsible for carrying oxygen to the tissues in the body. 8⃣ Name the hormone responsible for milk production in female mammals. 9⃣ What is the name of the process by which the body maintains a stable internal environment despite changes in the external environment? 🔟 Name the process by which the egg is released from the ovary in female mammals. ✅Answers 1⃣Photosynthesis 2⃣Abscisic acid 3⃣Transpiration 4⃣Vascular tissue 5⃣Budding 6⃣Liver 7⃣Red blood cells 8⃣Prolactin 9⃣Homeostasis 🔟Ovulation Join, Share 👇👇👇 https://t.me/tutorialpointeth