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Class 9th Science Ch 2 Revision Notes on Is matter around us Pure

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  Revision Notes on Is matter around us Pure What is a substance? Anything that cannot be broken into further particles by applying any physical processes is called a  Substance . Matter can be classified into two types of substances – Pure substances and Mixtures What is a pure substance? A substance that consists of only one type of particle is called a  Pure Substance .  For Example , Diamond, Salt, Sulfur, Tin.  What is a mixture? When we combine different substances into each other a mixture is formed.  For Example , Lemonade is a mixture of three substances, Lemon Juice, Sugar and Water. Which of these is a mixture or a pure substance? Water, Copper, Chocolate cake, Hydrogen, Soil, Air Mixture – Chocolate cake, Soil, Air Pure substance – Water, Copper, Hydrogen Types of Mixtures There are two categories of mixtures: Homogeneous Mixtures and Heterogeneous Mixtures Homogenous Mixtures When we add sugar, water and lemon juice together they all uniformly ...
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Class 10 Ch3 Metals and Nonmetals Revistion Notes

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  Metals:   Physical properties of metals, chemical properties of metals and non-metal oxide. Metals are the elements that conduct heat and electricity and are malleable and ductile. Examples are Iron (Fe), Aluminium (Al), Silver (Ag), Copper (Cu), Gold (Au), Platinum (Pt), Lead (Pb), Potassium (K), Sodium (Na), Calcium (Ca) and Magnesium (Mg) etc. Metals are the elements which form positive ions by losing electrons. Thus, metals are known as Electropositive Elements. Physical Properties of Metals Hardness:  Most of the metals are hard, except alkali metals, such as sodium, potassium, lithium, etc. are very soft metals. These can be cut by using a knife. Strength:  Most of the metals are strong and have high tensile strength. Because of this, big structures are made using metals, such as copper (Cu) and iron (Fe). (Except Sodium (Na) and potassium (K) which are soft metals). State:  Metals are solid at room temperature except for mercury (Hg). Sound:  Metal...
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Class 5th Science Chapter 2 Animal world written work

  Give short answer to the following questions 1. What is the natural place of living of an animal is called? Ans: Habitat 2. What are the breathing organs of fish or prawn? Ans: Gills 3. How does frog breathe when it is in water? Ans: Frogs use their thin skin to absorb oxygen in water. 4. How do the teeth of herbivores help them in eating? Ans: Teeth of herbivores help them in cutting and grinding the vegetation. 5. What are the functions of feathers? Ans: feathers help the birds to fly and protect them from cold.   Answer the following questions 1. How is a frog adapted to live both in water and on land? Ans: On land, frogs have gills which helped them breathing and in water they breathe through their thin skin which is present the under their mouth. 2. What features of a bird’s body help it to fly? Ans: birds have wings which help them to fly. Their bones are also light and hollow so they can fly easily. 3. How is a fish adapted to live in...
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