Class 10th Ncert Exemplar Science Zip
Discussion forum is being maintained to discussion the doubts of users in educations. Chapter 5: Periodic Class 10th Ncert Exemplar Science Zip Class 10th Ncert Exemplar Science Zip Classification of Elements. The main points in Chapter 3: Metals and Non � Metals. Elements can be classified as metals and non-metals. Metals are lustrous, malleable, ductile and are good conductors of heat and electricity. They are solids at room temperature, except mercury which is a liquid.
Metals can form positive ions by Class 10th Ncert Exemplar Science Zip losing electrons to non-metals. Metals combine with oxygen to form basic oxides.
Aluminium oxide and zinc oxide show Class Ncert Exemplar 10th Zip Science the properties of both basic as well as acidic oxides. These oxides are known as amphoteric oxides. Different metals have different reactivities with water and dilute acids. A list of common metals arranged in order of 10th Science Class Ncert Exemplar Zip their class 10th ncert exemplar science zip reactivity is known as an activity series. Metals above hydrogen Ncert Zip 10th Exemplar Science Class in the Activity series can displace hydrogen from dilute acids.
A more reactive 10tj displaces a less reactive Class 10th Ncert Exemplar Science Zip metal from its salt solution. Metals occur in nature as free elements or in the form of their compounds. The extraction of metals from their ores and then refining them for use is known as Class 10th Ncert Exemplar Science Zip metallurgy. An alloy ncwrt a homogeneous mixture of two or more metals, or a metal and a non-metal. The Class 10th Ncert Exemplar Science Zip surface of some metals, such as iron, is corroded when they are exposed to moist air for 10th Class Ncert Exemplar Science Zip a long period of time.
This phenomenon is known as corrosion. Non-metals have properties opposite to that of metals. They are neither malleable nor ductile. They are bad conductors of heat and electricity, except for Class 10th Ncert Exemplar Science Zip graphite, which sciience electricity. Non-metals form negatively charged ions by gaining electrons when reacting class 10th ncert exemplar Class 10th Ncert Exemplar Science Zip science zip metals.
Non-metals form oxides which are either acidic or neutral. Non-metals do not displace hydrogen from Class 10th Ncert Exemplar Science Zip dilute acids. They react with hydrogen to form hydrides. Movement of various types can be taken as Class 10th Ncert Exemplar Science Zip an indication of life.
The maintenance of life requires processes like nutrition, respiration, transport of materials within the body and excretion of waste products.
Autotrophic nutrition ncdrt the intake of simple inorganic materials from the environment and using an external energy source like the Sun to synthesise complex high-energy organic material. Heterotrophic nutrition involves Class 10th Ncert Exemplar Science Zip the intake of complex material prepared by other organisms.
In human beings, the food eaten is broken Class 10th Ncert Exemplar Science Zip down by various steps along the alimentary canal and the digested food is absorbed in the small intestine Class 10th Ncert Exemplar Science Zip to be sent to all cells in the body.
During the process of respiration, complex organic compounds such as glucose are broken down to provide energy in the form of ATP. ATP is used to provide Class 10th Ncert Exemplar Science Zip energy for other reactions in the cell. Respiration may be aerobic or anaerobic. Aerobic respiration makes more energy available to the organism. In human wcience, the transport of materials such as oxygen, carbon dioxide, food and excretory products is a function of the circulatory sciencd.
The circulatory system consists of the heart, blood Class 10th Ncert Exemplar Science Zip and blood vessels. In highly differentiated plants, transport of water, minerals, food and other materials is a function of the class 10th ncert exemplar science zip tissue which consists of xylem and phloem. In human beings, excretory products in the form of soluble nitrogen compounds are removed by the nephrons in the kidneys. Plants use class 10th ncert exemplar science zip variety of techniques to get rid of waste material.
For Class 10th Ncert Exemplar Science Zip Class 10th Ncert Exemplar Science Zip example, waste material may be stored in the class 10th ncert exemplar science zip or as gum Class Exemplar 10th Ncert Science Zip and resin, removed in the falling leaves, or excreted fxemplar the surrounding soil.
Control and coordination are the functions of the nervous system and hormones in our bodies. The responses of the nervous system can be Zip Exemplar Science Ncert Class 10th classified as reflex action, voluntary action or involuntary action.
The nervous system uses electrical impulses to transmit messages. The nervous system gets information from our sense organs and acts through our muscles.
Chemical coordination is Exemplar Ncert 10th Science Zip Class seen in both plants and animals. Hormones produced in one part 10tj an organism move to another part to achieve the desired effect. A feedback mechanism regulates the action of the hormones. A stream of electrons moving through a conductor constitutes an electric current. Conventionally, the direction of current is taken opposite to the direction of flow of electrons.
The SI unit of electric current is ampere. To set the electrons Class 10th Ncert Exemplar Science Zip in motion in an electric circuit, we use scirnce cell or class 10th ncert exemplar science zip battery. A Class 10th Ncert Exemplar Science Zip cell generates a potential difference across its terminals. It is measured in volts V.
Resistance is Class 10th Ncert Exemplar Science Zip a property that resists the flow of electrons in a conductor. It controls the magnitude of the current. The 10th Exemplar Class Zip Ncert Science resistance of a conductor depends class 10th ncert exemplar science zip on its length, inversely on its Class Zip 10th Exemplar Science Ncert area of cross-section, and also on the material of the conductor.
The equivalent resistance sciebce several resistors in 10th Ncert Science Zip Class Exemplar series is equal to the sum of their individual resistances. One watt of power is consumed when 1 A of current flows at a potential difference of 1 V. The commercial unit scoence electrical energy Class 10th Ncert Exemplar Science Zip is kilowatt hour kWh. A compass needle is a small magnet. Its one end, which points towards north, is called a north pole, and the other end, which points towards south, is called a south pole.
A magnetic field exists in the region surrounding a magnet, in which the force of the magnet 10th Science Exemplar Zip Class Ncert Class 10th Ncert Exemplar Science Zip Class 10th Ncert Exemplar Science Zip can be detected. Field lines are used to represent a magnetic field. A field line is class 10th ncert exemplar science zip path along which a hypothetical free north pole would tend to.
The direction of Class 10th Ncert Exemplar Science Zip the magnetic field at a point is given by the direction that a north pole placed at that point would. Field lines are shown closer together where the magnetic field is greater. A metallic wire Class 10th Ncert Exemplar Science Zip carrying an electric current has associated with it a magnetic field. The field lines about the wire consist Class 10th Ncert Exemplar Science Zip of a series of concentric circles whose direction is given by the right-hand rule.
The pattern of the magnetic field around a conductor due to an electric current flowing through it depends on the shape Class 10th Ncert Exemplar Science Zip of the conductor. The magnetic field of a solenoid carrying a current is similar to that of a Class 10th Ncert Exemplar Science Zip bar magnet. An electromagnet consists of a core of soft iron wrapped around with a coil of insulated Exemplar Science 10th Zip Ncert Class copper wire.
A current-carrying conductor when placed in a magnetic field experiences a force. This is the basis of an electric class 10th ncert exemplar science zip. An electric motor is a device that converts electric energy into mechanical energy. The phenomenon of electromagnetic induction is the production of induced current in Exemplar Science 10th Ncert Class Zip a coil placed in class 10th ncert exemplar science zip region where the magnetic field changes with time.Class 10th Ncert Exemplar Science Zip
The magnetic field may change due to a relative motion between the coil and a magnet placed Class 10th Ncert Exemplar Science Zip near to the coil. If the coil is placed near to a current-carrying conductor, the magnetic field may Class 10th Ncert Exemplar Science Zip change either due to a change in the current through the conductor or due to the relative motion between the coil and conductor.
A generator converts mechanical energy into electrical energy. It works on the basis of electromagnetic induction. In our houses we receive AC electric power of V with a zi of 50 Hz.
One of the wires in this supply is with red insulation, called live wire. The other one is of black insulation, which is a neutral wire. The potential difference between the two is V. The third is the earth wire that has green insulation and this is connected to a metallic Class 10th Ncert Exemplar Science Zip body deep inside earth.
It is used as a safety measure to ensure that any leakage of current to a metallic body does not give any severe shock to a user.
Fuse is the most important Class 10th Ncert Exemplar Science Zip safety device, used for flass the circuits due to short-circuiting or overloading of the circuits. Acid-base indicators are dyes or mixtures of dyes which are used to indicate the presence of acids and bases. Formation of OH� aq ions in solution is responsible for the basic nature of a substance.
When an acid Class 10th Science Ncert Zip Exemplar reacts with a metal, hydrogen gas is evolved and a corresponding salt is formed. When a base reacts Class 10th Ncert Exemplar Science Zip Class 10th Ncert Exemplar Science Zip with a metal, along with the evolution of hydrogen gas a salt is formed which has a negative ion composed of the metal and oxygen. When an acid reacts with a metal carbonate or metal hydrogencarbonate, it gives the corresponding salt, carbon dioxide gas and water.
Acidic and basic solutions in water conduct electricity exemplsr they produce hydrogen and hydroxide ions respectively. Class 10th ncert exemplar science zip strength of an Class 10th Ncert Exemplar Science Zip acid or an alkali can be tested by using a scale called the pH scale which gives the measure of hydrogen ion concentration in a solution.
A neutral solution has a pH class 10th ncert Class 10th Ncert Exemplar Science Zip exemplar science zip exactly 7, while an acidic solution has a pH less than 7 and a basic Class 10th Ncert Exemplar Science Zip Class 10th Ncert Exemplar Science Zip solution a pH more than 7. Living beings carry out their metabolic activities within an optimal pH range.
Mixing concentrated acids or bases with water is a highly exothermic process. Acids and bases neutralise each other to form corresponding salts and water. Water of crystallisation scinece the fixed number of water molecules chemically Class 10th Ncert Exemplar Science Zip attached to each formula unit of a salt in its crystalline form.
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