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A reaction which has an equal number of atoms of all the elements on both sides of the chemical equation is called a balanced chemical equation. The law of conservation of mass states that mass can neither be created nor destroyed. Hence, in a chemical reaction, the total mass of reactants should be equal to the total mass of the products.
It means that the total number of atoms of each element should be equal on both sides of a chemical equation. Hence, it is for this reason that chemical equations should be balanced. Why is respiration considered an exothermic reaction? Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose. Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration.
Since energy is released in the whole process, it is an exothermic process. Why are decomposition reactions called the opposite of combination reactions? Decomposition reactions are those in which a compound breaks down into two or more substances. These reactions require a source of energy to proceed. Thus, they are the exact opposite of combination reactions in which two or more substances combine to give a new substance with the release of energy.
Why do we apply paint on iron articles? Iron articles are painted because applying paints prevents them from rusting. When painted, the contact of iron articles from moisture and air is cut off. Hence, rusting is prevented their presence is essential for rusting to take place. Oil and fat containing food items are flushed with nitrogen. Nitrogen is an inert gas at room temperature and does not easily react with oil and fat containing items.
On the other hand, oxygen reacts with food substances and makes them rancid. Here, we will also learn about some solar devices and their advantages and disadvantages.
All the energy sources depend on various Ncert Solutions For Class 10th Science Chapter 13 File factors like the ease and cost of extracting energy from the source. Solar cells, solar cooker, windmills, etc. The various components of an ecosystem are interdependent. We know that the producers make the energy from sunlight available to the rest of the ecosystem. Food web or food chain is based on producers. The ozone layer is now affected due to excess use of CFCs. The generated waste may be biodegradable or non-biodegradable cause the problem of disposal.
In Chapter 16 of Class 10 Science , we will learn how to use our natural resources like forests, wildlife, water, coal and petroleum in a sustainable manner. We know that fossil fuels like coal and petroleum will ultimately be exhausted after a few years. In this chapter, we will learn how to utilise the renewable resources which may last for many years. Important derivations, numerical problems, practice test and assignments will also have uploaded time to time.
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There is no current division occurring in a series circuit. Chapter 2: Acids, Bases and Salts Class 10 Science Chapter 2 includes the concepts of Acid-base indicators or mixtures of these dyes which are used to indicate the presence of acids and bases. Chapter 3: Metals and Non-Metals In Chapter 3 of Class 10 Science, we will study that elements can be classified as metals and non-metals.
Chapter 4: Carbon and its Compounds Chapter 4 of Class 10 Science, covers deals with versatile properties of carbon, Catenation and Tetravalency. Chapter 5: Periodic Classification of Elements Class 10 Science Chapter 5 is based on how elements are classified on the basis of similarities in their properties.
Chapter 7: Control and Coordination Control and coordination, in Class 10 Science, have the functions of the nervous system and hormones in our bodies. Chapter 8: How do Organisms Reproduce?
Chapter 9: Heredity and Evolution Variations arising during the process of reproduction can be discussed in Chapter 9 Heredity and Evolutions of Class 10 Science. Chapter Human Eye and Colourful World After going through Chapter 11 of Class 10 Science, we will be able to know about the accommodation of the eye, the near point of the eye or the least distance of distinct vision.
Chapter Electricity We will deal here with the basic concepts of Electricity and its heating effects. Chapter Magnetic Effects of Electric Current Here we will learn about a compass needle which is a small magnet and its one end, which points towards north, is called a north pole, and the other end, which points towards the south, is called a south pole.
Chapter Sources of Energy As we know that our energy requirements increase with our standard of living nowadays. Chapter Management of Natural Resources In Chapter 16 of Class 10 Science , we will learn how to use our natural resources like forests, wildlife, water, coal and petroleum in a sustainable manner. Important Questions on 10th Science Why is respiration considered an exothermic reaction? Energy in our body is obtained from the food we eat. During digestion, large molecules of food are broken down into simpler substances such as glucose.
Glucose combines with oxygen in the cells and provides energy. The special name of this combustion reaction is respiration. Since energy is released in the whole process, it is an exothermic process. What are olfactory indicators? Give an example. Olfactory indicators are substances which have different odour in acid and base solutions.
For example, vanilla essence has characteristics pleasant smell in acid solution and no smell in alkali solution. Platinum, gold and silver are used to make jewellery. Platinum, gold, and silver are used to make jewellery because they are very lustrous.
Also, they are very less reactive and do not corrode easily. Why are carbon and its compounds used as fuels for most applications? Most of the carbon compounds give a lot of heat and light when burnt in air. Saturated hydrocarbons burn with a clean flame and no smoke is produced. The carbon compounds, used as a fuel, have high calorific values. Therefore, carbon and its compounds are used as fuels for most applications. How does the electronic configuration of an atom relate to its position in the Modern Periodic Table?
In the modern periodic table, atoms with similar electronic configurations are placed in the same column. In a group, the number of valence electrons remains the same. Elements across a period show an increase in the number of valence electrons.
What is the role of saliva in the digestion of food? Saliva is secreted by the salivary glands, located under the tongue. It makes the food soft for easy swallowing. It contains a digestive enzyme called salivary amylase, which breaks down starch into sugar.
What are the methods used by plants to get rid of excretory products? Plants use completely different strategies for excretion than those of animals. They can get rid of excess water by transpiration. For other wastes, plants use the fact that many of their tissues consist of dead cells, and that they can even lose some parts such as leaves.
Many plant waste products are stored in cellular vacuoles. Waste products may be stored in leaves that fall off. Other waste products are stored as resins and gums, especially in old xylem. Plants also excrete some waste substances into the soil around them. How does phototropism occur in plants? The movement of plant in response to light is called phototropism. Stem shows positive phototropism as follows: When growing plants detect light, a hormone called auxin, synthesised at the shoot tip, helps the cells to grow longer.
When light is coming from one side of the plant, auxin diffuses towards the shady side of the shoot. This concentration of auxin stimulates the cells to grow longer on the side of the shoot which is away from light. Thus, the plant appears to bend towards light. How does chemical coordination take place in animals? Chemical coordination takes place in animals with the help of hormones. Hormone is the chemical messenger that regulates the physiological processes in living organisms.
It is secreted by glands. The regulation of physiological processes and control and coordination by hormones comes under the endocrine system.
The nervous system along with the endocrine system in our body controls and coordinates the physiological processes. How does the process of budding is differ from the process of spore Ncert Solutions For Class 10th Science Chapter 7 Form formation? Budding: A bud, as in Hydra, develops as an outgrowth due to replicated cell division at a specific site.
These buds when mature detach from the parent body and become new individual. Spore Formation: In spore formation, as in Rhizopus, a specific part called Sporangia that produce spores. The spores are covered by thick walls that protect them until a spore gets favourable conditions to grow into a new Rhizopus plant.
Explain how sexual reproduction gives rise to more viable variations than asexual reproduction. How does this affect the evolution of those organisms that reproduce sexually?
In sexual reproduction, two individuals having different variations combine their DNA to give rise to a new individual. Therefore, sexual reproduction allows more variations, whereas in asexual reproduction, chance variations can only occur when the copying of DNA is not accurate. Additionally, asexual reproduction allows very less variations because if there are more variations, then the resultant DNA will not be able to survive inside the inherited cellular apparatus. However, in sexual reproduction, more variations are allowed and the resultant DNA is also able to survive, thus making the variations viable.
Variation and Evolution: Variants help the species to survive in all the conditions. Environmental conditions such as heat, light, pests, and food availability can change suddenly at only one place. At that time, only those variants resistant to these conditions would be able to survive.
This will slowly lead to the evolution of a better adapted species. Thus, variation helps in the evolution of sexually reproducing organisms. Will geographical isolation be a major factor in the speciation of an organism that reproduces asexually? Why or why not? Geographical isolation prevents gene flow between populations of a species whereas asexual reproduction generally involves only one individual.
In an asexually reproducing organism, variations can occur only when the copying of DNA is not accurate. Therefore, geographical isolation cannot prevent the formation of new species in an asexually reproducing organism. Name the mirror that can give an erect and enlarged image of an object. When an object is placed between the pole and the principal focus of a concave mirror, the image formed is virtual, erect, and enlarged. A battery of 9 V is connected in series with resistors of 0.
Why are coils of electric toasters and electric irons made of an alloy rather than a pure metal? The resistivity of an alloy is higher than the pure metal and it does not corrode easily. Moreover, even at high temperatures, the alloys do not melt readily. Hence, the coils of heating appliances such as electric toasters and electric irons are made of an alloy rather than a pure metal.
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