Storing food in air tight containers 2. Hence, current flowing through the 2 Ω resistor is. Which of the following is are an endothermic process es? Sowing is done manually are mechanical equipment like Seed Drill. Which of the following are combination reactions? These undesirable plants are called weeds. What is the difference between displacement and double displacement reactions? Electrolysis of water is a decomposition reaction.
Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity. Why should a magnesium ribbon be cleaned before it is burnt in air? Question 7: Write the balanced chemical equations for the following reactions. Hence, the sum of the resistances will give the value of R. What happens when dilute hydrochloric acid is added to iron filings? Answer 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. Another example of precipitation reaction is: In this reaction, barium sulphate is obtained as a precipitate. You are not going to miss out any problems because the solutions include the latest editions of text-book that are used in 2018 to 2019 session.
Answer: The ability of a diver to cut through water in a swimming pool shows that matter is made up of particles. But if painted the surface does not come in contact with moisture and air thus preventing Rusting. It becomes very important to score well in science in class 10th for multiple reasons. The magnesium ribbon is cleaned by sand paper to remove this layer so that the underlying metal can be exposed into air. Question 3: Write a balanced chemical equation with state symbols for the following reactions. In this chapter, we will learn that Matter is made up of small particles. These spaces are larger as compared to the spaces present between the particles of water.
An electric motor takes 5 A from a 220 V line. The equation of the reaction involved on heating copper is given below. The resistance of the element of an electric heater is very high. Seeds of few plants like rice is first grown in a separate area and then transplanted in the fields. Write a paragraph in your own words on each of the following. Let R be the equivalent resistance of the circuit. Question 2: Why is the amount of gas collected in one of the test tubes in Activity 1.
Its chemical formula is CaO. Q20 Explain the following terms with one example each. The best time for the removal of weeds is before they produce flowers and seeds. The reaction is as follows: Question 4: What is a balanced chemical equation? Therefore, the amount of hydrogen and oxygen produced during electrolysis of water is in a 2:1 ratio. Therefore, ice floats on water.
Answer: i The nutritional levels of people in Kerala and Madhya Pradesh are different. Calculate the number of electrons constituting one coulomb of charge. When one of such compound formed is in solid form that is insoluble in aqua then it settles down at the bottom of the container. Which of the following is not a physical change? It produces large amount of heat. Answer: Environmental degradation manifests itself in different ways. This evaporation makes the water inside the pot cool. During evaporation, particles of the liquid absorb energy from the surrounding or the surface of the palm to compensate for the loss of energy, making the surroundings cool.
Q2 Write a balanced equations for the following chemical reactions. Answer a Thermal decomposition: Question 13: What is the difference between displacement and double displacement reactions? If still have any query you can put your remarks and our experts will get back to you with the solution. Video Solution Answer: If we connect the resistors in series, then the equivalent resistance will be the sum of the resistors, i. Q10 Why is respiration considered to be an exothermic reaction? Visit to main page or move to of the page. Answer: a The differences in the characteristics of states of matter are given in the following table. Hence, it is for this reason that chemical equations should be balanced.
This implies that iron is a better conductor than mercury. Glucose combines with oxygen in the cells and provides energy. Answer In a displacement reaction, a more reactive element replaces a less reactive element from a compound. Note:- I have solved this question for the sake of clarity. Q19 Oil and Fat containing food items are flushed with Nitrogen.
During digestion, large molecules of food are broken down into simpler substances such as glucose. For other answers visit to or and in English or go for Solutions. We could have solved the question directly using H R if in case the current was also same. In most of the cases the decomposition reaction is endothermic since heat from the surrounding or induced heat is used to break the bonds of the larger molecule. Answer a Hydrogen gas and iron chloride are produced. The law of conservation of mass states that mass can neither be created nor destroyed.
Hence, the rate at which energy is delivered by a current is the power of the appliance. Why should a chemical equation be balanced? Soln: When left unused, the outer layer of Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide MgO layer which is a very stable compound thus preventing further reactions with Oxygen. Which of the following is the correct explanation for the observation? Answer Oil and fat containing food items flushed with nitrogen because nitrogen acts as an antioxidant and it prevent them from being oxidised. The food molecules, through the process of digestion is broken down into simpler molecule like glucose. However, it would be wrong to say that per capita income is not a useful criterion at all. 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. State Male % Female % Kerala Karnataka Madhya Pradesh 22 36 43 19 38 42 All Sates 37 46 i Compare the nutritional level of people in Kerala and Madhya Pradesh.