What is meant by saying that a potential difference between two points is 1 V? Extra secretion of oil from the skin resulting in the appearance of pimples. The lungs get filled up with air during the process of inhalation as ribs are lifted up and diaphragm is flattened. Storing food in air tight containers 2. Therefore, food items like potato chips etc. What do you mean by a precipitation reaction? However, if ethyne is burnt with oxygen, it gives a clean flame with temperature 30000C because of complete combustion. Glucose combines with oxygen in the cells and provides energy.
Question 3 What are the changes seen in girls at the time of puberty? Write one equation each for decomposition reactions where energy is supplied in the form of heat, light or electricity. Which of the following terms does not represent electrical power in a circuit? After you have studied lesson, you must be looking for answers of its questions. Hence, it is a precipitation reaction. Ans : 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. In a given voltmeter, a student sees that the needle indicates 12 divisions in voltmeter while performing an experiment to verify Ohm s law. In this chapter, we will learn that Matter is made up of small particles.
In Belgium, the Dutch-speaking majority people tried to impose their domination on the minority French-speaking community. Since social conflict often leads to violence and political instability, power sharing is a good way to ensure the stability of political order. In a truly democratic setup, the citizens too have a stake in governance. Thus, the circulatory system of humans is more efficient because of the double circulatory heart. Why are decomposition reactions called the opposite of combination reactions? It covers answers to all the in between exercises and exercises are given at the end of the chapter. Reactions that absorb energy or require energy in order to proceed are called endothermic reactions.
Hair growth in the areas like hands, legs, underarms, and face. Aerobic respiration Anaerobic respiration 1. Why are decomposition reactions called the opposite of combination reactions? Or Give two advantages of connecting electrical devices in parallel with battery. Magnesium is a very reactive metal. Answer — In a displacement reaction, a more reactive element displaces a less reactive element from its salt solution. Power sharing is good for democracy.
This pressure moves the material in the phloem to the tissues which have less pressure. The magnesium ribbon is cleaned by sand paper for removing this layer so that the underlying metal can be exposed to air. This solution contains questions, answers, images, explanations of the complete Chapter 4 titled The Fun They Had of Maths taught in class 9. Answer — The composition of water, i. When a 12 V battery is connected across an unknown resistance, there is a current of 2.
Redraw the circuit of question 12, putting an ammeter to measure the current through the resistor and a voltmeter to measure the potential difference across 12 Ω resistor. In India, the citizens can come together to debate and criticise the policies and decisions of the government. Represent the situation algebraically and geometrically. Ans : 'X' is copper Cu and the black-coloured compound formed is copper oxide CuO. The division of government into the executive, the legislature and the judiciary is an example of horizontal division of power. In the refining of silver, the recovery of silver from silver nitrate solution involved displacement by copper metal.
What is a balanced chemical equation? For example, the taste and smell of butter changes when kept for long. Answer: Practical Skills Based Questions Two Marks Questions Question 1. The cost of 2 kg of apples and 1 kg of grapes on a day was found to be Rs 160. Various defects of vision are also discussed here. Answer: The exchange of gases takes place between the blood of the capillaries that surround the alveoli and the gases present in the alveoli. Why is respiration considered an exothermic reaction? Due to more heat, heating element glows.
After a month, the cost of 4 kg of apples and 2 kg of grapes is Rs 300. The learner can master the art of balancing chemical equations by following and practicing the fully solved step by step explanations that serve as a guide. Name the following circuit components used. For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide. Explain the following in terms of gain or loss of oxygen with two examples each. Answer: Water H 2O contains two parts hydrogen and one part oxygen.
The small intestine gets the secretions in the form of bile juice and pancreatic juice respectively from the liver and the pancreas. Ans : Detergents are ammonium or sulphonate salts of long chain carboxylic acids. 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. The outer tissue surrounding the embryo develops into finger like projections known as Villi. Which of the statements about the reaction below are incorrect? Ans : Cleansing action of soaps: The dirt present on clothes is organic in nature and insoluble in water.
It occurs in the presence of O 2. Dimensionally t can be represented by 5 min a b c d None of these Solution. Also, three years from now, I shall be three times as old as you will be. Hence, it is a precipitation reaction. Video Solution Answer: Energy is required to support life.