Answer When an iron nail is placed in a copper sulphate solution, iron displaces copper from copper sulphate solution forming iron sulphate, which is green in colour. Kharif season includes the rainy season, which is not favourable for the growth of wheat crop. The paper is divided into two sections A and B and you need to answer the questions from one section at one place. Hence, it is a precipitation reaction. . Answer 2: A substance is said to be in the gaseous state if under normal pressure, its boiling point is below the room temperature. This method is important in areas where water availability is poor.
Go for or or or in English or go for Solutions. Describe in your own words. When water is allowed to flow under high pressure with the help of a pump, it gets sprinkled on the crops. Its chemical formula is CaO. All the solutions have been explained in the most appropriate and simple way to bring 100% concept clarity for all students.
For example, iron, in the presence of moisture, reacts with oxygen to form hydrated iron oxide. Ohm's law; Resistance, Resistivity, Factors on which the resistance of a conductor depends. The presence of villi gives the inner walls of the small intestine a very large surface area. Since energy is released in the whole process, it is an exothermic process. Go for or or or or go for Solutions.
The chemical equation needs to be balanced so that it obeys the Law Of Conservation of Mass. Chemical Reactions and Equations 2. Thus, bags used in packing food items are flushed with nitrogen gas to remove oxygen inside the pack. The topics and sub-topics in Chapter 1 Chemical Reactions and Equations are given below. Methods to control weeds are: Tilling before sowing of crops, physical removal of weeds by uprooting or cutting them close to the ground, using certain chemicals called weedicides etc. Its chemical formula is CaO.
They ensure healthy growth and development of plants by providing them with nitrogen, phosphorus, potassium, etc. The law of conservation of mass states that mass can neither be created nor destroyed. We also have a page where you can download lots of files. Which of the following gases can be used for storage of fresh sample of an oil for a long time? Answer 4: Substance undergo change in physical state because both inter-particle spaces and inter-particle forces can be changed by changing the condition of temperature and pressure. Explain the following in terms of gain or loss of oxygen with two examples each.
It is not difficult to score full marks in a science exam if you know exactly how much to write. For example, the taste and smell of butter changes when kept for long. Soln: a Thermal decomposition reaction Thermolysis Decomposition of potassium chlorate: When heated strongly, potassium chlorate decomposes into potassium chloride and oxygen. Look at the table and answer the following questions. Since the energy is in the form of heat that maintains our body temperature the respiration is considered to be an exothermic reaction.
They not only help you in getting a good school and stream of your choice in immediate future, but it will also help you in all sorts of competitive exams. Farmers use many ways to remove weeds. Answer If wheat is sown in the kharif season from June to October , then the whole crop might get destroyed because of many factors such as lack of optimum temperature, adaptability, availability of pests, etc. Unfortunately, interest and hard work alone are not enough. Go back to main page or move to of page. Write a paragraph in your own words on each of the following.
Answer When an iron nail dipped in the copper sulphate solution than iron displaces copper from the copper sulphate because iron is more reactive than copper. Soln: The main purpose of flushing Nitrogen into food packets that contain oil and fat items is to prevent Rancidity which occurs when the oil or fat reacts with the oxygen letting out an unpleasant smell and taste. Sowing is done manually are mechanical equipment like Seed Drill. Sublimation of camphor crystals a 1 and 2 b 2 and 3 c 1 and 4 d 3 and 4 Answer. Hence, it is a double displacement reaction.
This implies that Kerala has more well nourished people than Madhya Pradesh. Give an example of a double displacement reaction other than the one given in Activity 1. Identify the substances that are oxidised and the substances that are reduced in the following reactions. When stored, it reacts with oxygen to form a layer of magnesium oxide on its surface. Why should chemical equations be balanced? While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate? The particles or molecules of a gas come closer and closer as the pressure is being increased gradually. Find notes, question papers for various other subjects like Mathematics, Biology, Chemistry and many competitive exams as well. Electric power, Interrelation between P, V, I and R.
Question 1: Why should a magnesium ribbon be cleaned before burning in air? Sol: Minerals, water and gases like carbon dioxide and oxygen are the outside raw materials used by an organism. It involves regular uprooting or cutting of weeds close to the ground. One of the most important events in the universe is a chemical reaction. Exploiting resources unethically will ultimately undo the development that a country may have achieved. Answer 1: Question 2: How will an organism be benefited if it reproduces through spores? Why is respiration considered an exothermic reaction? What does one mean by exothermic and endothermic reactions? We obtain this energy from the food we eat. A chemical equation is balanced so that the numbers of atoms of each type involved in a chemical reaction are the same on the reactant and product sides of the equation. You will find plenty of them here or on the respective chapter page.