Exercise 4.1 Question Number 1
Eleanora Parrot
This one stumped me for a while, and I eventually just looked at the solution online. The hint was fairly cryptic, and manipulating "De Morgan's Laws" in JS with &&, !, is pretty complicating still. I'm starting to grasp it, but not quite there yet. I imagine I will need a fair bit of practice and time to understand these concepts thoroughly. Anyway, here is the question for one of the exercises at the end of chapter 5:
Analogous to the some method, arrays also have an every method. This one returns true when the given function returns true for every element in the array. In a way, some is a version of the operator that acts on arrays, and every is like the && operator.
I am currently solving this task. According to the condition for option 1, the Array.every() method could not be used. You need to make a custom function that will work as an Array.every().Here are my solutions:I will be very grateful for your advice and guidance on mistakes.
Chapter 1 of NCERT Solutions for Class 10 Science mainly deals with writing chemical equations and writing and balancing chemical equations. Also, in this chapter, students learn the basics of chemical reactions, their types and the effects of a chemical oxidation reaction in our daily lives. The NCERT Solutions Class 10 Science Chapter 1 provides an overview of the main concepts in the chapter and help them to get well-versed in important topics such as writing chemical equations and balancing them.
The NCERT Solutions for Class 10 Science Chapter 1 have good weightage, and there will be around 4 questions asked from this chapter every year. The types of questions that appear in this chapter are mostly practice-based questions. Thorough knowledge and good practice will help learners score full marks on the questions asked in this chapter.
Magnesium ribbon should be cleaned before burning in air because Magnesium metal reacts with the atmospheric oxygen and forms Magnesium Oxide (MgO) layer which is a very stable compound. In order to prevent further reactions with Oxygen, it is therefore necessary to clean the ribbon by to remove the layer of MgO.
In activity 1.7, gas collected in one of the test tubes is double of the amount collected in the other because water gets hydrolysed to release H2 and O2 gas. Here, after electrolysis two molecules of Hydrogen and one molecule of oxygen gas are released; hence, the amount of Hydrogen collected would be double than that of oxygen.
When an iron nail is dipped in the copper sulphate solution, iron displaces copper from the copper sulphate because iron is more reactive than copper. Therefore, the colour of the copper sulphate solution changes. The reaction is
Reaction Between silver nitrate (AgNO3) and Sodium chloride (NaCl) is an example of a double displacement reaction. During the reaction, negative and positive ions trade positions as a result of the formation of white silver chloride precipitate. The chemical reaction is given below.
Explanation: The Oxygen from the Ferrous oxide is getting displaced to the Aluminium metal to form Aluminium Oxide. In this reaction, Aluminum is a more reactive metal than Fe. Therefore, Al will displace Fe from its oxide. This type of chemical reaction, called displacement reaction, is in which one of the elements displaces another. Here, less reactive metal is displaced by more reactive metal. Since one-time displacement is occurring, it is called a single displacement reaction.
A balanced equation is the one in which number of different atoms on both the reactant and product sides are equal. Balancing chemical equations is necessary for the reaction should obey The Law of Conservation of mass. Balancing the chemical equation has no defined method and is purely a trial-and-error attempt.
An endothermic reaction occurs when energy is absorbed from the surroundings in the form of heat (For example, Photosynthesis, melting of ice, evaporation). Conversely, an exothermic reaction is one in which energy is released from the system into the surroundings (Examples: Explosions, concrete setting, nuclear fission and fusion).
For the survival of life, we require energy. We obtain this energy from the food we eat. The food molecules, through the process of digestion, is broken down into simpler molecule like glucose. These substances come in contact with the Oxygen present in our body cells to form Carbon dioxide and water along with a certain amount of energy (Respiration process). Since the energy is in the form of heat (that maintains our body temperature), respiration is considered to be an exothermic reaction. The reaction taking place is:
Combination reaction is said to be the reaction between two or more molecules to form a larger molecule; whereas the decomposition reaction is defined as the splitting of larger molecules into two or more smaller molecules. This essentially explains that the decomposition reaction is the opposite of the combination reaction.
In most cases, the decomposition reaction is endothermic since the heat from the surrounding or induced heat is used to break the bonds of the larger molecule. A few examples of decomposition reactions are
A displacement reaction is one when a more reactive substance displaces a less reactive one from its salt solution, whereas a double displacement reaction is one where a mutual exchange of ions happens between two compounds.
When two solutions containing soluble salts are combined, a double displacement reaction takes place in which the ions are exchanged between the compounds. When one of such compounds formed is in solid form (that is insoluble in aqua), then it settles down at the bottom of the container. This solid is known as the precipitate and the respective reaction is termed as the precipitation reaction. A few examples of precipitation reactions are
Iron articles are painted to prevent them from rusting. When left unpainted, the metal surface comes in contact with the atmospheric oxygen and in the presence of moisture it from Iron(III) oxide. But if painted, the surface does not come in contact with moisture and air, thus prevents Rusting.
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. Therefore, by flushing Nitrogen, an unreactive surrounding is created, thus preventing rancidity.
(a) Corrosion is a process where a refined metal is oxidised by atmospheric oxygen to form a more stable compound, such as oxides. The metal gradually degrades during the corrosion process. Rusting of iron is a good example of corrosion where the iron is converted to Iron oxide. Millions of dollars are spent annually in preventing rusting from bridges and other monuments.
(b) The condition produced by the aerial oxidation of the oil and fat present in the food material that produces an unpleasant taste and smell. The rancidity is retarded when the food is kept inside the refrigerator since the low temperature does not promote the oxidation reaction.
Chemical Reactions and equations is a very fundamental chapter that deals with basic knowledge of chemical reactions and equations. Students are advised to get tuned in with this chapter to avoid any sort of difficulty in understanding advanced topics of chemistry. If you are planning to take science in your higher secondary school, this is one of the important chapters you have to memorise for a very long period of time.
A chemical reaction is an important phenomenon in our lives. We come across various chemical reactions like rusting of iron, curdling of milk, respiration, digestion and growth. In order to score good marks in the CBSE Class 10 examination, students must practise the NCERT Solution for Class 10 Science Chapter 1 provided here.
Before you continue, we thought you might like to download our three Self-Compassion Exercises for free. These detailed, science-based exercises will not only help you increase the compassion and kindness you show yourself but will also give you the tools to help your clients, students, or employees show more compassion to themselves.
Introspection can be practiced both as an informal reflection process and a formal experimental approach, and the two have different definitions. Still, both processes can be undertaken by anyone with curiosity and determination (Cherry, 2016).
Enhancing our ability to understand ourselves and our motivations and to learn more about our own values helps us take the power away from the distractions of our modern, fast-paced lives and instead refocus on fulfillment (Wood, 2013).
When your focus on introspection has morphed from a dedication to an obsession, you have taken it too far. In fact, those who take self-reflection too far can end up feeling more stressed, depressed, and anxious than ever (Eurich, 2017).
In addition, it is all too easy for us to fool ourselves into thinking we have found some deep insight that may or may not be accurate. We are surprisingly good at coming up with rational explanations for the irrational behaviors we engage in (Dahl, 2017).
There are nearly endless questions, prompts, and ideas you can use to take a self-reflection break. Some of these can be asked, answered, and addressed every day, while others may best be saved for occasional self-reflection.
Not only does this burn a lot of your energy, but it also can have an unintended effect on the person who has upset you. When you place a clear emphasis or focus on what is wrong when speaking with someone, it implies that you are dissatisfied and unhappy.
Keep your focus on the big picture when you bring up issues, or you risk turning a small issue into a much broader problem (Bates, 2012).
Download 3 Free Self-Compassion Exercises (PDF)These detailed, science-based exercises will equip you to help others create a kinder and more nurturing relationship with themselves.
Sometimes when we work very hard to do good things, we get to a level of comfort with that fact, and we begin to talk about it to others. That can be a great thing in that it allows us to own our efforts and our actions and, with that, acknowledge our goodness to ourselves.
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