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FAQs on Past Year Paper, Chemistry (Set - 1), 2016, Class 11, Chemistry - Additional Study Material for NEET

1. How can I balance chemical equations in chemistry?
Ans. Balancing chemical equations involves ensuring that the number of atoms on both sides of the equation is equal. To balance an equation, one can start by adjusting the coefficients of the compounds until both sides have an equal number of atoms for each element. This can be done by using the principle of conservation of mass and applying mathematical techniques such as trial and error or algebraic methods.
2. What is the difference between an element and a compound in chemistry?
Ans. In chemistry, an element is a pure substance that consists of only one type of atom. Elements cannot be broken down into simpler substances by ordinary chemical means. On the other hand, a compound is a substance that consists of two or more different elements chemically combined in fixed proportions. Compounds can be broken down into simpler substances through chemical reactions.
3. What are the different types of chemical reactions?
Ans. There are several types of chemical reactions, including: 1. Combination reaction: Two or more substances combine to form a single product. 2. Decomposition reaction: A single compound breaks down into two or more simpler substances. 3. Displacement reaction: An element reacts with a compound, displacing another element from it. 4. Redox reaction: A reaction that involves both reduction (gain of electrons) and oxidation (loss of electrons) processes. 5. Acid-base reaction: A reaction between an acid and a base, resulting in the formation of a salt and water.
4. What is the concept of stoichiometry in chemistry?
Ans. Stoichiometry is a branch of chemistry that deals with the quantitative relationships between reactants and products in chemical reactions. It involves using balanced chemical equations to determine the relative amounts of substances involved in a reaction. Stoichiometric calculations can be used to determine the amount of reactants needed, the amount of products formed, and to predict the yield of a reaction.
5. How does temperature affect the rate of a chemical reaction?
Ans. Temperature plays a significant role in determining the rate of a chemical reaction. Increasing the temperature generally increases the rate of reaction. This is because at higher temperatures, the reactant particles have more kinetic energy, leading to more frequent and energetic collisions. The increase in collision frequency and energy increases the chances of successful collisions, resulting in a faster reaction rate. However, extreme temperatures can also denature enzymes or cause other changes in reaction conditions that may slow down or inhibit the reaction.
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