Here are some critical Chapter 1 Chemical Reactions and Equations problems for Class 10 Science. These inquiries are intended to aid students in studying for and performing well on the CBSE Class 10 Science Examination 2023–24. Students can clear up their concerns and be ready for the exams by practising different types of questions. By answering these questions, you'll increase your confidence while also sharpening your problem-solving abilities.
Chapter 1 of Class 10 Science, Chemical Reactions and Equations covers chemical equations, balanced chemical equations, implications of balanced chemical equations, and many types of chemical reactions. For instance, combination, decomposition, displacement, double displacement, precipitation, endothermic exothermic processes, oxidation, and reduction. The Consequences of Oxidation Reactions in Everyday Life, such as Rancidity and Corrosion.
Double displacement is a type of chemical reaction where two compounds react, and the positive ions (cation) and the negative ions (anion) of the two reactants switch places, forming two new compounds or products.
H2S+CuSO4 → CuS+H2SO4
Ans. (a) Two
Chemical reactions can be divided into 2 types on the basis of evolution or absorption of heat in a chemical reaction.
1) Exothermic Reactions - The chemical reactions in which energy is evolved either in the form of light or heat.
Example- CaCl2 (s) + 2(H2O) ---> Ca(OH)2 (aq) + 2 HCl (g) + heat.
2) Endothermic Reactions - The chemical reactions in which energy is absorbed either in the form of heat or light.
Example- 6CO2 (g) + 6 H2O (g) + heat ---> C6H12O6 + 6O2 (g).
It is advisable to show the physical state of the substance to make it more informative and to emphasise that those reactions occur in that manner only under those conditions. Hence, physical states of reactants and products are mentioned while writing a chemical equation.
When magnesium ribbon burns in air, it combines with the oxygen to form magnesium oxide.
2Mg(s) + O2(g) -> 2MgO(s)
Lime water is solution of Calcium Hydroxide almost as clear as water When Carbon dioxide gas is passed through it it turns milky because in this chemical reaction Calcium Carbonate is Formed which is insoluble in water So these insoluble particles are spread throughout the solution These particles being white in colour the solution appears to be milky.
When excess CO2 is added, it reacts with calcium carbonate( CaCO3) and water (H2O) to form calcium bicarbonate Ca(HCO3)2 and since it is soluble in water, it dissolves in it making the solution clear again.
Ca(OH)2(ag) + CO2 (g) -> CaCO3(s) + H2O(I)
CaCO3(s) + H2O(I) + CO2(g) -> Ca(HCO3)2(aq)
oswal.io offers a thorough set of questions for learning the topic in a better way if you're looking to further practise and improve your grasp of the concepts covered in the chapter.
Ans: A chemical reaction takes place when two or more molecules meet in the proper direction and with enough force to create a new product. Bonds between atoms are broken and formed during this process. Reactants are substances that interact to form new substances, whereas products are the newly created substances.
Ans: Combustion, decomposition, neutralisation, redox, precipitation or double-displacement, and synthesis are some of the numerous types of reactions that might occur depending on the product that is produced.
Ans: When molecules in a reactant undergo a chemical reaction, their bonds are broken, and molecules in the product undergo a similar process, new bonds are created, creating a new substance. The production of a chemical product from reactants is represented mathematically by a chemical equation.
Ans: The breakdown of chemical species into less complex components is known as a decomposition reaction.Example: When heated, calcium carbonate breaks down into calcium oxide and carbon dioxide.
CaCO3 (s) + Heat → CaO (s) + CO2 (g)
Ans: Two reactants exchange ions to generate two new compounds in a displacement reaction known as precipitation or a double displacement reaction.
Example: AB + CD → AD + CB