CLASS 10 SCIENCE – QUESTION PAPER Chapter 1: Chemical Reactions and Equations Maximum Marks: 80Time: 3 Hours General Instructions All questions are compulsory. The question paper is divided into 5 sections – A, B, C, D and E. Section A contains 20 questions of 1 mark each. Section B contains 6 questions of 2 marks...
Category: CBSE
CLASS 10 SCIENCE – QUESTION PAPER Chapter 1: Chemical Reactions and Equations Maximum Marks: 80Time: 3 Hours General Instructions All questions are compulsory. The question paper is divided into 5 sections – A, B, C, D and E. Section A contains 20 questions of 1 mark each. Section B contains 6 questions of 2 marks...
Chapter 1 Science Lecture 1
1. Chemical Reaction A chemical reaction is a process in which one or more substances change into new substances with different properties. Example: 2Mg + O2 → 2MgO Here, magnesium reacts with oxygen to form magnesium oxide. 2. Signs of a Chemical Reaction A chemical reaction may be identified by: Change in state Change in...