Chemistry Class 10: Chapter 1 Quiz

Mass number is the sum of protons and neutrons in the nucleus of an atom, while atomic mass is the average mass of all the isotopes of an element.

Atomic number is the number of protons in the nucleus of an atom. It determines the identity of an element and the chemical properties of the atom.

Some important topics covered in chapter 1 of Chemistry class 10 include the structure of an atom, atomic number, mass number, and isotopes.

<p>Key characteristics of a chemical reaction include the formation of new substances, change in color, evolution of gas, and release or absorption of energy. A chemical reaction can be identified by observing these changes.</p> Signup and view all the answers

<p>The law of conservation of mass states that mass can neither be created nor destroyed in a chemical reaction. This means that the total mass of the products of a chemical reaction must be equal to the total mass of the reactants.</p> Signup and view all the answers

<p>The different types of chemical reactions include combination (or synthesis), decomposition, displacement, and double displacement reactions. An example of each type could be the combination of iron and sulfur to form iron sulfide, decomposition of hydrogen peroxide into water and oxygen, displacement of zinc from zinc sulfate solution by iron, and double displacement reaction between silver nitrate and sodium chloride forming silver chloride and sodium nitrate.</p> Signup and view all the answers