Text Questions 1. Why should a magnesium ribbon be cleaned before burning in air? Ans: Magnesium is a very reactive metal when stored, it reacts with oxygen to form a layer magnesium oxide on its surface. This layer of magnesium oxide is quite stable and prevents further reaction of magnesium with oxygen. The magnesium ribbon is […]
Chemical Equation And Reactions, Class-10 (Chemistry) Read More »
Page no. 43 Q 1:What are canal rays? Answer :Canal rays are positively charged radiations. These rays consist of positively charged particles known as protons. They were discovered by Gold stein in 1886. Q 2:If an atom contains one electron and one proton, will it carry any charge or not? Answer: An electron is a
Chapter 4(structure of the atom) Read More »
Q1: In a reaction 5.3 g of sodium carbonate reacted with 6 g of ethanoic acid. The products were 2.2 g of carbon dioxide, 0.9g water and 8.2 g of sodium ethanoate. Show that these observations are in agreement with the law of conservation of mass.Sodium carbonate + ethanoic acid → sodium ethanoate + carbon dioxide +
Chapter:3 (Atom And Molecules),Class 9 Chemistry Read More »
Q1: What is meant by a pure substance? Answer: A pure substance is the one that consists of a single type of particles, i.e., all constituent particles of the substance have the same chemical nature. Pure substances can be classified as elements or compounds. Q2: List the points of differences between homogeneous and heterogeneous mixtures.
Chapter:2(Is Matter Around Us Pure),Chemistry ,Class 9 Read More »
Q 1: Which of the following are matter? Chair, air, love, smell, hate, almonds, thought, cold, cold drink, smell of perfume. Answer Anything that occupies space and has mass is called matter. Matter can exist in three physical states—solid, liquid, and gaseous. Chair and almond are forms of matter in the solid state. Cold drink is
Chapter:1(Matter in our Surrounding),Chemistry Class 9 Read More »
