Exam (elaborations) PHYSICAL SCIENCES PAPER 2 (CHEMISTRY) GRADE 12

Anything which has mass and occupies space is called matter. It is made up of particles. In the above question, chair, air, almonds, and lemon water are matters. And love, smell, hate, thought, cold and smell of perfume are not in the category of matters because they are feeling and emotion of human beings and do not acquires any space. Q 2. Give reasons for the following observation: The smell of hot sizzling food reaches you several meters away, but to get the smell from cold food you have to go close. The smell of hot sizzling food reaches you several meters away Answer: The smell of hot sizzling food reaches us from several metres away, as the particles of hot have more kinetic energy than the cold food. So, the rate of diffusion is more in hot food as compare to cold food. Aakash Institute Q 3. A diver is able to cut through water in a swimming pool. Which property of matter does this observation show? Answer: A diver is able to cut through water in a swimming pool. It shows that the particles of matter (Water) have space between them and have less inter molecular forces of attraction. Q 4. What are the characteristics of the particles of matter? Answer: There are three characteristics of the particles of matter - 1. The particle of matter has space between them. 2. Particles of matter are continuously moving. 3. The particle of matter attracts each other. CBSE NCERT solutions for class 9 science chapter 1 Matter in Our Surroundings Topic 1.3 State of Matter Q1. The mass per unit volume of a substance is called density. (density = mass/volume). Arrange the following in order of increasing density – air, exhaust from chimneys, honey, water, chalk, cotton, and iron Answer: Aakash Insti