B5C4105 Section B-Chemistry [40 Question 4 [20) 4.1 4.1.1 4.1.2 4.2 Briefly defi

Question

B5C4105 Section B-Chemistry [40 Question 4 [20) 4.1 4.1.1 4.1.2 4.2 Briefly define the following terms used in studying different kinds of matter: Composition Properties Matter can be classified into different states based upon particle arrangement, energy of particles and distance between particles. Classify the following properties as solid, liquid or gas. 4.2.1 A substance has a fixed volume and shape. 4.2.2 Atoms in a substance are able to slide over one another i.e. ability to flow. 4.2.3 A substance has low density and can be compressed i.e. atoms are far from each other Atoms in a substance are incompressible as they are tightly held together. A phase change is a transition of a substance from one state to another. Briefly define melting, boiling & condensation in terms of: Heat Energy An element is a substance that cannot be broken down into simpler substance by physical and chemical reaction. What does an element consists of? A compound is a substance that consists of two or more elements chemically bonded. Compounds can be decomposed or synthesised. Give the name of the following compound. Is the reaction a synthesis or decomposition reaction? 4.2.4 4.3 4.3.1 4.3.2 4.4 4.5 (2) Hydrochloric Acid undergoes a complete dissociation in water. Is hydrochloric acid a weak or strong acid? Give a complete dissociation reaction between Hydrochloric 4.6 10

Explanation / Answer

4.1)Matter is a substance that has inertia and occupies physical space. According to modern physics, matter consists of various types of particles, each with mass and size. Matter can exist in several states, also called phases. The three most common states are known as solid, liquid and gas.

4.1.1) A compound is a chemically pure substance composed of two or more elements in a constant composition and combination.

4.1.2) there are two types of properties chemical property and physical propery

1.Physical properties are properties that can be measured or observed without changing the chemical nature of the substance. Ex.volume, mass, melting point, boiling point

2. chemical property is that measuring that property must lead to a change in the substance’s chemical structure.

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