Exam, 8th Sci., Chap. 6 - Composition of Matter

Practice Question Paper: Chapter 6 - Composition of Matter

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Q.1. Fill in the blanks.

1. The intermolecular force of attraction in gases is extremely __________, allowing constituent particles to move freely and occupy all available space.  
2. A homogeneous mixture of two or more substances is known as a __________, where the components form a single phase.  
3. In a solution, the component that is present in the largest proportion is called the __________.  
4. Complex compounds like chlorophyll and hemoglobin contain __________ atoms at the center of their molecular structures.  
5. The combining capacity of an element expressed in terms of chemical bonds is called its __________.  

Q.2. Match the following.

Group 'A' (Type of Matter / Mixture).    Group 'B' (Characteristic / Description)

1. Suspension                      a) Heterogeneous mixture where particle size is around 

10^-5 m, and light is partly scattered.

2. Colloid.       b) Heterogeneous mixture of a liquid and solid where particles are larger than 10^-4  m and settle on filter paper.

3. Inorganic Compound.      c) Carbon compounds such as glucose, sugar, and urea.

4. Organic Compound.        d) Compounds such as common salt, baking soda, and blue vitriol.

Q.3. State whether true or false.

1. In a chemical compound, the proportion of constituent elements is always constant. 
2. The constituent substances in a mixture retain their individual chemical properties. 
3. Gases have high rigidity and a definite shape. 
4. Ordinary filter paper can easily separate solute particles from a true solution. 

Q.4. Write the answer in one sentence.

1. What is defined as a 'phase' in matter?
2. Define 'solute.'
3. What kind of residue is typically left behind when organic compounds like sugar or camphor are strongly heated?
4. What information is indicated by the subscript in a chemical formula?

Q.5. Write scientific reasons.

1. Gases possess neither a definite shape nor a definite volume.
2. Constituent particles of a true salt solution cannot be separated by ordinary filtration.
3. Metals like copper and iron are malleable, whereas a solid piece of coal is brittle.
4. Substances like petrol and cooking gas (hydrocarbons) are classified as organic compounds.