Question

1. Give two important applications of radioactive isotopes.

2. Define a) valency b) Atomic number

3. What are the postulates of of Bohr’s model of an atom

4. Write the law of conservation of mass

5. Why are lysosomes known as suicide bags?

6. Where are proteins synthesized inside the cell?

7. A cell is called the structural and functional unit of life?

8. Write the characteristics of suspension and colloidal solution
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Answer 1

Answer:

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Explanation:

1. Radioactive isotope, also called radioisotope, radionuclide, or radioactive nuclide, any of several species of the same chemical element with different masses whose nuclei are unstable and dissipate excess energy by spontaneously emitting radiation in the form of alpha, beta, and gamma rays
2. a)Valency of an element is a measure of its combining power with other atoms when it forms chemical compounds or molecules. b). Atomic size is determined by the atomic radius. For an isolated atom, its atomic radius is the distance between the center of the atom (i.e. center of its nucleus) and its outermost shell.
3. Postulates of Bohr's Model of an AtomEach orbit or shell has a fixed energy and these circular orbits are known as orbital shells. The energy levels are represented by an integer (n=1, 2, 3…) known as the quantum number. ... shells and when an electron attains the lowest energy level, it is said to be in the ground state.
4. The Law of Conservation of Mass dates from Antoine Lavoisier's 1789 discovery that mass is neither created nor destroyed in chemical reactions. ... If we account for all reactants and products in a chemical reaction, the total mass will be the same at any point in time in any closed system.
5. Lysosomes are known as suicide bags of the cell because they contain lytic enzymes capable of digesting cells and unwanted materials.
6. RibosomesRibosomes are the sites in a cell in which protein synthesis takes place. Cells have many ribosomes, and the exact number depends on how active a particular cell is in synthesizing proteins.
7. The cell is called the structural and functional unit of life as all living organisms are made up of cells. Cells are also essential for performing various life processes required for sustaining life. Furthermore, cells provide form and structure, process nutrients and convert it into useable energy.
8. Properties of Suspension. A suspension is a heterogeneous mixture. The size of solute particles in a suspension is quite large. The particles of a suspension can be seen easily. The particles of a suspension do not pass through a filter paper. The suspension is unstable.