1. A form of matter with a definite compositions and distinct properties?
2. The smallest particle of the element that can take part in a chemical reaction.
3. What is the chemical formula of potassium permanganate?
4. What is the physical state of potassium permanganate at room temperature and
pressure?
5. What is the SI unit of the density of a substance?
6. What is the freezing point of pure water on the Celsius scale?
7. what condition of the temperature and pressure favour the liquefaction of the gases?
8. list the various kind of the motion gas molecules are capable of exhibiting?
9. why does a balloon that is kept in sunlight burns after sometime?
10. What is the difference between matter and material?
11. Wash clothes dry faster on a windy day than on a calm day. why?
12. What is the difference between amorphous and crystalline solids?
13. Define the latent heat of fusion.specified this value for water .
14. Explain why the Kelvin scale has a lower limit of temperature.
15. write the symbol of the chemical entity which contains 18-electrons, 19 protons and 20
neutrons. what will be the combined weight of 10 ²⁵ such entities?
16. Give one example of monovalent monoatomic cations?
17. What is the valency of oxide ions and sulphide ions?
18. write the chemical formula of the sulphide ore Cinnabar?
19. What is the Latin name for the silver elements and its modern symbol?
20. What symbol did Dalton use for the silver atom?
21. What type of bonds are present in ammonia? write its chemical formula.
22. Give an example of polar violence monoatomic anion.?
23. What is the atomicity of the fluorine in its molecules?
24. Write the chemical formula of silicon dioxide.
25. Write the chemical formula of carbon disulphid.
26. The chemical formula of ammonium sulphate is……..
27. The atomic weight of calcium is……
28. The chemical symbol for bromine .
29. The symbol of iron.
30. Which law of chemical combination is referred to as a' law of indestructbility of matter.
31. Which elements has atomic number equal to its valency?
32. Name any elements was atomic number and valency are both prime number.
33. which element has the electronic configuration 2, 8 ,6
34. Name the element having 3 protons and 4 neutrons.
35. What will be the valency of the element whose atom has three protons and neutrons?
36. What will be the mass number of the elements whose atoms has 3 protons and 4
neutrons?
37. Write electronic configuration of the two ants found in a common salt.
38. Write the SI unit of displacement.
39. What is the SI unit of speed.
40. What is the total part land covered called?
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Answers
Answer:
1.A pure substance (usually referred to simply as a substance) is matter that has a fixed composition and distinct properties.
2.Atom
3.KMnO₄
4.solid
6. 0 °C
7.The minimum pressure required to liquefy the gas at the critical temperature is called the critical pressure. For example, the critical temperature for carbon dioxide is 88°F (31°C). That means that no amount of pressure applied to a sample of carbon dioxide gas at or above 88°F will cause the gas to liquefy.
8.They can show all the three types of molecular motion, vibrational, rotational and translational motion.
9.When the balloon is kept in the sun, due to Sun's heat, the kinetic energy of gaseous particles inside the balloons also gets increased and the balloon expands. This will increase the pressure on the walls of the balloon. It continues to expand and comes to a stage when the balloon bursts.
10.Matter: The stuff from which everything is made. Material: Any type of matter.
11.Evaporation increases with increase in wind speed. With the increase in wind speed, the particles of water vapour move away with the wind, decreasing the amount of water vapour in the surrounding. Hence, clothes dry faster on a windy day.
12.Crystalline solids have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points. In contrast, amorphous solids have irregular or curved surfaces, do not give well-resolved x-ray diffraction patterns, and melt over a wide range of temperatures.
13.The latent heat of water at 0 degree Celsius for fusion is nearest to 334 joules per gram or 79.7 calories per gram. On the other hand, the latent heat of water at 100°C for vaporization is approximately 2230 joules per gram or 533 calories per gram. ... The latent heat of ice in calories per gram is 80.
14.There are no negative numbers on the Kelvin scale, as the lowest number is 0 K. The idea for the Kelvin scale was sparked by a discovery in the 1800s of a relationship between the volume and the temperature of a gas. Scientists theorized that the volume of a gas should become zero at a temperature of minus 273.15 C.
15.The symbol for the ion with 19 protons and 18 electrons is K+.
16.calcium carbonate consists of the monatomic ion Ca2+
17.The valency of sulphide and oxide ion is−2.
18.HgS
19.Silver – Argentum (Ag)
The Latin name for silver, 'argentum', is thought to derive originally from an Indo-European language, likely referring to the metal's shininess.
20. S
21.1n ammonia molecule( NH3 ), three hydrogen atoms form covalent bonds with nitrogen atom.
23.Atomicity is the number of atoms present in one molecule of that element. Fluorine has 2 atoms in its molecule. So atomicity of F is 2 and not 6.
24.SiO2
25.CS2
26.(NH₄)₂SO₄
27.40.078 u
28. Br
29.Fe
30.The law of conservation of mass is also known as the "law of indestructibility of matter."
33.Sulphur
34. an atom contains 3 protons and 4 neutrons then atom will be of Lithium element.
35.If an atom contains 3 protons and 4 neutrons then atom will be of Lithium element. The outermost orbit of Lithium has 1 Electron so it's valency could be +1 or -1.
36. 7
38.meter
39.metre per second
40."Land area" (also known as "land mass") refers to the total surface area of the land of a geographical region or country (which may include discontinuous sections of land such as islands).
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