Matter Around Us Online Test 7th Science Lesson 3 Questions in English

1. Which among the following is the matter?

2. The graphite refill used in pencil is made up of element called _______

3. The smallest unit of an element that exhibits the properties of the element is called as ______

4. The most abundant type of atom in the universe is _______

5. When an atom combines with another atom (or atoms) and forms a compound it is called as _______

6. Ozone is a substance that is made up of how many oxygen atoms chemically combined?

7. Which among the following statement is correct?

8. Oxygen gas in the air that we breathe is made up of how many oxygen atoms chemically combined?

9. Which among the following is not the monatomic molecule?

10. Which among the following molecule is not diatomic molecule?

11. Which among the following is not polyatomic molecule?

12. In which among the following state each molecule of water consists of one oxygen atom and two hydrogen atoms remain in this ratio?

13. Which among the following is not triatomic molecule?

14. Which is an element that occurs naturally combined with other elements to make medicine for treating diarrhoea?

15. matter is classified into how many types?

16. Which among the following element is not present in common salt?

17. Which among the following element is not used for making crackers?

18. Which among the following is used as manure in agriculture?

19. Which among the following element is used for making computer chips?

20. How many known elements are there till date?

21. Elements can be broadly classified into how many types based upon their chemical properties?

22. In 118 known elements how many elements occur naturally?

23. Which among the following metal is soft?

24. Which among the following is the only metal that is liquid at room temperature?

25. Which among the following statement is correct
1. We have tools, utensils and jewellery made from silver, copper, iron, gold, Aluminium. Using pressure like hammering or rolling we can deform these materials into various shapes. Such elements that are malleable (a material may be flattened into thin sheets or various shapes) is called as metals.
2. Metals are generally hard and shiny elements. Metals are malleable, can be bent or beaten into sheets. They can be drawn into wires. They are good conductors of heat and electricity. Copper, Lead, tin, nickel, iron, zinc, gold, magnesium and calcium are examples of metals.

26. Which among the following is shiny and also the hardest natural substance on earth?

27. Which among the following Non-metal is not solid at room temperature?

28. Which is the only non-metal that is liquid at room temperature?

29. Which among the following Non-metal is a good conductor of electricity?

30. Which among the following is not the example of Metalloids?

31. Which is a pure substance that is formed when the atoms of two or more elements combine chemically in definite proportions?

32. Which among the following statement is correct
1. Compounds exhibit properties entirely different from the properties of their constituent elements. For example, the atoms of the elements hydrogen and oxygen combine chemically in a fixed ratio to form the compound water.
2. However, water does not have the exact same properties as hydrogen and oxygen. For example, at room temperature water exist as liquid while hydrogen and oxygen exist as gases. Also, oxygen supports fire whereas water is used as a fire extinguisher.
3. Similarly, common salt (sulphur chloride) is a compound made up of elements sulphur and chlorine. It is used in our food, whereas sulphur and chlorine are poison, are both unsafe for consumption.

33. Which among the following is the property of compounds?
1. A compound is formed when the constituent elements combine in a fixed or various proportion. The properties of a compound are different from those of its constituent elements. A compound cannot be separated into its constituent elements by chemical methods also.
2. A compound cannot be broken down by physical methods. This is because a compound is made up of different elements that are chemically combined. Sodium chloride cannot be separated by physical methods such as filtration.

34. Which among the following is not property of metal?
1. Metals are lustrous. They have a shiny surface generally hard and bendable. Most metals can be bent, beaten into sheets and they can draw into wires.
2. Most metals are good conductors of electricity and heat. Most metals are making ringing sound when struck. Hence, they are used to make objects like bells.

35. The symbol is usually derived from the name of the element, which is either in English or ___

36. The symbols of an element are allocated by whom?

37. Who was the first scientist to use the symbols for elements in a very specific sense?

38. Which among the following is the property of non-metal?
1. Non-metals are non-lustrous. They have non-shiny surface, generally soft and non-bendable. Non-metals are non-ductile.
2. Non-metals are bad conductors of electricity and heat. Non-metals does not make any sound when they struck.

39. Who suggested that the symbols of elements be made from one or two letters of the name of the element?

40. Which among the following statement is correct about assigning symbol to an element?
1. Chemical symbols usually consist of one or two letters. The symbols of most elements correspond to the first letter (which is capitalized) of their English name. For example, the symbol for oxygen is “O” and that for hydrogen is “H”.
2. When there is more than one element that begins with the same letter, their symbols take two letters. The first letter is capitalised while the second letter also capitalised. For example, the names of both hydrogen and helium begin with H. So, hydrogen is represented by the symbol H and Helium by HE.

41. Which among the following is the symbol of chromium?

42. Which among the following is the symbol of gold?

43. The symbols for copper is Cu after its Latin name _____

44. The name copper was taken from which place name?

45. Which among the following statement is correct
1. Often, we hear that water is H2O. This is the chemical formula for water molecule. This means that each molecule of water has two hydrogen atoms combined with one oxygen atom. A chemical formula is a symbolic representation of one molecule of an element or a compound.
2. It provides information about the elements present in the molecule and the number of atoms of each element. The chemical formula tells us the types of atoms and the number of each type of atom in one molecule of substance.
3. In water (H2O) there are 2 hydrogen atoms in water molecule and 1 oxygen atom in water molecule. In Sodium Chloride (NaCl) 1 atom of Sodium and 1 atom of chlorine. In Ammonia (NH3) 1atom of Nitrogen and 3 atoms of Hydrogen.

46. Which among the following is the chemical formula of Glucose?

47. In chemistry we usually understand what to imply the total number of atoms present in one molecule of an element, compound or a substance?

48. Which among the following statement is incorrect
1. Let we see how to calculate the atomicity of elements. For example, Oxygen exists as a diatomic molecule which means that a molecule of oxygen contains two atoms hence its atomicity is 2.
2. Similarly, a phosphorus (P5) molecule contains 5 atoms; a sulphur (S6) molecule contains 6 sulphur atoms. Hence their atomicity is 5 and 6 respectively.

49. What is the atomicity of Sulphuric acid?

50. Match the following compounds with its respective chemical formula?
i. Ethanol – 1. NH3
ii. Methane – 2. C2H6O
iii. Sucrose – 3. C12H22O11
iv. Ammonia – 4. CH4

51. The molecules of which two different elements, make up about 99% of the air?

52. Which is the lifegiving element in the air?

53. Who is the first scientist used the term element?

54. When solid is heated, the particles gain energy and vibrate vigorously. The particles move slightly further apart from one another. This causes the volume of matter to increase. This process is called ?

55. When air inside the hot air balloon is heated with a burner, it expands. The expansion causes the density of the air inside the balloon to ___________

56. Which among the following statement is correct
1. During heating or expansion, the mass of matter does not change. This is explained in the following way. During heating, the distance between the particles of the iron locks change. Mass is conserved when matter expands. Although, the volume of the matter changes, the size and number of the particles of matter do not change.
2. Hence, during heating, the mass of a matter is conserved. For example, in an iron lock the distance between the iron particles decreased when they gain enough heat. However, the number of iron particles does not change. Hence the mass of the iron lock is conserved.
3. The melting of ice is an example of a change in the states of matter. The change in the states of matter occurs during melting, boiling and freezing and condensation. When the particles possess enough energy, they overcome the strong forces of attraction between one another. The particles break free from one another and move randomly.

57. At what temperature the liquid water is heated, it boils to become steam?