Chemistry Form 1 Questions and Answers – Free Learning Material

Chemistry form 1 questions and answers

Chemistry Form 1 Questions and Answers

Chemistry Form 1 Questions and Answers is an attempt to encourage and help students check their knowledge of the subject.

1. What is an acid?

Answer: An acid is a substance that produces hydrogen ions (H+) when dissolved in water.

2. State the difference between physical and chemical change.

Answer: A physical change is a change in a substance’s appearance, such as its size or shape, but its chemical composition remains the same while chemical change is a change in a substance’s chemical composition.

3. What are the different states of matter?

Answer:

i. solid

ii. liquid

iii) gas

4. What are the common chemical symbols for the elements?

Answer: There are many chemical symbols for the elements, some examples include H for hydrogen, O for oxygen, and C for carbon.

5. How do you write a chemical formula?

Answer: Chemical formulas are written using the chemical symbols of the elements present in the compound and subscripts to indicate the number of atoms of each element present.

6. What is the mole?

Answer: The mole is the amount of a substance that contains the same number of entities as there are in 12 grams of pure carbon-12.

7. What is the Avogadro constant?

Answer: The Avogadro constant is the number of entities per mole of a substance. It is approximately 6.022 x 10^23 entities per mole.

8. What is the molar mass?

Answer: The molar mass is the mass of one mole of a substance.

9. What is the formula for density?

Answer: The formula for density is mass per unit volume, or D=m/V.

10. What are the units of density?

Answer: The units of density are typically grams per cubic centimeter (g/cm^3) or kilograms per liter (kg/L).

11. What are the common chemical changes that occur in everyday life?

Answer: Examples of chemical changes that occur in everyday life include cooking, rusting, and burning.

12. What is the difference between a mixture and a compound?

Answer: A mixture is made up of two or more substances that are physically combined but not chemically combined. A compound is made up of two or more elements that are chemically combined in a fixed ratio.

13. What is the chemical formula for water?

Answer: The chemical formula for water is H2O.

14. What is the formula for sulfuric acid?

Answer: The formula for sulfuric acid is H2SO4.

15. What is the difference between a metal and a nonmetal?

Answer: Metals are elements that are typically shiny, good conductors of heat and electricity, and have a high melting and boiling point. Nonmetals are elements that are typically dull, poor conductors of heat and electricity, and have a low melting and boiling point.

16. What is the chemical symbol for carbon?

The chemical symbol for carbon is C.

17. What is the process of electrolysis?

Answer: Electrolysis is the process of using electricity to break down a compound into its component elements.

18. What is the chemical formula for salt?

Answer: The chemical formula for salt is NaCl.

19. What is the difference between a chemical property and a physical property?

Answer: A chemical property is a characteristic of a substance that describes its ability to participate in chemical reactions, while a physical property is a characteristic of a substance that can be observed or measured without changing the substance’s chemical composition.

20. What is the chemical formula for baking soda?

Answer: The chemical formula for baking soda is NaHCO3.

21. What is the chemical formula for ethanol?

Answer: The chemical formula for ethanol is C2H5OH.

22. What is the chemical formula for hydrogen peroxide?

Answer: The chemical formula for hydrogen peroxide is H2O2.

23. What is the chemical formula for magnesium oxide?

Answer: The chemical formula for magnesium oxide is MgO.

24. What is the chemical symbol for sulfur?

Answer: The chemical symbol for sulfur is S.

25. What is the chemical formula for ammonia?

Answer: The chemical formula for ammonia is NH3.

26. What is the chemical formula for glucose?

Answer: The chemical formula for glucose is C6H12O6.

27. What is the chemical formula for chlorophyll?

Answer: The chemical formula for chlorophyll is C55H72MgN4O5.

28. What is the chemical formula for carbon dioxide?

Answer: The chemical formula for carbon dioxide is CO2.

29. What is the chemical formula for oxygen?

Answer: The chemical formula for oxygen is O2.

30. What is the chemical formula for hydrogen?

Answer: The chemical formula for hydrogen is H2.

31. What is the chemical formula for calcium oxide?

Answer: The chemical formula for calcium oxide is CaO.

32. What is the chemical formula for copper(II) sulfate?

Answer: The chemical formula for copper(II) sulfate is CuSO4.

33. What is the chemical formula for potassium hydroxide?

Answer: The chemical formula for potassium hydroxide is KOH.

34. What is the chemical symbol for gold?

Answer: The chemical symbol for gold is Au.

35. What is the chemical formula for nitric acid?

Answer: The chemical formula for nitric acid is HNO3.

36. What is the chemical formula for sulfuric acid?

Answer: The chemical formula for sulfuric acid is H2SO4.

37. What is the chemical formula for hydrogen chloride?

Answer: The chemical formula for hydrogen chloride is HCl.

38. What is the chemical formula for aluminum oxide?

Answer: The chemical formula for aluminum oxide is Al2O3.

39. What is the chemical formula for zinc oxide?

Answer: The chemical formula for zinc oxide is ZnO.

40. What is the chemical formula for copper(II) oxide?

Answer: The chemical formula for copper(II) oxide is CuO.

41. What is the chemical formula for sodium chloride?

Answer: The chemical formula for sodium chloride is NaCl.

42. What is the chemical formula for magnesium chloride?

Answer: The chemical formula for magnesium chloride is MgCl2.

43. What is the chemical formula for iron(II) oxide?

Answer: The chemical formula for iron(II) oxide is FeO.

44. What is the chemical symbol for silver?

Answer: The chemical symbol for silver is Ag.

45. What is the chemical formula for copper(II) carbonate?

Answer: The chemical formula for copper(II) carbonate is CuCO3.

46. What is the chemical formula for sodium hydroxide?

Answer: The chemical formula for sodium hydroxide is NaOH.

47. What is the chemical formula for potassium carbonate?

Answer: The chemical formula for potassium carbonate is K2CO3.

48. What is the chemical formula for calcium carbonate?

Answer: The chemical formula for calcium carbonate is CaCO3.

49. What is the chemical formula for iron(II) sulfate?

Answer: The chemical formula for iron(II) sulfate is FeSO4.

50. What is the chemical formula for copper(II) chloride?

Answer: The chemical formula for copper(II) chloride is CuCl2.

51. What is the chemical formula for magnesium sulfate?

Answer: The chemical formula for magnesium sulfate is MgSO4.

52. What is the chemical formula for sodium sulfate?

Answer: The chemical formula for sodium sulfate is Na2SO4.

53. What is the chemical formula for potassium sulfate?

Answer: The chemical formula for potassium sulfate is K2

54. What is a chemical equation?

Answer: A chemical equation is a representation of a chemical reaction using the chemical symbols of the elements involved and subscripts to indicate the number of atoms of each element present.

55. What are the common types of chemical reactions?

Answer: The common types of chemical reactions are synthesis, decomposition, single replacement, double replacement, and combustion reactions.

56. What is a catalytic reaction?

Answer: A catalytic reaction is a chemical reaction that proceeds with the assistance of a catalyst, which is a substance that speeds up the reaction without being consumed in the process.

57. What is the difference between a reactant and a product?

Answer: A reactant is a substance that takes part in a chemical reaction and is changed into a new substance while a product is a substance that is formed as a result of a chemical reaction.

58. What is the mole concept?

Answer: The mole concept is a way to express the amount of a substance in terms of the number of entities it contains.

59. What is a chemical bond?

Answer: A chemical bond is a force of attraction between atoms or ions that holds them together in a compound.

60. What are the different types of chemical bonds?

Answer: The different types of chemical bonds are ionic, covalent, and metallic bonds.

61. What is a chemical property?

Answer: A chemical property is a characteristic of a substance that describes its ability to undergo a chemical change or reaction.

62. What is a physical property?

Answer: A physical property is a characteristic of a substance that can be observed without changing its chemical composition.

63. What are the different types of mixtures?

Answer: The different types of mixtures are homogeneous mixtures and heterogeneous mixtures.

64. What is a gas?

Answer: A gas is a state of matter that has no fixed shape or volume and expands to fill the container it is in.

65. What is a liquid?

Answer: A liquid is a state of matter that has a fixed volume but no fixed shape and takes the shape of the container it is in.

66. What is a solid?

Answer: A solid is a state of matter that has a fixed shape and volume and does not conform to the shape of its container.

67. What are the common types of solutions?

Answer: The common types of solutions are liquid solutions, gas solutions, and solid solutions.

68. What is a chemical reaction rate?

Answer: A chemical reaction rate is the speed at which a chemical reaction occurs.

69. What are the factors that affect chemical reaction rate?

Answer: The factors that affect chemical reaction rate are temperature, concentration, surface area, and the presence of a catalyst.

70. What is a chemical equilibrium?

Answer: A chemical equilibrium is a state in which the rates of the forward and reverse reactions are equal and the concentrations of the reactants and products remain constant.

71. What is the Law of Mass Action?

Answer: The Law of Mass Action is a mathematical relationship between the rates of the forward and reverse reactions and the concentrations of the reactants and products.

72. What is a buffer solution?

Answer: A buffer solution is a solution that can resist changes in pH when small amounts of an acidic or basic substance are added to it.

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