C03 - Chemical Formulae And Equation

27 Questions | Total Attempts: 82

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C03 - Chemical Formulae And Equation

Chemistry Form 4 Chapter 2 Chemical Formulae and Equation


Questions and Answers
  • 1. 
    The proton number of sodium atom is 11 and its molar mass is 23 g/mol. What is the relative atomic mass sodium atom.
    • A. 

      11

    • B. 

      12

    • C. 

      23

    • D. 

      34

  • 2. 
    The chemical formula for aluminium sulphate is   . What is its relative formula mass? [ Relative atomic mass : O = 16, Al = 27, S = 32 ]
    • A. 

      123

    • B. 

      150

    • C. 

      182

    • D. 

      342

  • 3. 
    The chemical formula for tetrachloromethane is . What is the relative molecular mass of tetrachloromethane? [ Relative atomic mass : C = 12, Cl = 35.5 ]
    • A. 

      154.0

    • B. 

      118.5

    • C. 

      83.0

    • D. 

      47.5

  • 4. 
    What is the relative molecular mass of hydrated magnesium sulphate .  [ Relative atomic mass : Mg = 24, S = 32, O = 16, H = 1 ]
    • A. 

      145

    • B. 

      246

    • C. 

      305

    • D. 

      356

  • 5. 
    The chemical formula for pottasium hexacyanoferrate (III) is  . What is its relative formula mass. [ Relative atomic mass : C=12, N=14, K=39, Fe=56 ]
    • A. 

      121

    • B. 

      199

    • C. 

      251

    • D. 

      329

  • 6. 
    The information regarding elements M and T are as follows: What is the molar mass of the compound formed when M and T react with each other?
    • A. 

      62 g/mol

    • B. 

      43 g/mol

    • C. 

      32 g/mol

    • D. 

      30 g/mol

  • 7. 
    Table shows the electron arrangement and nucleon number for atoms E and G. Based on the table, what is the relative molecular mass for compound formed when E reacts with G?
    • A. 

      62

    • B. 

      64

    • C. 

      97

    • D. 

      132

  • 8. 
    The relative formula mass hydrated X carbonate.  is 286. What is the relative atomic mass of element X.  [ Relative atomic mass : H=1, C=12, O=16 ]
    • A. 

      23

    • B. 

      46

    • C. 

      120

    • D. 

      240

  • 9. 
    The electron arrangement of atom U is 2.8.1 and atom V is 2.8.7. What is the molar mass of a compound formed when atom U combines with atom V? [Relative atomic mass: U=23, V=35.5]
    • A. 

      152.5 g/mol

    • B. 

      94.0 g/mol

    • C. 

      81.5 g/mol

    • D. 

      58.5 g/mol

  • 10. 
    The average mass of a magnesium atom is 24 times greater than 1/12 of the mass of a carbon-12 atom. What is the relative atomic mass of magnesium?
    • A. 

      2

    • B. 

      12

    • C. 

      24

    • D. 

      48

  • 11. 
    Hoe many times are 2 copper atoms haevier than an oxygen atom? [Relative atomic mass: O=16, Cu=64]
    • A. 

      4

    • B. 

      8

    • C. 

      16

    • D. 

      64

  • 12. 
    The mass of three atoms of element X is equal to the mass of four carbon atoms. X is not the actual symbol of the element. What is the relative atomic mass of element X. [Relative atomic mass: C=12 ]
    • A. 

      48

    • B. 

      36

    • C. 

      16

    • D. 

      12

  • 13. 
    The mass of two atoms of elemnt X is equal to that of three atoms of sulphur. What is the relative atomic mass of element X? [Relative atomic mass: S=32 ]
    • A. 

      96

    • B. 

      48

    • C. 

      32

    • D. 

      24

  • 14. 
    8 atoms of element Z have the same mass as in 1 atom of tellurium, Te. Based on the statement above, what is the relative atomic mass of element Z? [Relative atomic mass: Te=128 ]
    • A. 

      8

    • B. 

      16

    • C. 

      32

    • D. 

      64

  • 15. 
    Table shows the proton number and the nucleon number of atoms of elements X and Y. X and Y are not the actual symbols of the elements. Element X reacts with element Y to from a compound. What is the molar mass of the compound?
    • A. 

      43 g/mol

    • B. 

      50 g/mol

    • C. 

      102 g/mol

    • D. 

      113 g/mol

  • 16. 
    Element J and element Q have proton number of 12 and 9 respectively. What is the relative formula mass of a compound formed between J and Q? [Relative atomic mass: J=24, Q=19 ]
    • A. 

      30

    • B. 

      43

    • C. 

      62

    • D. 

      67

  • 17. 
    What is the defination of a mole? Given Number Avagadro =
    • A. 

      The volume occupied by No Avagadro particles

    • B. 

      The mass of a substance which consist of No. Avagadro atoms

    • C. 

      The molecular mass of a substance which consist of No. Avagadro molecules

    • D. 

      The quantity of a substance which has the same number of partivles as the number of atoms in 12.00 g of carbon-12

  • 18. 
    The relative atomic mass of an element X is defined as
    • A. 

      (Mass of one atom of X)/(1/12 mass of one corbon-12 atom)

    • B. 

      (12 mass of one atom of X)/(Mass of one carbon-12 atom)

    • C. 

      (Mass of one atom of X)/(12 mass of one carbon-12 atom)

    • D. 

      (Mass of one mole of atom X)/(1/12 mass of one carbon-12 atom)

  • 19. 
    Which of the following is correct for relative molecular mass?
    • A. 

      (Mass of an atom)/(1/12 mass of one carbon-12 atom)

    • B. 

      (Mass of one molecule)/(1/12 mass of one carbon-12 molecule)

    • C. 

      (Mass of one molecule)/(1/12 mass of one carbon-12 atom)

    • D. 

      (Mass of an atom)/(1/12 mass of one carbon-12 molecule)

  • 20. 
    Which of the following statements is true for one mole of a substance? Given No. Avagadro =
    • A. 

      1 mole of copper contains No. Avagadro molecules

    • B. 

      1 mol of oxygen gas contains No. Avagadro atoms

    • C. 

      1 mol of water contains the same number of atoms as in 12g of carbon-12

    • D. 

      1 mol of carbon dioxide contains the same number of molecules as the number of atoms in 12 g of carbon-12

  • 21. 
    Calsium carbonate,  is the main component of marble. How many moles of atom of each element is present in 1 mol of calcium carbonate?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 22. 
    What is the number of atoms in 0.5 mol of ammonia gas, ?  [Avagadro constant = ] A.      B.     0.5 x C.     0.5 x 2 x D.     0.5 x 4 x
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

  • 23. 
    Avagadro number is the number of [Relative atomic mass: He=4, C=12, Cl=35.5 and Ca=40]
    • A. 

      Atoms in 12 g of carbon-12

    • B. 

      Atoms in 8 g of helium

    • C. 

      Molecules in 35.5 g of chlorine

    • D. 

      Chloride ions in 11 g of calcium chloride

  • 24. 
    A baloon contains   of gas particle. What is the number of moles of the gas in the baloon?
    • A. 

      0.5 mol

    • B. 

      1.0 mol

    • C. 

      3.0 mol

    • D. 

      6.0 mol

  • 25. 
    One mole of a substance is defined as the quantity of a substance that contains the same number of particles as in m g of element Y. What are m and Y?
    • A. 

      A

    • B. 

      B

    • C. 

      C

    • D. 

      D

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