Year 9 - Chemistry - 29-4-16

Thai Sikh International School

E-Learning Programme – Online Assignment –   dd/mm/yyyy

Name :                                                                                               Subject : Chemistry

Year   :  9A/B                                                                                    Schedule No. :  9        

Q1. What is meant by:

a.       Relative atomic mass

b.      Relative molecular mass

c.       Avogadro constant

Q2. Calculate the relative molecular masses of:

a.       Ammonium hydroxide, NH₄OH                                          b. Nitric acid, HNO₃         

c. Ammonium nitrate, NH₄NO₃                                                  d. Butane, C₄H₁₀              

e. Sodium Hydrogen Sulfate, NaHSO₄

Q3. What is the mass of one mole of:

a.       Ammonium nitrate, NH₄NO₃                                               b. Butane, C₄H₁₀              

b.      Sulfur dioxide, SO₂                                                                  d. Sodium hydroxide, NaOH

e.      Oxygen, O₂

Q4. Calculate the mass of:

a.       2 moles of nitric acid, HNO₃

b.      3 moles of Sodium hydrogen sulphate, NaHSO₄

c.       0.2 moles of ethene, C₂H₄

d.      10 moles of sodium carbonate, NaCO₃

e.      0.01 mole of sodium hydrogen carbonate, NaHCO₃

Q5.  How many moles are there in:

a.       36g of H₂O                                                                  

b. 14g of CO

c.       42g of N                                                                      

d.   42g of N₂

f.        10.6g of Na₂CO₃           

                                                           

g.        0.4g of NaOH

h.      9.8g of H₂SO₄                                                                                           

i.         g. 0.64g of SO₂

j.        1.8g of C₆H₁₂O₆

Q6. Complete the following table for hydrogen peroxide, H₂O₂:

No. of moles	Mass	No. of molecules
1		6x 1023
2
0.4
	17g
		9x1023

Q7. How many atoms are:

a.       1 mole of hydrogen, H

b.      2 mol of oxygen, O

c.       0.5 mol of carbon, C

Q8. How many molecules are:

a.       1 mol of methane, CH₄

b.      2 mol of oxygen, O₂

c.       0.5 mol of water, H₂O

Q9.  What mass of nitrogen, N₂, contains the same number of molecules as

a.       1 ml of hydrogen, H₂

b.      1.8g of water, H₂O

c.       6.02 x 10²³ molecules of methane, CH₄

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