Trending ▼   ResFinder  

ICSE Class X Notes 2024 : Chemistry (Ambassador School, Dubai) : -

2 pages, 10 questions, 0 questions with responses, 0 total responses,    0    0
Arya Limaye
Ambassador School, Dubai
+Fave Message
ProfileTimelineUploads
 Home > aryalimaye >   F Also featured on: School Page

Formatting page ...

MOLE CONCEPT AND STIOTIOMETRY TEST 1 Total 20 marks 40 min Question 1 (3 marks) When heated, potassium permanganate decomposes according to the following equation: 2KMnO4 K2MnO4 + MnO2 + O2 Some potassium permanganate was heated in a test tube. After collecting one litre of oxygen at room temperature, it was found that the test-tube had undergone a loss in mass of 1.32 g. If one litre of hydrogen under the same condition of temperature and pressure has a mass of 0.0825 g, calculate the relative molecular mass of oxygen. Question 2 (1 + 1 + 1 = 3 marks) a. State Avogadro s law. b. Define molar volume. c. The mass of 5.6 L of certain gas is 12 g. What is the relative molecular mass. Question 3 ( 3 marks) A metal M forms a volatile chloride containing 65.5% chlorine. If the density of the chloride relative to hydrogen is 162.5, find the molecular formula of the chloride. (M = 56, Cl = 35.5). Question 4 (2 + 2 = 4 marks) The equations given below relate to the manufacture of sodium carbonate. (i) NaCl + NH3 + CO2 + H2O NaHCO3 + NH4Cl (ii) 2NaHCO3 Na2CO3 + H2O + CO2. (a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate. [Molecular weight of Na = 14, H = 1, C = 12 and O = 16). (b) To produce the mass of sodium hydrogen carbonate calculated in (a), what volume of carbon dioxide, measured at s.t.p., would be required. Question 5 ( 2 + 2 = 4 marks) 560 ml of carbon monoxide is mixed with 500 ml of oxygen and ignited. The chemical equation for the reaction is as follows: 2CO + O2 2CO2. Calculate the volume of oxygen used and carbon dioxide formed in the above reaction. Question 6 ( 1 + 1 + 1 = 3 marks) Oxygen is produced by heating KClO3 using MnO2 as a catalyst. a. Calculate the mass of KClO3 required to produce 6.72 L of oxygen at STP. b. Calculate the number of moles of oxygen present in the mass that you calculated in Part (a) above. c. Also calculate the number of molecules. (K = 39; Cl = 35.5; O = 16)

Formatting page ...

 

  Print intermediate debugging step

Show debugging info


 

 

© 2010 - 2025 ResPaper. Terms of ServiceContact Us Advertise with us

 

aryalimaye chat