Sodium Hydrogen Carbonate | NaHCO3
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The figure below shows the apparatus a student used to investigate the effect of strong heating on sodium hydrogencarbonate, NaHCO3.
The table below shows observations the student made before and after heating the sodium hydrogencarbonate for several minutes.
- State two observations from the table which show that a chemical reaction occurs when sodium hydrogencarbonate is heated.
- The white solid which remains in flask A after heating is sodium carbonate. Write the equation for the effect of strong heating on sodium hydrogencarbonate.
- Choose from the following list of substances to answer the questions below.
Name a substance which is
- a gas at room temperature.
- a liquid conductor of electricity at room temperature.
- a compound which is a solid at room temperature.
b. The table below shows some information about two elements X and Y. Both elements are in the third period of the Periodic Table. Complete the table by writing the words high or low in the empty boxes. Two of the boxes have already been completed.
c. A student set up the apparatus shown in the diagram below.
The white solid is formed because the molecules of hydrogen chloride gas and ammonia gas move at random throughout the tube and eventually react with each other.
- State the formula of the white solid formed at X.
- Suggest why the white solid is formed towards one end of the tube and not in the middle.
- Name the type of chemical reaction that takes place when aqueous ammonia reacts with hydrochloric acid. Give the ionic equation for the reaction.
Give the chemical name of an example of each of the following :
- A gas that turns damp red litmus paper blue….
- A green powder that decomposes on heating to produce carbon dioxide….
- An acid that gives a white precipitate with aqueous barium nitrate….
- A compound whose aqueous solution gives a brown precipitate with dilute sodium hydroxide….
- A metal compound that produced a pungent smelling gas when heated with sodium hydroxide and aluminium powder…..
Miracle Learning Centre (O Level Chemistry Tuition/ IP Chemistry Tuition)
Did you answer the Chemistry Tuition Question correctly?
- Appearance of water  Limewater becoming cloudy/reactive gas formed 
- 2NaHCO3 Na2CO3 + H2O + CO2 ; formula – 1m, balanced 1m
- (i) chlorine (ii) mercury (iii) sodium chloride
- X – high, high. Y – low, low
- (i) NH4Cl (ii) ammonia travel faster or vice versa
- neutralisation  H+ + OH- H2O 
- copper(II) carbonate
- sulphuric acid
- iron(III) sulphate/nitrate/chloride
- any metal nitrate
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