Sodium Hydrogen Carbonate | NaHCO3

01 Mar Sodium Hydrogen Carbonate | NaHCO3

In our Chemistry classes students are given concise notes and are given simplified solutions for all the critical topics. Apart from this, students are also provide with a lot of question papers to make them able to understand the possible question patterns and make them answer those questions easily. We try our best to be one of the best chemistry tuition Singapore by helping students to learn easily and effectively from the best chemistry teachers of Singapore.

Question 1

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.

  1. State two observations from the table which show that a chemical reaction occurs when sodium hydrogencarbonate is heated.
  2. 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.

Question 2

  1. Choose from the following list of substances to answer the questions below.

Name a substance which is

  1. a gas at room temperature.
  2. a liquid conductor of electricity at room temperature.
  3. 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.

  1. State the formula of the white solid formed at X.
  2. Suggest why the white solid is formed towards one end of the tube and not in the middle.
  3. Name the type of chemical reaction that takes place when aqueous ammonia reacts with hydrochloric acid. Give the ionic equation for the reaction.

Question 3

Give the chemical name of an example of each of the following :

  1. A gas that turns damp red litmus paper blue….[1]
  2. A green powder that decomposes on heating to produce carbon dioxide….[1]
  3. An acid that gives a white precipitate with aqueous barium nitrate….[1]
  4. A compound whose aqueous solution gives a brown precipitate with dilute sodium hydroxide….[1]
  5. A metal compound that produced a pungent smelling gas when heated with sodium hydroxide and aluminium powder…..[1]

Miracle Learning Centre (O Level Chemistry Tuition/ IP Chemistry Tuition)

Did you answer the Chemistry Tuition Question correctly?

Answers

Question 1

  1. Appearance of water [1] Limewater becoming cloudy/reactive gas formed [1]
  2. 2NaHCO3  Na2CO3 + H2O + CO2 ; formula – 1m, balanced 1m

Question 2

  1. (i) chlorine (ii) mercury (iii) sodium chloride
  2. X – high, high. Y – low, low
  3. (i) NH4Cl (ii) ammonia travel faster or vice versa
  4. neutralisation [1] H+ + OH-  H2O [1]

Question 3

  1. ammonia
  2. copper(II) carbonate
  3. sulphuric acid
  4. iron(III) sulphate/nitrate/chloride
  5. any metal nitrate

Learn from our Chemistry Tuition Question and Answer.

Miracle Learning Centre Call 6463 8756 or sms 8128 8342/9839 9908.

(Specialist in Science and Maths) for Primary, Secondary and JC levels.

Miracle Learning Centre specialises in Physics tuition, Chemistry tuition, Maths tuition and Science tuition Classes.

No Comments

Sorry, the comment form is closed at this time.