Back to Course

SS2: CHEMISTRY - 3RD TERM

0% Complete
0/0 Steps
  1. Hydrogen and its Compounds | Week 1
    7 Topics
    |
    1 Quiz
  2. Oxygen and its Compounds | Week 2
    7 Topics
    |
    1 Quiz
  3. Halogens, Chlorine and its Compounds | Week 3
    7 Topics
    |
    1 Quiz
  4. Hydrogen Chloride and Hydrochloric Acid | Week 4
    5 Topics
    |
    1 Quiz
  5. Nitrogen and Its Compounds | Week 5
    9 Topics
    |
    1 Quiz
  6. Ammonia | Week 6
    9 Topics
    |
    1 Quiz
  7. Sulphur and its Compounds | Week 7
    13 Topics
    |
    1 Quiz
  8. Hydrocarbons | Week 8
    12 Topics
    |
    1 Quiz
  9. Alkanols | Week 9
    4 Topics
    |
    1 Quiz



Lesson Progress
0% Complete

Topic Content:

  • Theory Questions & Answers – Hydrogen and its Compounds

Theory Questions & Answers – Hydrogen and its Compounds:

1. (a). To what group of the periodic table does the element hydrogen belong? Give reasons for your answer

(b). Name the isotopes of hydrogen and identify the radioactive isotope.

2. (a). Give two methods of preparation of hydrogen in 

(i). the laboratory

(ii). the industry

Support your answer with a balanced chemical equation in each case.

3. (a). State any three

(i). physical properties of hydrogen

(ii). chemical properties of hydrogen

(b). How would you know a sample of a gas is hydrogen?

4. (a). Name one ionic hydride and one covalent hydride 

(b). Give three uses of hydrogen.

 

You are viewing an excerpt of this Topic. Subscribe Now to get Full Access to ALL this Subject's Topics and Quizzes for this Term!

Click on the button "Subscribe Now" below for Full Access!

Subscribe Now

Note: If you have Already Subscribed and you are seeing this message, it means you are logged out. Please Log In using the Login Button Below to Carry on Studying!

avataravataravataravatar

Responses

Your email address will not be published. Required fields are marked *

Powered By MemberPress WooCommerce Plus Integration

Theory Questions & Answers

1. (a). To what group of the periodic table does the element hydrogen belong? Give reasons for your answer.

Answer:

Group 1 and Group 7

Group 1 – It can donate its electron to react with non-metals e.g. HCl

Group 7- It can gain electrons + react with metal + form hydride e.g. NaH

 

(b). Name the isotopes of hydrogen and identify the radioactive isotope.

Answer:

  • Protium
  • Denterium
  • Tritium

 

2. (a). Support your answer with a balanced chemical equation in each case.

Give two methods of preparation of hydrogen in:

(i). the laboratory

Answer:

Atom of Dilute acid on zinc or iron

Zn(s) + H2SO4(aq)  → ZnSO4(aq) + H2(g)

Action of sodium metals on cold water

2Na(s) + 2H2O(l)  2NaOH(aq) + H2(g)

 

(ii). the industry

Answer:

From water gas

C(s) + H2O(g) CO(g) + H2(g)

From natural gas and hydrocarbon

CH4(g) + H2O(g) CO(g) + 3H2(g)

 

3. (a). State any three:

(i). Physical properties of hydrogen

Answer:

1. Hydrogen is a gas which colourless, odourless and tasteless

2. It is insoluble in water

3. It has a melting point of 259.20C and a boiling point of – 252.770C

 

(ii). Chemical properties of hydrogen

Answer:

1. It undergoes a combination reaction with non-metals and metals

H2 + Cl2 2HCl

Ca + H2 → CaH2

2. It acts as a reducing agent CuO(s) + H2(g)  → Cu(s) + H2O(g)

3. It reacts with unsaturated organic compounds

CH2=CH2 + H2 → CH3–CH3 

 

(b). How would you know a sample of a gas is hydrogen?

Answer:  A lighted wooden splint will burn with a pop sound in a tube with hydrogen gas

 

4. (a). Name one ionic hydride and one covalent hydride 

Answer: 

Ionic hydride ⇒ 2NaH

Covalent hydride ⇒ HCl

 

(b). Give three uses of hydrogen.

Answer:

  • It is used in the manufacture of ammonia, hydrochloric acid, and methanol.
  • It is an important combustible constituent of fuel.
  •   In the production of synthetic petroleum by hydrogenation of coal.