Short answer questions.
1.Name the conditions that control a chemical reaction
2. Give a chemical test to identify ammonia.
3. What happens when magnesium ribbon is burnt in air? Give the word and chemical
equations
4.What happens when an electric current is passed through water ? Give the word and chemical equations.
5.What will you observe when hydrochloric acid is added to test tube containing sodium carbonate ? Give the word and chemical equations.
6.When ammonium chloride is heated strongly, a gas of specific odour evolves. Give the word and chemical equations. Name the type of this reaction.
7. When happens when a moist red litmus paper is brought near the ammonium gas ?
8. Name a compound which on heating releases ammonia gas and a compound which dissociates to give out carbon dioxide gas.
Answers
Answer:
you could give your questions separately.
Explanation:
Chemical reactions in the cell are catalyzed by enzymes, which are protein molecules that speed up reactions. Each protein catalyzes a specific reaction. ... They can mechanically turn the enzyme on and off and control how fast the chemical reaction occurs.
Ammonium ions can be identified in a solution by adding dilute sodium hydroxide solution and gently heating. If ammonium ions are present, they will be converted to ammonia gas. Ammonia has a characteristic choking smell. It also turns damp red litmus paper or damp universal indicator paper blue.
When magnesium ribbon burns in presence of oxygen. We could observe a dazzling white flame and a white substance named magnesium oxide.
2Mg+O2⟶2MgO
When electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
When dilute HCl, which is an acid, added to sodium carbonate, a strong base, the neutralization reaction occurs by the formation of NaCl and the evolution of carbon dioxide gas by brisk effervescence.
2HCl+Na2 CO 3 ⟶2NaCl+CO 2 +H 2O
(i) Alkalis reacts with ammonium salts on heating to liberate ammonia gas.
Ca(OH) 2 +2NH 4 Cl→CaCl 2 +2NH3 +H2 O
(ii) When sodium nitrite reats with ammonium chloride nitrogen gas is liberated.
NaNO2+NH4 Cl→NaCl+N2+2H2 O
When a piece of moist red litmus paper is placed in a jar of ammonia it is turned to blue as the ammonia gas is basic in nature and this property converts the red litmus to blue. This litmus paper test confirms the alkalinity of the ammonia gas.
ammonium chloride