what happens in the following cases?. also, write their balanced chemical equation. 1) mixture of Sulphur and iron is heated. 2) magnesium ribbon burns in air. 3) potassium comes in contact with water. 4) sodium comes in contact with water . 5) sodium chloride solution is mixed with silver nitrate solution. 6) potassium iodide solution is mixed with lead nitrate solution. 7) carbon dioxide and water react in the presence of sunlight and chlorophyll. 8) sodium bicarbonate is heated. 9)hydrogen reacts with oxygen gas. 10)carbon burns in the presence of oxygen
Answers
Answer:
Explanation:
1.A mixture is made when you combine matter in a way where the components can be separated again. A compound results from a chemical reaction between components, forming a new substance. For example, you can combine iron filings with sulfur to form a mixture. All it takes is a magnet to separate the iron from the sulfur. On the other hand, if you heat the iron and sulfur, you form iron sulfide, which is a compound.
Fe+S→FeS
2.When magnesium ribbon burns in presence of oxygen. We could observe a dazzling white flame and a white substance named magnesium oxide.
2Mg+O ^2 ⟶2MgO
3.(a) Potassium bromide(aq) + Barium iodide(aq) → Potassium iodide(aq) + Barium bromide(s)
4.Sodium + Water → Sodium hydroxide + Hydrogen
2Na(s)+2H 2 O(l)→2NaOH(aq)+H 2 (g)
5.When silver nitrate (AgNO 3 ) reacts with sodium chloride (NaCl) a white precipitate of silver chloride (AgCl) is formed which is highly insoluble in water, along with formation of sodium nitrate (NaNO 3 ). Since (AgCl) is insoluble in water it will precipitate out and (NaNO 3 ) is soluble in water so it will remain dissolved in the mixture. This reaction is an example of double displacement reaction and it occurs as follows:-
AgNO 3 + NaCl→AgCl + NaNO 3
6.The given reaction is a double displacement reaction.
2KI (aq.) +Pb(NO 3 ) 2 (aq.) ⟶2KNO 3 (aq.) +PbI 2 (s)
7.CARBON DIOXIDE + WATER + SUNLIGHT CHLOROPHYLL GLUCOSE +OXYGEN
8.Sodium carbonate or washing soda or soda ash is the sodium salt of carbonic acid. It is prepared by passing carbon dioxide gas in a concentrated solution of sodium hydroxide. Further on heating, sodium bicarbonate gives sodium carbonate, CO^2 and water.
NaHCO 3 →Na 2 CO 3 +CO 2 +H 2 O
9.Hydrogen sulphide (H 2 S) reacts with oxygen (O 2 ) to form solid sulphur (S) and water(H 2 O). It is a redox reaction as both oxidation of hydrogen sulphide to sulphur and reduction of oxygen to water takes place. The equation can be written as2H 2 S+O 2 →2S+2H 2 O
10.Ethene (C 2 H 4 ) burns in the presence of oxygen (O 2 ) to form carbon dioxide (CO 2 ) and water (H 2 O) along with the evolution of heat and light. This is a combustion reaction and equation for this can be written as: C 2 H 4 (g)+3O 2 (g)→2CO 2 (g)+2H 2 O(l)+heat+light