Advertisements
Advertisements
प्रश्न
Explain, with an example, how the physical states of the reactants and products can be shown in a chemical equation.
Advertisements
उत्तर
Physical state of reactants and products can be shown by writing (s) for solid, (l) for liquid, (aq) for aqueous solution and (g) for gaseous substance after its formula or symbol in a chemical reaction.
Carbon is in solid form, and carbon dioxide and oxygen are in gaseous form.
\[\ce{C_{(s)} + O2_{(g)} -> CO2_{(g)} + HEAT}\]
APPEARS IN
संबंधित प्रश्न
Methyl orange is used as an indicator. It shows colour change in acid, base and neutral substance. Tabulate your result as follows:
| Indicator | Colour change | Inference |
| Methyl Orange | No change | ...................... |
| .................... | Acid | |
| Yellow | ....................... |
Give one example of a chemical reaction.
Give one example of a chemical reaction characterised by formation of a precipitate.
Give one example of an endothermic reaction.
When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.
(a) Name any two metals which can behave like metal X.
(b) Name any two acids which can behave like acid Y.
(c) Name the gas Z.
(d) Is the gas Z lighter than or heavier than air?
(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic?
(f) By taking a specific example of metal X and dilute acid Y, write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.
What happens when silver nitrate solution is added to sodium chloride solution?
Write the equation for the reaction which takes place.
Write symbolic representation for the following word equation and balance them :
Iron + Sulphur → Iron sulphide.
Complete the following equation:
CH2 + H5OH `("Hot Conc." H_2SO_4)/`>
Complete the following equation:
CH3COOH + NaOH →
Balance the following equation:
NaHCO3 → Na2CO3 + H2O + CO2
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of chlorine gas formed.
Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Zinc reacts with silver nitrate to produce zinc nitrate and silver.
Identify the type of reaction taking place of the following case and write the balanced chemical equation of the reaction:
Potassium iodide reacts with lead nitrate to produce potassium nitrate and lead iodide.
Name the substance that is getting oxidised in the thermit process.
Write word equation for the following molecular equation:
CaO + H20 → Ca (OH)2 + Δ
Word equation:
State why [+ Δ ] is not written in the reaction, if ZnO reacts with H2O.
Explain the term ‘chemical equation’.
Balance the following simple equation:
H2S + Cl2 → S + HCl
Balance the following simple equation:
Zn + HCl → ZnCl2 + H2
Write scientific reason.
Adding zinc particles to a solution of copper sulphate makes the blue solution colorless.
What is a reactant in a chemical equation?
