Advertisements
Advertisements
Question
What is wrong with the following chemical equation?
\[\ce{Mg + O -> MgO}\]
Correct and balance it.
Advertisements
Solution
In this reaction, oxygen is written as O, but it is a diatomic molecule, and it is stable; its formula is O2.
The correct balanced chemical equation is:
\[\ce{2MgO -> 2Mg + O2}\]
APPEARS IN
RELATED QUESTIONS
Translate the following statement into chemical equation and then balance it.
Hydrogen gas combines with nitrogen to form ammonia
What does the symbol (aq) represent in a chemical equation?
Give one example of a chemical reaction.
Balance the following equation:
\[\ce{H2O2 -> H2O + O2}\]
Balance the following equation:
\[\ce{NaOH + H2SO4 -> Na2SO4 + H2O}\]
Chemical equations are balanced to satisfy the law of ______.
Write a balanced chemical equation for the process of photosynthesis giving the physical states of all the substances involved and the conditions of the reaction.
With the help of an appropriate example, justify that some of the chemical reactions are determined by a change in temperature.
Give a chemical equation for the reaction involved in the above case.
Which of the following does not involve a chemical reaction?
The metal M reacts vigorously with water to form a solution S and a gas G. The solution S turns red litmus to blue whereas gas G, which is lighter than air, burns with a pop sound. Metal M has a low melting point and it is used as a coolant in nuclear reactors.
- What is metal M?
- What is solution S? Is it acidic or alkaline?
- What is gas G?
- Write a balanced chemical equation for the reaction which takes place when metal M reacts with water.
- Is this reaction exothermic or endothermic?
Balance the following equation:
Zn + KOH → K2ZnO2 + H2
Name the fundamental law that is involved in every equation.
\[\ce{MnO2 + 4HCl -> MnCl2 + 2H2O + Cl2}\]
0.02 moles of pure MnO2 is heated strongly with conc. HCl. Calculate moles of salt formed.
A chemical reaction is generally accompanied by certain external indications or characteristics. These include – change of – (a) colour (b) state (c) smell (d) evolution of gas (e) formation of precipitate (f) evolution or absorption of heat. With reference to change of colour – state the change in colour seen when the following are heated – lead [IV] oxide.
In certain reaction an insoluble solid called precipitate is formed. State the colour and name of the precipitate formed in the following reaction involving addition of:
Dilute hydrochloric acid to silver nitrate.
Name the following:
The silvery residue obtained on heating mercury [II] oxide.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
\[\ce{ZnCo3->[\triangle] ZnO + CO2}\]
Balance the following simple equation:
NaOH + Cl2 → NaCl + NaClO + H2O
Balance the following simple equation:
NaHCO3 + H2SO4 → Na2SO4 + H2O + CO2
Write a balanced equation for the following word equation:
Aluminium + Oxygen → Aluminium oxide
