Chemistry
Which of the following equations represents an endothermic reaction?
- C + O2 CO₂
- CaO + H2O → Ca(OH)2
- NaOH + HCl → NaCl + H₂O
- CaCO3 CaO + CO₂
Chemical Reaction
2 Likes
Answer
CaCO3 CaO + CO₂
Reason — An endothermic reaction is a type of reaction that absorbs heat from the surroundings. This means energy is required to break bonds in the reactants, and the products have more energy than the reactants. The decomposition of calcium carbonate (CaCO₃) into calcium oxide (CaO) and carbon dioxide (CO₂) requires heat to proceed.
Answered By
2 Likes
Related Questions
The gas produced when iron metal reacts with dilute hydrochloric acid is:
- oxygen
- hydrogen
- chlorine
- water vapour
When copper metal is added to a solution of silver nitrate, the colour of the solution changes to blue. This shows:
- copper is less reactive than silver
- copper is more reactive than silver
- both are equally reactive
- none of the above
Assertion (A): A chemical reaction is a process which involves the transformation of one or more substances into new substances with entirely different properties.
Reason (R): Breaking of chemical bonds between the atoms of reacting susbtances takes place to form new bonds between the atoms forming new substances called as products.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.
Assertion (A): A chemical equation must be balanced in order to follow the law of conservation of mass.
Reason (R): A chemical equation called as skeletal equation may not have equal number of atom of each element present in the reactants and products.
- Both A and R are true and R is the correct explanation of A.
- Both A and R are true but R is not the correct explanation of A.
- A is true but R is false.
- A is false but R is true.