Questions

Differentiate: Flat Universe and Closed Universe

Differentiate: Closed Universe and Open Universe

Samir burns a magnesium ribbon which is like a small strip or a ribbon. It burns brightly and forms white ash 'A’. Write the name of substance ‘A’. Write a balanced chemical reaction of the process.

Four students A, B, C, and D are allowed to carry out decomposition reactions in the laboratory. All of them perform it differently as given below.

1. Student A burnt magnesium (Mg) ribbon
2. Student B mixed Zn in FeSO₄ solution
3. Student C heated KClO₃ in a hard glass test tube
4. Student D mixed Zn and HCl solution

Which student followed the correct procedure? Write the balanced chemical reaction of that process.

What is the type of chemical reaction occurring inside the test tube shown in the given figure? Write the balanced chemical equation of that reaction. (Reaction of cupper sulphate with iron)

What do you mean by a decomposition reaction? Write its two examples with their balanced chemical equations.

What do you mean by a displacement reaction? Write its two examples with their balanced chemical equations.

What is the rate of chemical reaction? Write any four factors which affect the rate of chemical reaction.

What do you mean by a chemical reaction? Explain with an example.

$\rm Al + H_{2}SO_{4} → Al_{2}(SO_{4})_{3} + H_{2}$. Balance the chemical equation and mention its type.