ICSE ICSE Class 8 - CISCE Question Bank Solutions for Chemistry

Complete and balance the following chemical equations:

`"H"_2"S"` + `"CI"_2`  `→`  

Complete and balance the following chemical equations

Na + H₂ O →

Complete and balance the following chemical equations

NaCI + `AgNO_3`  `→`

Complete and balance the following chemical equations:

Zn + `"H"_2"SO"_4`  `→`

           (dil)

Complete and balance the following chemical equations:

Fe `"SO"_4`  + NaOH  `→`

   (aq.)          (aq.)

Complete and balance the following chemical equation:

\[\ce{Pb(NO3)2 ->[Heat]}\]

Complete and balance the following chemical equations:

Ba`"CI"_2`   +  `"H"_2"SO"_4`   `→`

    (aq.)           (aq.)

Fill in the blanK

 A .............is a substance which changes the rate of a chemical reaction without undergoing a chemical change.

 Fill in the blank.
 The formation of gas bubbles in a liquid during a reaction is called ......................

Fill in the blank.

The reaction between an acid and a base is called ..................

Fill in the blank

 A catalyst either ................or ............... the rate of a chemical change but itself remains ............... at the end of the reaction.

Water is used as a cooling agent.

Give reason of Water pipes burst in severe winter.

Give reason of Ice floats on water.

 Give reason for Sea water does not freeze at 0°C.

How does the anomalous expansion of water help aquatic organisms in cold climates?

Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{NH3_{(g)} + HCl_{(g)} -> NH4Cl_{(s)}}\]

Classify the following reaction as combination, decomposition, displacement, precipitation and neutralization. Also balance the equation.

\[\ce{CuSO4_{(aq)} + H2S_{(s)} -> CuS_{(s)} + H2SO4_{(l)}}\]

Define precipitation reaction.

Define neutralization.