Home
Class 10
CHEMISTRY
• Take a small amount of calcium oxide o...

• Take a small amount of calcium oxide or quick lime in beaker.
• Slowly add water to this.

• Touch the beaker as shown in Fig.
Do you feel any change in temperature?

Text Solution

Verified by Experts

Yes, its temperature has increased highly. following reaction takes place :
`CaO + H_2O + Ca(OH)_2 + "Heat"`
Doubtnut Promotions Banner Mobile Dark
|

Topper's Solved these Questions

  • CHEMICAL REACTIONS AND EQUATIONS

    NAND LAL PUBLICATION|Exercise ACTIVITY 1.5|1 Videos

  • CHEMICAL REACTIONS AND EQUATIONS

    NAND LAL PUBLICATION|Exercise ACTIVITY 1.6|1 Videos

  • CHEMICAL REACTIONS AND EQUATIONS

    NAND LAL PUBLICATION|Exercise ACTIVITY 1.3|2 Videos

  • CARBON AND ITS COMPOUNDS

    NAND LAL PUBLICATION|Exercise ADDITIONAL QUESTIONS|3 Videos

  • METALS AND NON-METALS

    NAND LAL PUBLICATION|Exercise ACTIVITY 3.8|3 Videos

Similar Questions

Explore conceptually related problems

A small amount of quick lime is taken in a beaker. Water is add slowly to beaker. What is the observation wre noted?

Speak loudly for a while or sing a song or buzz like a bee. Put your hand on your throat as shown in Fig. Do you feel any vibrations?

Three beakers labelles as A, B and C each containing 25 mL of water were taken. A small amount of NaOH, anhydrous CuSO_4 and NaCl were added to the breakers A, B and C respectively. It was observed that there was an increase in the temperature of the solutions containers in beaker A, and B, where in case of beaker C, the temperature of the solution falls. Which one of the following statements(s) is(are) correct? (i) In beaker A and B, exothermic process has occured. (ii)In beaker A and B, endothermic process has occured. (iii) In beaker C exothermic process as occured. (iv) In beaker C endothermic process has occured.

• Take about 2 g lead nitrate powder in a boiling tube. • Hold the boiling tube with a pair of tongs and heat it over a flame, as shown in Fig. What do you observe ? Note down the change, if any.

Take two glasses/beakers filled with water. Put a drop of blue or red ink slowly and carefully by the sides of the first beaker and honey in the same way in the second beaker. Leave them undisturbed in your home or in a corner in the class. Record your observations. What do you observe immediately after adding the ink drop ?

Take two glasses/beakers filled with water. Put a drop of blue or red ink slowly and carefully by the sides of the first beaker and honey in the same way in the second beaker. Leave them undisturbed in your home or in a corner in the class. Record your observations. What do you observe immediately after adding a drop of honey?

• Take a few zinc granules in a conical flask or a test tube. • Add dilute hydrochloric acid or sulphuric acid to fig. CAUTION : Handle the acid with care. Touch the conical flask or test tube. Is there change in its temperature ?

Take a dry test tube and put a small amount of water in it. Place a stop cork on the mouth of it. Now suspend the test tube horizontally by two strings or wires as shown in the figure. Heat the test tube with a burner until water vapourises and the cork blows out. How will you calculate the velocity of the cork ?

Fill water in a beaker or a glass up to its brim. Gently touch the water surface with one of the prongs of the vibrating tuning fork as shown in Fig. 12.2. Now dip the prongs of vibrating tuning fork in water as shown in Fig. 12.3 Observe what happens in both the cases?

Fill water in a beaker or a glass up to its brim. Gently touch the water surface with one of the prongs of the vibrating tuning fork as shown in Fig. 12.2. Now dip the prongs of vibrating tuning fork in water as shown in Fig. 12.3 Discuss with your friends why this happens.

Home
Profile