Q2 of 10 Page 142

Lighted candles of different heights are arranged in a trough as shown in the figure. Pour a

saturated solution of sodium bicarbonate (baking soda) into the trough. Add a little vinegar to the solution. What do you observe? Give reasons for the observation.


When we add little vinegar to sodium bicarbonate (baking soda) then CO2 gas will evolve due to presence of carboxylic acid in vinegar because when acids react with bicarbonates then CO2 gas evolves. And this CO2 gas will put out the candles. Small candle will be put out first and large candle will be put out at last.

NaHCO3 + CH3COOH CH3COONa + H2O + CO2


More from this chapter

All 10 →
5

Given below are the chemical formulae of some hydrocarbons

C3H6, C2H6, C3H4


a) Represent their structure


b) Based on their structure, classify them into alkane, alkene and alkyne.

 1

Arrange the objects as shown in the figure and conduct the experiment. Based on your observations, what is the conclusion that you reach at?

 3

Making a fire extinguisher.

Arrange the apparatus as shown in Figure (a). Add the vinegar contained in the test tube to the sodium bicarbonate (baking soda) solution (Figure (b)) by tilting the wash bottle. Introduce the resultant gas to a candle flame. Record your observation. What is your inference?


 4

Construct and display the ball and stick models of some hydrocarbons.