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pychu [463]
3 years ago
9

Explain how you could experimentally determine whether the outiside temperature is higer or lower than 0 degree centigrade(32f)

without using a thermometer.
Chemistry
1 answer:
umka2103 [35]3 years ago
5 0

Explanation:

An experiment to determine whether the outside temperature is higher or lower than 0 degree centigrade (32f) without using a thermometer is as follows.

Take two glasses and there has to be a frozen water in glass 1 and normal water in glass 2.

Now, place both these glasses in the outside environment.

If ice in glass 1 melts but level of water in glass 2 remains the same then it means that temperature outside is greater than zero degree centigrade.

Whereas if ice in glass 1 remains frozen and water in glass 2 also freezes then it means temperature outside is either zero degree centigrade or less than zero degree centigrade.

         

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Hydrogen reacts with chlorine to form hydrogen chloride (HCl (g), mc012-1.jpgHf = –92.3 kJ/mol) according to the reaction below.
Kobotan [32]

<u>Given:</u>

H2(g) + Cl2 (g) → 2HCl (g)

<u>To determine:</u>

The enthalpy of the reaction and whether it is endo or exothermic

<u>Explanation:</u>

Enthalpy of a reaction is given by the difference between the enthalpy of formation of reactants and products

ΔH = ∑nHf (products) - ∑nHf (reactants)

      = [2Hf(HCl)] - [Hf(H2) + Hf(Cl2)] = 2 (-92.3) kJ = - 184.6 kJ

Since the reaction enthalpy is negative, the reaction is exothermic

<u>Ans:</u> The enthalpy of reaction is -184. kJ and the reaction is exothermic

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Answer:

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Apparatus arranged to measure the volume of gas in a reaction. Reaction mixture is in a flask and gas travels out through a pipe in the top and down into a trough of water. It then bubbles up through a beehive shelf into an upturned glass jar filled with water. The gas collects at the top of the jar, forcing water out into the trough below.

To make oxygen in the laboratory, hydrogen peroxide is poured into a conical flask containing some manganese(IV) oxide. The gas produced is collected in an upside-down gas jar filled with water. As the oxygen collects in the top of the gas jar, it pushes the water out.

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