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System in Chemistry and First Law of Thermodynamics

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System in Chemistry and First Law of Thermodynamics

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Questions and Answers

What method is suggested in the text to compare the efficiency of different fuels?

Comparing their color when burned

Mixing them with water

Heating a specified volume of water for a set time after burning known amounts (correct)

Burning them in open air

In the context of the text, why is it important for the setup to be ideal when comparing fuel efficiency?

To make the experiment more complicated

To allow for water to escape

To ensure that all energy released by the fuel is absorbed by the water (correct)

To reduce the cost of the experiment

What would make the comparison of different fuels using water heating invalid?

Conducting the experiment in an open system where some water escapes (correct)

Heating water for too long

Using different volumes of water

Adding impurities to the water

Why are chemical reactors mentioned in the text?

To describe closed containers for carrying out reactions in controlled environments Signup and view all the answers

What is meant by 'calcination' in the context of the text?

Heating a substance strongly in air without melting to decompose it Signup and view all the answers

Why is it essential for some reactions to be carried out in closed chemical reactors?

To rearrange atoms in controlled environments without interference Signup and view all the answers

What is a key difference between carrying out reactions in open systems versus closed systems?

'Calcination' can escape into the surroundings in open systems Signup and view all the answers

Why is trapping carbon dioxide produced through decomposition important during reactions?

To prevent the carbon dioxide from escaping and affecting the environment Signup and view all the answers

Which method is suggested in the text to compare the efficiency of different fuels?

Heating a specified volume of water for a set length of time Signup and view all the answers

Why is it important to carry out the fuel efficiency comparison in a closed system?

To ensure the mass of water remains constant Signup and view all the answers

What would happen if the comparison of different fuels using water heating is conducted in an open system?

Some water would escape, rendering the comparison invalid Signup and view all the answers

What characteristic defines a chemical reactor mentioned in the text?

It is a closed container for carrying out reactions Signup and view all the answers

Why is it essential for reactions like the calcination of calcium carbonate to take place in a closed reaction container?

To trap the carbon dioxide produced through decomposition Signup and view all the answers

What is the purpose of heating a specified volume of water when comparing fuel efficiency?

To determine which fuel raised the temperature of the water the most Signup and view all the answers

Why must some reactions be carried out in controlled environments like closed chemical reactors?

For successful rearrangement of atoms under controlled conditions Signup and view all the answers