states of matter

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Questions and Answers

What is an endothermic process?

A process that releases heat to its surroundings
A process that has no effect on the surroundings
A process that absorbs heat from its surroundings (correct)
A process that only occurs in chemical reactions

In an endothermic process, what happens to the temperature of the system and the surroundings?

The temperature of the system and surroundings both decrease
The temperature of the system increases and that of the surroundings decreases (correct)
The temperature of the system decreases and that of the surroundings increases
The temperature of the system and surroundings both increase

Who coined the term 'endothermic'?

Louis Pasteur
Marcellin Berthelot (correct)
Joseph Louis Gay-Lussac
Antoine Lavoisier

What does the term 'endothermic' mean in Greek?

Within hot or warm (C) Signup and view all the answers

Which of the following is an example of an endothermic process?

Melting of ice cubes (B) Signup and view all the answers

What is dissolving pulp?

Dissolving pulp is bleached wood pulp or cotton linters with a high cellulose content (> 90%), manufactured for uses requiring high chemical purity and low hemicellulose content. Signup and view all the answers

What are the special properties of dissolving pulp?

Dissolving pulp has special properties including a high level of brightness and uniform molecular-weight distribution. Signup and view all the answers

Why is it called 'dissolving pulp'?

It is called 'dissolving pulp' because it is not made into paper, but dissolved either in a solvent or by derivatization into a homogeneous solution, making it completely chemically accessible and removing any remaining fibrous structure. Signup and view all the answers

What are the uses of dissolved dissolving pulp?

Once dissolved, it can be spun into textile fibers (viscose or Lyocell), or chemically reacted to produce derivatized celluloses, such as cellulose triacetate or cellulose ethers like methyl cellulose. Signup and view all the answers

Why is low hemicellulose content important in dissolving pulp?

Low hemicellulose content is important in dissolving pulp because the chemically similar hemicellulose can interfere with subsequent processes. Signup and view all the answers