Entropy

Entropy

By Kaye Pickett

Multiple Choice

Entropy is a measure of

• accuracy

• precision

• the disorder of a system

• the attraction of a nucleus for an electron

Multiple Choice

Which of these processes represents a decrease in entropy?

• sublimation of CO₂

• boiling water

• condensation of steam on cold glass

• NaCl dissolving in water

Multiple Choice

Which of these reactions shows a DECREASE in entropy?

• CaCO₃(s) → CaO(s) + CO₂(g)

• 3O₂(g) → 2O₃(g)

• 2NH₃(g) → 3H₂(g) + N₂(g)

• C₆H₆(l) → C₆H₆(g)

Multiple Choice

The entropy will usually increase when

• a molecule is broken into two or more smaller molecules

• a reaction occurs that results in an increase in the number of moles of gas

• a solid changes to a liquid

• all of these

Multiple Choice

Which sample has the lowest entropy?

• 1 mole of KNO₃(l)

• 1 mole of KNO₃(s)

• 1 mole of H₂O(l)

• 1 mole of H₂O(g)

Multiple Choice

Entropy increases from solid, liquid to gas. Why?

• Molecular disorder increases

• Molecules increase in number from solid to gas

• Molecules are heavier in solid

• Molecules are more reactive

Multiple Choice

Which phase change represents a decrease in entropy?

• solid to liquid

• gas to liquid

• liquid to gas

• solid to gas

Multiple Choice

What phase of matter has the most entropy?

• solid

• liquid

• gas

Multiple Choice

If Ice melts, its entropy increases.

• Trulala

• Falsemama

• It will not change. So... none of the above.

Multiple Choice

Which of these reactions shows a DECREASE in entropy?

• CaCO₃(s) → CaO(s) + CO₂(g)

• 3O₂(g) → 2O₃(g)

• 2NH₃(g) → 3H₂(g) + N₂(g)

• C₆H₆(l) → C₆H₆(g)

Multiple Choice

What is a spontaneous process ?

• slow process

• fast process

• process that needs an external intervention to occur

• process that does not need external intervention to occur / keep happening