Enthalpy Changes Quiz

What is the standard temperature often used in enthalpy changes?

• 273 K

• 298 K

• 310 K

• 250 K

What is the standard enthalpy change of combustion?

• The enthalpy change when one mole of a compound is formed

• The enthalpy change when one mole of a substance reacts with oxygen

• The enthalpy change when one mole of gaseous ions is dissolved

• The enthalpy change when one mole of a substance is vaporized

What is the standard enthalpy change of formation?

• The enthalpy change when one mole of a compound is formed

• The enthalpy change when one mole of a substance reacts with oxygen

• The enthalpy change when one mole of gaseous ions is dissolved

• The enthalpy change when one mole of a substance is vaporized

What is the enthalpy change of formation for elements?

• Always positive

• Always negative

• Defined as zero

• Undefined

What is the temperature in Kelvin for 0°C?

• 0 K

• 273.15 K

• 298 K

• 100 K

What is the standard enthalpy change of hydration always considered?

• Positive

• Negative

• Zero

• Undefined

What is the standard enthalpy change of combustion always considered?

• Positive

• Negative

• Zero

• Undefined

What is the effect of increased charge on cations regarding hydration energy?

• Produces more attraction

• Produces less attraction

• No effect

• Produces repulsion

Which ion has the least negative hydration enthalpy among the halides listed?

• I⁻

• Br⁻

• Cl⁻

• F⁻

What happens to the attraction between ion and water molecule as ionic size increases?

• Decreases

• Increases

• Remains the same

• Becomes repulsive