Thermodynamics Quiz

What is a calorimeter used for?

• Measuring temperature

• Measuring heat changes

• Measuring weight

• Measuring volume

What is the main question addressed in the activity?

• Why does the color change when a powder is dissolved in water?

• Why does the temperature change when a powder is dissolved in water?

• Why does the volume change when a powder is dissolved in water?

• Why does the mass change when a powder is dissolved in water?

What happens to the temperature when 20 g of KCl is added to 100 mL of water?

• It rises

• It falls

• It stays the same

• It fluctuates

Which bonds are stronger: the bonds formed or the bonds broken in the KCl solution?

• Bonds formed

• Bonds broken

• Both are equally strong

• Neither are strong

If a solute has strong bonds between its particles, what is likely to happen to the temperature of the solution?

• It will get hot

• It will get cold

• It will stay the same

• It will fluctuate

How do the purple and orange arrows compare for the powder with little temperature change?

• Purple is larger

• Orange is larger

• They are roughly the same size

• They are not visible

Which powder is predicted to produce the coldest solution?

• NaCl

• NaBr

• CaCl₂

• NH₄NO₃

What is the effect of breaking strong solute bonds on the temperature of the solution?

• It releases energy

• It absorbs energy

• It has no effect

• It fluctuates

What relationship is discovered when the amount of powder is increased?

• The greater the amount of powder used, the greater the temperature change

• The greater the amount of powder used, the smaller the temperature change

• The greater the amount of powder used, the temperature remains constant

• The greater the amount of powder used, the temperature decreases

Which powder produced the greatest temperature increase?

• NaCl

• NH4NO3

• CaCl2

• KCl