Question

1. when a gas undergoes an isothermal process, which property remains constant throughout the entire process?

mark only one oval.
density
volume
temperature
pressure

1. a student observes that when they squeeze a balloon, its volume decreases but it feels warmer. what can they conclude about the relationship between pressure, volume, and temperature?

mark only one oval.
density decreases when pressure increases
temperature increases when volume decreases at constant mass
specific heat determines the temperature change
pressure and volume are directly proportional

1. during an isobaric process, a gas expands from 2 m³ to 4 m³. what happens to the gass density?

mark only one oval.
it increases by 25%
it decreases by half
it doubles
it remains constant

Explanation:

• Question 10: In an isothermal process, the prefix "iso -" means "same", and "thermal" relates to temperature. So the temperature remains constant.
• Question 11: When the volume of the balloon (with constant mass of gas inside) decreases (squeezing), it feels warmer (temperature increases). According to the ideal gas law \(PV = nRT\) (where \(n\) is moles of gas, \(R\) is the gas constant), at constant mass (\(n\) is constant), when \(V\) decreases and \(T\) increases.
• Question 12: Density \(

ho=\frac{m}{V}\). In an isobaric (constant pressure) process, if \(V\) changes from \(V_1 = 2m^{3}\) to \(V_2=4m^{3}\), and mass \(m\) is constant (assuming no gas added or removed). Using the density formula \(
ho_1=\frac{m}{V_1}\) and \(
ho_2=\frac{m}{V_2}\). Substituting \(V_2 = 2V_1\), we get \(
ho_2=\frac{1}{2}
ho_1\)

Answer:

1. C. Temperature
2. B. Temperature increases when volume decreases at constant mass
3. B. It decreases by half