Temperature also affects the motion of atoms in a gas. Given what you know about temperature, pressure, and volume, which statement is NOT correct?
Responses
A As a gas is heated, the volume increases.As a gas is heated, the volume increases.
B As a gas is heated, the pressure increases.As a gas is heated, the pressure increases.
C As a gas is heated, the pressure decreases.As a gas is heated, the pressure decreases.
D As a gas is heated, energy increases and molecules spread out.
C As a gas is heated, the pressure decreases.
The statement that is NOT correct is C: As a gas is heated, the pressure decreases.
To determine which statement is NOT correct, we need to understand the relationship between temperature, pressure, and volume in a gas.
According to the ideal gas law, the relationship between temperature (T), pressure (P), and volume (V) is given by the equation:
PV = nRT
where:
- P is the pressure of the gas
- V is the volume of the gas
- n is the number of moles of gas
- R is the ideal gas constant (a constant value)
- T is the temperature in Kelvin
Let's analyze each statement:
A) As a gas is heated, the volume increases.
This statement is generally correct. According to Charles's Law, at constant pressure, the volume of a gas is directly proportional to its temperature. So, as the gas is heated, the volume tends to increase.
B) As a gas is heated, the pressure increases.
This statement is generally correct. According to Gay-Lussac's Law, at constant volume, the pressure of a gas is directly proportional to its temperature. So, as the gas is heated, the pressure tends to increase.
C) As a gas is heated, the pressure decreases.
This statement is NOT correct. As mentioned in statement B, the pressure of a gas increases with increasing temperature. So, as the gas is heated, the pressure generally tends to increase, not decrease.
D) As a gas is heated, energy increases and molecules spread out.
This statement is correct. When a gas is heated, its energy increases, and the average kinetic energy of the gas molecules increases too. This causes the gas molecules to move faster and spread out.
Based on our analysis, the statement that is NOT correct is C) As a gas is heated, the pressure decreases.