section: behavior of gases
describing gas behavior
______ 1. what state of matter is helium?
a. solid c. gas
b. liquid d. plasma
2. a measure of how fast the particles in an object are moving
is the ____________________.
3. why is more gas needed to fill helium balloons on a cold day?
_________________________________________________________
_________________________________________________________
_________________________________________________________
4. the amount of space that an object takes up is the ____________________.
5. the volume of any gas depends upon the size of
the ____________________.
6. the amount of force exerted on a given area is
called ____________________.
7. why does the basketball have greater pressure than the beachball?
_________________________________________________________
_________________________________________________________
_________________________________________________________
_________________________________________________________
gas behavior laws
______ 8. lifting a piston on a cylinder of gas shows that when the pressure of
the gas
a. increases, the temperature increases.
b. decreases, the volume increases.
c. decreases, the volume decreases.
d. increases, the volume increases.

Question

section: behavior of gases
describing gas behavior
______ 1. what state of matter is helium?
    a. solid        c. gas
    b. liquid       d. plasma
2. a measure of how fast the particles in an object are moving
   is the ____________________.
3. why is more gas needed to fill helium balloons on a cold day?
   _________________________________________________________
   _________________________________________________________
   _________________________________________________________
4. the amount of space that an object takes up is the ____________________.
5. the volume of any gas depends upon the size of
   the ____________________.
6. the amount of force exerted on a given area is
   called ____________________.
7. why does the basketball have greater pressure than the beachball?
   _________________________________________________________
   _________________________________________________________
   _________________________________________________________
   _________________________________________________________
gas behavior laws
______ 8. lifting a piston on a cylinder of gas shows that when the pressure of
    the gas
    a. increases, the temperature increases.
    b. decreases, the volume increases.
    c. decreases, the volume decreases.
    d. increases, the volume increases.

Accepted Answer

### Question 1
# Brief Explanations:
Helium is a noble gas, so its state of matter at standard conditions is gas. Option a is solid (has fixed shape/volume), b is liquid (fixed volume, no fixed shape), d is plasma (ionized gas, not helium's normal state). So the correct option is c.
# Answer:
c. gas

### Question 2
# Brief Explanations:
The measure of how fast particles in an object move is temperature (specifically, kinetic energy related to temperature). Temperature reflects the average kinetic energy of particles.
# Answer:
temperature

### Question 3
# Brief Explanations:
On cold days, temperature is low. According to gas laws (like Charles's Law, $ V \propto T $ at constant pressure), lower temperature means lower volume of gas at the same pressure. To fill the balloon to the same size (volume), more gas (moles) is needed because the gas contracts (lower volume per amount) in cold. Also, from ideal gas law $ PV = nRT $, at constant $ P $ and $ V $ (balloon size), lower $ T $ requires higher $ n $ (amount of gas) to maintain pressure.
# Answer:
On a cold day, gas particles have less kinetic energy and move slower, so the gas occupies less volume at the same pressure. To fill the balloon to the desired size (volume), more gas is needed because the gas contracts (has a smaller volume per unit amount) due to lower temperature (based on gas laws like Charles’s Law or the ideal gas law $ PV = nRT $, lower $ T $ at constant $ P $ and $ V $ requires more moles $ n $ of gas).

### Question 4
# Brief Explanations:
The amount of space an object takes up is defined as volume. It's a fundamental physical property describing the three - dimensional space occupied.
# Answer:
volume

### Question 5
# Brief Explanations:
For a gas, the volume depends on the size of the container (or the space it is allowed to occupy). Gases expand to fill their containers, so the volume of a gas is determined by the container's volume (assuming it's in a container; otherwise, it would expand infinitely, but in practical terms, the space it occupies is the "container" size).
# Answer:
container (or the space it occupies)

### Question 6
# Brief Explanations:
Pressure is defined as the force exerted per unit area. The formula is $ P=\frac{F}{A} $, where $ P $ is pressure, $ F $ is force, and $ A $ is area.
# Answer:
pressure

### Question 7
# Brief Explanations:
A basketball has a smaller volume than a beachball (usually). For a given amount of gas (or similar amount, but basketball is more rigid), the volume $ V $ is smaller. From the ideal gas law $ PV = nRT $, if $ n $ (amount of gas), $ R $ (gas constant), and $ T $ (temperature) are similar, a smaller $ V $ leads to a larger $ P $ (since $ P=\frac{nRT}{V} $). Also, the basketball has more gas particles per unit volume (higher density of gas particles), so more frequent collisions with the inside surface, leading to higher pressure.
# Answer:
A basketball has a smaller volume than a beachball (for a similar amount of gas or when inflated to a firm state). According to the ideal gas law $ PV = nRT $, if the amount of gas ($ n $), temperature ($ T $), and gas constant ($ R $) are relatively constant, a smaller volume ($ V $) results in a greater pressure ($ P $) (since $ P=\frac{nRT}{V} $). Also, the basketball has more gas particles per unit volume, so there are more frequent collisions of gas particles with the inner surface of the ball, exerting a greater force per unit area (pressure).

### Question 8
# Brief Explanations:
Lifting a piston on a cylinder of gas increases the volume available to the gas. According to Boyle's Law ($ P \propto \frac{1}{V} $ at constant temperature), when volume increases, pressure decreases. So when the piston is lifted (volume increases), pressure of the gas decreases. So option b: when pressure decreases, volume increases (lifting piston increases volume, so pressure decreases as volume increases). Option a is about pressure - temperature (not related to piston lifting volume change). Option c is incorrect (decreasing pressure should increase volume, not decrease). Option d is incorrect (increasing pressure would decrease volume, not increase).
# Answer:
b. decreases, the volume increases

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