Question

19 elección múltiple 1 punto a student notices that increasing the temperature causes an increase in pressure. which of the following conclusions explains this observation? increasing temperature increases the number of gas particles in the sample and results in a greater number of collisions increasing temperature results in faster moving particles and more frequent and forceful collisions increasing temperature results in the size of the container increasing and fewer collisions among the particles increasing temperature causes particles to get larger resulting in a greater number of collisions 20 respuestas múltiples 1 punto which phase(s) of matter has variable shape? solid gas liquid

Explanation:

Step1: Recall kinetic - molecular theory

According to the kinetic - molecular theory of gases, pressure is caused by the collisions of gas particles with the walls of the container.

Step2: Analyze the effect of temperature on particles

When the temperature of a gas is increased, the average kinetic energy of the gas particles increases. This results in the particles moving faster. Faster - moving particles collide more frequently and with greater force against the walls of the container, leading to an increase in pressure.

Step3: Evaluate each option

• Option 1: The number of gas particles in a closed - system sample does not increase with temperature (assuming no chemical reactions or addition of more gas), so this is incorrect.
• Option 2: This is correct as explained above.
• Option 3: Increasing temperature does not necessarily cause the size of the container to increase (in a rigid container, the volume is constant), and more collisions occur with increased temperature, not fewer. So this is incorrect.
• Option 4: Temperature increase does not cause particles to get larger; it affects their kinetic energy and motion. So this is incorrect.

For question 20:

• A solid has a fixed shape.
• A gas takes the shape of its container (variable shape) because its particles are free to move around.
• A liquid also takes the shape of the part of the container it fills (variable shape) as its particles can slide past one another.

Answer:

1. Increasing temperature results in faster moving particles and more frequent and forceful collisions.
2. Gas

Liquid