Chemistry, 05.01.2020 20:31 sipstick971

Asample of gas is in a rigid cylinder with a movable piston. the pressure of the gas is kept constant. if the kelvin temperature of the gas is
doubled, the volume of the gas is
o 1.
2
halved
doubled
tripled
unchanged
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Answer from: lexas7961

The volume will double, if the temperature of the gas is doubled as temperature and volume are directly proportional.

Answer from: deepspy599otchpd

If the Kelvin temperature of the gas is doubled, the volume of the gas is doubled.

Explanation:

To calculate the final volume of the system, we use the equation given by Charles' Law.

This law states that volume of the gas is directly proportional to the temperature of the gas at constant pressure.

Mathematically,

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$ (at constnat pressure)

where,

$V_1\text{ and }T_1$ are the initial volume and temperature of the gas.

$V_2\text{ and }T_2$ are the final volume and temperature of the gas.

We are given:

T_2=2T_1

V_2=?

$\frac{V_1}{T_1}=\frac{V_2}{T_2}$

$\frac{V_1}{T_1}=\frac{V_2}{2T_1}$

V_2=2V_1

If the Kelvin temperature of the gas is doubled, the volume of the gas is doubled.

Answer from: Quest

Answer: abeexplanation:

1. the question asks the most appropriate, which seems to rule out "all of the above." your choice appears to be the correct one.

2. the protocol described is good for identifying correlation, but not cause and effect. for cause/effect, you need to devise a protocol that will assign the treatment (or not) to groups that have essentially the same "demographics" with respect to all the other variables. your choice regarding control group seems appropriate. random assignment of treatment (choice d) may be appropriate also. (i think you can argue that b and d are just different descriptions of the same method.)

3. d will randomize the birds, but may not guarantee there are 10 in each group. e will do both, so seems the better choice.

comment on question 2

based on the problem statement, it seems clear that confident, attentive drivers are more likely to use daytime running lights. so, the protocol might need to be devised in such a way that the lights would be turned on or off without the driver's knowledge. (an attentive driver will figure it out.) assigning a confident, attentive driver to a group required to drive without running lights might mess with his/her confidence and attentiveness. you don't want your experiment to do that. (nor do you want the experiment to subject a driver to greater risk of accident as a consequence of driving without running lights.) experiments involving human safety are always problematic.

Answer from: Quest

1. they vary with a higher number because boiling is way hotter than melting

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