11. when does raising the temperature of a gas increase its pressure?
when volume is increased and the number of particles is constant
when volume and the number of particles are constant
when volume is increased and the number of particles is increased

B. when volume and the number of particles are constant

Explanation:

According to Gay Lussac law,

For a given amount of gas at constant volume (V) and the number of particles are constant (n)

Pressure is directly proportional to the temperature of the gas.

It is given by the expression  

( at constant V and n)

(k is a constant )

When there is a change in the pressure or temperature

The expression is

Where                                

and are initial pressure and final pressure respectively

and are initial and final temperatures respectivley

Please Note:

Directly proportional means when one increases the other one too will increase that is when pressure increases temperature too will increases if volume and number of particles are constant.

sry but any answer choices

answer : one can design an experiment using a liquid and an additive that can be added to the liquid and observe the chemical changes in the reaction species.

one would need a beaker which is filled with a known amount of the liquid in which thermometer is placed to measure the temperature changes; after addition of the additive to the liquid solution one can note down the temperature change and find whether the reaction is endothermic or exothermic in nature. by subtracting the initial temperature value with the final temperature one can find the temperature changes.

various combinations of liquid and additive can be used. liquid in this case can be a known quantity of water and additives can be epsom salt or without epsom salt the experiment can be conducted to notice the changes. water and ice, hydrogen peroxide and dry yeast, vinegar and baking soda,etc.