What tells about the subject, does or did, is or was? *

1)a

2 b

3 d

4 d or b

explanation:

no se

explanation:

no se

the gas pressure p, gas volume v, and gas temperature t are given in the formula:   pv=nrt,

r is the gas constant, and n is the number of gas moles.

if the container is cooled and remains under atmospheric pressure, where r is a constant that does not change, the volume of the container remains the same, the conclusion is drawn that, with all other values ​​unchanged, the number of gas moles n, is decreases.

the right answer is a.

the correct definition of purity is like something being pure.

ex. the girl was so pure(ity) she was so sweet and gentle, that she couldn't even hurt a fly.

ex. the man had so mch purity he didn't even know how to curse.