What happens to a gas that is enclosed in a rigid container when the temperature of the gas is increased?
a. the gas particles move faster and collide more frequently, which causes an increase in pressure.
b. the gas particles move slower and repel one another, which causes a decrease in pressure.
c. the gas particles expand and take up more space, which causes an increase in pressure.
d. the gas particles become smaller and take up less space, which causes a decrease in pressure.

in 1783 cavendish was working with his hydrogen gas and found that when he burned it and condensed the vapor it was water. this was very significant since it disproved the greek theory of elements completely since water was not a simple substance but the product of two gases. it was lavoisier who hearing of the experiment gave cavendish's gas the name hydrogen ("water-producer") and added that hydrogen burned by combining with oxygen and that water was a hydrogen-oxygen combination.

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