Consider two gases, A and B, are in a container at room temperature. What effect will the following changes have on the rate of the reaction between these gases?
The number of molecules of gas A is doubled.

The answer is B
Because the pressure is double

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.

explanation:

1.solid

2.carbon dioxide

3.helium