1. what is the oxidizing agent in the following reaction? ch4 + 2o2 --> co2 + h2o

Oxygen gas (O₂)

Explanation:

Oxidizing agent is one which its self gets reduced and oxidizes the other.

Oxidation is the process where the oxidation number of substance increases while in reduction the oxidation number decreases.

The oxidation number of hydrogen in both methane and water is "+1"

Oxidation number of carbon in methane is "-4"

While its oxidation number in carbondioxide is "+4"

Thus carbon is undergoing oxidation.

While the change in oxidation number of oxygen from O₂ to CO₂ is "0" to -2

Hence it is undergoing reduction and oxidizing carbon.

answer: the rate of diffusion increases with increase in temperature.

increase in temperature, increases the molecular/particles speed (kinetic energy. diffusion means movement of particles through the material.

generally, the heavier the particle the more it interacts with the environment and more the temperature matters. so higher temperature results in higher diffusion.

the correct option is c.

isotopes refers to different forms of the same element with the same atomic number but different mass number as a result of difference in their neutron numbers. isotopes have different relative atomic mass but share the same chemical properties.