Ne(g) effuses at a rate that is times that of br2(g) under the same conditions.

Answer : The Ne(g) effuses at a rate that is 2.828 times that of under the same conditions.

Solution : Given,

Molar mass of neon = 20 g/mole

Molar mass of bromine = 160 g/mole

Rate of diffusion : It is defined as the rate of diffusion is inversely proportional to the square root of the molar mass of the gas.

Formula used :

where,

= Rate of diffusion of neon gas

= Rate of diffusion of bromine gas

= Molar mass of neon gas

= Molar mass of bromine gas

Now put all the given values in this formula, we get

Therefore, the Ne(g) effuses at a rate that is 2.828 times that of under the same conditions.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.