Explain how alkali metals are different from noble gases.

The answer to your question is given below

Explanation:

1. Alkali metals are simply metals of the group 1 elements, because they 1 valence electron. Noble gas on the other hand are simply the group zero element, because they have zero valence electron.

2. Alkali metals react with water to form alkalis hence they are called alkali metals. Noble gas does not take part in any reaction hence they are referred to as noble gas.

3. Alkali metals have incomplete octet configuration while noble gas has complete octet configuration.

4. Alkali metals are all solid at room temperature, while noble gas are all gases at room temperature

2fe + 3h2so4 -> fe2(so4)3 + 3h2

it is necessary to balance equations in order to get the proper amount of reactants as well as products in order not to make a miscalculation.

you cannot change the subscripts as that would change the substance itself. for instance, diatomic elements such as h2 only have the subscript two when a gas. another example would be so4, if you were to change the subscript, the element would no longer be sulfate.

we change the coefficients instead as that only changes the number of molecules rather than the substance itself.

hope this !

the answer would be a