Balance the following skeleton reaction and identify the oxidizing and reducing agents: include the states of all reactants and products in your balanced equation. you do not need to include the states with the identities of the oxidizing and reducing agents. zn(s) + no3−(aq) → zn(oh)42−(aq) + nh3(g) [basic]

-) Oxidizing agent:

-) Reducing agent:

Explanation:

The first step is separate the reaction into the semireactions:

A.

B.

If we want to balance in basic medium we have to follow the rules:

1. We adjust the oxygen with

2. We adjust the H with

3. We adjust the charge with

Lets balance the first semireaction A. :

Now, lets balance semireaction B:

Finally, we have to add the two semireactions:

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Cancel out the species on both sides:

Simplifying the equation :

The is oxidized therefefore is the reducing agent. The is reduced therefore is the oxidizing agent.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

if the temperature drops and becomes cool

then the atmosphere can be freezing as the water vapor in the air is at maximum (100%) and can be severely cold

also can be snowing lightly as the moisture in the air will start to solidify

and btw this is not chemistry but