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3 years ago

Is granite rock a compound, element, mixture? Explain

Chemistry

1 answer:

Ghella [55]3 years ago

7 0

It is a mixture of minerals mainly of corps that crystalizes of magma below earths surface.

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Which types of reactions are also redox reactions?

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Answer:

i think it is a

Explanation:

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3 years ago

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What is the percent yield.

babunello [35]

The amount of product obtained in a chemical reaction. The absolute yield can be given as the weight in grams or in moles.

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3 years ago

Consider the overall reaction: 2 X2Y + Z2 ⇌ 2 X2YZ which has an experimentally determined rate law of: rate= k[X2Y][Z2]. Which o

enyata [817]

Answer : The correct possible mechanisms for the reaction is:

Step 1 : $X_2Y+Z_2\rightarrow X_2YZ_2$ (slow)

Step 2 : $X_2YZ_2+X_2Y\rightarrow 2X_2YZ$ (fast)

Explanation :

Rate law : It is defined as the expression which expresses the rate of the reaction in terms of molar concentration of the reactants with each term raised to the power their stoichiometric coefficient of that reactant in the balanced chemical equation.

As we are given the overall reaction,

$2X_2Y+Z_2\rightarrow 2X_2YZ$

The given expression of rate law for this reaction is,

$Rate=k[X_2Y][Z_2]$

Now we have to determine the possible mechanisms for the reaction.

The rate law expression for overall reaction should be in terms of $X_2Y$ and $Z_2$ .

As we know that the slow step is the rate determining step.

Option 1 :

Step 1 : $2X_2Y+Z_2\rightarrow 2X_2YZ$ (slow)

The expression of rate law for this reaction will be,

$Rate=k[X_2Y]^2[Z_2]$

Option 2 :

Step 1 : $X_2Y+Z_2\rightarrow X_2YZ+Z$ (fast)

Step 2 : $X_2Y+Z\rightarrow X_2YZ$ (slow)

The rate law from the slow step 2 is,

$Rate=K'[X_2Y][Z]$ .............(1)

Now applying steady state approximation for $Z$ , we get:

$\frac{d[Z]}{dt}=K"[X_2Y][Z_2]$ .........(2)

Now put equation 2 in 1, we get:

$Rate=K'K"[X_2Y]^2[Z_2]$

$K'K"=K$

The rate law expression will be:

$Rate=K[X_2Y]^2[Z_2]$

Option 3 :

Step 1 : $X_2Y+Z_2\rightarrow X_2YZ_2$ (slow)

Step 2 : $X_2YZ_2+X_2Y\rightarrow 2X_2YZ$ (fast)

The expression of rate law for this reaction will be,

$Rate=k[X_2Y][Z_2]$

Option 4 :

Step 1 : $2X_2Y\rightarrow X_4Y_2$ (fast)

Step 2 : $X_4Y_2+Z_2\rightarrow 2X_2YZ$ (slow)

The rate law from the slow step 2 is,

$Rate=K'[X_4Y_2][Z_2]$ .............(1)

Now applying steady state approximation for $X_4Y_2$ , we get:

$\frac{d[X_4Y_2]}{dt}=K"[X_2Y]^2$ .........(2)

Now put equation 2 in 1, we get:

$Rate=K'K"[X_2Y]^2[Z_2]$

$K'K"=K$

The rate law expression will be:

$Rate=K[X_2Y]^2[Z_2]$

Option 5 :

Step 1 : $Z_2\rightarrow Z+Z$ (slow)

Step 2 : $X_2Y+Z\rightarrow X_2YZ$ (fast)

Step 3 : $X_2Y+Z\rightarrow X_2YZ$ (fast)

The rate law expression will be:

$Rate=K[Z_2]$

From the given options we conclude that the only option 3 is the correct possible mechanisms for the given reaction.

Hence, the correct possible mechanisms for the reaction is:

Step 1 : $X_2Y+Z_2\rightarrow X_2YZ_2$ (slow)

Step 2 : $X_2YZ_2+X_2Y\rightarrow 2X_2YZ$ (fast)

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3 years ago

How does nickel make stainless steel not magnetic?.

9966 [12]

The nickel, itself ferromagnetic, reduces the magnetism in stainless steel but not to zero. Austenitic stainless steel is defined as the steel crystal structure that is face centered cubic which is the same structure hot iron has as one of the allotropes of iron. Nickel above a certain percentage (18) stabilizes austenite structure just as if you took carbon steel and heated it above 730–770 C. Above this temperature the structure is FCC and above the Currie temperature where magnetism is killed due to the isotopic symmetry of the structure. However, you can still get a small magnetic attraction from austenitic stainless steel if it is cold worked, heat treated a certain way or welded. So it is not a guarantee that austenitic stainless is totally non magnetic.

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3 years ago

I need help with this gizmos

Rasek [7]

What are gizmos explain and I will help you

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3 years ago