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ser-zykov [4K]
3 years ago
7

Which of the following would indicate that a chemical change might be occurring?

Chemistry
2 answers:
vitfil [10]3 years ago
4 0
D. Is the best indicator for a chemical change.
kari74 [83]3 years ago
3 0

Answer:

Two solutions are mixed, and a solid begins to appear

Explanation:

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The Ksp of yttrium iodate, Y(IO3)3 , is 1.12×10−10 . Calculate the molar solubility, s , of this compound.
torisob [31]

Answer:

1.427x10^-3mol per L

Explanation:

Y(IO_{3} )_{3} ---- Y^{3+} +IO_{3} ^{3-}

I could use ⇌ in the math editor so I used ----

from the question each mole of Y(IO3)3 is dissolved  and this is giving us a mole of Y3+ and a mole of IO3^3-

Ksp = [Y^3+][IO3-]^3

So that,

1.12x10^-10 = [S][3S]^3

such that

1.12x10^-10 = 27S^4

the value of s is 0.001427mol per L

= 1.427x10^-3mol per L

so in conclusion

the molar solubility is therefore 1.427x10^-3mol per L

3 0
3 years ago
Consider a simple reaction in which a reactant AA forms products: A→productsA→products What is the rate law if the reaction is z
levacccp [35]

Answer :

The rate law expression for zero order reaction will be:

Rate=k[A]^0

The rate law expression for first order reaction will be:

Rate=k[A]^1

The rate law expression for second order reaction will be:

Rate=k[A]^2

Zero order reaction : There is no affect on the rate law.

First order reaction : The rate law becomes doubled.

Second order reaction : The rate law becomes quadrupled.

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.

The given reaction is:

A\rightarrow Products

The rate law expression for zero order reaction will be:

Rate=k[A]^0

The rate law expression for first order reaction will be:

Rate=k[A]^1

The rate law expression for second order reaction will be:

Rate=k[A]^2

Now we have to determine that if doubling of the concentration of A then the rate of reaction will be:

As we know that the zero order reaction does not depend on the concentration of reactant. So, there is no affect on the rate law.

As we know that the first order reaction depend on the concentration of reactant. So, the rate law becomes doubled.

As we know that the second order reaction depend on the concentration of reactant. So, the rate law becomes quadrupled.

5 0
4 years ago
If all data points lie in a straight line on your standard curve except for one point. Should you ignore the point or shift the
Ivanshal [37]
Ignore the point, the majority of the points are along the trend line.
3 0
3 years ago
Read 2 more answers
How many milliliters of a 0.640 M solution of KBr would be required to contain 17.2 grams of KBr
mamaluj [8]

Answer:

227 mL KBr

Explanation:

To find the amount of milliliters KBr, you need to (1) convert grams to moles (via molar mass from values on periodic table), then (2) find the amount of liters KBr (via molarity equation using molarity and moles), and then (3) convert liters to milliliters. The final answer should have 3 sig figs to match the amount of sig figs in the given values.

<u>(Step 1)</u>

Molar Mass (KBr): 39.098 g/mol + 79.904 g/mol

Molar Mass (KBr): 119.002 g/mol

17.2 grams KBr            1 mole
-----------------------  x  ------------------  =  0.145 moles KBr
                                  119.002 g

<u>(Step 2)</u>

Molarity (M) = moles / volume (L)

0.640 M = 0.145 moles / volume

(0.640 M) x (volume) = 0.145 moles

volume = (0.145 moles) / (0.640 M)

volume = 0.227 L

<u></u>

<u>(Step 3)</u>

<u></u>

0.227 L KBr         1,000 mL
------------------  x  -----------------  = 227 mL KBr
                                1 L

3 0
2 years ago
One mechanism for the destruction of ozone in the upper atmosphere is
UNO [17]

Answer:

When chlorine and bromine atoms come into contact with ozone in the stratosphere, they destroy ozone molecules.

Explanation:

6 0
3 years ago
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