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3 years ago

Please i need the answer for 18,19,20Answer and I will give you brainiliest

Chemistry

1 answer:

dezoksy [38]3 years ago

8 0

Number 18 is correct, number 19 is the particles speed up and the substance expands, and number 20 is decrease in volume

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The value of ksp for cui is 1 × 10−12. what is the solubility for cui?

JulijaS [17]

The solubility for CUi is calculated as follows
write the equation for dissociation of CUi

that is CUI ----> CU + + i -

Ksp= (Cu+) (I-)

let the concentration of CU+ be represented by x and also that of I- be represented by also x

Ksp is therefore= X2

x2 = 1x10^-12
find the square root x is therefore = 1 x10^-6

by use of mole ratio the solubity of CUi is therefore = 1 x10 ^-6

5 0

3 years ago

Convection currents are caused by...

eimsori [14]

Answer:

Explanation:

that should be the answer

7 0

3 years ago

If you obtain 3.0 grams of aspirin from an experiment that could make no more than 3.14 grams, what is the percent yield?

Masteriza [31]

Answer:

96%

Explanation:

To find the percent yield, we can use this equation

$\frac{Actual}{Theoretical} *100$

The actual yield of aspirin is 3.0 and the theoretical is 3.14 in this case, so just plug the numbers in.

$\frac{3.0}{3.14} *100\\\\ =96$

Thus the percent yield is 96%

;)

3 0

3 years ago

What isotope has a mass number of 18 and an atomic number of 7

adell [148]

Answer:

nitrogen 18

nitrogen has an atomic number of 7

4 0

4 years ago

The tabulated data were collected for this reaction:

erastovalidia [21]

Answer:

ai) Rate law, $Rate = k [CH_3 Cl] [Cl_2]^{0.5}$

aii) Rate constant, k = 1.25

b) Overall order of reaction = 1.5

Explanation:

Equation of Reaction:

$CH_{3} Cl (g) + 3 Cl_2 (g) \rightarrow CCl_4 (g) + 3 HCl (g)$

If $A + B \rightarrow C + D$ , the rate of backward reaction is given by:

$Rate = k [A]^{a} [B]^{b}\\k = \frac{Rate}{ [A]^{a} [B]^{b}}\\k = \frac{Rate}{ [CH_3 Cl]^{a} [Cl_2]^{b}}$

k is constant for all the stages

Using the information provided in lines 1 and 2 of the table:

$0.014 / [0.05]^a [0.05]^b = 00.029/ [0.100]^a [0.05]^b\\0.014 / [0.05]^a [0.05]^b = 00.029/ [2*0.05]^a [0.05]^b\\0.014 / = 0.029/ 2^a\\2^a = 2.07\\a = 1$

Using the information provided in lines 3 and 4 of the table and insering the value of a:

$0.041 / [0.100]^a [0.100]^b = 0.115 / [0.200]^a [0.200]^b\\0.041 / [0.100]^a [0.100]^b = 0.115 / [2 * 0.100]^a [2 * 0.100]^b\\$

$0.041 = 0.115 / [2 ]^a [2]^b\\ \[[2 ]^a [2]^b = 0.115/0.041\\ \[[2 ]^a [2]^b = 2.80\\\[[2 ]^1 [2]^b = 2.80\\\[[2]^b = 1.40\\b = \frac{ln 1.4}{ln 2} \\b = 0.5$

The rate law is: $Rate = k [CH_3 Cl] [Cl_2]^{0.5}$

The rate constant $k = \frac{Rate}{ [CH_3 Cl]^{a} [Cl_2]^{b}}$ then becomes:

$k = 0.014 / ( [0.050] [0.050]^(0.5) )\\k = 1.25$

b) Overall order of reaction = a + b

Overall order of reaction = 1 + 0.5

Overall order of reaction = 1.5

3 0

3 years ago

Please i need the answer for 18,19,20Answer and I will give you brainiliest ​

Please i need the answer for 18,19,20Answer and I will give you brainiliest