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mamaluj [8]
3 years ago
7

What is difference between layer A and layer b? ​

Chemistry
1 answer:
lakkis [162]3 years ago
7 0

Answer:

can you send me a picture of what layer a and look b look like and then I will be able to evaluate

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.Which of the following is true about elements?
Ludmilka [50]

Answer:

C

Explanation:

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3 years ago
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The density of potassium, which has the BCC structure, is 0.855 g/cm3. The atomic weight of potassium is 39.09 g/mol. Calculate
Nimfa-mama [501]

Answer:

lattice parameter = 5.3355x10^-8 cm

atomic radius = 2.3103x10^-8 cm

Explanation:

known data:

p=0.855 g/cm^3

atomic mass = 39.09 g/mol

atoms/cell = 2 atoms

Avogadro number = 6.02x10^23 atom/mol

a) the lattice parameter:

Since potassium has a cubic structure, its volume is equal to:

v = [(atoms/cell)x(atomic mass)/(p)x(Avogadro number)]

substituting values:

v =[(2)x(39.09)/(0.855x6.02x10^23)]=1.5189x10^-22 cm^3

but as the cell volume is

a^3 =v

a=\sqrt[3]{v}=\sqrt[3]{1.5189x10^{-22} } = 5.3355x10^-8 cm

for a BCC structure, the atomic radius is equal to

r=\frac{ax\sqrt{3} }{4}=\frac{5.3355x10^{-8}x\sqrt{3}  }{4}=2.3103x10^{-8}cm

7 0
3 years ago
A ___ has a fixed shape and a fixed volume.
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The answer to this is: solid

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How is a igneous rock formed?
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The magma from a volcano is cooled
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Measurements show that the ph of a particular lake is 4.0. What is the hydrogen ion concentration of the lake?
fomenos

Answer: Hydrogen ion concentration of the lake is 10^{-4}M

Explanation:

pH or pOH is the measure of acidity or alkalinity of a solution.

pH is calculated by taking negative logarithm of hydrogen ion concentration. Acids have pH ranging from 1 to 6.9 and bases have pH ranging from 7.1 to 14.

To calculate the pH of the solution, we use the equation:

pH=-\log[H^+]

We are given:

pH = 4.0

Putting values in above equation, we get:

4.0=-\log[H^+]

[H^+]=10^{-4.0}

[H^+]=10^{-4}

Thus hydrogen ion concentration of the lake is 10^{-4}M

6 0
3 years ago
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