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notka56 [123]
3 years ago
15

How could Mendeleev predict the properties of elements that had not yet been discovered?

Chemistry
1 answer:
icang [17]3 years ago
3 0
It was the element of aluminium where they predict their properties <span />
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Given that a for HCN is 6. 2×10^−10 at 25 °C. What is the value of b for cn− at 25 °C?
Kay [80]

If Ka for HCN is 6. 2×10^−10 at 25 °C, then the value of Kb for cn− at 25 °C is 1.6 × 10^(-5).

<h3>What is base dissociation constant? </h3><h3 />

The base dissociation constant (Kb) is defined as the measurement of the ions which base can dissociate or dissolve in the aqueous solution. The greater the value of base dissociation constant greater will be its basicity an strength.

The dissociation reaction of hydrogen cyanide can be given as

HCN --- (H+) + (CN-)

Given,

The value of Ka for HCN is 6.2× 10^(-10)

The correlation between base dissociation constant and acid dissociation constant is

Kw = Ka × Kb

Kw = 10^(-14)

Substituting values of Ka and Kw,

Kb = 10^(-14) /{6.2×10^(-10) }

= 1.6× 10^(-5)

Thus, the value of base dissociation constant at 25°C is 1.6 × 10^(-5).

learn more about base dissociation constant :

brainly.com/question/9234362

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2 years ago
Water is a polar molecule. What does that mean?
aalyn [17]
The answer. Is c I hope this helps
7 0
3 years ago
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MyRoad is a(n):
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c. online college and career planning resource you can  access once you take the PSAT.

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What monatomic ions do selenium (z = 34) and phosphorus (z = 15) form? (type your answer using the format [cu]+ for cu+ and [cu]
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The answer:
for the monoatomic <span>selenium ions
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as for the monoatomic phosphorus ions
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6 0
3 years ago
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