3 years ago

Identify the f-block element.

Chemistry

1 answer:

GaryK [48]3 years ago

3 0

Answer: E. none of these

Explanation: because the f-block element is n-2

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State, in terms of the arrangement of atoms, the difference in hardness between diamond and graphite.

sleet_krkn [62]

The difference in hardness between diamond and graphite is that diamond has an ordered arrangement of atoms within its structure that makes it harder and stronger than graphite. This is due to the high pressure and high temperature that it went.

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3 years ago

The ksp of yttrium fluoride, yf3, is 8.62 × 10-21. calculate the molar solubility of this compound.

motikmotik

Answer:

The molar solubility of YF₃ is 4.23 × 10⁻⁶ M.

Explanation:

In order to calculate the molar solubility of YF₃ we will use an ICE chart. We identify 3 stages: Initial, Change and Equilibrium and we complete each row with the concentration of change of concentration. Let's consider the solubilization of YF₃.

YF₃(s) ⇄ Y³⁺(aq) + 3 F⁻(aq)

I 0 0

C +S +3S

E S 3S

The solubility product (Ksp) is:

Ksp = [Y³⁺].[F⁻]³= S . (3S)³ = 27 S⁴

$S=\sqrt[4]{Ksp/27} =\sqrt[4]{8.62 \times 10^{-21} /27}=4.23 \times 10^{-6}M$

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3 years ago

__CH4+__CL2> __CCL4+__HCL

tatyana61 [14]

Answer:

CH4+4Cl2->CCl4+4HCl

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3 years ago

Argon occupies a volume of 28.3 L at a pressure of 0.36 atm. Find the volume of argon when the pressure is increased to 0.85 atm

FromTheMoon [43]

Answer:

Explanation:

Boyles law

P1 (.36)

V1(28.3)

P2(.85)

V2(?)

P1*V1=P2*V2

plug it in, and you get 12

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3 years ago

Two different liquids are mixed together. Which observation indicates that an exothermic chemical reaction has taken place?

Lilit [14]

Answer:

rise in temp I think

Explanation:

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3 years ago