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2 years ago

How do chemists model the valence electrons of metal atoms

Chemistry

1 answer:

natali 33 [55]2 years ago

6 0

Answer:

How do chemists model the valence electrons in metal atoms? The valence electrons of metal atoms can be modeled as a sea of electrons. ... Why are alloys more useful than pure metals? Alloys are important because their properties are often superior to those of their component elements.

Explanation:

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Calculate the solubility of zn(oh)2(s) in 2.0 m naoh solution. (hint: you must take into account the formation of zn(oh)2−4, whi

Brilliant_brown [7]

When we have:

Zn(OH)2 → Zn2+ 2OH- with Ksp = 3 x 10 ^-16

and:

Zn2+ + 4OH- → Zn(OH)4 2- with Kf = 2 x 10^15

by mixing those equations together:

Zn(OH)2 + 2OH- → Zn(OH)4 2- with K = Kf *Ksp = 3 x 10^-16 * 2x10^15 =0.6

by using ICE table:

Zn(OH)2 + 2OH- → Zn(OH)4 2-

initial 2m 0

change -2X +X

Equ 2-2X X

when we assume that the solubility is X

and when K = [Zn(OH)4 2-] / [OH-]^2

0.6 = X / (2-2X)^2 by solving this equation for X

∴ X = 0.53 m

∴ the solubility of Zn(OH)2 = 0.53 M

4 0

3 years ago

: How much energy is required to heat an iron nail with a mass of 25.5 grams from 65°C until it becomes red hot at 720°C?

Evgen [1.6K]

Q = mct

-Q= energy in Joules

-m = mass in grams

-c= specific heat capacity in J/g degree C

-t = delta temperature in degrees Celsius

So,

Q = m c t

Q = (7 grams)(0.448J/g C)(750 C - 25 C)

Q = 2273.6 J

Your final answer = 2273.6 Joules

8 0

3 years ago

A solution was prepared by mixing 20.00 mL of 0.100 M and 120.00 mL of 0.200 M. Calculate the molarity of the final solution of

Marat540 [252]

Answer:

0.186M

Explanation:

First, we need to obtain the moles of nitric acid that are given for each solution. Then, we need to divide these moles in total volume (120mL + 20mL = 140mL = 0.140L) to obtain molarity:

Moles Nitric acid:

0.0200L * (0.100mol / L) = 0.00200 moles

0.120L * (0.200mol / L)= 0.02400 moles

Total moles: 0.02400moles + 0.00200moles = 0.026 moles of nitric acid

Molarity: 0.026 moles / 0.140L

6 0

3 years ago

1. How many moles of HCl are in 7.80 X 1022 molecules? Answer:___0.13 moles of HCI

Nuetrik [128]

Answer: 7.80× $10^{22}$ $\frac{1}{6.02*10^{23} }$ =.13

Explanation:

8 0

2 years ago

What is the empirical formula of a compound containing 5.03 grams carbon, 0.42 grams hydrogen, and 44.5 grams chlorine?

PtichkaEL [24]

Answer:

The right choice is CHCl₃

Explanation:

To find the empirical formula firstly, change the mass to moles.

For Carbon :

no. of moles = (mass / molar mass) = (5.03 g / 12 g/mol )= 0.42 mol

For Hydrogen :

no. of moles = (mass / molar mass) = (0.42 g / 1 g/mol )= 0.42 mol

For Chlorine :

no. of moles = (mass / molar mass) = (44.5 g / 35.5 g/mol )= 1.25 mol

The ratio for Carbon and Hydrogen is 1 : 1

0.42 mol / 042 mol =1.00

Then find a ratio between the moles.

The ratio of Chlorine to both Carbon and Hydrogen is 3:1

1.25 mol / 0.42 mol = 2.98 ≅ 3

So the ratio is 1 C : 1 H : 3 Cl.

So, the right choice is CHCl₃

Carbon usually forms four bonds one to Hydrogen and 3 to Chlorine atoms.

Chlorine usually forms one bond to Carbon atom.

Hydrogen usually forms one bond Carbon atom.

4 0

3 years ago

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