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lutik1710 [3]
4 years ago
9

Unit 1B Portfolio item for CA.

Chemistry
1 answer:
Mila [183]4 years ago
3 0
<span>No. Radiocarbon dating has an effective range to only about 62,000 years ago (and the further back you go, the higher your error will be). The fossils in the shale are much older than that, so you can be sure that the leaves are not recent enough to be dated that way.</span>
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The atomic radius of metal X is 1.20 × 102 picometers (pm) and a crystal of metal X has a unit cell that is face-centered cubic.
Vika [28.1K]
The formula for density is density = \frac{number of atoms in FCC * atomic weight}{ radius^{3}*Na}. Substituting the given, the density is 162.69 g/cm3. 
7 0
3 years ago
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A sample of Cd(OH)2 is added to pure water and allowed to come to equilibrium at 25ºC. The concentration of Cd +2 = 1.7 x 10 -5M
Archy [21]

Answer:

Ksp=2.0x10^{-14}

Explanation:

Hello there!

In this case, given the solubilization of cadmium (II) hydroxide:

Cd(OH)_2(s)\rightleftharpoons Cd^{2+}(aq)+2OH^-(aq)

The solubility product can be set up as follows:

Ksp=[Cd^{2+}][OH^-]^2

Now, since we know the concentration of cadmium (II) ions at equilibrium and the mole ratio of these ions to the hydroxide ions is 1:2, we infer that the concentration of the latter at equilibrium is 3.5x10⁻⁵ M. In such a way, the resulting Ksp turns out to be:

Ksp=(1.7x10^{-5})(3.4x10^{-5})^2\\\\Ksp=2.0x10^{-14}

Regards!

3 0
3 years ago
How does a difference in 1 pH unit change in terms of H+ concentration? Ex: How does a pH of 3 differ from the pH of 4? Which on
yuradex [85]

Answer:

A difference of 1 would mean there is either x10 more or less depending on where you are starting.

Explanation:

The pH of 3 differs from 4 because the acidity of 3 is 10x higher than that of 4. This is due to how the scientific notation of 3 in relation to pH is 10x^-3 while that of 4 is 10^-4 so in terms of the stronger acid that would be the one with the pH of 3.

6 0
3 years ago
I WILL GIVE YOU BRAILEST!!!!!!!!!
Sholpan [36]

Answer:

D.

atomic modifier

Explanation:

. Identify at least three reasons the Articles of Confederations failed as a governing document. In your opinion, evaluate which defect was most debilitating, using evidence and your knowledge of American government to justify your position. [5]

6 0
4 years ago
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Identify this molecule
Ierofanga [76]
My guess on that molecule is nucleus , sorry if it’s not correct
7 0
3 years ago
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