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3 years ago

Which property can be used to tell gold and pyrite apart?

Chemistry

1 answer:

zubka84 [21]3 years ago

6 0

Answer:

D. Malleability

Explanation:

Gold is made up of the element Au and it is a metal.

Pyrite is iron sulfide and it is a non-metal.

They have very similar appearance to such an extent that pyrite is widely called the fool's gold.
To distinguish between the two, we simply explore their metallic properties.
Gold is malleable. Pyrite is not. It will crumble under pressure.

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A hurricane will weaken after making landfall.

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2 years ago

Which sample contains more atoms: 3.89 g of nickel or 6.61 g of silver? defend your answer

Lubov Fominskaja [6]

Nickel contains more atoms.

<u>Explanation:</u>

Number of atoms is determined by the Avogadro number.

1 mole of substance contains 6.022 X 10²³ atoms.

Given:

Mass of Nickel, Ni = 3.89g

Molecular weight of Ni = 58.6934g

Number of moles of Ni = 3.89/58.6934g

Number of atoms of Ni = $\frac{3.89 X 6.022 X 10^2^3}{58.6934}$

Number of atoms of Ni = 0.39 X 10²³

Mass of silver, Ag = 6.61g

Molecular weight of Ag = 107.8682g

Number of moles of Ag = 6.61/107.8682

Number of atoms of Ag = $\frac{6.61 X 6.022 X 10^2^3}{107.8682}$

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Therefore, Nickel contains for atoms.

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2 years ago

Which of these solutions is the most basic?

dalvyx [7]

<h2>Question↷</h2>

Which of these solutions is the most basic?

[OH-] = 4.3 x 10-9 M

[OH-] = 2.8 x 10-11 M

[OH-] = 6.7 x 10-10 M

[OH-] = 1.0 x 10-5 M

<h2>Answer↷</h2>

<u>[OH-] = 1.0 x 10-5 M</u> ✓

<h2>Solution↷</h2>

[OH-] = 4.3 x 10-9 M

[OH-] = 4.3 x 10^-9 M
pOH = - log [OH^1-]
pOH = - log [4.3 x 10^-9]
pOH = 8.36
pH = 14- 8.36
pH = 5.64

_______________________________________

[OH-] = 2.8 x 10-11 M

[OH-] = 2.8 x 10^-11 M
pOH = - log [OH^1-]
pOH = - log [2.8 x 10^-11 ]
pOH = 10.55
pH = 14-10.55
pH = 3.45

_______________________________________

[OH-] = 6.7 x 10-10 M

[OH-] = 6.7 x 10^-10 M
pOH = - log [OH^1-]
pOH = - log [6.7 x 10^-10]
pOH = 9.17
pH = 14-9.17
pH = 4.83

_______________________________________

[OH-] = 1.0 x 10-5 M

[OH-] = 1.0 x 10-5 M
pOH = - log [OH^1-]
pOH = - log [1.0 x 10^-5 ]
pOH = 5
pH = 14-5
pH = 9

_______________________________________

we know that , the solution with <u>pH > 7</u> is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is

<u>[OH-] = 1.0 x 10-5 M</u> with pH = 9

_______________________________________

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1 year ago

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