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4 years ago

When aluminum oxidizes in air it forms aluminum oxide (al2o3) if a 51 sheet?

1 answer:

8 0

Answer: mol Al2O3 x 1 mol Al/ 2 mol Al2O3= .25 mol Al The balanced equation tells us that it takes 4 moles of Al to produce 2 moles of Al2O3. 0.50 moles Al2O3 x (4 moles Al / 2 moles Al2O3) = 1.0 moles Al 1.0 moles Al x (27.0 g Al / 1 mole Al) = 27.0 g Al

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Which pair of statements below is correct? Multiple Choice An octet is formed via ionic bonding when one or more valence electro

tresset_1 [31]

Answer:

An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

An octet is formed via covalent bonding when valence electrons are shared between atoms.

An octet is always formed via ionic bonding

Explanation: The essence of bonding is stability. An octet or duplet state is formed when one or more valence electrons are shared. when the electrons are shared, the type of bond formed is a covalent bond. An octet is formed via ionic bonding when one or more valence electrons are transferred from one atom to another.

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3 years ago

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mojhsa [17]

Answer:

7 to 5

Explanation:

power of 500 to 5

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2 years ago

Which line of evidence has been traditionally accepted as conclusive proof of evolution? the presumed age of the Earth the fossi

Nataly_w [17]

The most generally accepted form of conclusive evidence for the theory of Evolution is the fossil record.

<h3>What is the theory of Evolution?</h3>

The theory of evolution was proposed by Charles Darwin.
It states that as time passes, organisms evolve to better adapt to their environments.
This is closely related to natural selection, which is considered a driving force of evolution.

<h3>How the fossil record supports this theory</h3>

The fossil record provides essential data to support this claim.
The data comes in the form of the comparison between fossils of two closely related organisms, separated by a matter of generations, that present changes in the genetic code that made them more apt for survival.

Therefore, we can confirm that the most generally accepted form of conclusive evidence for evolution is the presence of fossils that show the genetic correlation between two organisms and the progression of evolution between them.

To learn more about evolution visit:

brainly.com/question/2725702?referrer=searchResults

5 0

3 years ago

The ion mn2+ has how many unpaired electrons

photoshop1234 [79]

It has 5 unpaired electrons

3 0

3 years ago

A flame test of a colorless solution gives a bright yellow color. When reacted with AgNO3 a white precipitate forms that dissolv

hichkok12 [17]

Answer:

The compound is Na2CO3

Explanation:

A flame test of a colorless solution gives a bright yellow color. The yellow color shows the presence of Sodium.

NaX + AgNO3 → AgX + NaNO3

When reacted with AgNO3 a white precipitate.

AgX + HNO3 → AgNO3 + H2O + CO2

A white precipitate will be formed when AgNO3 reacts with Sodium Chloride (NaCl) or Sodium carbonate(Na2CO3). (Also NaF, Na3PO4 are possible).

When HCL is added to the unknown solution, bubbles form.

Forming bubbles means that there is formed CO2 (and H20)

Na2X + 2HCl → 2NaCl + H2O + CO2

To form CO2 there is carbon needed

This shows that X is CO3 and the compound is Na2CO3

To control:

Na2CO3 + AgNO3 → Ag2CO3 + NaNO3

⇒Ag2Co3 is the white precipitate formed

This precipitate Ag2CO3 + HNO3 will disolve in AgNO3, CO2 and H2O

When Na2CO3 reacts with HCl there is formed NaCL together with bubbles ( which is CO2 and H2O).

The compound is Na2CO3

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4 years ago