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3 years ago

How did admitting Mendeleev deal with elements that had not yet been discovered

1 answer:

7 0

Mendeleev organized his table by atomic mass, rather than atomic radius. He was able to extrapolate where certain undiscovered elements should be on the table based on that.

For example, he said that since Calcium has mass of 40g and Titanium has a mass of 48 g, there must be some element between them with atomic mass of 44 g. That was later discovers to be scandium.

Hope this helps

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This compound, an eight-carbon alkane, serves as the 100 octane standard for gasoline. It has five methyl groups, one quaternary

Reika [66]

Answer:

2,2,4-Trimethyl-pentane

Explanation:

Structural characteristics of the compound is as follows:

Has five methyl group
Has one quaternary carbon
No. double bond
Gives four monochloro substitution products

Compound must have straight chain of 5 carbons.

Three methyl substituents are attached to 2 and 4 carbons.

Therefore, IUPAC name of the compound will be 2,2,4-Trimethyl-pentane.

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3 years ago

Which fossil fuel is mainly used for heating and cooking?

Anna [14]

I would say C. petroleum

A is wrong

B is impractical for "mainly used"

D thats too expensive

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3 years ago

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How many moles of aluminum are needed to react completely with 1.2 mol of feo

Lelu [443]

Answer:

0.80 mol Al

Explanation:

1) Word reaction:

Aluminum + ferrous oxide → aluminum oxide + iron

This is a single replacement reaction, in which aluminum, a more acitve metal than iron, replaces the iron in the ferrous oxide to form aluminum oxide and iron.

2) Skeleton chemical equation:

Al + FeO → Al₂O₃ + Fe

3) Balanced chemical equation:

Add the coeffcients to comply with the law of conservation of mass:

2Al + 3FeO → Al₂O₃ + 3Fe

4) Mole ratio of Al and FeO:

2 mol Al : 3 mol FeO

5) Set a proportion with the unkown and solve:

x / 1.2 mol FeO = 2 mol Al / 3 mol FeO

x = 1.2 mol FeO × 2 mol Al / 3 mol FeO = 0.80 mol Al ← answer

3 0

3 years ago

New molecules of dna are synthesized by copying the genetic sequence of another molecule of dna, which we call the template, so

crimeas [40]

The template that was specified as described would be the nucleic acid synthesis. The nucleic acid synthesis is a process in which DNA and RNA are "synthesised" so that the information from the genes would be successfully transferred to the proteins.

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Explain oscillation Pls help ty!

galina1969 [7]

Answer:regular variation in magnitude or position around a central point. Or movement back and forth at a regular speed

Explanation:

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3 years ago

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