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emmainna [20.7K]
3 years ago
9

What are some interesting facts about Dmitri Mendeleev?

Chemistry
1 answer:
Amiraneli [1.4K]3 years ago
6 0
Dmitri Mendeleev was born in Tobolsk on the 8th of February 1834.
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Draw the addition products formed when one equivalent of HBr reacts with 2,4-hexadiene. (Draw a single product for each. Ignore
Tems11 [23]

Answer:

The products are 4-bromo-2-hexene and 2-bromo-3-hexene

Explanation:

The reaction starts between terminal carbon of of of the double bonds and H^{+}. After attaching H^{+} to the carbon, one double bond disapears leaveing nearby CH positively charged. This intermediate is a resonance hybrid of two possible structures. Reaction of bromide at one of the carbons gives the 1,2-addition product and at the other carbon gives 1,4-addition product.

7 0
3 years ago
True or False: The closer the particles pack together, the less permeable<br> the soil is *
MArishka [77]

Answer:

True

Explanation:

Tighter particle compaction means less movement between particles for other substances to move through

permeable

(of a material or membrane) allowing liquids or gases to pass through it.

7 0
3 years ago
Which sound frequency with a human ear be able to detect? Select ALL correct answers.
Allisa [31]

Answer:

100 HZ 1,000 HZ 10,000 HZ there you go :)

5 0
3 years ago
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Part A: How many moles of NH3 can be produced from 21.0 mol of H2 and excess N2?
Lorico [155]

Answer:

a) 7.0 moles of NH3

b) 61.2 g of NH3

c) 4.15 g of H2

d) 8.9 ×10^19 molecules

Explanation:

Equation of the reaction;

N2(g) + 3H2(g) ⇄NH3(g)

a)

If 3 moles of H2 yields 1 mole of NH3

21 moles of H2 will yield 21 × 1 /3 = 7.0 moles of NH3

b)

1 mole of N2 yields 17 g of NH3

3.6 moles of N2 yields 3.6 moles × 17 g of NH3 = 61.2 g of NH3

c)

If 6g of H2 produces 17 g of NH3

xg of H2 will produce 11.76 g of NH3

x= 6 × 11.76/17

x= 4.15 g of H2

d)

If 6g of hydrogen yields 6.02 × 10^23 molecules of NH3

8.86 × 10^-4g of H2 yields 8.86 × 10^-4g × 6.02 × 10^23 /6 = 8.9 ×10^19 molecules

8 0
4 years ago
17. When 1 mol of the following substances react completely with oxygen, the
Len [333]
I would say Na. Oxygen has 2 valence electrons and when reacting with other molecules, the ones with the fullest or emptiest shells will react the least. Both H2 and Na are in the Alkali Metals in the first row, but since H2 has 2 molecules, it would use more oxygen than Ana
3 0
4 years ago
Read 2 more answers
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