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nlexa [21]
3 years ago
9

Nucleosynthesis began when _____ and ended when _____

Chemistry
1 answer:
lutik1710 [3]3 years ago
5 0
<h2>Nucleosynthesis.</h2>

Explanation:

A. the Big Bang occurred; the Big Crunch occurred

Nucleosynthesis is the process by which new atomic nucleus are formed from pre-existing protons and neutrons.

According to cosmic theories, the nucleosythesis began one minute after the occurrence of Big bang and will end with the big Crunch.

The Big bang theory describes all the processes by which the universe came into existence while the big crunch theory explains how universe will come to an end.  A

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1. Blood is an organic compound

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4 0
3 years ago
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In what orbital would to valence electrons of strontium be found? a.) 5s b.) 4s c.) none d.) 5p​
KonstantinChe [14]

Answer:

The correct answer is 5s

Explanation:

Strontium atomic number = 38

Electronic configuration is $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{10} 4s^{2} 4p^{6} 5s^{2}

As $5s$ orbital is valence orbital in strontium, the outer electrons exists in that orbital only.

4 0
3 years ago
The alchemical, medical, and technological traditions were precursors to chemistry. State a contribution that each made to the d
Kisachek [45]

Alchemy was a form of early chemistry that aimed to transmute base metals into gold and to create an elixir of longevity or eternal life.

Despite these connotations of the mythic and mystical, alchemical follow contend a crucial role within the evolution of contemporary science.

Historically, alchemy refers to each the investigation of nature and an early philosophical and religious discipline that combined chemistry with metal work. Alchemy additionally encompassed physics, medicine, astrology, mysticism, spiritualism, and art.

Chemistry in medicine:

Major contributions to health care have been made possible by chemistry. The development of new drugs involves chemical analysis and synthesis to form new compounds.

Chemistry contributes to the preparation of materials for surgery (sutures, artificial skin, and sterile materials). The sutures used in many surgeries today do not have to be removed, because they simply dissolve in the body after a period of time. Replacement blood vessels for heart and other types of surgery are often made of chemicals that do not react with the tissues, so they will not be rejected by the body and this was made possible with the help of the chemistry.

Chemistry in technologies:

The Iron Age, saw the prevalence of iron increase as the major metal of choice for cutting tools and weapons. Iron was slower to evolve as a material because it required higher temperatures to work the metal. This shift saw a change in smelting practices, improved furnace technologies, and also the development of forging, as opposed to the casting techniques used in the Bronze Age.

Now a days, in big industries, the machines which are made up of big metal sheets or metals, are given shape with the help of fire, by the process of Smelting. The industries tried to make plastics afterwards.

To know more about Alchemy, refer to this link:

brainly.com/question/5997100

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4 0
2 years ago
How many grams of MgCl2 will be obtained when 435 mL of 0.300 M HCl react with an excess of Mg(OH)2?
Marina CMI [18]
The grams of Mg(OH)2 produced is calculated as below

calculate the moles of HCl produced =molarity  xvolume/1000

= 0.3 x 435/1000= 0.1305 moles

write the equation for reaction
Mg(OH)2 +2HCl = MgCl2 + 2H2O

by use of mole ratio between HCl :MgCl2  which is 2 :1  the  moles of HCl =  0.1305 x1/2 =0.0653  moles of MgCl2

mass of MgCl2 = moles x molar mass

= 0.0653mol x95 g/mol = 6.204  grams of MgCl2
3 0
3 years ago
Pls help me with this question!
Liono4ka [1.6K]
C and d is correct one
7 0
3 years ago
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