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andreyandreev [35.5K]
2 years ago
6

Hurry up as fast as possible Ill mark you brainlist

Chemistry
1 answer:
Vika [28.1K]2 years ago
6 0

It took 380,000 years for electrons to be trapped in orbits around nuclei, forming the first atoms.

These were mainly helium and hydrogen, which are still by far the most abundant elements in the universe. Present observations suggest that the first stars formed from clouds of gas around 150–200 million years after the Big Bang. Heavier atoms such as carbon, oxygen and iron, have since been continuously produced in the hearts of stars and catapulted throughout the universe in spectacular stellar explosions called supernovae.

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HELP PLEASE !!!<br> Name the gas formed when Magnesium metal reacts with hydrochloric acid
Mrrafil [7]

Answer:

<h2>hydrogen gas is produced .</h2>

6 0
2 years ago
Calcium forms ions with a charge of +2. Iodine forms ions with a charge of -1. Which of the following would represent an ionic c
astra-53 [7]

 The   formula that would represent an ionic  compound  that is composed of calcium and iodide ions  is   CaI2

 Explanation

Ionic compound  CaI₂ is formed  when Calcium form cation ( <em>a positively charged ion</em>) by losing 2 electrons while two iodine atoms form  anion ( <em>a negatively charged ion</em>)  by  gaining one electron each.

When writing down   formula of ionic compound, the formula  of cation  is written  first followed by anion  formula. therefore  Ca is written  first  followed by I.

The numeric subscript 2 after I(iodine) indicate that 2 atoms of iodine are involved  in bonding.

5 0
3 years ago
3. How many atoms in 3.91 moles of sodium?
Gala2k [10]

Answer:

Explanation:

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1 mol Na = 6.02*10^23 atoms

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x = 3.91 * 6.02 * 10^23

x = 23.65 * 10^23

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3 0
3 years ago
What is the difference between a purine and a pyrimidine?
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Purines are 2 Ring or Carbon Ring, Nitrogen containing bases. That consist of these 2 rings next placed next to each other. These examples include - Adenine and Guanine.

Pyrimidines are 1 or single Ring Nitrogen containing structures. There are 3 nitrogenous bases that are categorized as pyrimidines. Cytosine, Thymine, and Uracil.

4 0
2 years ago
Is milk a solution, colloid, suspension, or a compound?
allsm [11]
Milk is a colloid system
3 0
3 years ago
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