When did the Big Bang occur ?

Chemistry

2 answers:

strojnjashka [21]2 years ago

7 0

According to scientists, the Big Bang occurred 13.8 billion years ago

Hope this helps

scZoUnD [109]2 years ago

5 0

13.8 billion years ago

This relic radiation is known as the cosmic microwave background radiation. The chemistry of life may have begun shortly after the Big Bang, 13.8 billion years ago, during a habitable epoch when the universe was only 10–17 million years old.

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Iron has a density of 7.86 g/cm3. Calculate the volume (in dL) of a piece of iron having a mass of 4.79 kg .

Kazeer [188]

M = 4.79 kg = 4790 g
d = 7.86 g/cm3
density = mass/volume
v = m/d
v = 4790/7.86
v = 609.4 cm3
1 cm3 = 10^-2 dL

v = 609.4 x 0.01 = 6.09 dL

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2 years ago

Saltpeter is a compound made of potassium(K), nitrogen(N), and oxygen(O). Every 100.0g of saltpeter contains 38.67g potassium an

Oksanka [162]

Use a proportion ...
100.0g - 38.67g - 13.86g = 47.47g Oxygen 
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3 years ago

In the reaction 2H2 + O2 → __H2O, what coefficient should be placed in front of H2O to balance the reaction?

Westkost [7]

I would try the answer A

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Reduction occurs at which electrode?

OLEGan [10]

Answer:

The electrode that removes ions from solution

Explanation:

Each electrochemical cell consists of an anode and a cathode. Oxidation occurs at the anode and reduction occurs at the cathode.

At the anode, ions move from the electrode into the solution while at the cathode ions move from the solution to the electrode.

At the cathode, metal ions accept electron(s) and become deposited on the electrode hence this electrode removes ions from solution. This is reduction.

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Which pair will for an ionic compound

vovikov84 [41]

Answer: A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions.

Explanation:

A pair of elements will most likely form an ionic bond if one is a metal and one is a nonmetal. These types of ionic compounds are composed of monatomic cations and anions.

Explanation:

The chart below shows monatomic ions formed when an atom loses or gains one or more electrons, and the ionic compounds they form. You can check your periodic table to see that the cations are monatomic ions formed from metals, and the anions are monatomic ions formed from nonmetals.

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