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sergij07 [2.7K]
4 years ago
8

How did the atmosphere get its oxygen

Chemistry
2 answers:
riadik2000 [5.3K]4 years ago
7 0
Because super tiny organisms called cyanobactierea (alge) they conducted photosynthesis and they us sunshine water and Carbon D to make Oxygen
AleksandrR [38]4 years ago
3 0
Tiny organisms know as cyanbacteria, or blue-green algae. These microbes conduct photosynthesis : using sunshine, water and carbon dioxide to produce carbohydrates and, yes, oxygen.

There's your answer. Hope This Helps :)
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Groups on the Periodic Tables have the same number of valence electrons which affects
Anastasy [175]

Answer:

The vertical columns (group) of the periodic table are arranged such that all it's elements have the same number of valence electrons. All elements within a certain group thus group share similar properties.

8 0
3 years ago
Need help with balancing equations
solniwko [45]

The balanced equation of the reaction shows that the mole of atoms on both sides of the reaction are equal.

<h3>What are balanced chemical equations?</h3>

Balanced chemical equations are equations in wgich the moles of each species on both sides of the reaction are equal.

To balance chemical equations, numerical coefficients are placed in front of the species in the reaction.

The balanced equations of the reaction are as follows:

3Pd + 4H_3PO_4 \rightarrow Pd_3(PO_4)_4 + 6H_2 \\

C_{11}H_{24} + 17O_2 \rightarrow 11CO_2 + 12H_2O \\

2Al(HCO_3)_3 + 3H_2SO_4\rightarrow Al_2(SO_4)_3 +6CO_2 +6H_2O \\

Therefore, the balanced equation of the reaction shows that the mole of atoms on both sides of the reaction are equal.

Learn more about balancing equations at: brainly.com/question/11904811

#SPJ1

7 0
3 years ago
What is the pH of a solution with a concentration of 4.2 × 10–5 M H3O+? 2.31 4.38 5.62 6.87
Eva8 [605]
<h3><u>Answer</u>;</h3>

pH = 4.38

<h3><u>Explanation;</u></h3>

Consider that ;

[H3O+] = 10-pH mol/L  

 Therefore; the pH is the -log of the [hydronium ion].  

pH = - log [H3O+]

Thus;

pH = - log (4.2 × 10^–5)

     = 4.38

3 0
3 years ago
Read 2 more answers
How many moles of AgNO3 must react to form 0. 854 mol Ag? mol AgNO3.
babunello [35]

The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.

The balanced chemical equation for the dissolution of silver nitrate has been:

\rm AgNO_3\;\rightarrow\;Ag^+\;+\;NO_3^-

The aqueous solution of silver nitrate has been dissociated into the constituent silver and nitrate ions.

In a balanced chemical equation, the coefficient has been equivalent to the moles of each reactant forming the moles of product.

From, the balanced equation,

\rm 1\;mol\;AgNO_3=1\;mol\;Ag

The given moles of Silver has been 0.854 mol. Thus, the moles of silver nitrate required has been given as:

\rm 1\;mol\;Ag^+=1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;\times\;1\;mol\;AgNO_3\\0.854\;mol\;Ag^+=0.854\;mol\;AgNO_3

The moles of silver nitrate required to form 0.854 mol silver ion has been 0.854 mol.

For more information about the moles produced, refer to the link:

brainly.com/question/10606802

6 0
2 years ago
If the trend in a property is periodic, it means it will
kotegsom [21]

Answer:

d) repeat

Explanation:

If the trend in a property is periodic, it means it will repeat on the periodic table.

Periodic properties on the table have a constant pattern as we move up or down a group or across a period from left to right.

  • This helps to predict some of the salient properties of elements as we move through the periodic table.
  • For example, on most periodic groups, metallicity increases as we move down the group and it decreases across the period.
8 0
3 years ago
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