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andreev551 [17]
3 years ago
8

Which of the following statements are true? I. Models are always wrong unless they are proved by a theory. II. Elements, such as

lead, are made of tiny particles that mostly consist of open space. III. The air you breathe is an example of a heterogeneous mixture. IV. Because NH3 always contains the same relative numbers of atoms, it will always contain 4.6 g of nitrogen for every 1.0 g of hydrogen.
Chemistry
1 answer:
bazaltina [42]3 years ago
7 0

Answer:

The only option that has a true statement is hence only (ii) and (iv) are TRUE

Explanation:

The correct option is (ii) - Elements, such as lead, are made of tiny particles that mostly consist of open space.

for the first option (i) - Models are always wrong unless they are proved by a theory- This is not true because not all models are always wrong and they are not necessarily need to be proved by a theory to ascertain the veracity of the model, one such example is the Neil's bohr model of atom.

for the third option (iii) - The air you breathe is an example of a heterogeneous mixture. This is wrong because Air is a homogeneous mixture containing Nitrogen and Oxygen and other constituents as its composition.

for the last option (iv) - Because NH3 always contains the same relative numbers of atoms, it will always contain 4.6 g of nitrogen for every 1.0 g of hydrogen - this is also  true as the amount contained is dependent on the number of atoms in the balanced equation for the production of ammonia.

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The part that is missing is: make oxygen more readily available to the organism. This is actually a lifesaving property that makes itself available for living species.
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The electron configurations of some elements are given. Based on the electron configurations, which elements can likely form ion
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In the case of Zn, it is likely eligible for one charge, as its 3d is full, it can lose the electrons from the 4s2 level that it does to become Zn2+.

Iron has 6 electrons in the 3d energy level, which signifies that it would give up 6+2 to get to the next stable energy level. It is much convenient for it to give up the 4s2 and then one more out of the 3d6 to produce Fe2+ and Fe3+ respectively.  

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3 years ago
Write a balanced chemical equation for the standard formation reaction of gaseous nitrogen monoxide (NO). Please help me
kherson [118]

Answer:

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3 years ago
Define the overvoltage in an electrolysis process​
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5 0
2 years ago
Write a method that could be used to produce pure crystals of copper chloride from copper oxide and hydrochloric acid.
joja [24]

- Describe how you would make the salt from the reactants.

CuO + 2 HCl → CuCl₂ + H₂O

- Describe how you would purify the salt from the reaction mixture.

Filter the solution and let the product crystallize.

Explanation:

The reaction between copper oxide (CuO) and hydrochloric acid (HCl) will produce copper chloride (CuCl₂) and water:

CuO + 2 HCl → CuCl₂ + H₂O

-Describe how you would make the salt from the reactants

In a beaker which contain cooper oxide add the hydrochloric acid. To avoid working with concentrated hydrochloric acid, the acid may be diluted with water but make sure the add the stoechiometric amount (and a little bit of excess) in respect with the copper oxide.

-Describe how you would purify the salt from the reaction mixture.

Let the reaction proceed and then filter the solution to remove the unreacted cooper oxide.

Let the filtered solution, which contain copper chloride, water and unreacted hydrochloric acid, to stand undisturbed for several days. You may see the crystals growing from the solution. To speed up the process you may reduce the temperature.

Learn more about:

purifying compounds

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#learnwithBrainly

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