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nekit [7.7K]
2 years ago
5

I need help please this is my final

Chemistry
1 answer:
aliina [53]2 years ago
8 0

Answer:

hmm fart

Explanation:

yep my final

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Determine the number of HC=CH, monomeric units in one molecule of polyethylene with a molar
VladimirAG [237]

polyethylene contains HC=CH units.

mass of this is 26 gram/mol

number of such units =13500/26

3 0
3 years ago
Match these items. 1 . Niels Bohr negative charge 2 . n=1 shell basic unit of matter 3 . electron electron path 4 . electron clo
steposvetlana [31]

Answer: Niels Bohr - Drew first picture of atom

n=1 shell - inner orbit

electron - Negative charge

Electron cloud - 3D orbits

Proton - postive charge

Molecule - two or more atoms bonded

Orbit - electron path

John Dalton - Develope atomic theory

Explanation:

1. Niels Borh proposed an atom model taking into account quantum physics. In his model, he proposed that electrons orbit around the nucleus in limited areas and if they need energy to move between orbitals. Although this model has been modified according to recent discoveries, basic postulates remain, that is why is so important the Borh's model

2. n is the principal quantum number which correspond to the orbital of and atom. According to Bohr's model orbits are organized depending on the energy, obits with lower energy are closer to the nucleus and have lower quantum number, so n=1 represent the orbit which closer to the nucleus

3. An electron is a particle of the atom, is the smallest of them and it has negative charge that are attracted by the positive charge of protons, that is why they are orbiting the nucleus.  

4. In modern model there is a principle of uncertainty that states that we can not know the speed and the position of an electron at the same time, so the orbits are consider as spaces or regions where is probable to find and electron. This regions are three dimentional as we conceive the world so they are compare to a cloud with negative charge

5. proton is the partice located in the nucleus of the atom. It was discovered by Rutherford who realized that this particles were attracted to negative charges, and takin into account that different charges attract each other, he concluded that protons have positive charge

6. molecules are the elemental part of a compound and they are made by the two or more atoms that bond through electrons

7 atom is the basic unit of matter because it has particular characteristics according to the number of protons and electrons. This units built all things known in the universe.

8. An orbit was consider by Borh as the path that the electron follows in order to remain closer to the nucleus. He proposed that is was a straigh path as the planets arroud the sun, but nowdays we know that elelctrons are considered in a 3D space that move arround the nucleus.

9. John Dalton is the scientist in modern era that proposed the existence of atoms after studing greek philosophers writings about matter. He proposed that atoms were the smallest unit of matter and the make all the things in nature. Acoording to him, the nature of the electron and the size of it made the diferent elements in the universe. His postulates are very important in science because open a new are of research for chemists and physicists

8 0
3 years ago
Which one of the following represents the number of units of each substance
netineya [11]

Answer:B

Explanation:Coefficient represents the number of units of each substance.

4 0
3 years ago
In the laboratory you dissolve 22.0 g of nickel(II) nitrate in a volumetric flask and add water to a total volume of 125
Ahat [919]

Answer:

<u>1.364 M</u>.

Explanation:

Molarity formula: M= n/v, where n is moles of solute, and v is liters of solution.

Now, we need to convert the grams of nickel to moles and the volume of water to liters.

125mL/1000= 0.125 L.

To convert nickel grams to moles, we need to take a look at it's chemical formula, which is:

Ni(NO_{3} )_{2}

Now we count how many molecules of each element we have:

Ni= 1

N= 2

O= 6

Calculate the weight (g) of each element (the values of g/mol can be found on the periodic table and they may vary slightly between one table and the other):

Ni: (1) (58.6934)= 58.6934

N= (2) (14.007)= 28.014

O= (6) (15.999)= 95.994

Sum all the values to obtain the total weight of 1 mole of this compound:

58.6934+28.014+95.994= 129(g/mole)

Now that we know the that 129 grams equal 1 mole of nickel(II) nitrate, we can convert the 22.0 g to moles:

129g ------- 1 mole

22.0g ----- x

x= (22*1)/129= 0.1705 moles.

Now, we have all the values needed to calculate the molarity of this solution. All we have to do is substitute the values in the formula:

M= (0.1705 moles) / (0.125 L)= <u>1.364 M</u>.

3 0
2 years ago
In which pair would both compounds have the same empirical formula? A. H2O and H2O2 B. BaSO4 and BaSO3 C. FeO and Fe2O3 D. C6H12
Kazeer [188]
The pair of both compounds that have the same empirical formula are C6H12O6 and HC2H3O2. The answer is letter D. <span>H2O and H2O2, BaSO4 and BaSO3 and FeO and Fe2O3 do not have the same empirical formula.</span>
4 0
3 years ago
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