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harina [27]
3 years ago
14

Science, compare and contrast Quantitative and Qualitative observations

Chemistry
1 answer:
Mekhanik [1.2K]3 years ago
6 0

Quantitative observation have accuracy over qualitative observation as in Quantitative observation data is recorded in terms of number .

Explanation:
Qualitative observations are descriptive observations that don't involve numbers. " The freezing point of water is colder than the boiling point " is an example. Quantitative observations are numerical measurements. "The freezing point of watrr is 0 c and boiling point is 100 c" is a quantitative observation.
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9) Give the set of four quantum numbers that could represent the extra electron added (using the Aufbau principle) to the neutra
Pie

Answer:

See explanation

Explanation:

9) If an extra electron is added to the neon atom, then the electronic configuration becomes; 1s2 2s2 2p6 3s1

This last electron has quantum numbers;

n=3, l=0, m=0 and s = +1/2

This is so because the 2s level is already filled so the extra electron must go into the 3s level. The orbital quantum number and the magnetic quantum number for the s orbital is zero.

10) Electron affinity is the energy released when one mole of gaseous atoms accept one mole of gaseous electrons to form one mole of gaseous ions having a negative charge.

In the second period, fluorine has the greatest electron affinity since electron affinity increases across the period. The noble gas, neon has an electron affinity of 0KJ/mol.

11) Ionization energy decreases down the group but increases across the period due to increase in the size of the nuclear charge and decrease in the distance between the nucleus and the outermost electron. Hence, the process; Br+(g) ---->Br2+(g) + e- has the greatest ionization energy. Recall that the second ionization is always higher than the first ionization energy.

12)The order of decreasing metallic character here is K> As> P. Even though As and P belong to the same group, we must note that metallic character increases down the group hence the order written above.

3 0
2 years ago
Arsenic does not have any valence electrons in the 3D orbital because​
pogonyaev

Answer:

3d orbital is completely filled.

Explanation:

5 0
3 years ago
Under certain conditions, neon (Ne) gas diffuses at a rate of 4.5 centimeters per second. Under the same conditions, an unknown
Eva8 [605]
Mv^2 = const 
<span>m ~ 1/v^2 </span>

<span>(4.5/10.1)^2 = 0.198 </span>

<span>20.2 * 0.198 = 4.0 g/mol (Helium)</span>
6 0
3 years ago
Read 2 more answers
In the reaction aA + bB &gt;&gt; dD, the lowercase letters represent?
jolli1 [7]

Answer:

Coefficient

Explanation:

Chemical equation:

aA + bB    →   dD

This equation shows that reaction is balanced by coefficient q,b and d.

Reactant    coefficients              Product      Coefficient

A                    a                               D                     d

 B                    b                  

Every balanced equation follow the law of conservation of mass.

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass. The numbers 6 with CO₂, 6 with H₂O and 6 with O₂  are coefficient which balance the equation.

8 0
3 years ago
4Fe + 302 → 2Fe2O3
frez [133]

Answer:

2 -> O and Fe

Explanation:

5 0
3 years ago
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