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Klio2033 [76]
2 years ago
13

Based on the article "Will the real atomic model please stand up?,” describe one major change that occurred in the development o

f the modern atomic model.
Chemistry
2 answers:
ololo11 [35]2 years ago
4 0

Sample Response: "The one major change that occurred was the placement and organization of the electron. Rutherford’s model identified that the electrons were at a distance from the nucleus, Bohr’s model identified that the electrons occurred at levels that related to their available energy, and the modern atomic model shows that electrons are located in a predicted area but cannot be identified in a specific point".

nydimaria [60]2 years ago
3 0
I don't know this article, but I do know some major changes: first, the change from the plum pudding model (no nucleus, just electrons) to the gold foil experiment, which had Rutherford shoot alpha particles at a sheet of gold only to find them rebounding, proving the existence of a positively charged mass, i.e a nucleus, in the atom. However, this changed again when Bohr realized that the negatively charged electrons should be attracted to the positively charged center, so that there must be something else inside the nucleus. 
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If a gas at a pressure of 600 mmHg and a volume of 200 mL is changed to 780 mmHg, then what will be the new volume?
svlad2 [7]
P1V1=P2V2
(600/760)(.200)=(780/760)x
x=.1538L or 153.8mL
8 0
3 years ago
How can the major components of air be separated
WARRIOR [948]
Air can be separated into its components by means of distillation in special units. So-called air fractionating plants employ a thermal process known as cryogenic rectification to separate the individual components from one another in order to produce high-purity nitrogen, oxygen and argon in liquid and gaseous form.
4 0
2 years ago
How many electrons would found in the ion who’s symbol is I-?
inna [77]

Answer:

54 electrons

Explanation:

I(iodine) has 7 electrons on the last level, so it can take 1 more electrons.

I- also shows that 1 additional electron was added. (I^-1)

I (iodine) has 53 electrons.

So, I- will have 54 electrons.

7 0
3 years ago
True or false: if a compound contains ions then both positive and negative ions must be present.
Masteriza [31]
This is false, a compound does not have to contain both cations and anions if ions are present.
3 0
3 years ago
When 131.0 mL of water at 26.0°C is mixed with 81.0 mL of water at 85.0°C, what is the final temperature? (Assume that no heat i
JulsSmile [24]

Answer:

63.52°C is the final temperature

Explanation:

1) 131.0 mL of water at 26.0°C

Mass of water = m

Volume of the water =131.0 mL

Density of the water = 1.00 g/mL

Density=1.00 g/mL=\frac{m}{131.0 mL}

m = 131.0 g

Initial temperature of the water = T_i = 26.0°C

Final temperature of the water = T_f

Change in temperature ,\Delta T=T_f-T_i

Heat absorbed 131.0 g of water = Q

Q=m\times c\times \Delta T

2) 81.0 mL of water at 85.0°C

Mass of water = m'

Volume of the water =81.0 mL

Density of the water = 1.00 g/mL

Density=1.00 g/mL=\frac{m'}{81.0 mL}

m' = 81.0 g

Initial temperature of the water = T_i' = 85.0°C

Final temperature of the water = T_f'

Change in temperature ,\Delta T'=T_f'-T_i'

Heat lost by 81.0 g of water = Q'

Q'=m'\times c\times \Delta T'

After mixing both liquids the final temperature will become equal fro both liquids.

T_f=T_f'

Since, heat lost by the water at higher temperature will be equal to heat absorbed by the water at lower temperature.

Q=-Q' (Law of conservation of energy.)

Let the specific heat of water be c

m\times c\times \Delta T=m'\times c\times \Delta T'

131.0 g\times c(T_f-26^oC)=-(81.0.0 g\times c(T_f-85^oC))

T_f=63.52^oC

63.52°C is the final temperature

4 0
3 years ago
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