Answer:
1) Has a smaller radius than oxygen because of the increased electromagnetic attraction of the nuclei
2) Has a smaller radius than chlorine because all the electrons of F have lower energy levels and have less repulsion of other electrons and hence are more attracted to the nuclei .
Explanation:
Further the electrons are from the nuclei , the bigger the atomic radius is.
(+) attraction of electrons to the nuclei, (-) repulsion of the electrons away from the nuclei.
1) From O to F:
(+) there is one more proton --> Stronger positive charge of the nuclei means that the electrons are attracted more , then they come closer to it and therefore the radius decreases
(-) There is one more electron --> Every electron is repulsed by others away from the nuclei --> the radius increases. But this effect is not so strong because the new electron is added at the same energy level.
Overall the (+) effect is stronger than the (-) effect --> Radius decreases from O to F
2) From F to Cl
(+) there is one more protons --> Same effect as before
(-) There is one more electron --> Every electron is repulsed by others away from the nuclei. But this time the new electrons have a higher energy level --> Meaning that they are less attracted and hence the radius increases.
And also the other inner layers of electrons (electrons of lower energy levels) repulse this new external layer of electrons more effectively than the case of O --> Strong repulsion effect (called electron shielding effect) --> Radius increases
Overall the (-) effect is stronger than the (+) effect --> Radius increases from F to Cl (or decreases from Cl to F)
Answer:
a fruit and oatmeal bar contains 142000 calories.
A nutritional calorie, or kilocalorie, is equal to 1000 calories.
E = 142 kcal · 1000 cal/kcal.
E = 142 000 cal.
Calorie (cal), or small calorie, is the amount of energy needed to heat one gram of water by one degree Celsius.
One small calorie is approximately 4.2 joules.
A calorie is a unit of energy.
Explanation:
hope it helps :)
Answer:
2.32
Explanation:
For the resolution of the problem one of the laws of Charles - Gay Lussac must be used, in which it is stated that if a<em> certain amount of gas is kept at a constant volume (as in this case), its pressure will be directly proportional to its absolute temperature.</em> Mathematically, it can be written as follows:
⇒to constant V
In the case of the statement, that we have an initial system (P₁ and T₁) and an final system (P₂ and T₂), the equation can be written:
It can be rearranged to clear P₂ which is what needs to be calculated, then:
It would only be necessary to <em>convert the temperature units from ° C to K</em>, to have the absolute temperature values. If T (K) = t (° C) + 273.15, then:
T₁ = 0 + 273.15 = 273.15 K
T₂ = 150 + 273.15 = 423.15 K
Now, you can replace the values to the equation and calculate P₂
≅ 2.32 atm
As the statement requests the result with three significant figures and no units, the answer is that<em> the final pressure is 2.32</em>
I think there is a mistake in strings mass, I think it is 0.7450 g, not 0.1450 g
First, we need to get no.of moles of SN2+ = molarity * volume
= 0.1 M* 0.0224 L = 0.00224 moles
So, according to the reaction equation:
2Fe3+(aq) + SN2+(aq) → 2 Fe2(aq) + SN4+ (Aq)
we can see that the molar ratio between Fe3+ and SN2+ = 2:1
∴ to get the no.of moles Fe3+ we have to multiply SN2+ by 2
= 2 * 0.00224 = 0.00448 moles
now, when we know the molar mass of Fe3+ = 55.847 g/mol
so, we can use it and the no. of moles to get the mass
mass Fe3+ = moles * molar mass
= 0.00448 * 55.847 = 0.25 g
∴ Mass Fe3+ % = 0.25/0.7450 * 100 = 33.6 %