Answer:
Claim 1
Explanation:
I chose this claim because I believe that when the plates under the earth move or shift, that's what causes an earthquake and when everything starts to shake. If it was the other way around there wouldn't be any reason for an earthquake to start.
hope that helped :)
7.8 g/cm3 because Mass/Volume=Density
As you can see in the picture we have +ΔH so that means for this reaction we need to GET heat. so the answer is A. endothermic :))
i hope this is helpful
have a nice day
Answer:
The pressure at 179 K is 21.8 kiloPascal.
Explanation:
To calculate the final pressure of the system, we use the equation given by Gay-Lussac Law. This law states that pressure of the gas is directly proportional to the temperature of the gas at constant pressure.
Mathematically,
where,
are the initial pressure and temperature of the nitrogen gas.
are the final pressure and temperature of the nitrogen gas.
We are given:
Putting values in above equation, we get:
The pressure at 179 K is 21.8 kiloPascal.
Answer:
Rb > K > Li > B > F
Explanation:
Atomic radius trend along period:
As we move from left to right across the periodic table the number of valance electrons in an atom increase. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases.
That's why fluorine has smaller atomic radius from given elements because it is present on right hand side and experience greater nuclear attraction.
Atomic radii trend along group:
As we move down the group atomic radii increased with increase of atomic number. The addition of electron in next level cause the atomic radii to increased. The hold of nucleus on valance shell become weaker because of shielding of electrons thus size of atom increased.
So from given elements Rubidium has greater atomic radius because of large atomic number and thus experience smaller nuclear attraction.
Rb > K > Li > B > F