Answers
Answer: b
A change of state is a reversible process.
Good luck
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Answers
Answer:
10% is a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4
EXPLANATION:give brainliest
The share of NAMSEK in year 4 is around $ shares (as given from the above table). Hence the value of one share will be $2.5/share
The share of ODX Group Inc., in year 4 is around $ shares (as given from the above table). Hence the value of one share is $
Therefore a share in NAMSEK worth as a percentage of a share in ODX Group Inc., in year 4 will be
= 0.1 or 10 %
Answers
Answer:
a) Warmer
b) Exothermic
c) -10.71 kJ
Explanation:
The reaction:
KOH(s) → KOH(aq) + 43 kJ/mol
It is an exothermic reaction since the reaction liberates 43 kJ per mol of KOH dissolved.
Hence, the dissolution of potassium hydroxide pellets to water provokes that the beaker gets warmer for being an exothermic reaction.
The enthalpy change for the dissolution of 14 g of KOH is:
Where:
m: is the mass of KOH = 14 g
M: is the molar mass = 56.1056 g/mol
The enthalpy change is:
The minus sign of 43 is because the reaction is exothermic.
I hope it helps you!
reflects light away from the retina
bends the cornea to correct vision
focuses light on the retina
Answers
Answer:
focuses light on the retina
Explanation:
Largest radius to Smallest radius
Answer Bank
K
Ca
Ga
Ge
As
Sc
Br
Kr
Answers
The elements according to the decreasing atomic radius are arranged as-
K, Ca, Sc, Ga, Ge, As, Br, Kr
An atomic radius is half the distance between adjacent atoms of the same element in a molecule. It is a measure of the size of the element’s atoms, which is typically the mean distance from the nucleus centre to the boundary of its surrounding shells of the electrons.
An atom gets larger as the number of electronic shells increase; therefore the radius of atoms increases as you go down a certain group in the periodic table of elements. The atomic radius decreases on moving from left to right across a period.
Thus the elements according to the decreasing atomic radius are arranged as -
K, Ca, Sc, Ga, Ge, As, Br, Kr
Learn more about Atomic radius, here:
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K
Ca
Ga
Ge
As
Br
Kr
Smallest
1s2 2s2 2p6 3s2 3p2
1s2 2s2 2p6 3s2 3p6 4s2 3d4
1s2 2s2 2p6
1s2 2s2 2p6 3s2 3p6 4s2 3d6
1s2 2s2 2p6 3s2
Answers
Answer:
The number of electrons for the Mg atom are 12 electrons. The electron configuration of magnesium is,
Mg (Z= 12) = 1s2 2s2 2p6 3s2
Explanation:
The first two electrons is placed in the 1s orbital. The 1s orbital can accommodate two electrons.
The next 2 electrons for magnesium go in the 2s orbital.
The next six electrons will go in the 2p orbital. The p orbital can hold up to six electrons.
We’ll put six in the 2p orbital and then put the remaining two electrons in the 3s.
Therefore, the Magnesium electron configuration will be 1s22s22p63s2.
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Answers
Answer: The molal boiling point elevation constant of X is
Explanation:
Formula used for Elevation in boiling point :
or,
where,
= boiling point constant = ?
m = molality
= mass of solute (urea) = 55.4 g
= mass of solvent X = 500 g
= molar mass of solute (urea) = 60 g/mol
Now put all the given values in the above formula, we get:
Thus the molal boiling point elevation constant of X is