Answer:
Neutralization reactions occur when two reactants, an acid and a base, combine to form the products salt and water. So OPTION B IS CORRECT
Explanation:
Answer:
The atomic radius of krypton is similar to that of bromine. However, the effective nuclear charge of krypton is greater than that of bromine.
Explanation:
Ionizing an atom require moving an electron from the electron cloud of the atom to a point infinitely far away from the atom. The first ionization energy of this atom is the energy change in this process.
The electron and the nucleus are oppositely-charged. There is an electrostatic force between the two. Removing the electron requires overcoming this attraction. The size of the energy input depends on the electrostatic potential energy of the electron (the gravitational potential energy is much smaller than the electrostatic potential energy.) The separation between the electron and the nucleus is much larger than their radii. Both objects can be considered as point charges. Coulomb's Law gives the electrostatic potential energy of the two point charge that are close to each other.
,
where
is Coulomb's constant,
and 
are the two charges, and
is the separation between the two charges.
Krypton and bromine are right next to each other in the same period. Their atomic radii will be similar to each other. The separation between the outermost electron and the nucleus will also be similar for the two elements.
The first charge can be the electron. However, data show that for elements after helium, the second charge is smaller than the sum of charges on all protons in the nucleus. It turns out that the inner shell electrons (all of which are also negative) repel electrons in the outermost valence shell. The effective nuclear charge 
of a neutral atom is <em>approximately</em> the same as the number of protons minus the number of non-valence electrons. That number will be slightly larger for krypton than for bromine. As a result, the electrostatic potential energy on a 4p (the outermost orbital for both Kr and Br) electron of krypton will be more negative than that on a 4p electron in bromine. Removing that electron will take more energy in Kr than in Br. The first ionization energy of Kr is hence greater than that of Br.
Chemical reactions involve electrons and where they move (if they move).
Metal atoms (or elements) usually give away their outer shell electrons in reactions to become stabilised (creating positive ions). Non-metal atoms (or elements) usually gain electrons in order to become stable (negative ions). Some reactions involve covalent bonds, metallic bonds, ionic bonds etc., but at the base (no pun intended :D) of most chemical reactions it's just a matter of electrons moving around between atoms.
Hope it helps!
Answer:
163.2 g of Li₃PO₄ are made in the reaction
Explanation:
In first place we determine the reaction, to see stoichiometry.
The reactants are Li and Pb₃(PO₄)₂; the products are Li₃PO₄ and Pb
Equation: 6Li + Pb₃(PO₄)₂ → 2Li₃PO₄ + 3Pb
6 moles of Li can produce 2 moles of lithium phosphate
Therefore, 4.22 moles of Li will produce (4.22 . 2) / 6 = 1.41 moles of Li₃PO₄
Let's convert the amount to mass, to find the answer:
1.41 mol . 115.79 g / 1mol = 163.2 g
