We can measure the properties of several unknown solids by some of the characteristics :
Covalent.
Ionic.
Metallic.
Network covalent.
<span>covalent bonds are weaker than ionic and create molecular compounds. these have low melting and boiling points.
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<span>ionic compounds are very strong bonds, it takes a lot of energy to melt and boil these compounds. these are brittle compounds.
</span>metallic bonds are found in metals, of course. these are described as "sea of electrons" because the valence elctrons of each metal atom can freely move between the metal atoms in the crystal. this is what allows for electric conductivity in metals, the easy flow of electrons through the metal.
<span>network covalent are covalent bonds. the are different from covalent bonds because they are much stronger bonds. a diamond is made only of C. one sees in other compounds that carbon bonds are covalent and weaker than ionic. in a diamond, the C atoms are in a network of covalent bonds and, as we see everyday, graphite, also only carbon, is so weakly held together that we can rub the tip of a pencil and the C comes off on our hands</span>
Answer: Polarity is the dipole-dipole intermolecular forces between the slightly positively-charged end of one molecule to the negative end of another or the same molecule
An example is H2+ (SO4)2- in Tetraoxosulphate (VI) Acid
Explanation:
In the acid H2SO4, ionization results in the formation of a Positively charged hydrogen ion (2H+) and a negatively charged Sulphate ion (SO4)2-
The slightly positive and negative parts in the ACID generates the DIPOLE (two poles) and THUS explains polarity
The concentration of each of the individual ions in a 0750 M Ba(OH)2 solution is
[Ba2+] = 0.750 M
[OH-]= 1.50 M
<h3>
calculation</h3>
write the equation for dissociation
that is Ba(OH)2 (s)→ Ba2+(aq) + 2OH-(aq)
by use of mole ratio of Ba(OH)2 : Ba2+ which is 1: 1 the concentration of Ba2+ is therefore= 0.750M
by use of mole ratio of Ba(OH)2 : OH- which is 1:2 the concentration of OH- =0.750 M x2/1=1.50 M
Answer:
Dmitri Mendeleev
Explanation:
Dmitri Mendeleev published the first recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct
Answer:
K2 = 9.701 x 10^-10
Explanation:
K1 = 4.0 x 10^-5
K2 = ?
T1 = -10.8 °C +273 = 262.2K
T2 = -16 °C + 273 = 257K
ΔHrxn = 120. kJ/mol = 120000 J/mol
The formular relating all these parameters is given as;
ln( K2 / K1) = −ΔHrxn / R * (1 / T2 − 1 / T1)
ln (K2 / 4.0 x 10^-5) = - 120000 / 8.314 (1 / 257 - 1 / 262.2)
ln (K2 / 4.0 x 10^-5) = 1.1138
ln K2 - ln4.0 x 10^-5 = 1.1138
ln K2 = 1.1138 + ln4.0 x 10^-5
ln K2 = 1.1138 - 10.1266
ln K2 = -9.0128
K2 = 9.701 x 10^-10