Compare: is a level that emphasizes equations. Equations can be used to express the similarity
of two
or more objects. Some words used to express an equation are:
- Like
- Same
- The same as
- Similar
Word by
Word Definitions
Compareplay
to represent as similar : liken, to examine the character or qualities of
especially in order to discover resemblances or differences, to view in relation to, the possibility of comparing, something with
which to be compared
Contrast: Is a level that focuses on differences. Shows a marked
difference when compared: his actions - in his words, show real differences (in
terms of color, appearance, size, etc.). Some words used to express a
difference are
- Difer
- However
- unlike
- while
- but
Example: Bikes and motorcycles are the means of
transportation used by a person to achieve a goal. Bicycles have two-wheeled
traits, no machines, human-driven, no pollution. While the two-wheeled
motorcycle, has a machine, powered by using engine power, and cause pollution.
So the similarities and differences of the two objects are:
compare: same as means of transportation
contrast: if the bike uses human power and does not remove pollution if the motor uses engine power
and pollution
In chemistry, we can compare the similarities and differences of each element in the periodic table.
The similarities and differences between elements Cl and He
Chloros, "pale green"), is a chemical element with the symbol Cl and atomic number 17.
In the periodic table, this element belongs to the halogen group or group 17 (the old system: VII
or VIIA). In the form of chloride ions, these are the salt-formers and other compounds available in
nature in abundant quantities and are necessary for the formation of almost all life forms, including
humans. In the form of gas, chlorine is greenish yellow, and very poisonous. In liquid or solid form,
chlorine is often used as an oxidant, bleach, or disinfectant.
Helium is a chemical element in the periodic table that has the symbol He and the atomic number 2.
Helium is colorless, odorless, tasteless, non-toxic, almost inert, a monatomic gas, and is the first element in the noble gas group in the periodic table. The boiling point and melting point of this gas is the lowest among all elements. Helium materialized only as a gas except in very
extreme conditions.
Explain how Cl is made!
BalasHapusIn chlorine industry made electrolysis of NaCl solution.
HapusCathode
:
2H2O (l) + 2e- → H2 (aq) + 2OH- (aq)
Anode
:
2Cl- (aq) → Cl2 (aq) + 2e-
+
2H2O (l) + 2Cl- (aq) → H2 (g) + 2OH- (aq) + Cl2 (g)
In chlorine laboratories are prepared by oxidizing Cl- ions from NaCl with oxidizing agents, for example KMnO4 + H2SO4.
Reaction:
(Aq) + 8H2O (l) + 5Cl2 (aq) + 5H2SO4 (aq) + 10NaCl (aq) → 5Na2SO4 (aq) + K2SO4 (aq) + 2MnSO4 (aq) + 8H2O (l) + 5Cl2 (g)
Or by reacting MnO 2 with HCl.
MnO2 + 4HCl → MnCl2 + 2H2O + Cl2
Why is helium non-toxic ?. Try to explain.
BalasHapusHi Nida 👋, can you explain how helium is made?
BalasHapusHow to make helium
Hapus1. Extraction of Helium (He) from natural gas
Natural gas contains hydrocarbons and substances such as CO2, water vapor, He, and other impurities. To extract He from natural gas, the process of condensation (liquefaction) is used. In the early stages, CO2 and water vapor are first separated (This is because in the condensation process, CO2 and moisture can form solids causing pipe blockage). Then, the natural gas is condensed at a temperature below the hydrocarbon condensation temperature but above the condensation temperature of He. Thus, the product obtained is a gas mixture containing 50% He, N2, and other impurities. Next, He is purified by a process including:
· Cryogenic process (cryogenic means to produce cold). The gas mixture is pressurized, then cooled rapidly to allow N2 to condense so that it can be separated, the residual mixture passed through activated charcoal which will absorb the impurities so as to obtain a very pure Heat.
· The adsorption process. The gas mixture is passed through an adsorbent bed which selectively absorbs impurities. This process produces He with a purity of 99.997% or more.
Where can we find elements of Cl and He?
BalasHapus
HapusChlorine can be found in large quantities in the earth's crust and seawater. At sea, chlorine is found as part of a sodium chloride (NaCl) compound, also known as table salt. In the earth's crust, the most common minerals containing chlorine include halit (NaCl), carnallite, and silvite (KCl).
Helium is quite rare on Earth. There is very little in the atmosphere of the earth because it is so light that it eventually passes into space.
Scientists believe that most of the helium in the universe was created in the formation of the universe. However, new helium is made at the center of the star and also as part of radioactive decay on Earth. Helium from radioactive decay can be found underground trapped in natural gas reservoirs.
What are the differences of the elements of ce and he in chemical properties?
BalasHapusCl is diatomic, he is monoatomic.
HapusCl is very reactive, he is not reactive
Is it just that you explain above the difference and the equation of Cl and He? If anyone else please explain
BalasHapusYes, the specific difference is only that where cl is toxic, whereas He is not toxic, reactive, He is not reactive, cl has atomic number 17 He 2, diatomic gas cl whereas He gas monoatomy
Hapus