Understanding Element is
a single substance that is chemically irreversible into another simpler
substance. Hydrogen and oxygen, for example, can not be decomposed into simpler
substances, otherwise water can be broken down by electricity into two types of
gases - hydrogen and oxygen. Some examples of elements in everyday life are
iron, aluminum, tin, gold, copper, silver, oxygen, nitrogen, sulfur and carbon.
he existence of chemical elements in the
universe are very melipah. Until now, chemical elements amount to about 114
elements. The chemical element found in the earth's crust, the ocean floor, and
the atmosphere, either in the form of free elements, compounds or mixtures
thereof. Chemical elements found in nature in its native form (not with other elements),
such as platinum (Pt), gold (Au), carbon (C), nitrogen (N2), oxygen (O2), and
gas -Gas noble. As for the other elements found in the form of metal ores. The
ore is a mixture of minerals containing chemical elements and impurities. These
minerals form of oxides, halides, phosphates, silicates, carbonates, sulfates,
and sulfites. Platinum (Pt) and gold (Au) is called precious metals. Source of
precious metals and minerals can be found in the earth's crust, while the
source of oxygen gas, nitrogen, and noble gases (except He) contained in the
layer of the atmosphere.
Naming Element
Method
The tendency of
atoms to form molecules or ions menyebabkanperlunya a notation called chemical
formula. The chemical formula of a substance containing information on the
types of elements and the number or ratio of constituent atoms of the
substance. In general, the chemical formula is expressed with the symbol of the
elements and the index number. Emblem element indicates the type of the element
while the index numbers indicate the number or the ratio of atoms of elements.
The index number is written as a subscript after the symbol of the element. The
chemical formula is divided into the molecular formula and empirical formula.
Coat Coat element elements emblem elements hydrogen (H) Sulfur (S) Oxygen (O) H
2 SO 4 Score Score index index index number H = 2 S = 1 O = 4 (not necessarily
written) Module KIM. 2 Symbol element and Reaction Equations 17 The molecular
formula of the second column in Table 3, is the molecular formula. The
molecular formula is a combination of the element symbol indicating the type of
compound-forming elements and the number of atoms of each element. For example,
sucrose having the formula C 12 H 22 O 11. The formula shows that sucrose is
composed of carbon, hydrogen, and oxygen. The formula also shows that a sugar
molecule composed of 12 carbon atoms, 22 hydrogen atoms and 11 oxygen atoms.
Vitamin C is composed of the elements C, H, O as constituent sugars, but the
number of different constituent atoms. Vitamin C has the formula C 6 H 8 O 6,
each one molecule of vitamin C m engandung 6 carbon atoms, eight hydrogen atoms
and six oxygen atoms. Although sugar and vitamin C is composed of the same
element type but have different properties, and this is because the amount of
each element in the compound is different. Urea is a fertilizer that has long
been used. Urea compound having the formula CO (NH 2) 2. The compounds of formula
can be shown that the urea is composed of the elements carbon (C), oxygen (O),
nitrogen (N) and hydrogen (H). In one molecule of urea is 1 kar bon atom, one
oxygen atom, two nitrogen atoms and four hydrogen atoms. KIM module. 2 Symbol
element and Reaction Equations 18 Table 3. Some examples of compounds molecular
formula Rumusmolekul utilities acetic acid CH 3 COOH vinegar eat Ammonia NH3
fertilizer Ascorbic acid C 6 H 8 O 6 Vitamin C Calcium carbonate CaCO 3
building materials baking soda NaHCO 3 to make bread carbon dioxide CO 2
refreshment drinks Aspirin C 9 H 8 O 4 reduces pain Magnesium hydroxide Mg (OH)
2 antidote acid floor cleaners hydrochloric acid HCl salt NaCl Sodium chloride
Sodium hydroxide NaOH.
Dryer Glucose C 6 H
12 O 6 sweetener sulfuric acid H 2 SO 4 charger akki urea CO (NH 2) 2
fertilizer empirical formula empirical formula is a chemical formula that
states comparison atoms smallest (simple). Glucose has the molecular formula
C6H12 O6dengan pe rbandingan C: H: O = 6: 12: 6. This comparison can be
simplified into C: H: O = 3: 6: 3. Such a comparison can still be further
simplified as C: H: O = 1: 2: 1. This ratio is the ratio of the smallest, so
that the empirical formula of glucose is CH2O. If a compound has a molecular
formula with a ratio of atoms that can not be further simplified, then the
empirical formula KIM Module. 2 Symbol element and Reaction Equations 19
together with the molecular formula. Examples of water H 2 O, carbon dioxide
CO2, sulfuric acid H2SO 4. Table 4menunjukkan few examples of empirical
formula. Table 4. Some examples of empirical formula Formula Name Moleklul
Comparison Comparison element atoms atoms smallest element Empirical Formula
Aspirin vinegar Butuna Butane Butene C4H8 C4H6 C4H10 C9H8O4 CH3COOH C: H = 4:
10 C: H = 4: 8 C: H = 4: 6 C: H: O = 9: 8: 4 C: H: O = 2: 4: 2 C: H = 2: 5 C: H = 1: 2 C: H = 2: 3 C: H : O = 9: 8: 4 C: H: O = 1:
2: 1 CH2 C2H5 C2H3 C9H8O4 CH2O
Specify the elemental properties of platinum
BalasHapus
BalasHapusUnder standard conditions platinum is glossy paper, silvery colors. Platinum is very elastic, which means platinum can easily stretched into a wire. Platinum is also easily formed, which means it can be ground into thin sheets.
How to distinguish specific elements? Is there any way to differentiate elements explain !
BalasHapusWhat distinguishes one element from another is the "number of protons" and the number of electrons an element or bond in the nucleus of the atom. For example, all carbon atoms have protons of 6, while oxygen atoms have 8 protons. The number of protons on an atom is known as the atomic number (denoted by Z).
HapusHowever, the atoms of the same element can have different amounts of neutrons; This is known as the isotope. The atomic mass of an element (denoted by "A") is the average mass of an elemental atom in nature. Because the mass of electrons is very small, and the mass of neutrons is almost the same as the mass of the protons, the atomic mass is usually expressed by the number of protons and neutrons in the nucleus of the atom, which is the most abundant isotope in nature. The size of the atomic mass is the unit of atomic mass (smu). Some isotopes are radioactive, and decompose (decay) against the radiation of alpha or beta particles.
The lightest elements are hydrogen and helium. Hydrogen is believed to be the first element in the universe after the Big Bang. All heavy elements are naturally formed (either naturally or artificially) through various methods of nucleosynthesis. Until 2005, known 118 elements are known, 93 elements of which are in nature, and 23 elements are artificial elements. The first artificial element is thought to be the technetium in 1937. All the artificial elements are radioactive with a short half-life, so that the naturally occurring atoms seem to have broken down.
can u explain to me about Elements of Metal,Non Metallic Elements and Elements Semi Metal?
BalasHapusMetals are elements that have shiny properties and are generally good conductor of electricity and heat conductor. Metal elements are generally solid at normal temperatures and pressures, except mercury in the form of liquid. In general, metal elements can be forged so that can be formed into other objects.
BalasHapusThe non-metallic element is an element which has no metallic properties. In general, non-metallic elements are gaseous and solid at normal temperature and pressure. Examples of non-metallic elements in the form of gases are oxygen, nitrogen, and helium. Examples of non-metallic elements in solid form are sulfur, carbon, phosphorus, and iodine. Non-metallic solids are usually hard and brittle
In addition to metal and nonmetal elements there is also a semilogam element or known as a metaloid. Metaloid is an element that has metallic and nonmetal properties. Semilogam element is usually semiconductor. What is a semiconductor? Semiconductor materials can not conduct electricity well at low temperatures, but their electrical conductivity becomes better when the temperature is higher.
how Chemical Formula One single atom can be denoted?
BalasHapus