Chemistry Alphabetical List of Elements


ImageChemistry
Alphabetical List of Elements
According to IUPAC Names
Here’s a list of the chemical elements, arranged alphabetically according to IUPAC name:
Actinium
Aluminum
Americium
Antimony
Argon
Arsenic
Astatine
Barium
Berkelium
Beryllium
Bismuth
Bohrium
Boron
Bromine
Cadmium
Calcium
Californium
Carbon
Cerium
Cesium
Chlorine
Chromium
Cobalt
Copernicium
Copper
Curium
Darmstadtium
Dubnium
Dysprosium
Einsteinium
Erbium
Europium
Fermium
Flerovium
Fluorine
Francium
Gadolinium
Gallium
Germanium
Gold
Hafnium
Hassium
Helium
Holmium
Hydrogen
Indium
Iodine
Iridium
Iron
Krypton
Lanthanum
Lawrencium
Lead
Lithium
Livermorium
Lutetium
Magnesium
Manganese
Meitnerium
Mendelevium

Mercury
Molybdenum
Neodymium
Neon
Neptunium
Nickel
Niobium
Nitrogen
Nobelium
Osmium
Oxygen
Palladium
Phosphorus
Platinum
Plutonium
Polonium
Potassium
Praseodymium
Promethium
Protactinium
Radium
Radon
Rhenium
Rhodium
Roentgenium
Rubidium
Ruthenium
Rutherfordium
Samarium
Scandium
Seaborgium
Selenium
Silicon
Silver
Sodium
Strontium
Sulfur
Tantalum
Technetium
Tellurium
Terbium
Thallium
Thorium
Thulium
Tin
Titanium
Tungsten
Ununoctium
Ununpentium
Ununseptium
Ununtrium
Uranium
Vanadium
Xenon
Ytterbium
Yttrium
Zinc
Zirconium
Top Related Searches Dubnium Bohrium Protactinium Rhenium Lanthanum Erbium

MATTER IN OUR SURROUNDINGS


As we look at our surroundings, we see a large
variety of things with different shapes, sizes
and textures. Everything in this universe is
made up of material which scientists have
named “matter”. The air we breathe, the food
we eat, stones, clouds, stars, plants and
animals, even a small drop of water or a
particle of sand– each thing is matter. We can
also see as we look around that all the things
mentioned above occupy space, that is,
volume* and have mass.
Since early times, human beings have
been trying to understand their surroundings.
Early Indian philosophers classified matter in
the form of five basic elements – the
“Panch Tatva”– air, earth, fire, sky and water.
According to them everything, living or nonliving,
was made up of these five basic
elements. Ancient Greek philosophers had
arrived at a similar classification of matter.
Modern day scientists have evolved two
types of classification of matter based on their
physical properties and chemical nature.
In this chapter we shall learn about
matter based on its physical properties.Image

NEW NOKIA LUMIA 925 PRICE IN INDIA


Image

phone (remember Nokia Catwalk) is finally ready to walk the ramp in India it seems. Nokia Lumia
925 replaced the Lumia 920 as a flagship device. Though it does not come with a camera as good
as the Nokia Lumia 1020, it is still a flagship model with all the frills.
The device comes in an aluminium body in a sleek design. The metal-finish does give the phone a
toned down look as compared to its colourful Lumia series. However, it is not the complete phone
that is aluminium. The back continues to be poly-carbonate with just an aluminium band on the
edges. The aluminium band on the side acts like the antenna and makes the phone slimmer and
lighter at just 139 grams.
Nokia Lumia 925 comes with a 4.5-inch OLED PureMotion HD+ (same as Nokia Lumia 920). The
screen is an AMOLED screen and comes with Gorilla Glass 2. The ClearBlack resolution at 768 x
1280 pixels promises better quality images and a better viewing experience.

 

Science help desk


main-chemistry

AK
3 X – Science
CHAPTER – 1
q Chemical Reaction : –Whenever a chemical change occurs we can say that
a chemical reaction has taken place
eg – Food gets digested in our body
– Rusting of iron.
q Chemical Equation :–Achemical reaction can be expressed symbolically
by using chemical equation
eg magnesium is burnt into air to form magnesium oxide can be represented
as
Mg + O2 ®MgO
– We can observe or recognise a chemical reaction by observing change
in state, colour, by evolution of gas or by change in temperature.
q Physical state of the reactant and products are mentioned to make chemical
reaction more informative. eg we use (g) for gas, (l) for liquid, (s) for solid
and (aq) for aqueous.
q Balancing Equation :– We balance the chemical equation so that no. of
atoms of each element involved in the reaction remain same at the reactant
and product side.
eg Fe + H2O ® Fe2O3 + H2 can be written as
3 Fe(s) + 4H2O(g) ® Fe2O3(s) +4H2(g)
q Combination Reaction :– The reaction in which two or more substances
combine to form a new single substance
ChemicalReactionsandEquations
AK
4 X – Science
eg CaO(s) + H2O(l) ¾¾® Ca(OH)2 (aq)
Calcium Water Calciumhydroxide
oxide (slaked lime)
Quick lime
– Ca(OH)2 slaked lime is used for white washing walls. It reacts will CO2 to
form CaCO3 and gives a shiny finish to the walls.
Ca(OH)2(aq)+ CO2(g)
¾¾® CaCO3(s)+ H2O (l)
Calcium Calcium
hydroxide Carbonate
– Burning of Coal
C(s) + O2(g) ¾¾® CO2(g) + heat + light
– Formation of water
2H2(g) + O2(g) ¾¾® 2H2O(l)
q Exothermic Reactions :– Reaction in which heat is released along with the
formation of products.
eg. CH4(g) + 2O2(g) ¾¾®CO2(g) + 2H2O(g)
– Respiration is also exothermic reaction.
– De composition of vegetable matter into compost.
q De compositon Reactions :– The reaction in which a single substance
decomposes to give two or more substances. De composition reactions can
be of three types
Thermal Decompositon :–When a decompositon reaction is carried out by
heating
AK
5 X – Science
– Silver bromide behaves similarly
2Ag Br ¾¾Su¾nl¾igh¾t¾® 2Ag(s) + Br2(g)
– The above two reactions are used in black and white photography.
AK
6 X – Science
– Endothermic Reactions – The reactions which require energy in the form
of heat, light or electricty are called Endothermic Reactions.
2Ba(OH)2 + NH4Cl ¾¾® 2BaCl2 + NH4OH
– Displacement Reaction : The chemical Reaction in which an element
displaces another element from its solution
Fe(s) + CuSO4(aq) ¾¾® FeSO4 + Cu(s)
Copper (aq)
Sulphate Iron Sulphate
– The nail becomes brownish in colour and the blue colour of Copper Sulphate
solution fade.
– Other examples Zn(s) + CuSO4 ¾¾® ZnSO4 + Cu(s)
(aq) (aq)
Copper Zinc
Sulphate Sulphate
Pb(s) + CuCl2 ¾¾® PbCl2 + Cu(s)
(aq) (aq)
Copper Lead
Chloride Chloride
– Zinc and lead are more reactive elements than copper. They displace copper
from its compounds.
AK
7 X – Science
– Double Displacement Reaction : The reaction in which two different atoms
or group of atoms are mutually exchanged
eg. Na2 SO4 + BaCl2 ¾¾® BaSO4(s) + 2NaCl
(aq) (aq) (aq)
Sodium Barium Barium Sodium
Sulphate Chloride Sulphate Chloride
A white substance is formed due to above reaction. The insoluble substance
is called precipitate.
Precipitation Reaction –Any reaction that produces a precipitate is called a
precipitation reaction.
eg. Pb(NO3)2 + 2KI ¾¾® PbI2  +2KNO3
(aq) (aq) (aq)
Lead Nitrate Potassium Lead Potassium
Iodide Iodide Nitrate
– Oxidation : Oxidation is the gain of oxygen or loss of hydrogen
eg. 2Cu + O2 ¾¾He¾at¾® 2CuO
When Copper is heated a black colour appears. If this CuO is reacted with
hydrogen gas then again Cu becomes brown as reverse reaction takes place
CuO + H2 ¾¾He¾at¾® Cu + H2O
– Reduction : Reduction is the loss of oxygen or gain of hydrogen.
– Redox Reaction : The reaction in which one reactant gets oxidised while
other gets reduced
eg. ZnO + C ¾¾® Zn + CO
MnO2 + 4HCl ¾¾® MnCl2 + 2H2O + Cl2
AK
8 X – Science
– Corrosion : When a metal is attacked by substances around it such as
moisture, acids etc.
eg. Reddish brown coating on iron.
(ii) Black coating on Silver.
– Rancidity : When fats and oils are oxidised they become rancid and their
smell and taste change.
– Antioxidants are added to foods containing fats and oil.
EXERCISE
(Question Bank)
(1 Mark)
Answer the following questions very breifly
1. What happens when the milk is left at room temperature during summer?
2. Write a chemical equation when magnesium is burnt in air to give magnesium
oxide.
3. A substance under goes chemical reactions to produce simpler products,
what type of reaction is this?
4. Why do copper vessels lose their shine when exposed to air?
5. Which gas is produced by the action of dilute hydrochloric acid on zinc
granules?
6. Fe2O3 + 2Al ¾¾® Al2O3 + 2Fe
The above reaction is an example of which type of reaction.
7. Name the type of reaction in which energy is absorbed.
8. Why does the colour of copper sulphate solution change when an iron nail is
dipped into it?
9. Give an example of decomposition reaction which proceeds by absorbing
electric energy.
10. Why do we balance the chemical equation?
AK
9 X – Science
Answer the following questions briefly (2 mark)
1. Write down the observations which indicate the occurence of a chemical
reaction.
2. Why is respiration considered as an exothermic reaction? Explain.
3. Transfer the following statements into Chemical equations and then balance
them.
a) Hydrogen gas combines with nitrogen to form ammonia.
b) Potassium metal reacts with water to give potassium hydroxide and
hydrogen gas.
4. Identify the substances that are oxidised and the substances that are reduced
to the folllowing reactions.
1. Na + O2 ¾¾® Na2O
(s) (g) (s)
CuO + H2 ¾¾® Cu + H2 O(l)
(s) (g) (s)
5. What happens when silver chloride is exposed to sunlight? Give one practical
application of this reaction.Write the equation also.
6. Why is the bag used for potato chips flushed with nitrogen gas?
Answer the following questions in detail (3 marks)
1. Write down the balanced chemical equations for the following reactions.
a) Zinc Carbonate(s) ¾¾® Zinc Oxide + Carbon Dioxide(g)
b) Aluminium(s) + Chlorine(g) ¾¾® AluminiumChloride(s)
c) Magnesium(s)+Water(l) ¾¾He¾at¾® MagnesiumHydroxide(l)+Hydrogen(g)
2. Choose combination, displacement and double displacement reactions out of
the given reactions.
i) MnO2(s)
+ 4HCl(l) ¾¾®MnCl2(s)
+ Cl2(g)
+ 2H2O
(l)
ii) CaO
(s)
+ CO2(g)
¾¾® CaCO3(s)
iii) 2AgCl(s) ¾¾® 2Ag(s) + Cl2(g)
AK
10 X – Science
3. What happens when CO2(g)
is passed through slaked lime?Write the balanced
chemical equation.Write the type of reaction that has occured.
Explain the following questions detail (5 marks)
1. Balance the following chemical equation and identify the type of reaction they
represent
KClO3 ¾¾® KCl + O2
NH3 + O2 ¾¾® NO + H2O
Na2O + H2O ¾¾® NaOH
Na + H2O ¾¾® NaOH + H2
FeCl3 + NaOH ¾¾® Fe (OH)3 + NaCl.
2. Define various types of chemical reactions.Write one chemical equation for
each type.