The Periodic Table.

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Which one of the following elements was not easily spotted by ancient cultures?
C- Bromine(Br).
Some discoveries take centuries ande some happen in a instant. Reseach a notable discovery in a field that most interest you and explain how it unfloded

The discovery the Henning Brand,the obtainig of phosphours.

What did Hennig Brand use to try to find gold?

A- he boiled is own urine .

It is said that some chemists were able to predict the existence of some elements that were not yet  discovered. How did  they do this ?
Through experiencies .
 What was the frist element to be "discovered"?
D- Phosphours.

Pick your favorite element. Explain the reasons it sits where it does on the periodic table.

my favorite element is hydrogen because reacts much.

 is ubicated an the frits place y group

Who is known as the father of chemistry?

B-Antonie Mendelev.

Which element reacts violently with water?

D-All of the above.

• Complete the text. Use: boiled / body/ alchemist / German / gold /colour / burned / phosphorous

Hennig Brand was a -1-German -2-alchemist who lived in the 1600 (16 Hundreds). In the 17 Century alchemists wanted to extract -3-gold from the human -4- body He was sure urine had gold because of its -5- Burned He -6-boiled his own urine and finally -7- phosphorus the resulting paste at a high temperature. Smoke appeared and this paste burned violently . Brand had isolated -8-Colour from his urine. This was the first element that was isolated.

• Answer

1. Which were the elements in the “Greek Periodic Table”?
2. Why was Antoine Lavoisier important character for Chemistry?
3. How do we know him now?.

1- The elements in the Greek Periodic Table were : earth,water,air and fire.

2- Antonie Lavoisier was important because he said that an element it can not be divided by chemical means.
3-he is known as the father of chemistry

• Complete these ideas with verbs in the Passive Voice. You may need present or past tenses. Explain why.

e.g. All elements were created in the Big Bang. (create)

1. Elements _WERE__  __FROM_ and _REALESE_ into space by exploding stars. (form/release)
2. These elements _WERE  _STUDIED_ by scientists during history. (study)
3. The list of elements __WAS__  __FINDED__in the Periodic Table. (find)
4. Elements like gold, silver and copper __WERE __  __DISCOVERY__ by ancient cultures. (discover)
5. These elements _WERE__  _USE___ for jewelry and tools. (use)
6. Gold, silver and copper _CAN_  _BE_ FOUND easily. (can/find)

• Are these sentences TRUE or FALSE?

1. For Lavoisier an element cannot be separated by chemical means/methods. _T__
2. He made a short list of 2 or 3 elements. _F__
3. He divided elements into gases or metals.__T_
4. He created a complete periodic table. __F_

• Complete the table with the scientists’ names. Put them in chronological order (according to the video. Copy the correct sentences.

Scientist’s name		His contribution to science.
Jhon Dalton (D)-(G) Wolfgang Döbereiner (B)-(H) Dmitri Mendeleev (C)-(F) Hennig Brand (A) Antoine Lavoisier (E)	a-	isolated the first element.
	b-	combined elements to see how they reacted to one another.
	c-	finally organized the set of elements in the periodic table.
	d-	organized elements according to their atomic weight.
	e-	defined what an element was.
	f-	predicted elements that had not been discovered yet.
	g-	weighed elements.
	h-	discovered shared properties and reactions.

Henning Brand isolated the frist element. Wolfgang Döbereiner combined elements to see how they reacted to one another. Dmitri Mendeleev finally organized the set of elements in the periodic table. Jhon Dalton organized elements according to their atomic weight. Antonie Lavoisier defined what an element was. Dimitri Mendeleev predicted elements that had not been discovered yet . Jhon Dalton weighed elements . Wolfgang Döbereiner discovered shared properties and reactions.

• Make a list of the elements that appear on the video. Include at least 6 elements

	ELEMENT		time
e.g.	gold	Au	1:36
1-	copper	Cu	1:01
2-	silver	Ag	1:04
3-	phosphorus	P	2:21
4-	lithium	Li	3:26
5-	sodium	Na	3:26
6-	potassium	K	3:26

True or false

1. Chemistry is the science that deals with materials in laboratories. _T_
2. There is only one type of chemistry. _F_
3. Organic chemistry looks at which chemicals are in things. _T_
4. Organic chemistry looks at things that have carbon in them._T_
5. Polymer chemistry is a small area of chemistry._T_

• the elements dont have oxidation number
• All substances are gaseous
• water is a simple substance 
• sodium bicarbonate is an acidic substance 

Passive voice

• If too much reactant is used, there will be some reactants left in the chemical reaction. 
• Moles can be used to see how many molecules are in chemical compounds, too. 
• The atomic mass of an element can be used to see how much of the element makes a mole.

• Too much reactant was used.
• Chloride acid the reaction is added to the reaction
•  elements  is removed from the closet

Performance

Hi I am Victoria Lopez I am created this page with Antonella Caprile. This blog is created under the supervicion from the teacher Stella Saubidet , In the school EESTN1 of the city of Longchamps.

Us present : I am Antonella , i have sixteen years old , i like it touch the saxophone in my free time . I like very much the chemical and the practices in the laboratory, Sometimes all it is complicated but we try from to solve . I have many friends and like that.

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I am Victoria Lopez , I have sixteen years old , I am very little in comparison of the rest .I like a Hockey and handball .I like study chemical that's why the chose.
I like very much the practices in laboratory , is very funny and educational . I have few friends because almost nobody is capable the support my bad mood . Whit Antonella we are friend does 5 years fortunately we withstood.



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Concepts of chemistry

Antonella Caprile

Basic concepts

The basic unit of an element is called an atom. An atom is the smallest building block that you can cut an element into without the element breaking down (turning into a lighter element, for example through nuclear fission or radioactive decay). A chemical compound is a substance made up of two or more elements. In a compound, two or more atoms are joined together to form a molecule. The tiniest speck of dust or drop of liquid, that one can see is made up of many millions or billions of these molecules. Mixtures are substances where chemicals are mixed but not reacted. An example would be mixing sand and salt. This can be undone again to produce salt and sand separately. Chemical compounds are changed by a chemical reaction. An example would be heating sodium bicarbonate, common baking soda. It will make water, carbon dioxide, and sodium carbonate. This reaction cannot be undone.

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Mole

A mole is a very large amount of atoms (602,214,150,000,000,000,000,000 atoms). The atomic mass of an element can be used to see how much of the element makes a mole. For example, the atomic mass of copper is about 63.55. That means about 63.55 grams of copper metal has a mole of atoms. The atomic mass of chlorine is about 35.45. That means 35.45 grams of chlorine has a mole of atoms in it.

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Victoria Lopez:

Mole:Moles can be used to see how many molecules are in chemical compounds, too. Copper (II) chloride  is an example. CuCl₂is its chemical formula. There is one copper atom (63.55) and two chlorine atoms (35.45 · 2 = 70.90). Add all the molar masses of the elements together to get the molar mass of the chemical compound (63.55 + 70.90 = 134.45). That means in 134.45 grams of copper(II) chloride, there is one mole of copper(II) chloride molecules. This concept is used to calculate how much chemicals are needed in a chemical reaction if no reactants (chemicals that are reacted) should be left. If too much reactant is used, there will be some reactants left in the chemical reaction. 

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Acids and bases

Acids and bases are common chemicals. Acids release H⁺ ions when in water, and bases release OH⁻ ions when in water. Acids can react with bases. The H⁺ ion is taken from the acid by the base. This makes water, H₂O. A salt is also made when an acid and a base react together. An example would be reacting hydrochloric acid (HCl) and sodium hydroxide(NaOH). Hydrochloric acid releases H⁺ and Cl^- ions in water. The base releases Na⁺ and OH^- ions. The H⁺ and the OH^-react to make water. There is a solution of sodium chloride (NaCl) left. Sodium chloride is a salt.

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