1-Fossil fuels
1.1 Percent of energy used each year in the united states comes from fossil fuels
1.2 Coak,oil and natural gas-are a leading energy source around the world
A-Pros
1.1 When natural gas burns,it produces mostly carbon dioxide and water vapor
1.2 A especial advantage of natural gas is that it burns very cleanly
B-Cons
1.1 Also,fossil fuels(except for natural gas) pruduce pollutants
1.2 Gases released from burning fossil fuels trap more heat in earths atmosphere than would be trapped naturally.
2- Hydroeletric power
1.1 Water is widery used to produce electricity
1.2 The movement of these electrons creates an electric current
A-Pros
1.1 Dams produce a great deal of needed electricity
1.2 Dams also create many opportunities for

B-Cons

• 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-colour. He -6-boiled his own urine and finally -7-burned the resulting paste at a high temperature. Smoke appeared and this paste burned violently . Brand had isolated -8-phosphorous from his urine. This was the first element that was isolated.

• Answer

1. Which were the elements in the “Greek Periodic Table”? The elements in the "Greek Periodic Table" were: Air, Fire, Earth and Water
2. Why was Antoine Lavoisier important character for Chemistry? He said that a substance can not be divided by any chemical way. Also he created a list of the elements that in that time he known and he divided the list in gases or metals
3. How do we know him now? As the father of the 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 Vang. (create)

1. Elements ____were____  ___formed______ and ____released______ into space by exploding stars. (form/release)
2. These elements ____were____  ___studied____ by scientists during history. (study)
3. The list of elements ___is____  ___finded______in the Periodic Table. (find)
4. Elements like gold, silver and copper ___were____  ___discovered______ by ancient cultures. (discover)
5. These elements ____were____  ___used______ for jewelry and tools. (use)
6. Gold, silver and copper ___could___  _____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. _False___
3. He divided elements into gases or metals._True__
4. He created a complete periodic table. _False__
5. 
   

   
   

   Are these sentences TRUE or FALSE?

   For Lavoisier an element cannot be separated by chemical means/methods. __True_

   He made a short list of 2 or 3 elements. __False_

   He divided elements into gases or metals.__True_

   He created a complete periodic table. __False_

   
   

   
   

   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.

   
   

   
   

   
   

   John 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.

   
   

   
   

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

   .

• 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.
Wolfgang Döbereiner = b- and h- Dmitri Mendeleev = c- and f- Hennig Brand = a- Antoine Lavoisier = e- Jhon Dalton = d- and g-	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.

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

	ELEMENT	:)	time
e.g.	gold	Au	1:33
1-	Posphorous	F	2:24
2-	Calcium	Ca	3:23
3-	Magnesium	Mg	3:23
4-	Hydrogen	H	3:23
5-	Copper	Cu	1:02
	platin	Ag	1:09

• 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-colour. He -6-boiled his own urine and finally -7-burned the resulting paste at a high temperature. Smoke appeared and this paste burned violently . Brand had isolated -8-phosphorous from his urine. This was the first element that was isolated.

• Answer

1. Which were the elements in the “Greek Periodic Table”? The elements in the "Greek Periodic Table" were: Air, Fire, Earth and Water
2. Why was Antoine Lavoisier important character for Chemistry? He said that a substance can not be divided by any chemical way. Also he created a list of the elements that in that time he known and he divided the list in gases or metals
3. How do we know him now? As the father of the 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____  ___formed____ and __released____ into space by exploding stars. (form/releace)
2. These elements ___wer__  _studied__ by scientists during history. (study)
3. The list of elements ___is___ ___finded____in the Periodic Table. (find)
4. Elements like gold, silver and copper ___were____  ___discovered___ by ancient cultures. (discover)
5. These elements ____were___  ___used_____ for jewelry and tools. (use)
6. Gold, silver and copper ___could___  __be___ _found___ easily. (can/find)
7. • 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. _False__
   3. He divided elements into gases or metals._True_
   4. He created a complete periodic table. _False__
   
   
   
   • 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.
   Wolfgang Döbereiner = b- and h- Dmitri Mendeleev = c- and f- Hennig Brand = a- Antoine Lavoisier = e- Jhon Dalton = d- and g-	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.

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

   
   

   	ELEMENT		time
   e.g.	gold	Au	1:37
   1-	Posphorous	F	2:22
   2-	Calcium	Ca	3:23
   3-	Magnesium	Mg	3:22
   4-	Hydrogen	H	3:23
   5-	Copper	Cu	1:02
   6-	Silver	Ag	1:02

9. 
   Hennig Brand isolated the first element. Antoine Lavoisier defined what an element was. Dmitri Mendeleev predicted elements that had not been discovered yet. John Dalton weighed elements and organized elements according to their atomic weight. Wolfgang Döbereiner combined elements to see how they reacted to one another and discovered shared properties and reactions. Dmitri Mendeleev finally organized the set of elements in the periodic table.
   .
   
   
   
   

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

   
   
   

   	ELEMENT		time
   e.g.	gold	Au	1:37
   1-	copper	Cu	1:36
   2-	silver	Ag	1:36
   3-	phosphorous	P	2:22
   4-	sodium	Na	3:22
   5-	potassium	K	3:28
   6-	oxygen	O	1:28

:) by nico marr y lula  <3

SENTENCES IN PASSIVE VOICE

-The basic unit of an element is called an atom
-Chemical compounds are changed by a chemical reaction.
-This concept is used to calculate how much chemicals are needed in a chemical reaction

Atoms are made by electrons, protons and neutrons

MARIEL: 
Chemistry is a branch of science that deals with chemical elements and compounds, and how these things work together. It is the study of the materials (things) that make up our bodies and everything in the world around us. 

NICOLAS: 

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.

JULIAN:

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.

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.

LUCILA:

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.

jueves, 30 de junio de 2016

We are: Mariel, Nicolas, Julian and Lucila
Hello my name is Mariel Rodas. I  am 18 years old.
Julian Calderon  is 16 years old, Nicolas Ocampo  is 17 years old and Lucila Archerito is 16 years old.

We're classmates. We are studying Chemistry in the Technical School. We live in Argentina