https://padlet.com/19dsangren/unit2chem Drew Sangren Alani Nguyen per.2 en-us 2016-10-25 16:34:06 UTC 2025-11-02 21:35:33 UTC hello@padlet.com 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134131143 There were 3 scientists who contributed to the development of the atom ]]> 2016-10-31 03:03:23 UTC https://padlet.com/19dsangren/unit2chem/wish/134131143 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134131320 1. Atoms cannot be created or destroyed in a chemical reaction
2. All elements are composed of atoms 
3. Compounds are composed of different elements.
4. Atoms of different elements are different 
5. Atoms of the same element are identical.]]> 2016-10-31 03:07:15 UTC https://padlet.com/19dsangren/unit2chem/wish/134131320 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134131603 In his experiment, Dalton discovered that different substances can be made  with the exact same reactants that were used before.

                Other Results 
-Law of Conservation
Mass of the reactants should equal to the mass of the products.
-Law of Multiple Proportions 
If you use the same substance the number that it is divisible by has to be the same.

]]> 2016-10-31 03:13:16 UTC https://padlet.com/19dsangren/unit2chem/wish/134131603 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134131958 JJ Thomson used a cathodray tube that had both positive and negative electros on each side, and a current run right between the tube. The results of his experiment led to particles that were negatively charged, later known has electrons. JJ Thomson's experiment was named the Plum Pudding Model, with the electrons representing as the plums.]]> 2016-10-31 03:20:15 UTC https://padlet.com/19dsangren/unit2chem/wish/134131958 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134132518 2016-10-31 03:29:08 UTC https://padlet.com/19dsangren/unit2chem/wish/134132518 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134132589 Rutherford had an experiment that used gold foil to discover positive charged particles. To do this he shot alfoparticles at a piece of gold foil. Most of them went right through without being deflected and others scattered and came back.The results of this experiment was the discovery of the nucleus.]]> 2016-10-31 03:30:14 UTC https://padlet.com/19dsangren/unit2chem/wish/134132589 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134133690 Atoms make up everything around us and make up matter.]]> 2016-10-31 03:45:19 UTC https://padlet.com/19dsangren/unit2chem/wish/134133690 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134135124 The relative mass of an electron is 0 because the absolute mass is very small compared to the absolute mass of both protons and neutrons.]]> 2016-10-31 04:07:11 UTC https://padlet.com/19dsangren/unit2chem/wish/134135124 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134135361 The arrangement of atoms are determined by their physical and chemical properties.]]> 2016-10-31 04:09:23 UTC https://padlet.com/19dsangren/unit2chem/wish/134135361 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134135631 Mass Number: The mass number is the total number of protons and neutrons in the nucleus of the atom. It is not represented on the periodic table

Atomic Mass: The Atomic Mass is the average of the mass number of all isotopes. 

Atomic Number: The Atomic Number is the number of protons an element has. If an element is neutral, then the Atomic Number also can tell you how many electrons there are as well.]]> 2016-10-31 04:12:04 UTC https://padlet.com/19dsangren/unit2chem/wish/134135631 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134273032 To complete a compound formula, you first need a subscript. A subscript is a small number below and to the right of an atom. The number represents how many of that atom are connected in a molecule. The next thing you need is a Coefficient. A Coefficient is the large number in front of an atom or molecule. It also tells you the number of copies it contains. Every atom alone or combined in a molecule has only one capitol letter for example Ca. 

]]> 2016-10-31 16:03:25 UTC https://padlet.com/19dsangren/unit2chem/wish/134273032 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134278050 2016-10-31 16:16:57 UTC https://padlet.com/19dsangren/unit2chem/wish/134278050 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134278768 Isotopes are atoms of an element with the same number of protons and different number of neutrons and mass number.]]> 2016-10-31 16:18:57 UTC https://padlet.com/19dsangren/unit2chem/wish/134278768 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134280129 When writing an Isotope, there must be a subscript on the bottom left side, which tells you the atomic number and the number of protons and electrons. There also must be a number on the top left, which is referred as the superscript. The superscript provides the mass number, which is the number of protons and neutrons combined. 

When you write the name of the Isotope you write the name of the element followed by a dash, and then put the mass number. ]]> 2016-10-31 16:22:38 UTC https://padlet.com/19dsangren/unit2chem/wish/134280129 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134283420 The periodic table lists all of the known elements in order of their atomic # and in columns that depend on similarities in their chemical and physical properties. 

Vertical Column= group (families)
Horizontal Row= period


]]> 2016-10-31 16:31:32 UTC https://padlet.com/19dsangren/unit2chem/wish/134283420 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134285067 2016-10-31 16:35:42 UTC https://padlet.com/19dsangren/unit2chem/wish/134285067 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134286015 Alkali Metals- group 1 
Alkaline Earth Metals- group 2
Transition Metals- group 3-11
Halogens- group 17
Noble Gases- group 18 
Lanthanides
Actinides ]]> 2016-10-31 16:38:20 UTC https://padlet.com/19dsangren/unit2chem/wish/134286015 19dsangren https://padlet.com/19dsangren/unit2chem/wish/134288046 Metals: 
-Metals are located in the left hand center
-Good conductors of heat and electricity, malleable, ductile, lustrous, and mostly solid at room temperature

Nonmetals: 
-Nonmetals are located in the upper right hand corner 
- Poor conductors of heat and electricity 
-They lack most properties of metals

Metalloids:
-Metalloids are six elements on a diagonal line
-Called semimetals or semiconductors because their conductivity is between that of metals and nonmetals. 
-


]]> 2016-10-31 16:43:48 UTC https://padlet.com/19dsangren/unit2chem/wish/134288046 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134934614 Diatomic Molecules are composed of two of the same atoms bonded together. On the Periodic Table, the diatomic molecules can be found in "Super Seven."]]> 2016-11-02 20:50:07 UTC https://padlet.com/19dsangren/unit2chem/wish/134934614 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134974352 2016-11-03 03:02:11 UTC https://padlet.com/19dsangren/unit2chem/wish/134974352 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134974637 An ion is an atom or a molecule which the number of electrons is not equal to the number of protons, giving the atom or molecule a positive or negative charge. It forms when atoms gain or loose an electron. Also, cations have a positive charge, and anions carry a negative charge.]]> 2016-11-03 03:05:56 UTC https://padlet.com/19dsangren/unit2chem/wish/134974637 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134976651 2016-11-03 03:31:48 UTC https://padlet.com/19dsangren/unit2chem/wish/134976651 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134976868 An ionic compound is a chemical compound made of ions held together by electrostatic forces. The overall charge of the compound is neutral, but consists of cations (positive charge) and anions (negative charge). In the ionic compound name, the metal is named first and the nonmetal is second and the ending changes ide. To find the ionic formula- ___(# of metals)(charge +) + ___(# of nonmetals)(charge -)=0]]> 2016-11-03 03:34:47 UTC https://padlet.com/19dsangren/unit2chem/wish/134976868 19anguyen47 https://padlet.com/19dsangren/unit2chem/wish/134977070 2016-11-03 03:37:18 UTC https://padlet.com/19dsangren/unit2chem/wish/134977070