CHAPTER 1: INTRODUCTION TO CHEMISTRY
... The atomic weight (the number below the element symbol) is used by subtracting the number of protons from it (the atomic number) and equaling the number of neutrons Ex: Carbon’s is 12 so 12-- 6= 6 so carbon has six neutrons. ...
... The atomic weight (the number below the element symbol) is used by subtracting the number of protons from it (the atomic number) and equaling the number of neutrons Ex: Carbon’s is 12 so 12-- 6= 6 so carbon has six neutrons. ...
Atomic Theories Notes
... - To explain his results, he came up with the nuclear model: 1) An atom has a tiny, dense, positive core called the _____________ (which deflected the alpha particles and contains ___________________) 2) The nucleus is surrounded mostly by empty space, containing rapidly moving negative ____________ ...
... - To explain his results, he came up with the nuclear model: 1) An atom has a tiny, dense, positive core called the _____________ (which deflected the alpha particles and contains ___________________) 2) The nucleus is surrounded mostly by empty space, containing rapidly moving negative ____________ ...
HW Problems
... and the chapter. Problems must be identified by number and all work must be shown with answers boxed. Be sure your handwriting is legible. An example is posted in the ‘course basics’ section of our Moodle page. Dalton’s atomic theory 1. Hydrogen sulfide is composed of two elements: hydrogen & sulfur ...
... and the chapter. Problems must be identified by number and all work must be shown with answers boxed. Be sure your handwriting is legible. An example is posted in the ‘course basics’ section of our Moodle page. Dalton’s atomic theory 1. Hydrogen sulfide is composed of two elements: hydrogen & sulfur ...
The Chemical Basis of Life
... Chemical bonding occurs when two or more atoms combine Atoms combine by exchanging or sharing electrons in their outermost electron shell Chemical compound – Formed when the atoms of two or more different elements combine by chemical bonding – Properties of a compound are usually very different than ...
... Chemical bonding occurs when two or more atoms combine Atoms combine by exchanging or sharing electrons in their outermost electron shell Chemical compound – Formed when the atoms of two or more different elements combine by chemical bonding – Properties of a compound are usually very different than ...
Webquest - Atomic Theories File
... Early Ideas About Atoms: Go to http://galileo.phys.virginia.edu/classes/252/atoms.html and read the section on “Early Greek Ideas” in order to answer the following questions: 4. What was the “basic idea” about matter that Leucippus and Democritus proposed? ...
... Early Ideas About Atoms: Go to http://galileo.phys.virginia.edu/classes/252/atoms.html and read the section on “Early Greek Ideas” in order to answer the following questions: 4. What was the “basic idea” about matter that Leucippus and Democritus proposed? ...
Ch. 2 - Ltcconline.net
... 2. Define matter, an element, and a trace element. 3. Define a compound and explain how compounds in living organisms are different from compounds in nonliving things. 4. Describe the structure of an atom. 5. Distinguish between atomic number and atomic weight or mass number of an atom. 6. Define an ...
... 2. Define matter, an element, and a trace element. 3. Define a compound and explain how compounds in living organisms are different from compounds in nonliving things. 4. Describe the structure of an atom. 5. Distinguish between atomic number and atomic weight or mass number of an atom. 6. Define an ...
What is Matter?
... – Made up of Sodium (Na) and Chlorine (Cl) • Na – soft metal that explodes when combined with water • Cl – poisonous gas ...
... – Made up of Sodium (Na) and Chlorine (Cl) • Na – soft metal that explodes when combined with water • Cl – poisonous gas ...
What is an atom?
... The number of protons and electrons an atom has is unique to each element • That is to say, every element has a different number of protons in its atom • Coincides with the atomic number Even though atoms contain charged particles, they are ...
... The number of protons and electrons an atom has is unique to each element • That is to say, every element has a different number of protons in its atom • Coincides with the atomic number Even though atoms contain charged particles, they are ...
Chemical Reactions
... Mass states that the amount of matter in the universe is constant – This means that you can’t really ever destroy or create anything, you just change it from one form to another! ...
... Mass states that the amount of matter in the universe is constant – This means that you can’t really ever destroy or create anything, you just change it from one form to another! ...
The Story Behind Atomic Theory
... indivisible and unchangeable. In fact, he decided to call them atomos, which means uncuttable in Greek. Although these atomos are all made up of the same matter, their shape, size, and orientation in space explains the existence of different substances and materials. While most of Democritus’ ideas ...
... indivisible and unchangeable. In fact, he decided to call them atomos, which means uncuttable in Greek. Although these atomos are all made up of the same matter, their shape, size, and orientation in space explains the existence of different substances and materials. While most of Democritus’ ideas ...
Atomic Theory Booklet - hrsbstaff.ednet.ns.ca
... indivisible and unchangeable. In fact, he decided to call them atomos, which means uncuttable in Greek. Although these atomos are all made up of the same matter, their shape, size, and orientation in space explains the existence of different substances and materials. While most of Democritus’ ideas ...
... indivisible and unchangeable. In fact, he decided to call them atomos, which means uncuttable in Greek. Although these atomos are all made up of the same matter, their shape, size, and orientation in space explains the existence of different substances and materials. While most of Democritus’ ideas ...
the Note
... J.J. Thomson discovered a negatively charged particle in 1897. This particle was named the electron. Thomson saw the atom as a plum pudding, having electrons spread throughout the sphere and some sticking out at the surface. Thomson’s plum pudding model Electron Sphere of positive charge He thought ...
... J.J. Thomson discovered a negatively charged particle in 1897. This particle was named the electron. Thomson saw the atom as a plum pudding, having electrons spread throughout the sphere and some sticking out at the surface. Thomson’s plum pudding model Electron Sphere of positive charge He thought ...
Atoms, Elements, and Ions
... Who: John Dalton What: Solid Sphere Model (1st atomic theory) •Elements are made up of indivisible particles called atoms •Each element was composed of the same kind of atoms. •Different elements were composed of different kinds of atoms. •Compounds are composed of atoms in specific ratios. •Atoms ...
... Who: John Dalton What: Solid Sphere Model (1st atomic theory) •Elements are made up of indivisible particles called atoms •Each element was composed of the same kind of atoms. •Different elements were composed of different kinds of atoms. •Compounds are composed of atoms in specific ratios. •Atoms ...
History of the Atom
... indivisible and indestructible particles made of a single material formed into different shapes and sizes. • Aristotle did not support his atomic theory Image taken from: https://reichchemistry.wikispaces.com/T.+Glenn+ Time+Line+Project ...
... indivisible and indestructible particles made of a single material formed into different shapes and sizes. • Aristotle did not support his atomic theory Image taken from: https://reichchemistry.wikispaces.com/T.+Glenn+ Time+Line+Project ...
John Dalton - SchoolRack
... Thomson built a cathode ray tube ending in a pair of metal cylinders with a slit in them. These cylinders were in turn connected to an electrometer. He wanted to see if, by bending the rays with a magnet, he could separate the charge from the rays. He found that when the rays entered the slit in the ...
... Thomson built a cathode ray tube ending in a pair of metal cylinders with a slit in them. These cylinders were in turn connected to an electrometer. He wanted to see if, by bending the rays with a magnet, he could separate the charge from the rays. He found that when the rays entered the slit in the ...
Answer Key to Chem Semester 1 Exam Review
... B. Atoms of each element have their own characteristic mass, so compounds consisting of these atoms always have the same composition by mass. C. Only whole atoms combine in chemical compounds, so different compounds between the same two elements must result from the combo of different whole numbers ...
... B. Atoms of each element have their own characteristic mass, so compounds consisting of these atoms always have the same composition by mass. C. Only whole atoms combine in chemical compounds, so different compounds between the same two elements must result from the combo of different whole numbers ...
History of the Atom
... “They reasoned that the solidness of the material corresponded to the shape of the atoms involved. Thus, iron atoms are solid and strong with hooks that lock them into a solid; water atoms are smooth and slippery; salt atoms, because of their taste, are sharp and pointed; and air atoms are light and ...
... “They reasoned that the solidness of the material corresponded to the shape of the atoms involved. Thus, iron atoms are solid and strong with hooks that lock them into a solid; water atoms are smooth and slippery; salt atoms, because of their taste, are sharp and pointed; and air atoms are light and ...
The parts of Dalton`s theory Matter is composed of small, chemically
... RATIO of water and oxygen would form: ...
... RATIO of water and oxygen would form: ...
History of the Atom
... “They reasoned that the solidness of the material corresponded to the shape of the atoms involved. Thus, iron atoms are solid and strong with hooks that lock them into a solid; water atoms are smooth and slippery; salt atoms, because of their taste, are sharp and pointed; and air atoms are light and ...
... “They reasoned that the solidness of the material corresponded to the shape of the atoms involved. Thus, iron atoms are solid and strong with hooks that lock them into a solid; water atoms are smooth and slippery; salt atoms, because of their taste, are sharp and pointed; and air atoms are light and ...
The Chemical Context of Life
... outermost shell (valence shell) An element is stable when its valence shell is full ...
... outermost shell (valence shell) An element is stable when its valence shell is full ...
With Atoms
... – An attractive force that arises between two atoms when their electrons interact ...
... – An attractive force that arises between two atoms when their electrons interact ...
History of molecular theory
In chemistry, the history of molecular theory traces the origins of the concept or idea of the existence of strong chemical bonds between two or more atoms.The modern concept of molecules can be traced back towards pre-scientific Greek philosophers such as Leucippus who argued that all the universe is composed of atoms and voids. Circa 450 BC Empedocles imagined fundamental elements (fire (20px), earth (20px), air (20px), and water (20px)) and ""forces"" of attraction and repulsion allowing the elements to interact. Prior to this, Heraclitus had claimed that fire or change was fundamental to our existence, created through the combination of opposite properties. In the Timaeus, Plato, following Pythagoras, considered mathematical entities such as number, point, line and triangle as the fundamental building blocks or elements of this ephemeral world, and considered the four elements of fire, air, water and earth as states of substances through which the true mathematical principles or elements would pass. A fifth element, the incorruptible quintessence aether, was considered to be the fundamental building block of the heavenly bodies. The viewpoint of Leucippus and Empedocles, along with the aether, was accepted by Aristotle and passed to medieval and renaissance Europe. A modern conceptualization of molecules began to develop in the 19th century along with experimental evidence for pure chemical elements and how individual atoms of different chemical substances such as hydrogen and oxygen can combine to form chemically stable molecules such as water molecules.