Directions: Read the article below. For each section (in bold), write 2
... stream of alpha particles at a thin sheet of gold foil. Their hypothesis was that the alpha particles would pass through the gold foil with minimal deflection, since mass and charge are distributed uniformly throughout an atom, as proposed by Thomson. The data did not agree with this assumption. Som ...
... stream of alpha particles at a thin sheet of gold foil. Their hypothesis was that the alpha particles would pass through the gold foil with minimal deflection, since mass and charge are distributed uniformly throughout an atom, as proposed by Thomson. The data did not agree with this assumption. Som ...
Overview Properties of Atoms and the Periodic Table
... 8. The unit of measurement used for atomic particles is the (atom size/atomic mass unit). 9. Atoms of the same element that have different numbers of neutrons are called (isotopes/electron clouds). 10. In the periodic table, elements are arranged by increasing atomic (power/number). 11. An electron ...
... 8. The unit of measurement used for atomic particles is the (atom size/atomic mass unit). 9. Atoms of the same element that have different numbers of neutrons are called (isotopes/electron clouds). 10. In the periodic table, elements are arranged by increasing atomic (power/number). 11. An electron ...
Chapter 3 - WordPress.com
... • In 1911, Rutherford and his coworkers at the University of Manchester, England, directed a narrow beam of alpha particles at a very thin sheet of gold foil. • Based on Thomson’s model of the atom he expected the alpha particles to pass through the foil but not all did! ...
... • In 1911, Rutherford and his coworkers at the University of Manchester, England, directed a narrow beam of alpha particles at a very thin sheet of gold foil. • Based on Thomson’s model of the atom he expected the alpha particles to pass through the foil but not all did! ...
Chemistry Post-Enrolment Worksheet C
... Section 3 – Balancing Chemical Equations To represent a chemical reaction we could write a word or symbol equation. At A level, you will be expected to interpret, construct and balance symbol equations. ...
... Section 3 – Balancing Chemical Equations To represent a chemical reaction we could write a word or symbol equation. At A level, you will be expected to interpret, construct and balance symbol equations. ...
Summary of Chapter 2
... Democritus (460–370 BC): All matter can be divided into indivisible atomos. Dalton: proposed atomic theory with the following postulates: • Elements are composed of atoms. • All atoms of an element are identical. • In chemical reactions atoms are not changed into different types of atoms. Atoms are ...
... Democritus (460–370 BC): All matter can be divided into indivisible atomos. Dalton: proposed atomic theory with the following postulates: • Elements are composed of atoms. • All atoms of an element are identical. • In chemical reactions atoms are not changed into different types of atoms. Atoms are ...
+ 2 HCL(aq) CaCl2(aq) + H2O(l) + CO2(g)
... Subscript: A number that represents how many atoms of an element are in a compound. Compound: A substance made of the combined atoms of two or more elements. Chemical Formula: States what elements a compound contains and the exact number of atoms of these elements. Oxidation Number: positive or nega ...
... Subscript: A number that represents how many atoms of an element are in a compound. Compound: A substance made of the combined atoms of two or more elements. Chemical Formula: States what elements a compound contains and the exact number of atoms of these elements. Oxidation Number: positive or nega ...
Chemistry Test #1 Study Guide © Chris Khan
... through the foil or slightly deflected, but every now and then, an alpha particle actually bounced back (!)—this was a very surprising finding; Rutherford was then able to propose that there must be a nucleus, or a dense central core in the atom—the positively charged particles in the nucleus are pr ...
... through the foil or slightly deflected, but every now and then, an alpha particle actually bounced back (!)—this was a very surprising finding; Rutherford was then able to propose that there must be a nucleus, or a dense central core in the atom—the positively charged particles in the nucleus are pr ...
Chapter 2 – Atoms and Elements
... e.g. The chemistry of beer Beer is a homogeneous mixture consisting of water (_____), ethanol (___________), carbon dioxide (_____) and a variety of other substances responsible for its flavour. Beer is made in a multi-step process:1 1. Barley mash is heated with water. This activates enzymes in the ...
... e.g. The chemistry of beer Beer is a homogeneous mixture consisting of water (_____), ethanol (___________), carbon dioxide (_____) and a variety of other substances responsible for its flavour. Beer is made in a multi-step process:1 1. Barley mash is heated with water. This activates enzymes in the ...
Accelerated Chemistry
... 10.1 The Mole: A Measurement of Matter Atoms are tiny, so we count them in “bunches” - a mole is a “bunch of atoms” mole (definition) - The amount of a compound or element that contains 6.02 x 1023 particles of that substance. 1 mole = 1 molar mass = 6.02 x 1023 particles Avagadro’s Number = 6.02 x ...
... 10.1 The Mole: A Measurement of Matter Atoms are tiny, so we count them in “bunches” - a mole is a “bunch of atoms” mole (definition) - The amount of a compound or element that contains 6.02 x 1023 particles of that substance. 1 mole = 1 molar mass = 6.02 x 1023 particles Avagadro’s Number = 6.02 x ...
Chemistry--Chapter 5: Atomic Structure and the Periodic Table
... In contrast, the negatively charged ________________(12) occupy most of the volume of the atom. The number of ________________(13) in the nucleus of an atom is the atomic ________________(14) of that element. Because atoms are electrically neutral, the number of protons and ________________(15) in a ...
... In contrast, the negatively charged ________________(12) occupy most of the volume of the atom. The number of ________________(13) in the nucleus of an atom is the atomic ________________(14) of that element. Because atoms are electrically neutral, the number of protons and ________________(15) in a ...
Chapter 2. Atoms, Molecules, and Ions
... before reaction is equal to the total mass after reaction. • Conservation means something can neither be created nor destroyed. Here, it applies to matter (mass). Later we will apply it to energy (Chapter 5). Law of multiple proportions: If two elements A and B combine to form more than one compound ...
... before reaction is equal to the total mass after reaction. • Conservation means something can neither be created nor destroyed. Here, it applies to matter (mass). Later we will apply it to energy (Chapter 5). Law of multiple proportions: If two elements A and B combine to form more than one compound ...
Atoms - Dr. Vickie M. Williamson
... not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained. ! This piece would be _________________. ! He named the smallest piece of matter “atomos,” meaning “not to be cut.” ...
... not be divided into smaller and smaller pieces forever, eventually the smallest possible piece would be obtained. ! This piece would be _________________. ! He named the smallest piece of matter “atomos,” meaning “not to be cut.” ...
Atomic Model Power Point
... •Although Democritus’s ideas agreed with later scientific theory, they did not explain chemical behavior. •They also lacked experimental support. ...
... •Although Democritus’s ideas agreed with later scientific theory, they did not explain chemical behavior. •They also lacked experimental support. ...
The Building Blocks of Matter
... properties of that element.” The Structure of the Atom • We now know that atoms can be divided into many different subatomic particles. For example: – Nucleus- the center of the atom – Protons- positively (+) charged subatomic particle. – Neutrons- neutral (not charged) subatomic particle. – Electro ...
... properties of that element.” The Structure of the Atom • We now know that atoms can be divided into many different subatomic particles. For example: – Nucleus- the center of the atom – Protons- positively (+) charged subatomic particle. – Neutrons- neutral (not charged) subatomic particle. – Electro ...
Atomic Number
... In the case of atoms, scientists use large models to explain something that is very small Models of the atom were used to explain data or facts that were gathered experimentally. So, these models are also theories ...
... In the case of atoms, scientists use large models to explain something that is very small Models of the atom were used to explain data or facts that were gathered experimentally. So, these models are also theories ...
Development of Atomic Theory Paragraph
... states that the masses of one element that combine with a fixed mass of another ...
... states that the masses of one element that combine with a fixed mass of another ...
PPT Slides
... Atoms do not have a shell or anything else separating them from the rest of the world. The negatively charged electrons are attracted to the positively charged protons. ...
... Atoms do not have a shell or anything else separating them from the rest of the world. The negatively charged electrons are attracted to the positively charged protons. ...
ch19 - Otterville R-VI School District
... Democritus (400 B.C.) • Proposed that matter was composed of tiny indivisible particles ...
... Democritus (400 B.C.) • Proposed that matter was composed of tiny indivisible particles ...
Atoms and the Periodic Table
... The elements are arranged on the periodic table by the number of protons and then grouped by other properties, such as: ...
... The elements are arranged on the periodic table by the number of protons and then grouped by other properties, such as: ...
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.