OXIDATION NUMBERS
... 1 Work out the formula of the species before and after the change; 2 If different numbers of the relevant species are on both sides, balance them 3 Work out the oxidation number of the element before and after the change 4 Add electrons to one side of the equation so the oxidation numbers balance 5 ...
... 1 Work out the formula of the species before and after the change; 2 If different numbers of the relevant species are on both sides, balance them 3 Work out the oxidation number of the element before and after the change 4 Add electrons to one side of the equation so the oxidation numbers balance 5 ...
The Structure of the Atom - Warren County Public Schools
... •The laser beam consisted of positively charged alpha particles. •Hypothesized that if the Plum Pudding model of the atom was correct then the + charged alpha particles should deflect or bend slightly when in contact with the gold foil atoms. •His experimental results revealed something different. M ...
... •The laser beam consisted of positively charged alpha particles. •Hypothesized that if the Plum Pudding model of the atom was correct then the + charged alpha particles should deflect or bend slightly when in contact with the gold foil atoms. •His experimental results revealed something different. M ...
Chem 1 Worksheets WSHEET 1: Working with Numbers Practice
... athletic trainers when transporting ice is not possible. Which of the following is true of this reaction? A. H < 0, process is exothermic B. H > 0, process is exothermic C. H < 0, process is endothermic D. H > 0, process is endothermic E. H = 0, since cold packs are sealed 6. A Snickers® candy ...
... athletic trainers when transporting ice is not possible. Which of the following is true of this reaction? A. H < 0, process is exothermic B. H > 0, process is exothermic C. H < 0, process is endothermic D. H > 0, process is endothermic E. H = 0, since cold packs are sealed 6. A Snickers® candy ...
REVIEW GAME
... Atoms of the same element are identical Atoms of different elements can physically mix together of can chemically combine with one another in simple whole-number ratios Chemical reactions occur when atoms are separated, joined, or rearranged. ...
... Atoms of the same element are identical Atoms of different elements can physically mix together of can chemically combine with one another in simple whole-number ratios Chemical reactions occur when atoms are separated, joined, or rearranged. ...
Name: 1) The modern model of the atom is based on the work of A
... B) An atom has hardly any empty space, and the nucleus has a positive charge. C) An atom is mainly empty space, and the nucleus has a negative charge. D) An atom has hardly any empty space, and the nucleus has a negative charge. ...
... B) An atom has hardly any empty space, and the nucleus has a positive charge. C) An atom is mainly empty space, and the nucleus has a negative charge. D) An atom has hardly any empty space, and the nucleus has a negative charge. ...
Term 1 and 2 Powerpoints
... thought of where all the statistics we hear about come from, and how the claims are substantiated. How do scientists know exactly what percent our ozone layer has deteriorated, and what percent of our atmosphere is made up harmful pollutants? Well when fossil fuels are burned, or maybe even things l ...
... thought of where all the statistics we hear about come from, and how the claims are substantiated. How do scientists know exactly what percent our ozone layer has deteriorated, and what percent of our atmosphere is made up harmful pollutants? Well when fossil fuels are burned, or maybe even things l ...
Electronic Structure of Atoms
... • As the number of electrons increases, so does the repulsion between them. • Therefore, in atoms with more than one electron, not all orbitals on the same energy level are degenerate. • Orbital sets in the same sublevel are still degenerate. • Energy levels start to overlap in energy (e.g., 4s is l ...
... • As the number of electrons increases, so does the repulsion between them. • Therefore, in atoms with more than one electron, not all orbitals on the same energy level are degenerate. • Orbital sets in the same sublevel are still degenerate. • Energy levels start to overlap in energy (e.g., 4s is l ...
CHAPTER 1: The Birth of Modern Physics
... neutrons and the protons together in the nucleus Strongest of all the fundamental forces ...
... neutrons and the protons together in the nucleus Strongest of all the fundamental forces ...
atomic regents review
... The number of protons equals the number of electrons in an atom. (3.1e) # of protons = # of electrons Therefore, atoms are electrically neutral. J Deutsch 2003 ...
... The number of protons equals the number of electrons in an atom. (3.1e) # of protons = # of electrons Therefore, atoms are electrically neutral. J Deutsch 2003 ...
Science Focus 9 Matter and Chemical Change Class Notes Topic 1
... very reactive and need special storage. They easily give off an unpaired electron by forming a compound. ...
... very reactive and need special storage. They easily give off an unpaired electron by forming a compound. ...
Atomic Structure
... A thermometer is in a beaker of water. Which statement best explains why the thermometer reading initially increases when LiBr (s) is dissolved in the water? (1) The entropy of the LiBr (aq) is greater than the entropy of the water. (2) The entropy of the LiBr (aq) is less than the entropy of the wa ...
... A thermometer is in a beaker of water. Which statement best explains why the thermometer reading initially increases when LiBr (s) is dissolved in the water? (1) The entropy of the LiBr (aq) is greater than the entropy of the water. (2) The entropy of the LiBr (aq) is less than the entropy of the wa ...
Catalyst – September, 7(1+1) 2009 - stroh
... substance that cannot be broken down into simpler substances by physical or chemical means NOT THIS KIND OF ELEMENT ...
... substance that cannot be broken down into simpler substances by physical or chemical means NOT THIS KIND OF ELEMENT ...
Review for Unit 2A Test
... In approximately 400 BC _Democritus___ stated the first atomic theory. For almost 2200 years there was not an atomic theory because _Aristotle__ had disagreed with the idea of atoms. Finally, around the year 1800, __Dalton__ brought back the atomic theory. This time, the theory was based on experime ...
... In approximately 400 BC _Democritus___ stated the first atomic theory. For almost 2200 years there was not an atomic theory because _Aristotle__ had disagreed with the idea of atoms. Finally, around the year 1800, __Dalton__ brought back the atomic theory. This time, the theory was based on experime ...
PPT format - Columbia University
... proving that the products weighed more than the original. The weight gained was lost from the air. Repeating the experiments of Priestley, he demonstrated that air is composed of two parts, one of which combines with metals to form calxes. He named this portion oxygen (Greek for acid-former), and th ...
... proving that the products weighed more than the original. The weight gained was lost from the air. Repeating the experiments of Priestley, he demonstrated that air is composed of two parts, one of which combines with metals to form calxes. He named this portion oxygen (Greek for acid-former), and th ...
Electrons - sotochem
... Aufbau Principle: Electrons fill subshells (and orbitals) so that the total energy of atom is the minimum ...
... Aufbau Principle: Electrons fill subshells (and orbitals) so that the total energy of atom is the minimum ...
File
... lanthanides (elements 58 - 71) and actinides (elements 90 - 103). The naturally occurring rare earths are found on earth in only very small amounts. The actinides include most of the well-known elements that take part in or are produced by nuclear reactions. No element with atomic number higher than ...
... lanthanides (elements 58 - 71) and actinides (elements 90 - 103). The naturally occurring rare earths are found on earth in only very small amounts. The actinides include most of the well-known elements that take part in or are produced by nuclear reactions. No element with atomic number higher than ...
Ch. 4 Statement of Evidence Atoms + Notes Outline
... 3. How did Thomson discover electrons? How did he prove that they exist? (pg. 84) Thomson discovered electrons by using a cathode-ray tube with a positive charged plate at the end that attracted the beam. Since opposite charges attract, he concluded the beam must be negative charged particles in ato ...
... 3. How did Thomson discover electrons? How did he prove that they exist? (pg. 84) Thomson discovered electrons by using a cathode-ray tube with a positive charged plate at the end that attracted the beam. Since opposite charges attract, he concluded the beam must be negative charged particles in ato ...
isotopes
... one more proton than electron. One more proton means one more positive charge. This makes the total charge of the atom POSITIVE. This atom has gained an electron. Now it has one less proton than electron. One less proton means one less positive charge. This makes the total charge of the atom NEGATIV ...
... one more proton than electron. One more proton means one more positive charge. This makes the total charge of the atom POSITIVE. This atom has gained an electron. Now it has one less proton than electron. One less proton means one less positive charge. This makes the total charge of the atom NEGATIV ...
Chapter 7_honors
... Assigning Oxidation Numbers (con’t) 5. Hydrogen has an ox# = +1 in all compounds containing elements that are more electronegative than it. However it has an ox# = -1 in compounds with metals. 6. The algebraic sum of the oxidation numbers of all atoms in a neutral compound is equal to zero. ...
... Assigning Oxidation Numbers (con’t) 5. Hydrogen has an ox# = +1 in all compounds containing elements that are more electronegative than it. However it has an ox# = -1 in compounds with metals. 6. The algebraic sum of the oxidation numbers of all atoms in a neutral compound is equal to zero. ...
Topic 1 Review - Capital High School
... 26. There are __________ orbitals in the second level. 27. The second level in the ground state of atomic argon contains __________ electrons. 28. In a ground-state manganese atom, the __________ sublevel is half filled. 29. What is the correct ground-state electron configuration for copper? 30. All ...
... 26. There are __________ orbitals in the second level. 27. The second level in the ground state of atomic argon contains __________ electrons. 28. In a ground-state manganese atom, the __________ sublevel is half filled. 29. What is the correct ground-state electron configuration for copper? 30. All ...
IB Chemistry Review. Unit I. Topics 2
... 26. There are __________ orbitals in the second level. 27. The second level in the ground state of atomic argon contains __________ electrons. 28. In a ground-state manganese atom, the __________ sublevel is half filled. 29. What is the correct ground-state electron configuration for copper? 30. All ...
... 26. There are __________ orbitals in the second level. 27. The second level in the ground state of atomic argon contains __________ electrons. 28. In a ground-state manganese atom, the __________ sublevel is half filled. 29. What is the correct ground-state electron configuration for copper? 30. All ...
