File - Rogers` Rocket Science
... different from those of any other element. 3) Atoms of different elements __________in simple ________-number ratios to form _____________ compounds. 4) In chemical reactions, atoms are_________________, ________________, or ____________– but never changed into atoms of another element. Sizing up th ...
... different from those of any other element. 3) Atoms of different elements __________in simple ________-number ratios to form _____________ compounds. 4) In chemical reactions, atoms are_________________, ________________, or ____________– but never changed into atoms of another element. Sizing up th ...
Review Key
... Niels Bohr said that electrons reside in energy levels, aka energy shells. The energy of the level increases as the distance from the nucleus increases, and electrons fill the energy levels from the inside out, or from low to high energy. Atoms can be found in the ground state or the excited state. ...
... Niels Bohr said that electrons reside in energy levels, aka energy shells. The energy of the level increases as the distance from the nucleus increases, and electrons fill the energy levels from the inside out, or from low to high energy. Atoms can be found in the ground state or the excited state. ...
chapter 1 - Revsworld
... (18) A certain element has two naturally occurring isotopes. These isotopes have mass numbers of 63 and 65, and their fractional abundances are, respectively, 0.692 (69.2%) and 0.308 (30.8%). What is the atomic weight (or atomic mass) of this element? a) b) c.) d) e) ...
... (18) A certain element has two naturally occurring isotopes. These isotopes have mass numbers of 63 and 65, and their fractional abundances are, respectively, 0.692 (69.2%) and 0.308 (30.8%). What is the atomic weight (or atomic mass) of this element? a) b) c.) d) e) ...
8.P.1.1Homework for Website
... B. It cannot combine with other substances, liquid at room temperature, and cannot be changed into simpler substances. C. It is solid at room temperature, can be broken down from compounds by chemical changes, and composed of one kind of atom. 7. Which is a homogeneous mixture? A. woven fabric B. co ...
... B. It cannot combine with other substances, liquid at room temperature, and cannot be changed into simpler substances. C. It is solid at room temperature, can be broken down from compounds by chemical changes, and composed of one kind of atom. 7. Which is a homogeneous mixture? A. woven fabric B. co ...
Chapter 1
... B. Now for Some Neutrons C. Building Bigger Atoms D. Protons and Atomic Number *Notes-The number of protons in the nucleus of an atom give the element its _______atomic number______________. (also the number of electrons) ...
... B. Now for Some Neutrons C. Building Bigger Atoms D. Protons and Atomic Number *Notes-The number of protons in the nucleus of an atom give the element its _______atomic number______________. (also the number of electrons) ...
First Semester Honors Chemistry Exam Review (2011
... 48. What is the horizontal row of blocks in the periodic table called? 49. What is the energy required to remove an electron from an atom called? 50. What is the trend of electronegativity on the periodic table? 51. What is a positive ion? A negative ion? 52. What are Valence electrons? 53. How many ...
... 48. What is the horizontal row of blocks in the periodic table called? 49. What is the energy required to remove an electron from an atom called? 50. What is the trend of electronegativity on the periodic table? 51. What is a positive ion? A negative ion? 52. What are Valence electrons? 53. How many ...
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ChemChapter_3[1]
... the same conditions of temperature and pressure, have the same number of molecules. Amedeo Avogadro. ...
... the same conditions of temperature and pressure, have the same number of molecules. Amedeo Avogadro. ...
Chapter Test on 4, 5 2016-2017 _____1. You ar
... 36. Two atoms must be the same element if they have the same number of ___________________. 37. What element has an atomic number of 13? ______________ 38. How many protons are there in an atom of Radon? __________ 39. When writing down the combinations of the elements that form a compound, such as ...
... 36. Two atoms must be the same element if they have the same number of ___________________. 37. What element has an atomic number of 13? ______________ 38. How many protons are there in an atom of Radon? __________ 39. When writing down the combinations of the elements that form a compound, such as ...
Chemical Equations and Tests for anions
... found that the total mass of products is always equal to the total mass of reactants ...
... found that the total mass of products is always equal to the total mass of reactants ...
Sample Exam 1 Key
... 4. A Lewis dot structure for this atom has five electrons around the symbol. Which of the following could be the atom? a) phosphorus b) xenon c) aluminum d) boron 5. These two elements follow a “duet” rather than an octet rule. What are they? a) helium and neon b) hydrogen and helium c) sodium and c ...
... 4. A Lewis dot structure for this atom has five electrons around the symbol. Which of the following could be the atom? a) phosphorus b) xenon c) aluminum d) boron 5. These two elements follow a “duet” rather than an octet rule. What are they? a) helium and neon b) hydrogen and helium c) sodium and c ...
Chapter 2 - Speedway High School
... • Trace elements are those required by an organism in minute quantities ...
... • Trace elements are those required by an organism in minute quantities ...
Final review free response ch 1-4
... d. ___K + ___Br2 KBr e. ___P4 + ___O2 P2O5 f. ___C7H16 + ___O2 ___CO2 + ___H2O g. ___C3H5OH + ___O2 ___CO2 + ___H2O 4. Write and balance the following reactions: a. Zinc Carbonate can be heated to form Zinc Oxide and Carbon Dioxide ...
... d. ___K + ___Br2 KBr e. ___P4 + ___O2 P2O5 f. ___C7H16 + ___O2 ___CO2 + ___H2O g. ___C3H5OH + ___O2 ___CO2 + ___H2O 4. Write and balance the following reactions: a. Zinc Carbonate can be heated to form Zinc Oxide and Carbon Dioxide ...
Answer Key to Chem Semester 1 Exam Review
... Answer Key to Chem Semester 1 Exam Review Questions (Parts 3 & 4) Pgs. 89-90 1. A. Because all chemical reactions are only the rearrangements of atoms, mass is neither created nor destroyed in such changes. B. Atoms of each element have their own characteristic mass, so compounds consisting of these ...
... Answer Key to Chem Semester 1 Exam Review Questions (Parts 3 & 4) Pgs. 89-90 1. A. Because all chemical reactions are only the rearrangements of atoms, mass is neither created nor destroyed in such changes. B. Atoms of each element have their own characteristic mass, so compounds consisting of these ...
Chemical Reactions
... • The only place you can change any number is the coefficient. • A coefficient is a number written in front of a chemical formula. • Don’t forget diatomic molecules. • Use the smallest ratio of coefficients possible. ...
... • The only place you can change any number is the coefficient. • A coefficient is a number written in front of a chemical formula. • Don’t forget diatomic molecules. • Use the smallest ratio of coefficients possible. ...
The Structure of the Atom Chapter 4
... • Since matter is neutral, and the mass of an electron was so small compared to the overall mass of the atom, Thompson proposed a model of the atom that became known as the ...
... • Since matter is neutral, and the mass of an electron was so small compared to the overall mass of the atom, Thompson proposed a model of the atom that became known as the ...
Chapter 5 The Structure of the Atom
... 3. Elements (atoms) can change into atoms of another element Radioactive elements 1. Nuclei are unstable 2. Gain stability by losing electrons ...
... 3. Elements (atoms) can change into atoms of another element Radioactive elements 1. Nuclei are unstable 2. Gain stability by losing electrons ...
Atomic Review
... 3. Use the following information to determine the atomic mass of chlorine. Two isotopes are known: chlorine-35 (mass = 34.97 amu) and chlorine-37 (mass = 36.97 amu). The relative abundance’s are 75.4% and 24. 6%, respectively. ...
... 3. Use the following information to determine the atomic mass of chlorine. Two isotopes are known: chlorine-35 (mass = 34.97 amu) and chlorine-37 (mass = 36.97 amu). The relative abundance’s are 75.4% and 24. 6%, respectively. ...
Facts about Carbon Compounds (Pages 44-48)
... Saturated fats are formed when each carbon in the lipid’s fatty acid chain are joined by a single bond. If there is at least one double carbon-to-carbon bond, it is referred to as unsaturated. Lipids whose fatty acids contain more than one double bond are called polyunsaturated. ...
... Saturated fats are formed when each carbon in the lipid’s fatty acid chain are joined by a single bond. If there is at least one double carbon-to-carbon bond, it is referred to as unsaturated. Lipids whose fatty acids contain more than one double bond are called polyunsaturated. ...
Review Notes - Biochemistry
... The goal of all atoms is to have a _STABLE_ outer energy level. The goal leads to bonding of atoms. 2 types of bonding: 1. Ionic Bonding: When _1_ or more electrons are _TRANSFERRED_ from one atom to another. Ion: an atom with a_CHARGE_. When an electron is gained it will be _NEGATIVE_charged ...
... The goal of all atoms is to have a _STABLE_ outer energy level. The goal leads to bonding of atoms. 2 types of bonding: 1. Ionic Bonding: When _1_ or more electrons are _TRANSFERRED_ from one atom to another. Ion: an atom with a_CHARGE_. When an electron is gained it will be _NEGATIVE_charged ...
Element Symbol Number of Protons Number of electrons Number of
... 3. Use the following information to determine the atomic mass of chlorine. Two isotopes are known: chlorine-35 (mass = 34.97 amu) and chlorine-37 (mass = 36.97 amu). The relative abundance’s are 75.4% and 24. 6%, respectively. ...
... 3. Use the following information to determine the atomic mass of chlorine. Two isotopes are known: chlorine-35 (mass = 34.97 amu) and chlorine-37 (mass = 36.97 amu). The relative abundance’s are 75.4% and 24. 6%, respectively. ...
Atoms and Nuclei
... represent the three isotopes of hydrogen. All contain one proton (Z = 1 or it wouldn’t be hydrogen!) but these three isotopes contain zero, one, and two neutrons, respectively. The atomic number Z is sometimes included as a subscript but usually not since the chemical symbol implies the Z-value. The ...
... represent the three isotopes of hydrogen. All contain one proton (Z = 1 or it wouldn’t be hydrogen!) but these three isotopes contain zero, one, and two neutrons, respectively. The atomic number Z is sometimes included as a subscript but usually not since the chemical symbol implies the Z-value. The ...
UNIT 3 VOCABULARY MATCHING and mole problems
... ____ 8.) discovered the nucleus with the gold foil experiment ____ 9.) positively-charged subatomic particle ____ 10.) established that atoms of one element are not changed into atoms of another element in a chemical reaction ____ 11.) hypothesized that electrons travel around the center of the atom ...
... ____ 8.) discovered the nucleus with the gold foil experiment ____ 9.) positively-charged subatomic particle ____ 10.) established that atoms of one element are not changed into atoms of another element in a chemical reaction ____ 11.) hypothesized that electrons travel around the center of the atom ...
Atomic Structure and Types of Atoms
... An isotope is identified by its mass number, which is the sum of the protons and neutrons in the nucleus of an atom. The most common isotope of carbon has a mass number of 12 (6 protons + 6 neutrons) and may be written as “carbon-12.” Two other isotopes are carbon-13 and carbon-14. As shown in Figur ...
... An isotope is identified by its mass number, which is the sum of the protons and neutrons in the nucleus of an atom. The most common isotope of carbon has a mass number of 12 (6 protons + 6 neutrons) and may be written as “carbon-12.” Two other isotopes are carbon-13 and carbon-14. As shown in Figur ...
Isotopic labeling
Isotopic labeling (or isotopic labelling) is a technique used to track the passage of an isotope, or an atom with a variation, through a reaction, metabolic pathway, or cell. The reactant is 'labeled' by replacing specific atoms by their isotope. The reactant is then allowed to undergo the reaction. The position of the isotopes in the products is measured to determine the sequence the isotopic atom followed in the reaction or the cell's metabolic pathway. The nuclides used in isotopic labeling may be stable nuclides or radionuclides. In the latter case, the labeling is called radiolabeling.In isotopic labeling, there are multiple ways to detect the presence of labeling isotopes; through their mass, vibrational mode, or radioactive decay. Mass spectrometry detects the difference in an isotope's mass, while infrared spectroscopy detects the difference in the isotope's vibrational modes. Nuclear magnetic resonance detects atoms with different gyromagnetic ratios. The radioactive decay can be detected through an ionization chamber or autoradiographs of gels.An example of the use of isotopic labeling is the study of phenol (C6H5OH) in water by replacing common hydrogen (protium) with deuterium (deuterium labeling). Upon adding phenol to deuterated water (water containing D2O in addition to the usual H2O), the substitution of deuterium for the hydrogen is observed in phenol's hydroxyl group (resulting in C6H5OD), indicating that phenol readily undergoes hydrogen-exchange reactions with water. Only the hydroxyl group was affected, indicating that the other 5 hydrogen atoms did not participate in these exchange reactions.