Bohr theory - Study guides, Class notes & Summaries

Chem 219: Exam 2 Questions With 100% Correct Answers The atomic radii of zirconium (Zr) and hafnium (Hf) are nearly the same despite the fact that hafnium has 32 more protons and electrons. Which of the following bests explains this phenomenon? - answerHafnium contains electrons in the 4f orbitals. These 4f electrons do not effectively shield the higher nuclear charge and thus Zeff is higher than might be otherwise expected. Which of the following is true concerning successive ionizations...

ACS GEN CHEM 1 FINAL Exam 166 Questions with Verified Answers The physical material of the universe. It is anything that has mass and occupies space. - CORRECT ANSWER Matter is made up of relatively few elements. - CORRECT ANSWER Matter The smallest building block of matter. Smallest particle that retains the chemical property of the element (O, He, S). - CORRECT ANSWER Atom Each _______ is made of the same kind of atom - CORRECT ANSWER Element Combination of atoms held together i...

ACS Gen Chem 1 Exam 89 Questions with Verified Answers Extensive Property - CORRECT ANSWER Values that depend on how much you have Intensive property - CORRECT ANSWER Independent of size sample Density - CORRECT ANSWER Mass/volume Homogeneous mixture - CORRECT ANSWER Same throughout, indistinguishable parts Heterogeneous - CORRECT ANSWER Different parts, distinguishable parts Diatomic elements - CORRECT ANSWER N2, O2, H2, Cl2, Br2, I2 John dalton - CORRECT ANSWER Founded the...

What are the properties of group 1 metals? - Ans .Can be cut with a knife Shiny, but tarnish quickly with air, because a layer of oxide is formed Good conductors of electricity (Like all metals) Low density Low melting point What are the properties of group 7? - Ans .• All gain an electron during their reactions • They are poisonous • 7 electrons in their outer shells • when they gain an electron they form hallide ions What is the trend in reactivity of group 1? - Ans .The react...

Chapter 1—Molecular Reasons MULTIPLE CHOICE 1. Which of these is the best definition of matter? a. The pull of gravity on an object. b. Anything that has weight and volume. c. Anything that has mass and occupies space. d. Anything that is directly proportional to weight. e. The measure of the amount of space an object occupies. ANS: C PTS: 1 2. Which of these statements is correct? a. The amount of carbon on earth is essentially constant. b. The amount of carbon on earth fluctuates...

Test Bank for The Sciences: An Integrated Approach,8e, 8th Edition by James Trefil, Robert M. Hazen. ISBN-13: 9685 Full Chapters test bank included 1 Science: A Way of Knowing 1 How do you know what you know? The Role of Science 2 The Scientific Method 4 Other Ways of Knowing 12 The Organization of Science 14 2 The Ordered Universe 25 Why do planets appear to wander slowly across the sky? The Night Sky 26 The Birth of Mechanics 32 Isaac Newton and the Universal ...

FTCE Middle Grades Science 5-9 Exam 406 Questions with Verified Answers Which of the properties listed below is a characteristic of a liquid but not of a gas? A. It has the ability to flow. B. It maintains its volume in an open container. C. Its molecules are constantly in motion. D. Its volume varies depending on temperature. - CORRECT ANSWER B A 0.100 m3 chamber is filled with oxygen gas at standard conditions (101 kPa at 273 k). Assuming ideal conditions and behavior, what will be t...

ion - correct answer a molecule with a charge cation - correct answer a molecule with a positive charge anion - correct answer a molecule with a negative charge solid - correct answer definite shape and volume liquid - correct answer definite volume, takes the shape of its container gas - correct answer indefinite shape and volume plasma - correct answer matter stripped of its electrons that gives of light solution - correct answer made of a solute and solvent heterogeneo...

Chemistry final review questions and answers well illustrated. intensive properties - correct ds on what type of matter (ex: denisty, composition, atomic structure) extensive properties - correct ds on how much matter you have (amount of matter), ex: mass, volume, shape homogenous mixtures - correct phase (part that you can see), individual parts not visible (ex: solutions) heterogenous mixture - correct re does not appear the same throughout (ex: colloids, suspeniso...

Chapter 1 - Chemical Foundations 1. Consider the element indium, atomic number 49, atomic mass 114.8 g. The nucleus of an atom of indium-112 contains: a. 49 protons, 63 neutrons, 49 electrons. b. 49 protons, 49 neutrons. c. 49 protons, 49 alpha particles. d. 49 protons, 63 neutrons. e. 49 protons, 112 neutrons. ANSWER: d POINTS: 1 2. A hypothetical element consists of two isotopes of masses 78.95 amu and 80.95 amu with abundances of 32.9% and 67.1%, respectively. What is the average a...