The bohr atom - Study guides, Class notes & Summaries

RADT 1065 Chapter 2 Test Questions and Answers All Correct How many atoms are there in one molecule of sodium bicarbonate (NaHCO3)? - Answer 6 Which of the following physicists had a major part in describing the atom as we know it today? - Answer Bohr The periodic chart of elements is attributed to: - Answer Dimitri Mendeleev Rutherford made what significant contribution to science? - Answer description of the nuclear atom The difference between x-rays and gamma rays is: - An...

GCSE EDEXCEL TRIPLE SCIENCE CHEMISTRY PAPER 2 2024/2025 QUESTION PAPER ALREADY PASSED What does 'aq' mean? - answer Aqueous - it is dissolved in water Water - formula - answer H20 Ammonia - formula - answer NH3 Carbon Dioxide - formula - answer CO2 Hydrogen - formula - answer H2 Chlorine - formula - answer Cl2 Oxygen - formula - answer O2 Ammonium (ion) - formula - answer NH4 (+) Hydroxide (ion) - formula - answer OH (-) Nitrate (ion) - formula - answer NO3 (-) Carbonate (ion) -...

Atom definition The smallest component of an element Compound Two or more elements, chemically joined in fixed proportions. They can only be separated by chemical means. Mixture Two or more elements/compounds which are not chemically combined. Ways to separate mixtures - Filtration - Evaporation - Crystallisation - Simple distillation - Fractional distillation - Paper chromatography The plum and pudding model Before electrons were discovered, people thought that atoms were indivi...

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...

AQA AS Physical Chemistry 2024 exam questions with 100% correct answers Who described atoms as solid spheres that make up different elements and when? - ANSWERS John Dalton in the 19th century Who suggested that atoms of a particular element had the same mass and atoms of different elements had different masses and when? - ANSWERS John Dalton in 1803 Who discovered the electron and when? - ANSWERS JJ Thomson, 1897 discovered electrons proving atoms weren't indivisible or solid. New m...

Bohr-Rutherford Model of the Atom

What does it mean if said that energy is quantized? and what confirms this? - correct answer only certain energy states are allowed in an atom, Line spectra of elements Describe the Bohr model of atom theory - correct answer 1. e-'s are limited to certain energy states 2. Energy levels:

wave - oscillation or periodic movement that can transport energy from one point in space to another - can travel through a vacuum at a constant speed of 2.998 x 10^8 m/s, speed of light denoted by c wavelength - distance between 2 consecutive peaks or troughs in a wave - denoted by lambda amplitude - extent of the displacement and caused by a wave - magnitude - denoted by A frequency - the number of wave cycles that pass a specified point in space in a specified amo...

2 © OCR 2023 Section A You should spend a maximum of 20 minutes on this section. Write your answer to each question in the box provided. 1 Which new feature of the atomic model did Niels Bohr suggest? A Electrons are in stable shells. B Electrons orbit a nucleus. C The atom has a nucleus. D The nucleus is positive. Your answer [1] 2 Two rooms have the same fixed volume. They contain identical gases at the same pressure. Room H is at a higher temperature than room L. Which statement...

Activation energy - Energy needed to get a reaction started Active transport - The movement of materials through a cell membrane using energy; from a low concentration to a high concentration until it reaches disequilibrium. Adenine - The base that pairs with Thymine in DNA, and Uracil in RNA Aerobic cycle - Glycolysis -> Kreb's cycle -> ETC Aerobic respiration - Cellular respiration that requires oxygen Allele - Different forms of a gene Anaphase - Phase of mitosis in which the ch...