Molecular cloud - Study guides, Class notes & Summaries

Which reaction requires the most energy? A. N(g) → N+(g) + e - B. N+(g) → N2+(g) + e - C. F(g) → F+(g) + e - D. F+(g) → F2+(g) + e - - D. F+(g) → F2+(g) + e - Fluorine has a higher effective nuclear charge than Nitrogen - so it is harder to remove an electron (takes more energy because the electron is more strongly attracted by the nucleus). Effective nuclear charge is the same for F and F+ because the number of protons and core electrons are not changed. However, when the numb...

Intermolecular forces - ANSWER- non bonding forces - found BETWEEN molecules - influence the energy physical properties of the substances Physical properties examples - ANSWERboiling point, melting point, solubility, color, odor, etc. T/F: stronger intermolecular forces correlate to a higher boiling point - ANSWERTrue Kinetic energy - ANSWER- provides the energy needed to overcome intermolecular forces What is kinetic energy associated with? - ANSWERThe random motion of particles...

T/F: Covalent bonds are present only when atomic orbitals interact constructively. Ans: True. Binding in Diamond Ans: Each carbon forms 4 bonds to 4 identical carbons; tetrahedral; sp3 Valence Bond Theory Ans: The idea that covalent bonds are formed when orbitals of different atoms overlap. T/F: Electrons are localized in molecular orbital. Ans: False T/F: Electrons are localized in Valence Bond. Ans: True T/F: When the hybrid orbitals combine, there is a large gap between the bondin...

AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry questions and answers verified What is the equation linking mass moles and MR? Mass=moles * MR What is the definition of Ar (relative atomic mass)? The average mass of an atom of an element compared to the mass of one twelfth of carbon 12. What does Mr stand for? Relative molecular mass Define relative isotopic mass. The mass of an isotope of an element compared to the mass of one twelfth of the mass of carbon 12 ...

TX PACT 4-8 CORE (790) QUESTIONS AND ANSWERS ALREADY PASSED How many SFs in 0.? - Answer ️️ -8 SFs: Addition and Subtraction Rules - Answer ️️ -answer has the same # decimal places as numeral w/the smallest # of decimal places. EX: 1063.02 + 12.5 = 1075.5 SFs: Multiplication/Division Rules - Answer ️️ -answer has the same # of SFs as numeral with smallest # of SFs. EX: 1063.02 x 12.5 = 13287.75 => 1.33 x 10^4 Define: Hypothesis, Theory, and Scientific Law - Answer ️️ ...

EAPS exam 1, Questions and answers, rated A+ How much of the solar system's mass resides in the Sun? 99.86% The five stages of the Solar Nebula Hypothesis in the correct order 1. Mass Loss 2. Diffuse Cloud 3. Dense Cloud 4. Accretion Disk 5. Stellar System Where did the first helium atom originate? the Big Bang created all hydrogen, the hydrogen atoms then fused into the helium atoms hydrogen ion (H+) Has no electron Very hot Emit light Molecular Hydrogen (H2) two hydrogen ato...

AQA 2023 AS CHEMISTRY 7404/2 Paper 2 Organic and Physical Chemistry questions and answers verified What is the equation linking mass moles and MR? Mass=moles * MR What is the definition of Ar (relative atomic mass)? The average mass of an atom of an element compared to the mass of one twelfth of carbon 12. What does Mr stand for? Relative molecular mass Define relative isotopic mass. The mass of an isotope of an element compared to the mass of one twelfth of the mass of carbon 12 ...

Define Geography - Study of Earth's physical features, inhabitants, and their spatial relationships/interactions Subfields of geographic study - Physical(landforms, water, soil, and animals) and Human(culture, economic and political) The Primary Steps of the Scientific Method - Observation, Hypothesis, Experimentation, Peer view, and Conclusion 4 primary environmental spheres - Atmosphere(air), Lithosphere(stone), Hydrosphere(water), and Biosphere(life) Latitude (parallels) - Lines go e...

Praxis 5005 Science Practice Test Questions and Answers Rated A+ Which of the following characteristics is (are) unique to mammals? milk producing glands Which of the following organ systems is responsible for the transport of blood and nutrients? circulatory system an example of a device that converts electrical energy directly into mechanical energy A motor represents the amount of space an object takes up? Volume Which of the following is a major advantage of sexual reproduction over asex...

TX PACT 4-8 CORE (790)How many SFs in 0.? - correct answer 8 SFs: Addition and Subtraction Rules - correct answer answer has the same # decimal places as numeral w/the smallest # of decimal places. EX: 1063.02 + 12.5 = 1075.5 SFs: Multiplication/Division Rules - correct answer answer has the same # of SFs as numeral with smallest # of SFs. EX: 1063.02 x 12.5 = 13287.75 => 1.33 x 10^4 Define: Hypothesis, Theory, and Scientific Law - correct answer Hypothesis: testable prediction ba...