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UA BSC 108 EXAM 1 LATEST 2024-2025 COMPLETE 200
QUESTIONS AND DETAILED VERIFIED ANSWERS
BSC 108 EXAM 1
What are the 4 most important trace elements? (include symbol and %) - ANSWER-Oxygen O 65% Carbon C 18.5% Hydrogen H 9.5% Nitrogen N 3.3% What are 8 other important trace elements? (include symbol) - ANSWER-sodium Na potassium K iron Fe magnesium Mg calcium Ca chlorine Cl phosphorus P sulfur S What is a radioactive isotope? - ANSWER-The nucleus decays, giving off particles and energy How many electrons are found in the first energy shell? second? third? - ANSWER-up to 2 in 1st shell up to 8 in 2nd shell 1 / 4
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2 up to 18 in 3rd shell up to 32 in 4th shell What is the difference between atomic number and atomic mass? - ANSWER-Atomic number is equal to the number of protons
Atomic mass is equal to the number or protons plus the neutrons What are the 3 types of chemical bonds? - ANSWER-ionic, covalent, hydrogen How are ionic bonds form? - ANSWER-Attraction of positive and negative ions How are covalent bonds form? - ANSWER-Sharing electrons between atoms How are hydrogen bonds form? - ANSWER-Unequal sharing of electrons Which bond is the strongest,weakest? - ANSWER-Covalent bonds are the strongest
Hydrogen bonds are the weakest How does the hydrogen bond contribute to the properties of water? - ANSWER-High heat of vaporization and ice formation Why is the chemistry of life water chemistry? - ANSWER-Life only occurs where liquid water is present What is the difference between an ionic bond and a covalent bond? - ANSWER-Ionic bonds are between a metal and a nonmetal
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3 Covalent bonds are only between 2 nonmetals In a chemical reaction what is the beginning material known as? - ANSWER-Reactants In a chemical reaction what is the ending material referred to as? - ANSWER-Products Why can water absorb a lot of heat? - ANSWER-Water has high heat capacity Why does ice float? - ANSWER-Due to the formation of a crystalline structure Why is ice less dense? - ANSWER-It has fewer molecules What is the ecological importance of ice floating? - ANSWER-It is important to aquatic organisms What is biology? - ANSWER-The study of life What are the 3 domains? - ANSWER-Eukarya, Bacteria, Archae What are the 4 kingdoms in eukarya? - ANSWER-Kingdom Amimalia, Kingdom Plantae, Kingdom Fungi, Kingdom Protista What are the 7 properties of life? - ANSWER-they have order, they regulate themselves, they grow and develop, they use energy, they respond to the environment, they reproduce, population evolve What defines living? - ANSWER-It has cells What are the common themes of biology? - ANSWER-pervade all of biology, will make sense to you in the future What is the scientific method? - ANSWER-Make an observation, Ask a question, Make a hypothesis, Draw a conclusion, Conduct a experiment, Report results 3 / 4
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4 When did the scientific method started? - ANSWER-Started with the outbreak of cholera London 1854 What is a hypothesis? - ANSWER-A tentative explanation for an observation What are the components of a good hypothesis? - ANSWER-Repeated trials, good track of data What is the difference between a hypothesis and a prediction? - ANSWER-A prediction is a guess what might happen based on observation.
A hypothesis is a possible explanation for a observation or problem that can further be tested by experimentation. (more general) What is observation? - ANSWER-The recording of data What is control? - ANSWER-Constant and unchanging What is a theory? - ANSWER-A much broader in scope than a hypothesis, can be changed but unlikely What are the limits of science? - ANSWER-It is not the only way to understand nature and cannot address every question posed by man What is an atom? - ANSWER-It is the smallest unit of an element that has all its properties What is a proton, neutron, and electron? - ANSWER-A proton is a positive charged atom, a neutron is a no charged atom, and a electron is a negative charged atom What is an atom composed of? - ANSWER-protons, neutrons, and electrons What is 1 proton and neutron equal to? and electron? - ANSWER-1 proton and neutron can equal to 1 dalton. An electron is negligible
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