a scientific method, which of the following is the correct order of steps? AJ Ob
ID: 192267 • Letter: A
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a scientific method, which of the following is the correct order of steps? AJ Observation Analysis-Hypothesis-Conclusion-communicate results-Expermet B) Observation+ Hypothesis+Experiment Co Analysis C) Experiment-Hypothesis- Observation Comm ncate 12. Which is a substance A) Matter that cannot be broken down to other substances by a chemical reaction? C) Inorganic D) Organic B) Electrons and protons D) Electrons, neutrons and valence shells 13, Which of the following tall components of an atom? A) Neutrons and protons C) Neutrons, protons and electrons 14. hemicaly inert atom with two electon shell. How many electors are in b valne·hen Neon is a 8) 4 c)6 15 Isotopes are atoms that differ in their number of D) Protons B) Electrons C) Valence shells A) Neutrons A) Hydrogen bond A) Covalent bond A) Grouping A) Specific heat 8. The type of bond that results when equal sharing of electrons occurs between atoms B) Polar covalent D) lonic bond D) lonic bond D) Expansion C) Nonpolar covalent 17. Which of the following is an example of a weak chemical bond? 18. The phenomenon by which hydrogen bonds hold water molecules together 19. The process by which a liquid evaporates and its remaining surface cools B) Hydrogen bond C) Polar covalent bond B) Adhesion C) Cohesion B) Evaporative cooling C) Evaporation D) Surface tension 20. A liquid that is a completely homogeneous mixture of substances A) Solute B) Solvent C) Solution D) Aqueous solution 21. Which of the following efflects can occur because of the high surface tension of water? A) Lakes cannot freeze solid in winter, despite low temperatures 8) A raft spider can walk across the surface of a small pond C) Sweat can evaporate from the skin, helping to keep people from overheating D) Organisms can resist 22- The coastal city of Portland, Oregon and the inland city of latitude, but Minneapolis has much hotter temperature changes, although they give off heat due to chemical reactions. Minneapolis, Minnesota, are at about the same summers and much colder winters than Portland. Why? A) The ocean near Portland moderates the temperature. B) Fresh water is more likely to freeze than salt water C) They are not at the same exact latitude D) Minneapolis is much windier, due to its location in the middle of North America. 23. In a water molecule. A) the oxygen atom is bound to two hydrogen atoms by a covalent bond 8) the oxygen atom has a slight negative charge and the hydrogen atoms have a slight positive charge. C) unequal sharing of electrons results in a polar molecule. D) All of the choices are correctExplanation / Answer
11. In a scientific method, Hypothesis are framed based on Observations. So you Observe and frame the Hypothesis. Then we test the Hypothesis using Experiments. The results of the Experiments are Analysed. Based on the Analysis results, Conclusions are derived about the hypothesis formulated. The entire scientific process in finally Communicated. Having the various steps of scientific method will thus be, Observation, Hypothesis, Experiment, Analysis, Conclusion and Communicate Results. Hence d is correct. In C the scientific method begins with an experiment which will have no focus of study. In B the scientific method results are expected to be communicated before analysis and deriving conclusion which has no means communicated information are abstract data. In A the scientific method analyses observations which is not abstract and will not yield evidences to the observed information.
12. There are 3 types of matter and using temperature matter can be changed to other physical states. Organic and inorganic substances react with themselves and each other to form simple compounds and they can be broken down to other substances. Elements are species of atoms having same number of protons. They cannot be broken down further to simpler substances. Hence elements is the correct answer.
13. An atom consists of neutrons, protons and electron. So c is correct. A do not mention electrons which makes the entire atom structure, b has no neutrons which forms the core of the atom and D) do not mention protons and discusses of valence shells which do not form the structure of an atom.
14. Neon is an inert atom as the entire number of atoms in the valence shell is completely filled. This makes Neon less reactive. The second shell in the structure of the atom can occupy 6 electrons and so the valence shell in Neon will contain c) 6 electrons. Others, a, b and d are wrong. A over represents the number of electrons that can occupy the second shell while c and d underpresents.
15. Isotopes are atoms that differ in the number of neutrons but have the same number of protons. The nucleus of the atoms is the focus of mass number that makes isotopes. Neutrons are stable and remain same as the protons but the variation causes isotopes to be formed that release energy. electrons and valence shells forms the outer surface of the atoms and are not involved in this energy. Hence a) neutrons is correct.
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