Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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how does matter change phases? matter changes from solid to liquid to g…
A. Matter changes from solid to liquid to gas with temperature increase and vice versa with temperature decrease.
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multiple choice (3 points each) identify the choice that best completes…
1. b. 5 2. b. Phosphorus 3. a. long wavelengths and low energy 4. c. 3 5. b. As frequency increases, wavelength decreases and vice versa 6. d. One electron in each orbital ↑ ↑ ↑ 7…
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7. isotopes of the same element differ in the number of: orbitals neutr…
B. Neutrons
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6. the modern atomic model describes the location of electrons as: insi…
In energy levels/orbitals around the nucleus
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q 5. the mass number of an atom is the sum of: neutrons only, protons o…
C. Neutrons + protons
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how can we detect atoms even though we cannot see them with our eyes? b…
Using a microscope
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define atoms. particles that make up matter, too small to see but detec…
The smallest unit of a chemical element that retains its properties.
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3. the atomic number of an element equals the number of: neutrons proto…
Protons
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what are some limitations to a model showing matter is composed of atom…
D. The size may not be accurate
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2. the nucleus of an atom contains: clear all ○ only neutrons ○ protons…
Protons and neutrons
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what is it called when a substance is distributed evenly throughout ano…
C. dissolving
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1. the smallest particle of an element that retains its chemical proper…
B. Atom
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what are mixtures? substances that are chemically bonded together to fo…
Combinations of substances that do not lose their identifying characteristics. Examples: soil, concrete, mud puddle.
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9. circle the letter of each sentence that is true about waters surface…
9. a. It helps some insects "skate" across the surface of the water. 10. a. It explains how water moves against the force of gravity. 12. d. It causes clothing to stay dry.
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the nurse working in a long - term care facility notes that an older cl…
1. Urinalysis 3. Chemistry profile 6. Complete blood count
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17. the amount of heat needed to increase the temperature of a certain …
17. True 18. True 19. a. True, b. False, c. True, d. False 20. Water's high specific heat helps regulate body temperature by absorbing and releasing heat to maintain a stable inte…
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question 7 of 10 which sentence is an example of a concrete statement? …
A. I have both a BA and a master's degree in chemical engineering from Tate College in Connecticut.
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which is the best example of how one form of pollution affects another?…
The use of pesticides on plants causes air and water pollution.
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2. one side of the water molecule has a positive charge, while the othe…
2. a. Water is a polar molecule. 3. Hydrogen bonds 4. True 5. Surface tension 6. Surface tension 7. Cohesive forces due to surface tension
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1. circle the letter of each sentence that is true about waters structu…
a. Water is made up of atoms bonded to form molecules. d. The chemical formula for water is H₂O.
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ccc structure and function pots and pans that are used for cooking are …
Metallic bonding gives these metals good heat - conductivity and malleability, making them suitable for cookware.
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question 233 of 25 choose the polar molecule. a. c₂h₄ b. co₂ c. h₂o d. …
C. H₂O
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13 sep construct an explanation gold leaf has been used by artisans sin…
Gold has metallic bonding with a sea - of - electrons model. The delocalized electrons allow gold atoms to slide past each other when pounded, enabling it to be flattened into ext…
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question 222 of 25 which statement is true about energy and bonds? a. w…
B. Energy is absorbed to break bonds.
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questions question 3 of 3 when should you wear the appropriate ppe to p…
When there are chemical hazards present
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question 2 of 3 at what point in the hierarchy of hazard control should…
If the engineering controls don't protect workers completely from a chemical hazard
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question 19 of 25. which statement is not true about the periodic table…
B. Elements in the same column of the periodic table have the same number of electron shells.
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questions 01 02 03 question 1 of 3 who should monitor for chemical haza…
Employer
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11. choose the best answer. ____ helps dissolution by dispersing and ev…
D. Agitation
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12. choose the best answer. examples of alloys include steel, colored g…
12. B. brass 13. A. liquid
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14. choose the best answer. the periodic tables largest group, ____, in…
14. D. transition metals 15. B. surface area of a solute
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question 3 of 3 which of the following are forms that chemical hazards …
A. Mist, B. Gas, D. Liquid, F. Fibers (solids)
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match the following parts of an atom to their description. proton, neut…
Electron - Negatively charged particle that moves around the nucleus Proton - Positively charged particle in the nucleus Neutron - Noncharged particle in the nucleus Nucleus - Com…
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question 10 of 25 which statements are true of noble gases? check all t…
A. They have a full valence shell, B. They do not tend to react
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question 9 of 25. the law of conservation of mass states that in a chem…
A. True
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ccc structure and function when copper wires are made, a copper rod is …
In metallic bonding of copper, there is a sea of delocalized electrons surrounding copper cations. When pulled into a wire, the cations can slide relative to each other while the …
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question 7 of 25 put these elements in order from most electronegative …
Bromine (Br), Selenium (Se), Arsenic (As), Germanium (Ge)
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question 6 of 25. put these atoms in order from most negative overall c…
Atom P, Atom Q, Atom X, Atom B
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question 5 of 25 which of the following are true of the phases? check a…
A. Solids have less kinetic energy than liquids or gases, C. The particles of a gas are not in a fixed location.
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match each element to the correct description of its usual behavior in …
Sodium (Na) - Will lose electrons, Oxygen (O) - Will gain electrons, Argon (Ar) - Does not gain or lose electrons, Silicon (Si) - Could lose or gain electrons
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15. match the descriptions with the terms. these are the smallest parts…
1. atoms 2. protons 3. sublimation 4. dissolution 5. dilution
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graph 4: exposure to chemical releases according to race racial biases …
C. Fewer chemicals are released in areas where white people live
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17. choose the best answer. what elements are in c₃h₈ (propane)? carbon…
B. hydrogen and carbon
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10 sep compare models explain how the bonding model for sodium metal wo…
Sodium metal has metallic bonding with delocalized electrons in a sea around positive sodium ions. Sodium chloride has ionic bonding with a transfer of an electron from sodium to …
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18. choose the best answer. how many atoms are in nh₄no₃? 12 7 9 4
9
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19. choose all that apply. choose two things that scientists include in…
B. chemical symbols C. the number of atoms in a substance
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20. choose all that apply. choose two facts about supersaturated soluti…
- Supersaturation only occurs under specific conditions. - The solution can hold more dissolved solute than it normally can.
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10. choose the best answer. the chart describes characteristics of ____…
C. aqueous solutions
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question 28 of 30 which of the following is an important difference bet…
B. Mass is not always conserved in nuclear reactions.
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8. choose the best answer. which element group conducts heat and electr…
8. C. metals 9. A. mixture
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which answer completes the chart? 26 fe iron 6.941 chemical symbol elem…
atomic number
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5. choose the best answer. the element ____ is found in organic compoun…
5. C. carbon 6. B. a bond
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this painting is by pablo picasso, entitled the blind mans meal. what t…
b. He used a monochromatic color scheme, which occurs when one color predominates, shades of black, tints of white, values of a hue.
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3. choose the best answer. found in air and water, ____ is the earths m…
3. C. oxygen 4. E. both metals and nonmetals
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1. look at the table. then, choose the best answer. which compound has …
sand
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2. choose the best answer. a(n) ___ is created when elements are combin…
A. compound
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which structure defines the sulfhydryl functional group? (1 point) o so…
C. SH
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question 12 of 30. as many as 20% of the cars in brazil can run on pure…
B. Biomass fuel
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which option describes the structure of the electron shells in a neutra…
The inner shell is complete with two electrons. The outer shell is incomplete with four electrons.
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why is carbon said to provide a backbone in many molecules? (1 point) c…
Carbon atoms can form chains and branches with each other and other atoms can attach to these
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question 28 of 28 j.j. thomson discovered the electron by noticing that…
A. a beam of particles could be influenced by an electric or magnetic force.
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question 4 4 pts which of the following measuring devices (used in your…
An analytical balance ### Question 5
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question 27 of 28 in a solution of water and table salt, what is the ta…
A. Solute
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question 26 of 28 what did john dalton theorize? a. all chemical reacti…
A. All chemical reactions are a rearrangement of atoms.
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question 25 of 28 which of the following is the correct balanced equati…
D. H₂CO₃ → H₂O + CO₂
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question 24 of 28. which of the following is true of atoms with very hi…
D. They have a strong tendency to take electrons from other atoms.
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question 222 of 228. the following is a partial chemical equation:? → 2…
B. The reactants include 4 hydrogen atoms and 2 oxygen atoms.
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question 21 of 28 which of the following is the correct balanced equati…
C. H₂O₂ → H₂ + O₂
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question 20 of 28 what type of bond is most likely to form between two …
C. Covalent bond
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chemistry is the study of... matter, its properties, its behavior, how …
matter, its properties, its behavior, how it is arranged, and how it changes.
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question 19 of 28 how does chemistry affect sports? a. data can be coll…
B. Safety equipment is made of synthetic materials that are lightweight yet strong.
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question 18 of 28. which of the following is a nonpolar molecule? a. a …
C. A nitrogen molecule (N₂)
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the elements in the first group have one valence electron and are extre…
alkali metals
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multiple - choice question what phase change is represented at 5, solid…
melting
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question 17 of 28 between what types of elements do ionic bonds usually…
C. A metal and a nonmetal
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question 16 of 28 in what kind of reaction does a compound break down i…
B. Decomposition
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question 15 of 28. several dyes were mixed together and dissolved in wa…
B. By using chromatography
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question 7 warm air... a is less dense than cool air. b has molecules t…
Question 7: A. is less dense than cool air. Question 8: A. more due to migrating weather systems., B. more at the poles daily than at the equator., C. due to the heat from the Sun.
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question 14 of 28. scientists can use chemicals to clean toxins from th…
A. Chemicals can be used to help the environment.
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multiple - choice question sublimation is... the change directly from a…
The change from a solid directly to a gas, bypassing the liquid stage.
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question 13 of 28 in what kind of reaction do hydrogen gas (h₂) and oxy…
B. Combination
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toma notas sobre la cronología de la teoría atómica. concéntrate en lo …
No se proporciona una respuesta concreta en este formato, sino que se dan las instrucciones para la tarea de tomar notas sobre la teoría atómica.
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question 12 of 28. as much sugar as will dissolve is added to hot water…
A. Supersaturated
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question 11 of 28 which of the following is a homogeneous mixture? a. c…
D. Skim milk
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question 10 of 28 what kind of reaction has the general form a + b → ab…
B. Combination
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dy campbell changes of state | matter | physics | fuseschool multiple -…
Water vapor in the air has cooled down to form liquid droplets of water.
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question 9 of 28 which of the following best expresses the law of conse…
C. In a chemical reaction, the mass of the products equals the mass of the reactants.
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this painting is by pablo picasso, entitled the blind mans meal. what t…
b. He used a monochromatic color scheme, which occurs when one color predominates, shades of black, tints of white, values of a hue.
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question 8 of 28 which of the following is an example of how the same c…
C. Excess fertilizers run off into rivers and create a dead zone.
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question 7 of 28 which of the following best describes an atom that doe…
A. The atom may gain, lose, or share electrons to fill its valence shell
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air temperature is related to air pressure in that...(select all that a…
A. increasing temperature would increase the energy of the molecules, thus increasing the pressure B. increasing temperature would increase the velocity of the molecules, thus inc…
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question 6 of 28 which mixture can be separated based on the density of…
A. Oil mixed with water
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how would adding molecules to a container affect the air pressure in th…
B. It would increase the total amount of molecules striking the boundary of the container
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question 5 of 28 what kind of reaction is most likely to stop when you …
C. Combustion
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question 4 of 28 in a lewis structure, what does a double line represen…
C. A double covalent bond
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why is air pressure greater at the earths surface? a pressure is actual…
B. Gravity pulls more molecules toward the Earth's surface.
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question 3 of 28 a chlorine (cl) atom has 7 valence electrons. which of…
C. Gain 1 electron
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question 1 air pressure...(select all that apply) a will decrease when …
B. is the force exerted on a surface by air molecules. D. gets less as you get higher in the atmosphere.
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question 2 of 28 what is the strongest force that exists between molecu…
C. Dipole-dipole forces
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question 1 of 28 which best explains the effect of chemicals on the env…
A. Chemicals can be helpful or harmful to the environment.