Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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what types of elements do covalent bonds occur between? metals a metal …
C. nonmetals
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which description best describes a diatomic/elemental molecule? made up…
made up of 2 or more of the same kind of atom that are chemically bonded
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what types of elements do ionic bonds occur between? metals only metals…
B. metals and nonmetals
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c₆h₁₂o₆ is an example of a... heterogenous mixture homogenous mixture c…
D. chemical formula
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balancing chemical equations balance the equations below 1) __ n₂ + __ …
1. $N_2+3H_2 = 2NH_3$ 2. $2KClO_3=2KCl + 3O_2$ 3. $2NaCl+F_2 = 2NaF+Cl_2$ 4. $2H_2+O_2 = 2H_2O$ 5. $Pb(OH)_2 + 2HCl=PbCl_2+2H_2O$ 6. $2AlBr_3 + 3K_2SO_4=6KBr+Al_2(SO_4)_3$ 7. $CH_…
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question 46 one potential reason why women and certain ethnic groups ar…
They produce less aldehyde dehydrogenase than other groups.
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what is the hybridization of c in the molecule? part 2 of 2 which struc…
Part 1: $sp^{2}$ Part 2: The first structure ($\ce{FHC=CFH}$)
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the c₂h₂f₂ molecule can exist in either of the following two forms: par…
Part 1 of 2: $sp^2$ Part 2 of 2: The first structure
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select the dependent clause. after a lightning bolt passes through the …
After a lightning bolt passes through the air
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elements, compounds, & mixtures retake classify each of the pictures be…
1. A 2. B 3. E 4. C 5. A 6. C 7. E 8. B 9. A
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vocabulary match each term below to its most accurate definition. a. at…
16. a. Atom 17. e. Mixture 18. c. Element 19. b. Compound 20. d. Molecule
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select the dependent clause. some farmers prefer organic fertilizers be…
because they enrich the soil and are free of harmful chemicals
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select the dependent clause. frozen foods may lose water molecules and …
unless they are wrapped tightly
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elizabeth i learned history, mathematics, geography, astronomy and even…
D. Linguistics
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4 ccc scale, proportion, and quantity identify the number of protons an…
Fluorine: Protons = 9, Electrons = 9; Iodine: Protons = 53, Electrons = 53
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rle schemes often start each row with the number of white pixels, but h…
B. T
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ccc scale, proportion, and quantity identify the number of protons and …
Fluorine: Protons = 9, Electrons = 9; Iodine: Protons = 53, Electrons = 53
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a mental map or outline of the way you think about something is _____. …
B. a schema
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properties can be observed only when substances are changing into diffe…
First question: Chemical Second question: Change in color, Formation of a precipitate, Evolution of gas
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3 ccc scale, proportion, and quantity which subatomic particles account…
Protons and neutrons account for most of an atom's mass; electrons account for most of an atom's volume.
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butane gas has a density of 2.54 kg/m³. air has a density of 1.22 kg/m³…
Sink
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a ____ is a practical person * 10 points pragmatist theorist realist sc…
1. A. Pragmatist 2. D. critical thinking
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butane gas has a density of 7.56 kg/m³. air has a density of 1.27 kg/m³…
1. True 2. False
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charlie takes a supplement that is labeled as atural.\ what does this l…
Nothing; "natural" is not verified by anyone.
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calculating average atomic mass - round average atomic mass to 3 decima…
1. $14.004$ 2. $39.985$ 3. $117.755$ 4. $82.986$
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given this table of electronegativities: atom electronegativity h 2.2 c…
$CO_2<NI_3<HI<NH_3$
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using the vsepr model, predict the electron domain geometry and the mol…
Part 1 of 4 ClF₃ Electron Domain Geometry: trigonal bipyramidal Molecular Geometry: T - shaped Part 2 of 4 SeCl₆ Electron Domain Geometry: octahedral Molecular Geometry: octahedral
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question 1 (2 points) ________ is the process of focusing awareness on …
Question 1: D. Attention Question 2: D. photoreceptors
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how many protons does this atom have? how many neutrons does this atom …
Number of protons: <Count of blue + spheres in nucleus> Number of neutrons: <Count of red spheres in nucleus> Number of electrons: <Count of green spheres outside nucleus>
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an atomic scientist was studying an atom and through experimentation fo…
This atom has nine electrons.
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which statement(s) correctly compare the masses of protons, neutrons, a…
Protons and neutrons have similar mass. Electrons are smaller than a proton or a neutron.
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a venn diagram shows the similarities and the differences of two things…
A. Found in the nucleus E. Has mass of one amu
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8) write the nuclear symbols for both atoms: 9) explain why they are or…
8) First atom: $_{5}^{10}B$, Second atom: $_{5}^{11}B$ 9) They are isotopes because they have the same number of protons (5) but different numbers of neutrons (5 and 6).
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knowing what you know about the nucleus and the subatomic particles in …
Positive
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1) the polypropylene cubes have a density of 0.946 grams per milliliter…
1. A. The cube floats on water because the water’s density is greater than the cube’s density, B. The cube sinks in methanol because methanol’s density is less than the cube’s den…
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7) element x has 3 isotopes. one isotope has a mass of 127.0 and is fou…
$126.86$
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objective 5: rewind your mind 1. how are minerals place into families/g…
1. Based on chemical composition and crystal structure. 2. Igneous, sedimentary, and metamorphic. 3. Melting of metamorphic rock into magma; when magma cools to form igneous rock,…
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an element has the following isotopes: abundance mass/amu 1.40% 203.973…
208.22 amu Bi
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jaiden is writing a report about the structure of the atom. in her repo…
No, because an atom has three sub - atomic particles (protons, neutrons, electrons), not two as stated.
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19. 0 / 1 points sulfur has four isotopes: sulfur 32 (31.97207 amu, 95.…
$32.06383$
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physical and chemical properties physical properties are observable and…
1. Physical Property 2. Physical Property 3. Chemical Property 4. Physical Property 5. Chemical Property 6. Physical Property 7. Physical Property 8. Physical Property 9. Physical…
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6) determine the average atomic mass of the isotopes in the data table …
$10.811$
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element information section answer the following questions. use proper …
a. There are 8 protons and 8 neutrons in the nucleus. b. There are 2 electrons in Energy Level (Shell) 1. c. There are 6 electrons in Energy Level (Shell) 2. d. There are 0 electr…
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sep develop models each helium atom has two protons. sketch models of h…
Sketch a model of helium - 3 with 2 protons, 1 neutron in the nucleus and 2 electrons in electron - shells. Sketch a model of helium - 4 with 2 protons, 2 neutrons in the nucleus …
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sep develop models each helium atom has two protons. sketch models of h…
Sketch a model of helium - 3 with 2 protons, 1 neutron, and 2 electrons. Sketch a model of helium - 4 with 2 protons, 2 neutrons, and 2 electrons, labeling protons, neutrons, and …
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5) pure nitrogen is found as a mixture of 2 isotopes, n - 14 and n - 15…
The percent abundance of N - 14 is 99% and the percent abundance of N - 15 is 1%.
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4.) why is mass number a whole number, but atomic mass a decimal number?
The mass number is a count of protons and neutrons (whole entities), while atomic mass is a weighted - average of isotope masses, leading to a decimal value.
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3.) what are two characteristics atomic isotopes differ in: a) ________…
a) Mass - number b) Atomic mass
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fill in each blank with a word from the vocabulary in the reading passa…
1. subatomic 2. neutron 3. charge 4. chemical 5. electron 6. atom 7. meitnerium 8. mass 9. Periodic 10. hydrogen 11. nucleus 12. particles 13. protons 14. elements 15. matter
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2. what are two characteristics atomic isotopes must have in common: b)_
a) Number of protons b) Chemical properties
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explaining the importance of stud based on what you have just read, why…
Studying atoms and their parts and particles is helpful for understanding matter, advancing in medicine, materials science, energy, and developing new technologies to solve enviro…
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1. explain why the beans could be compared to atomic isotopes?
Beans can be compared to atomic isotopes because different - sized or - weighted beans can represent isotopes of an element, similar to how isotopes of an element have similar che…
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which atom is being researched as a possible ingredient of magnetic soa…
D. iron
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question 1 2 pts which is the most compelling reason parents should int…
Food allergies may present
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6 sep use mathematics complete the table by identifying the atomic numb…
| Atom | Atomic number | Mass number | Protons | Electrons | Neutrons | | ---- | ---- | ---- | ---- | ---- | ---- | | $\ce{^{23}_{11}Na}$ | 11 | 23 | 11 | 11 | 12 | | $\ce{^{32}_{…
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use the information from the reading passage to answer the following qu…
1. Protons, neutrons, electrons 2. Protons, neutrons 3. Hydrogen, oxygen, carbon 4. The number of protons 5. 8 6. The number of protons in an atom's nucleus 7. The sum of protons …
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sep use mathematics complete the table by identifying the atomic number…
| Atom | Atomic number | Mass number | Protons | Electrons | Neutrons | |---|---|---|---|---|---| | \(_{11}^{23}Na\) | 11 | 23 | 11 | 11 | 12 | | \(_{16}^{32}S\) | 16 | 32 | 16 | …
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19. a family goes camping and creates a fire to roast marshmallows. the…
19. C. The ashes cannot be put back together to create a log again. 20. C. The process cannot be reversed.
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practice and apply use complete sentences to answer each question, show…
1. They hoped to project strength and dignity. 2. Because it could weaken the community and increase vulnerability. 3. To build discipline, strength, and necessary values and skil…
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which is an example of a chemical change? a baking a cake b. freezing w…
1. A. baking a cake 2. C. an ice cube melting 3. A. physical 4. D. Ice melting is a physical change because it may be reversed.
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11. which best explains why melting ice is a physical change instead of…
11. C. It does not form a new substance. 12. A. A physical change occurs, because the water changes form. 13. D. A physical change occurs because water and vapor are different sta…
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match the vocabulary word to its definition. neutron a neutral particle…
neutron - a neutral particle located in the nucleus of an atom nucleus - the central part of the atom containing protons and neutrons proton - a positively charged particle locate…
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which example best describes a chemical change? a wax melting b an appl…
6. B. an apple turning brown 7. C. breaking an egg 8. D. It was a chemical change, because rust is a new substance on the metal. 9. A. A piece of wood is burned and turns to ash. …
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1 which example best describes a physical change? a baking a pie b burn…
1. C. making a paper airplane 2. A. crayons melted; changed from solid to liquid 3. C. chocolate left in a warm car to melt 4. A. The basketball’s shape is changed. 5. B. baking c…
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9. as the gas in a rigid container is heated, its a. pressure increases…
9. a. pressure increases. 10. b. flows quickly. 11. volume 12. high; low 13. Chemical 14. Sublimation 15. law of conservation of energy 16. True 17. False (New substances are form…
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write the letter of the correct answer on the line at the left. 1. the …
1. a. temperature 2. d. definite volume 3. b. condensation 4. b. becomes softer and softer as temperature rises 5. c. volume decreases 6. d. water droplets form on a mirror 7. c. …
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8. a chemical bond is a. a group of atoms that are joined together. b. …
8. c. the force that holds two atoms together. 9. d. burning leaves 10. a. They are composed of molecules. 11. molecule 12. density 13. length 14. element 15. ore 16. False. Durin…
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multiple choice write the letter of the correct answer on the line at t…
1. a. boiling point 2. b. volume 3. d. by heating iron ore and a source of carbon 4. c. different samples have different properties 5. a. mass 6. c. never change 7. d. solution
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identify the parts of the atom that are labeled in the diagram. label a…
Label A: Nucleus Label B: Electron
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what fraction of the daughter material exist after 2 half - lives? obje…
\(\frac{3}{4}\) 1. # Brief Explanations: Minerals are grouped based on their chemical composition and crystal structure. For example, silicates are minerals that contain silicon a…
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the pronoun in bold is not vague. select its one clear antecedent. nine…
Ninety - two chemical elements
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the reasoning below is... claim: humans enjoy interacting with pets bec…
Weak Reasoning: Doesn't Connect the Evidence to the Claim
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remember the amount of energy going in to a system must equal the amoun…
Microwave: 5000 J thermal energy out; Lamp: 2400 J light energy out; Heater: 2000 J electrical energy in; Bus: 2500 J thermal energy out; Singer: 483 J mechanical energy out; Rock…
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9 multiple choice 4 points which of these individuals criticized the us…
9. Dr. Richard Harlan criticized the use of common preservatives such as arsenic in regards to embalming. 10. Without specific historical context, it's hard to say for sure, but l…
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15. the graph above shows how a particular real gas deviates from ideal…
D. $SO_2$, because it has the largest molecular volume. ### 16.
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physical and chemical changes understanding main ideas check the type o…
1. Physical Change 2. Chemical Change 3. Physical Change 4. Physical Change 5. The total amount of energy is conserved in both physical and chemical changes according to the law o…
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13. equimolar samples of ch4(g) and c2h6(g) are in identical containers…
13. B. $C_{2}H_{6}$ molecules have a larger, more polarizable electron cloud than $CH_{4}$ molecules do. 14. D. $CO_{2}$ is a nonpolar molecule that has London dispersion intermol…
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which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech.
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look at these details from a paragraph about the same topic: scientists…
Goggles are worn to protect people's eyes during different activities.
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how much of a 12 m hcl solution is needed to prepare 20.0 l of a 0.25 m…
$0.42\ L$
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1. solute a. the part that dissolves into the solution. 2. solvent b. t…
1. Solute: A. The part that dissolves into the solution. 2. Solvent: B. The part that dissolves something. 3. Covalent: C. Compounds made up of two non - metals. 4. Ionic: D. Sinc…
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look at these details from a paragraph about the same topic: touching a…
Coral reefs face various threats.
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multiple choice question chemical reactions leading to the yearly destr…
a drop in air temperatures
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8. a rectangular - shaped piece of wood has a length of 10.71 cm, a wid…
The density of the piece of wood is approximately $0.60$ g/mL.
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part 1 (1 point) rus ruthenium (ii) sulphide part 2 (1 point) pdcl₂ pal…
Tungsten(VI) oxide
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chemistry: unit #1 exam study guide • how many milligrams are in 15 kg?…
1. 1.5×10^7 mg 2. Meter, gram, liter, second, Celsius etc. 3. 126000 s 4. 28.6 mL 5. 236.15 K 6. 416.5 g 7. 8.1% 8. 5 9. 4 10. 5 11. 3.660 kg 12. 1123 cm³ 13. Solid, liquid, gas 1…
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eleanor had an answer for everything—but she still managed to evade mos…
C. avoid or try to avoid fulfilling, answering, or performing
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5. a liquid has a volume of 19.55 ml with a mass of 13.00 grams does no…
The liquid will FLOAT on top of the water because its density (0.66 g/mL) is less than the density of water (1.00 g/mL).
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select the correct answer. which of these elements is rarely found in o…
C. barium
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select the correct compound. reactants undergo chemical reaction to for…
The coefficient of $O_2$ (i.e., 10) is incorrect.
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question (3 points) give the chemical names of the name oxides that hav…
Part 1: manganese(II) oxide Part 2: manganese(III) oxide Part 3: manganese(IV) oxide
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1. helium, like other noble gases, has a full, and therefore stable, ou…
1. Helium has 2 electrons in its outermost shell. Other noble - gas elements (except helium) have 8 electrons in their outermost shell. The difference is due to the fact that heli…
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select the correct answer. dorothy works as a medicinal chemist in a ph…
D. to research molecules in spider venom for new pain medication
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4. a flask that weighs 435.8 g is filled with 225 ml of carbon tetrachl…
$1.19$ g/mL
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select the correct answer. the periodic table houses noble gas elements…
C. Their outermost shell has the maximum number of electrons that it can hold.
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how does the reactivity of neon (atomic number 10, period 2, group 18) …
Neon is unreactive because it has a full outer - shell electron configuration (2, 8), which is a stable state. Sodium is reactive because it has one valence electron (electron con…
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2. a student stirs sugar into iced tea. which two statements describe t…
A. The sugar dissolves but remains the same substance. C. This is a physical change since the sugar could be recovered.
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an element has six valence electrons. which ionic charge will its ion c…
2 -
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which structure defines the hydroxyl functional group? (1 point) nh2 oh…
OH
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how many electrons can carbon accept from other atoms while bonding? (1…
four