化學
化學反應、化學計量、分子結構與元素性質。
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read the poem. skimming the bottom in the company of toes, i observe th…
B. abcb
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experimental data a student mixed four white colored solids into separa…
formation of a gas
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the difference between two marked values is 5 ml and there are 5 spaces…
1 mL (Option: 1 mL)
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the calibration of this graduated cylinder is 50 ml. we can estimate to…
740 mL (assuming the option is, for example, B. 740 mL)
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suppose you have a graduated cylinder with a calibration of 10 ml. how …
C. to the nearest 1 milliliter (Note: Assuming the third option is labeled C; if the original options have labels like A, B, C, D with the third being "to the nearest 1 milliliter…
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what does this symbol (a red diamond with a black exclamation mark insi…
The chemical is an unhealthy kinds (irritant). (Assuming the last option is "The chemical is an unhealthy kinds (irritant)" as per typical GHS symbols; if the options were, e.g., …
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which of these is a common use for a ring stand? it is used for support…
It is used for supporting glassware during heating or filtering.
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what is this piece of lab equipment? clay triangle volumetric flask rin…
C. ring stand
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what is the purpose of a funnel? it creates a specific concentration an…
B. It allows for catching and directing the flow of liquids. (Here we assume the second option is labeled as B. If the original options had different labels, adjust accordingly ba…
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what is the piece of equipment the arrow is pointing to? a beaker a fun…
B. a funnel
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which of these is an example of chemistry you might find at a baseball …
D. a baseball made of rubber
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which type of chemistry studies the interactions of atoms and molecules…
B. Biochemistry
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101. a student makes the following claim: \differences in properties ca…
b. Diamond and graphite; two different structural forms of \( \text{C}_4\text{H}_{10} \)
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the half-life of a certain tranquilizer in the bloodstream is 38 hours.…
\(5.8\)
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83. a student compares diamond, graphite, and two different $\\ce{c4h10…
d. Diamond and graphite are allotropes; the \( \text{C}_4\text{H}_{10} \) compounds are isomers. ### Question 84
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the half-life of the radioactive element unobtanium-53 is 5 seconds. if…
20
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73. a student claims that the nh₄cl(aq) solution formed is a homogeneou…
b. The \( \text{NH}_4\text{Cl} \) dissolves into ions that are evenly distributed throughout the water. ### Question 74
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71. a chemist claims that calcium oxide is ionic because of the large e…
a. \(|1.0 - 3.4| = 2.4\), indicating a large difference consistent with ionic bonding ### Question 72
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68. a student analyzes the halogens f, cl, br, and i and claims that th…
d. Additional occupied energy levels are added as the atomic number increases, placing valence electrons farther from the nucleus and increasing the atomic radius. ### Question 69
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49. which phrase describes a specific compound? 1 a. can contain only o…
c. is composed of elements chemically combined in a definite ratio ### Question 50
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45. as an atom in the ground state changes to an atom in an excited sta…
a. absorbs energy ### Question 46
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18. what is ionization energy, and how does a larger electrostatic forc…
Ionization energy is the energy required to remove an electron from a gaseous atom/ion. A larger electrostatic force between nucleus and electron increases the ionization energy (…
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what are examples of short-term goals? check all that apply. □ maddox s…
- Maddox studies hard because he wants to get an "A" on his chemistry quiz. - Clara wants to take a year - long Spanish class. - Aden wants to get a summer job during his school v…
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in the periodic table, what is the formal term for the horizontal seque…
B. Periods
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consider a solution with a ph of 3. how would you describe this solutio…
Acidic (the option labeled "Acidic")
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what is the first step in ipm? burn the entire crop field monitoring an…
monitoring and assessing pest levels
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how should chemical pesticides be used in integrated pest management? f…
C. sparingly, with the aim of controlling pests (assuming the options are labeled A - D with A: for complete pest extinction, B: liberally and frequently, C: sparingly, with the a…
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which of these terms describes a pesticide that does not break down eas…
A. persistent
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pesticide use and misuse pesticide use and misuse use the following sce…
The correct option (assuming the option with "biomagnification" is one of them, likely the intended answer) is the one labeled with "biomagnification" (exact option label depends …
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which of the following is a popular pesticide used in both world wars? …
DDT
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what does organic agriculture avoid using? natural fertilizers traditio…
C. synthetic pesticides and fertilizers
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structure of poetry quick check if by rudyard kipling if you can talk w…
ABAB CDCD
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structure of poetry quick check what is a structural characteristic of …
Many lines or stanzas begin with the same word or phrase.
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structure of poetry quick check what is a quatrain? (1 point) ○ a group…
a group of four lines of poetry with the same rhyme scheme
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what is the aesthetic impact of a poem? (1 point) ○ the meter and rhyme…
B. how the poem affects the reader's senses
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structure of poetry quick check what is rhyme scheme? (1 point) ○ the o…
A. the ordered pattern of rhymes at the ends of lines of a poem
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11 state one commercial use of calcium oxide 12 the following data give…
One commercial use of Calcium Oxide is in the manufacture of cement (or as a desiccant, in steel production, or for soil liming). ### Question 12(a)
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name: campus: science: how air conditioners make cities hotter u4l2.2 t…
Container C ### Question 2
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what is the method for organizing elements in the periodic table? only …
A. only the atomic number of an element
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1 mole = 6.022 × 10²³ particles. what is this quantity is known as? ○ a…
B. Avogadro's number
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fritz habers synthesis of ammonia from atmospheric nitrogen—a process t…
B. admired
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directions: identify another chemical reaction that is important to you…
An important chemical reaction in daily life is the combustion of gasoline in vehicles. The general reaction for a hydrocarbon (like octane, \(C_8H_{18}\)) in gasoline is \(2C_8H_…
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answer the following question in 3-4 complete sentences. compare and co…
Bronze is a copper - tin alloy, and iron is a pure elemental metal. Both were vital in historical metallurgy, with bronze used in the Bronze Age for workable tools/art and iron (I…
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compare and contrast bronze and iron.
### Similarities: - Both are metals used in historical tool - making, construction, and weapon - making, playing key roles in technological development (e.g., Bronze Age and Iron …
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answer the following question in 1-2 complete sentences. define metal. …
A metal is a shiny, malleable, ductile, and good heat/electricity - conducting substance; the four primary types of metal are ferrous metals, non - ferrous metals, precious metals…
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answer the following question in 3-4 complete sentences. describe the p…
Silver is a shiny, white - metallic element with high electrical/thermal conductivity, malleability, and ductility. Historically, it served as currency to facilitate trade, was us…
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select the correct answer. which of the following is an example of econ…
D. a Japanese store selling tea and spices from South Asia
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select the correct answer. which action prompted the start of the persi…
B. Saddam Hussein's invasion of Kuwait
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) \(\boldsymbol{3.54\times10^{-5}}\) moles per L (b) \(\boldsymbol{9900}\) pounds
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activity a: energy of chemical bonds get the gizmo ready: - check that …
If the surrounding water’s temperature increased, heat energy (enthalpy) is released. This is because the rise in water temperature indicates that the reaction transferred heat to…
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student exploration: reaction energy vocabulary: calorimeter, chemical …
### Prior Knowledge Questions 1. **Answer Explanation**: To separate two stuck magnets, you need to apply a force that overcomes the magnetic attraction between them. This usually…
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convert 587 k to degrees c. ? °c
$313.85$
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convert 36.30 °c to °f. 36.30 °c = ? °f
\(97.34\)
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which unit would you use to measure the time a chemical reaction takes?…
A. seconds
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which si unit is used to measure the number of atoms in different eleme…
B. moles
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a nursing assistant needs to dispose of chemicals that were used during…
the material safety data sheet
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match each term with its definition. material safety data sheet occupat…
- material safety data sheet → information on a chemical’s hazards, handling, and disposal - Occupational Safety and Health Administration → a government division that ensures saf…
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annotation requires the following 1. number paragraphs 2. write a summa…
### Paragraph Numbering and Summaries: 1. **Paragraph 1** *Summary*: Explains chemical bonds as forces holding atoms in compounds, involving electron transfer or sharing. 2. **Par…
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fault-tolerant quantum computers rely on magic state distillation, whic…
B. constant - overhead magic state distillation is achievable in principle, resolving the long - standing scaling problem while leaving the practical construction of such large, c…
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many people discover that attempts to bleach sunscreen marks off clothi…
A. chemically informed redesign of UV filters like DHHB can yield sunscreens that withstand bleach without producing vivid red by - products, preserving effective photoprotection …
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which clue can be used to identify a chemical reaction as a decompositi…
The reaction has a single reactant
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which type of reaction is nacl + agno₃ → nano₃ + agcl? synthesis decomp…
replacement (The reaction \( \text{NaCl} + \text{AgNO}_3 ightarrow \text{NaNO}_3 + \text{AgCl} \) is a double - replacement reaction, and among the given options, "replacement" is…
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a chemist dissolved crystals of an unknown substance into water at room…
A. Solubility
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which statements are true of heterogeneous mixtures? 1) they settle out…
1) They settle out
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henry mixed salt and water together in a cup until he observed a clear …
(Assuming the correct option is the one stating Henry is incorrect, e.g., "He is incorrect. Dissolving salt in water and evaporating water are physical changes; no chemical change…
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answer the following (a) a certain solution has a hydrogen ion concentr…
\( 0.00000589 \) ### Part (b)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \( 2F_2(g) + O_2(g) ightarrow 2OF_2(g) \)
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 F_2(g) + O_2(g) \to 2 OF_2(g)\)
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no, that play would have you a part of the pattern. which of these play…
B) Duo
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13. an atom with electron arrangement 2–8–7 will most likely: * - becom…
A. Become bigger when it gains electron
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19. explain why the element carbon (c) has a weaker pull on a bonded el…
Carbon has a weaker pull on bonded electrons (lower electronegativity) than Nitrogen because, in the same period (Row 2), Nitrogen has a greater nuclear charge (higher atomic numb…
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15. potassiums (ks) first ionization energy is 419 kj/mol. its second i…
The first ionization of K removes the 4s¹ electron (valence, far from nucleus, shielded). After first ionization, K⁺ has [Ar] configuration. Second and third ionizations remove el…
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13. an atom with electron arrangement 2-8-7 will most likely: * become …
A. Become bigger when it gains electron ### Question 14
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11. which of the following will have a smaller radius than its neutral …
B. K ### Question 12
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9. when an atom loses an electron to become a positive ion, what proces…
D. Ionization ### Question 10
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7. fluorine (f) is much more electronegative than hydrogen (h). in a bo…
Fluorine, because it has a higher electronegativity. ### Question 8
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5. why does electronegativity increase when you move from left to right…
C. The number of protons in the nucleus increases. ### Question 6
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5. why does electronegativity increase when you move from left to right…
C. The number of protons in the nucleus increases.
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thermal insulators - rubber - wood - plastic - fiberglass - foam therma…
A. Plastic
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i. aumentar la temperatura del solvente a permite que todos los solutos…
La sustancia A se disolverá más rápidamente en el solvente A a temperaturas más altas (la primera opción, con el círculo correspondiente).
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which statements are true of heterogeneous mixtures? 1) they settle out…
1 and 2
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which statement best describes how a catalyst can speed up a chemical r…
The catalyst decreases the activation energy needed
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one half of a balanced chemical equation is shown 3mg(oh)₂ + 2h₃po₄ whi…
3 Mg, 2 P, 14 O, 12 H
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consider the combustion reaction for acetylene. $$2\\ce{c2h2(l)} + 5\\c…
B. \(\text{O}_2\) (assuming the options are labeled with \(\text{O}_2\) as the correct choice for limiting reactant)
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25. (q-2,6b) qaysi alkin gidratlansa, etanal ch₂cho hosil boladi? a) pe…
D. Asetilen ### Question 26
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24. (q-2,6b) etin c₂h₂ molekulasidagi uglerod atomlari orbitallari qand…
B) \( \text{sp} \)
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19.(b-2b) qaysi modda eitlen bilan ni katalizatorligida qizdirilganda r…
C. Vodorod ### Question 20 (20.(B-2b))
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17.(b-2b) alkinlarning umumiy formulasini koʻrsating. a) $\\ce{c_{n}h_{…
A) \( \boldsymbol{C_nH_{2n-2}} \) ### Question 18
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planetary scientists have long relied on the giant impact hypothesis to…
B. It presents a model that two researchers developed to account for the chemical similarity noted earlier in the passage.
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the image below shows the bohr model and electron configuration for an …
The element has an atomic number of 20 (calcium, \( Ca \)). It is located in **period 4, group 2** of the periodic table.
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examine the electron configuration below. if this were an ion with a +1…
C. sodium
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question 6 listen what do the electron configurations for fluorine, chl…
A. They all end in $\boldsymbol{p^5}$.
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which of the following elements has the electron configuration shown be…
B. potassium
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examine the electron configuration below. if this were a neutral atom, …
C. neon
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question 3 listen which of the following best describes a trait element…
B. Elements in the same period have the same number of energy levels housing their electrons.
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complete the following practice problems. answers are at the bottom of …
The concentration is approximately $\boldsymbol{0.232\ \text{M}}$. Now problem 2: "Determine the concentration of 1.58 moles of solute in 750 mL."
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question 11 of 12 which of the following statements about the informati…
B. The same information is always presented in the same order.
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question 10 of 12 which of the following correctly describe(s) oshas ha…
B. It was created to help reduce the risks of working with hazardous chemicals. D. It has been revised several times to maintain alignment with the United Nations' Globally Harmon…
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question 9 of 12 the release of, or exposure to, hazardous chemicals ca…
A. Cancer B. Burns and rashes C. Fires and explosions D. Damage to the heart
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question 8 of 12 which of the following is a requirement of employers w…
D. All of the above.