Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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what does having a cooling sensation after squeezing a cold pack indica…
The reaction changes in energy.
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when a candle burns, soot forms on a knife held over it. which indicati…
A new solid forms as the candle burns.
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question: how does the radius of an atom affect the ability of the prot…
# Explicación detallada: ## Paso 1: Comprender la interacción entre protones y electrones Los protones en el núcleo tienen carga positiva y los electrones en las capas externas ti…
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what does fizzing from dropping hydrochloric acid onto a piece of limes…
The reaction produces a gas.
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what does the formation of a cloudy white mixture when silver nitrate i…
The reaction forms a precipitate.
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question: how does the radius of an atom affect the ability of the prot…
# Explicación paso a paso: ## Paso 1: Comprender la relación entre radio atómico y fuerza de atracción La fuerza de atracción entre los protones en el núcleo y los electrones de v…
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match the atom to its numbers of protons, neutrons, and electrons. colu…
1. a. Carbon - 12 2. c. Carbon - 13 3. e. Carbon - 14 4. b. Oxygen - 16 5. d. Oxygen - 18
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question 2 (10 points) listen what is the molarity of 2.00l of a soluti…
B. 5M
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select the correct locations on the periodic table. which two elements …
Elements in the same group of the periodic table.
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what makes isotopes of the same element different? a number of neutrons…
1. a. Number of neutrons 2. c. 8 3. b. Oxygen - 18
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4. how many grams of ammonium chloride are formed when 3.1 l of hydroge…
The mass of ammonia that reacts is $2.387\ g$ and the mass of ammonium chloride formed is approximately $7.51\ g$.
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ionic bonds form when atoms: a share neutrons b give away or accept ele…
For the first question: B. give away or accept electrons For the second question: D. share electrons
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procedure part 2 : expanded octet lewis structures several species cont…
| Formula | Name | # of valence e⁻ | e⁻ used in single bonds | Remaining e⁻ | |---|---|---|---|---| | $[PO_4]^{3 -}$ | phosphate anion | 32 | 8 | 24 | | $[SO_4]^{2 -}$ | sulfate a…
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drag each label to the correct location. classify each characteristic a…
| Metal | Nonmetal | |--|--| | shiny surface, good conductor of electricity, good conductor of heat, malleable | dull surface, poor conductor of electricity, poor conductor of hea…
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8. list 5 possible sources of chemical contaminants: 1 - 2 - 3 - 4 - 5 …
8. 1. Industrial chemicals 2. Pesticides 3. Cleaning agents 4. Additives in food - contact materials 5. Naturally - occurring toxins 9. 1. Glass fragments 2. Metal shavings 3. Pla…
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for groups 1, 2 and 13 - 18 on the periodic table, we can easily tell h…
number in the ones place of the group number
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why is it important to know the number of valence electrons an atom has…
To determine which elements will combine easily.
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what is the goal of every atom? choose the best answer. to be free to h…
To have 8 valence electrons so its valence shell is full
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an element is best described as: a a substance composed of molecules on…
D. A pure substance made of only one type of atom
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identify bohrs model of the atom. his model describes the reactivity of…
D. The image with electrons in circular orbits around a nucleus
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11. extend your thinking: the gizmo enables you to examine ions, or ato…
A. El ion Na⁺ es más pequeño que el átomo neutro de Na debido a la pérdida de un electrón y una atracción más fuerte de la carga nuclear sobre los electrones restantes. B. El ion …
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select the correct answer. daltons completing an investigation in the s…
A. boiling point
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read the text. when a person ingests caffeine, whether in the form of a…
sequential
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unit 1 lesson 3 vocabulary circle the term that best completes the sent…
1. substance, property 2. dissolve, mixture 3. soluble 4. insoluble 5. dissolve, mixture
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a chemist is trying to identify a sample of metal that is listed in thi…
D. silver
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group 1 1 h 1.008 2 3 li 4 be select the correct answer. in the periodi…
C. Each element is an alkaline earth metal.
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what happens if you add more solute to a saturated solution? what happe…
- If you add more solute to a saturated solution: The additional solute will not dissolve and will remain undissolved at the bottom of the container. - If you add more solute to a…
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select the correct answer. salt is dissolved in a flask of tap water. d…
D. thermal energy
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circle all of the solutions salt water sugar water drinking water orang…
1. Salt water, sugar water, orange juice, steel 2. Add more water. 3. The excess solute will crystallize out. 4. The larger particles separate and accumulate at the bottom. 5. A) …
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50 ml of a solvent can hold 80 g of a solute, are the following saturat…
35 g: Unsaturated 82 g: Supersaturated 75 g: Unsaturated 80 g: Saturated 100 g: Supersaturated 81 g: Supersaturated
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select the correct answer. which sentence describes an example of subli…
C. Dry ice changes to carbon dioxide gas when kept in an open container.
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complete the following table to confirm correct lewis dot structure for…
| Formula | Name | Skeleton | # of valence e⁻ | e⁻ used in single bonds | Remaining electrons | Complete Lewis structure | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | CH₄…
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select the correct answer from each drop - down menu. andy has two samp…
Sample A is acidic, and sample B is acidic.
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solution (so), suspension (p), or colloid (c)? it settles suspension. d…
1. 1 - F, 2 - D, 3 - C, 4 - E, 5 - B, 6 - G, 7 - A 2. Unsaturated, Supersaturated, Unsaturated, Saturated, Supersaturated, Supersaturated 3. 46% solution, Supersaturated solution,…
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how does the authors use of free verse allow him to effectively express…
The use of free verse allows him to use unconventional rhythm.
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soluble or insoluble in water: cooking oil insoluble sugar soluble soap…
Solubility: Cooking oil - Insoluble, Sugar - Soluble, Soap - Insoluble, Dirt - Insoluble, Salt - Soluble, Ionic compounds - Soluble Solute - Solvent: Salt water: Salt (solute), Wa…
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multiple choice 1 point which of the following correctly describes the …
4. Protons are in the nucleus, and electrons orbit the nucleus 5. Electrons are shared equally between atoms
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24. write the name of the scientist beside the discovery or model name.…
a. Niels Bohr b. Ernest Rutherford c. J. J. Thomson d. James Chadwick e. John Dalton f. John Dalton g. J. J. Thomson h. Ernest Rutherford i. John Dalton
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read this excerpt from walt whitmans poem \i hear america singing\. i h…
present a poem with a natural, conversational rhythm.
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4. the inner layer of the earth is referred to as the (2 puntos) mantle…
4. D. inner core 5. C. water, dissolved gasses, and molten materials 6. A. transverse
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4. write the symbols for the isotopes of uranium with the following num…
a. \(_{92}^{234}U\) b. \(_{92}^{235}U\) c. \(_{92}^{238}U\)
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select the correct answer. sodium (na) and potassium (k) are in the sam…
B. 1
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type the correct answer in each box. the mass number of iodine is 126, …
53, 73
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select the correct answer. mercury is in the 80th position in the perio…
C. 80
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select the correct answer. mr. adams asked his students to write the ch…
B. Zn
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2. what does the number next to isotopes signify (ie: carbon 12 vs. car…
The mass number, which is the sum of protons and neutrons in the nucleus of the atom.
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drag the correct words to complete the sentence. the tempo scheme of th…
slow, fast
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how does the inorganic portion of soil form? soils get formed by meltin…
Rocks get weathered by chemical and physical means to form soils.
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question 13 2 pts a ______ fire extinguisher would be used for a fuel -…
Question 13: D. Both Carbon Dioxide and Multipurpose Dry Chemical Question 14: Safety signs
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which of the following is a property of pigments that causes separation…
solubility
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which of the following eye protection devices provides the best protect…
Clear safety goggles
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the atomic radius of a cesium atom is 0.000298 micrometers. round this …
\(3\times 10^{-4}\)
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read the passage from chapter 5 of animal farm. at the meetings snowbal…
D. Both Snowball and Napoleon are persuasive leaders and clever animals.
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short answer. explain the rules used when naming the following types of…
1. For simple ionic (binary) compounds like NaCl, the metal (sodium) is named first as sodium, and the non - metal (chlorine) is named as chloride, resulting in sodium chloride. 2…
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10. a scientist alters the concentration and surface area of a chemical…
c. increase the rate of reaction
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9. the error made on compound iv is that: a. a roman numeral should be …
a. A roman numeral should be used to represent Magnesium's charge is the error made on compound IV.
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use the following information to answer the next two questions. a stude…
c. III
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7. select the row that correctly finishes the following statement: \mol…
B. non - metals, non - metal, metal
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4. the correct name for n2o3 a. nitrous oxide b. nitrogen pentoxide c. …
5. C. lose, gain
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3. which of the following bonds would be best categorized as covalent? …
d. I and III
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1. magnesium nitride is a compound made up of a. 2 elements and 5 atoms…
A. 1:3 for AlBr₃ and 1:2 for MgCl₂
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4. the atomic radius of a cesium atom is 0.000 298 micrometers. round t…
$2.9800\times 10^{-4}$
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what ion is formed when an atom of mercury (hg) loses two electrons? hg…
Hg$^{+2}$
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recall it! select the statement that describes what would happen if the…
Since they are both negative they would push each other away.
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what ion is formed when an atom of mercury (hg) loses two hg⁻¹ hg⁻² hg⁺…
Hg$^{+2}$
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short or long response as instructed: 1. explain why the color of ocean…
1. Ocean water is generally blue due to Rayleigh scattering of short-wavelength blue light by water molecules. Varying colors are caused by suspended particles, algae, dissolved s…
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writing electron configuration & orbital diagram 1. write the long - fo…
1. - i. $1s^{2}2s^{1}$ - ii. $1s^{2}2s^{2}2p^{6}3s^{2}$ - iii. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$ - iv. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{8}$ - v. $1s^{2}2s^{2}2p^{6}3s…
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practice it! select the statement(s) that support water being the unive…
Water dissolves more substances than any other liquid. Water can dissolve other polar substances. Water dissolves substances by making hydrogen bonds with the polar ends of other …
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practice it! select the statement that describes what would happen if t…
Since they are both negative they would push each other away.
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describing isotopes what is the mass number of the isotope lithium - 7?…
7 5
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which of the following statements is true of organic foods? multiple ch…
They cost about 40 percent more than conventionally grown foods.
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question 41 (2 points) what is the clinical term for collapsed lung tis…
Question 41: D. Atelectasis Question 42: C. Ruptured plaque exposing thrombogenic material and clot formation
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read these lines: while phoebus with his towel must exhibit the streami…
B. abbca
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question 6 of 10 read these lines: as for her battles (should you wish …
A. abacc
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which sentence is punctuated correctly? 1. when dinosaur bones become p…
2. Most gems are minerals that occur in different types of rock; however, some gems are organic, meaning that they are produced by plants or animals.
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read these lines from \the monks tale\. he had a son, belshazzar was hi…
C. abac
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question 6 of 10 read this poem. roses are red, violets are blue, dodoe…
B. abab
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5. at room temperature, most of the elements in the periodic table are …
5. A. solids 6. A. Group 7A, Period 4 7. C. alkali metals, alkaline earth metals, halogens, noble gases 8. A. carbon, C, and silicon, Si 9. B. cesium, Cs 10. D. Cu(NO₃)₂ (aq)
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1. ____ cacl₂ is an example of a. a phase b. an element c. a metal d. a…
1. D. a compound 2. D. A liquid is heated on a Bunsen burner and its temperature rises. 3. C. They are now in the light blue liquid as copper compounds that contain copper atoms. …
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when wood burns in a fire, ash is left behind. which indication of chan…
The production of a solid residue.
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question 1 of 10 which sentence describes a characteristic of a poetry …
D. Audiences often express themselves vocally
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19. c + o₂ → co₂ 20. s + o₂ → so₂ 21. na₂co₃ + hcl → nacl + h₂o + co₂ 2…
19. $C + O_2=CO_2$ 20. $S + O_2=SO_2$ 21. $Na_2CO_3+2HCl = 2NaCl + H_2O+CO_2$ 22. $Zn + 2HCl=ZnCl_2 + H_2$ 23. $4FeS + 7O_2=2Fe_2O_3+4SO_2$ 24. $2C_4H_{10}+13O_2 = 8CO_2 + 10H_2O$
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question 2 dok 2 3 points paragraph 1 says, \in the living room the voi…
C. personification
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this is a graph for a different reaction. here, the amount of product i…
4 mg/s
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use the video about the law of conservation of mass on the previous sli…
1. The Law of Conservation of Mass states that in a closed - system chemical reaction, mass is conserved as atoms are only rearranged, not created or destroyed. 2. Without video d…
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which substance has the weakest attractive forces based on the provided…
$C_4H_{10}$
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carbon and sulfur are solid elements at room temperature. being in the …
strong
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nitrogen and oxygen are both gases at room temperature. being in the ga…
weak or low
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what is the unit of measurement for ionization energy as shown in the g…
B. Kilojoules per mole
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bj printer characteristics use the information below to answer the ques…
Prints do not require heat
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why is nitrogen above phosphorus on the periodic table? it has fewer el…
It has fewer electrons
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electronegativity values are calculated in relation to which elements v…
D. Hydrogen
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6/17 choose the element with the highest ionization energy.
Helium
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bj: printer characteristics use the information below to answer the que…
Prints are not that strong.
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select the correct answer from each drop - down menu. plants use sunlig…
The radiant energy of the Sun is converted into chemical energy by the plants.
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why do noble gases have high ionization energies? they have low atomic …
They have a full outer shell of electrons
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which of the following statements is true? a. individual atoms can be s…
D. The nucleus of an atom contains protons and neutrons.
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the periodic table displays a. only the important elements that exist i…
B. all of the known elements that exist in the world today.
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which of the following is an element? a. zinc metal (zn) b. carbon mono…
A. zinc metal (Zn)
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what is the smallest part of an element that still retains properties o…
C. atom