Chemie
Chemische Reaktionen, Stöchiometrie, Molekülstrukturen und Elementeigenschaften.
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how many moles of ch4 are in 64.2 g ch4? 64.2 g ch4 1 mol ch4 16.05 g c…
$4.00$ moles $\ce{CH4}$
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how many moles of ch4 are in 64.2 g ch4? lets begin by setting up our e…
B
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what is the molar mass of ch4? (c = 12.01 g/mol, h = 1.01 g/mol) a. 1 g…
D. \(16.05\ g/mol\)
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determine the number of 3s electrons in mg. express your answer as an i…
For Mg: 2 For Cr: 5
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which compound forms a powerful acid and also contains h₂s hbr li2o libr
B. \(HBr\)
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what is an atom that gains a charge/ gains or loses an electron. isotop…
Ions
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krypton is named after the greek word that means \secret.\ which e give…
Krypton is a noble gas, so it was difficult for chemists to find it, as this explains the "secret" - like nature (difficulty in discovery) associated with its naming.
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when a sodium atom gives an electron to the chlorine what happens to th…
First option (The charges of the atoms change. The Chlorine atom into a negative charge, and Sodium atom into a positive charge).
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the diagrams to the right show the distribution and arrangement of gas …
- If the temperatures of both containers are equal, container A has greater pressure than container B. - If the pressure in both containers is equal, container A has a lower tempe…
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which of the following is true? the chlorine (cl) atom becomes negative…
The chlorine (Cl) atom becomes negatively charged and the sodium atom (Na) becomes positively charged.
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sodium chloride is held together by an ionic bond of a metal and a nonm…
Na (Sodium)
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so heres an easy question. an ionic bond is on type of chemical bond. w…
A metal and a non - metal atom.
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multiple - choice question what do bonds basically do to atoms? connect…
Connect or 'glue' them together.
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which scenarios contradict ideal gas characteristics, representing devi…
B. a gas at very low volumes, when gas particles are very close together; C. a gas at very low temperatures, when gas particles have very little kinetic energy; E. a gas with high…
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how many types of chemical bonds are there? 3 2 1 rewatch submit
3
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find the relative clause. if it is nonrestrictive, set it off with comm…
When adding organic materials to a compost pile, gardeners should avoid animal products and fats in favor of scraps from plants that have not been treated with pesticides.
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a chemist, is running tests with four unknown ments. he has found that …
17.
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a student is working with four different solid substances: sodium (na),…
iodine
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when looking across the periodic table from left to right, which of the…
group 14
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which describes any compound that has at least one element from group 1…
halide
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part 3: multi-step conversions (grams ⇄ moles ⇄ particles) problem show…
For the first problem: \(92.14\text{ g}\) For the second problem: \(1.024\times 10^{24}\text{ atoms}\)
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ccc structure and function why is the arrangement of the constituent at…
The arrangement of constituent atoms/molecules is more important in solids as they are closely packed with fixed positions (unlike liquids/gases). Solids' structures are described…
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sep construct an explanation explain why carbon dioxide is a gas, water…
Carbon dioxide has weak intermolecular forces (London dispersion forces), so particles move freely (gas). Water has hydrogen bonding (stronger than in \(CO_2\) but not rigid), so …
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section 5.1 what are elements?, continued in your textbook, read about …
14. a. 2 15. d. 32 16. d. isotopes 17. c. number of electrons in the outermost energy level 18. c. 18 19. a. unlikely to combine chemically with other elements 20. protons (assumi…
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how does chemical weathering occur? plants, lichens, and mosses acceler…
by chemically breaking down rocks by water and gases
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what does humus contribute to soil? it prevents water from entering the…
It enriches organic matter.
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fill in the blank: when the prefixmono creates a double vowel with the …
o
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tree roots can break down rock into soil. which type of weathering is t…
Physical
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section 3.1 what are elements? in your textbook, read about elements an…
1. element 2. atom 3. nucleus 4. protons 5. neutrons 6. electrons 7. atomic number 8. isotopes 9. radioactivity 10. orbital 11. valence electrons 12. mass number 13. atomic mass
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form of therapy that combines behavioral and cognitive treatment techni…
cognitive behavioral therapy (CBT)
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16. in _, materials are physically or chemically changed to produce a p…
16. A. process manufacturing 17. D. Form 18. B. continuous process 19. D. CAD 20. B. produce goods and services with less of everything that goes into the process 21. C. just - in…
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3. what aspect of a chemical reaction may be defined as a change in con…
Rate of a chemical reaction.
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what element is described by the illustration? sodium (na) oxygen (o) a…
Chlorine (Cl)
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write the letter of the correct answer on the line at left. 5. while ma…
D. Some water evaporated and concentrated the salt.
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4. kate was drinking grape juice one morning at breakfast. she had been…
| Solution | Solvent | Solute | |--|--|--| | a homogeneous mixture in which a substance is dissolved in a liquid, grape juice | the liquid in which a substance is dissolved, water…
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understanding main ideas 1. explain why water is a polar molecule. 2. h…
1. Water is polar due to bent shape and electronegativity difference (\(O\) pulls electrons, creating \(\delta-\) on \(O\) and \(\delta+\) on \(H\)). 2. Covalent bond (strong, ele…
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waysiders by seumus okelly 1 that day the building was begun. martin co…
In his dreams in the night he would reach out his hands for the feel of the hard stone, a burning desire in his breast to put it into shape, to give it nobility in the scheme of a…
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the group number of an element on the periodic table corresponds to the…
A. True
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3. jose had an assignment to classify mixtures he found around his home…
A. colloid
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2. having studied mixtures at school, daniel wanted to investigate how …
B. Use a magnet to separate the metal parts, C. Use a hotplate to evaporate the liquid, D. Use a filter to separate large particles.
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write the letters of the correct answers on the lines at left. 1. ian h…
A. heterogeneous
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how many protons are in the illustrated element? li 1 2 3 4
3
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kudzu scientists try to tame a self-replicating monster 1. since the 19…
Native predators did not exist to control it.
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5 what role did haudenosaunee women play in their government? a they we…
B. They chose and could remove sachems
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what should be used to neutralize battery acid spills before cleaning t…
Baking Soda
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1. what did miller and urey include in their experiment to simulate the…
electric charge
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14. sulfur is not ductile, and not malleable. is sulfur a metal, nonmet…
14. C. Nonmetal 15. D. All of the above 16. B. It is a metalloid 17. C. Nonmetal 18. C. Mercury Written response: The group is metalloids. Their elements tend to have properties i…
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5. carbon and other nonmetals are found in which area of the periodic t…
5. B. On the right side 6. A. Become less metallic. 7. D. Metalloids 8. A. Metals. 9. A. Brittle. 10. C. Silicon 11. C. Good conductors of heat. 12. D. Nonmetals. 13. A. Solid at …
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a student does not observe a change when holding a test tube in a flame…
The Bunsen burner was not properly adjusted.
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non - metals non - metals are poor conductors of heat and electricity. …
1. A. Transition elements 2. C. Liquid at room temperature 3. A. Varying ability to conduct electric current 4. D. Metalloids
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the elements in which group in the periodic table release the most ener…
VIIA
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enter the numbers 1 to 5 to put in order the steps for lighting a bunse…
4. Use a strike lighter to light the flame. 2. Turn on the gas supply to the Bunsen burner. 1. Clear the area of anything flammable, such as liquids, hair, etc. 5. Adjust the air …
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which atom/ion is the smallest? a) se²- b) br- c) rb+ d) y³+ e) mo⁶+
E. \(Mo^{6+}\)
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solve the following mole related problems a) how many moles of rubidium…
Approximately $0.277$ moles.
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select the correct answer. which of the following is a medicine that st…
C. antitoxin
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what should be used to clean battery acid from you clothes or skin? bra…
D. Baking Soda
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question 1 (2 points) how many electron groups are around the central a…
5
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question 4 (2 points) which of following structures is the best lewis s…
2
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question 3 (2 points) what is the formal charge on atom 1 for the follo…
+1
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solid to liquid * freezing melting boiling sublimation this is a requir…
For "Solid to Liquid": Melting. For "The change of state from a liquid to a gas": Evaporation.
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question 2 (2 points) what is the valence electron count for the formul…
32 electrons
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question 1 (2 points) which compound is likely to have an incomplete oc…
\(BH_3\)
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what is the sum of the neutrons plus protons equal to? mass number atom…
- First question: Mass number - Second question: Bony callus
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bohr diagram lewis structure o
\(P = 8\), \(N = 8\), \(E = 8\)
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bohr diagram lewis structure be
\(P = 4\), \(N = 5\), \(E = 4\)
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what is a region in an atom where there is a high probability electrons…
First question: Outer Shell of the atom(inside of the electron) Second question: Valence Electrons
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which is a tiny negatively charged subatomic particle movir outside the…
First question: Electron Second question: Energy Levels
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3. the reactant that runs out first and stops the reaction is called th…
limiting reactant: \(H_{2}\) excess reactant: \(N_{2}\)
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excerpt from tools of the spymaster which statement best expresses the …
James Jay’s system required two chemicals for writing and reading invisible ink messages.
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what is the center of an atom; made up of protons and neutrons?*solidnu…
- First question: Nucleus - Second question: Proton - Third question: Neutron
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what is the center of an atom; made up of protons and solid nucleus ene…
1. The center of an atom made up of protons (and neutrons) is the **Nucleus**. 2. A positively - charged subatomic particle in the nucleus is the **Proton** (the selected option "…
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in which form of matter do particles move most freely? solid liquid gas
gas
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3. complete the table below for the reaction of methane: 4. what is alw…
4. Simplified ratio: \(1:2:1:2\). For every \(1\) mole of \(CH_{4}\) used, \(2\) times \(O_{2}\), \(1\) time \(CO_{2}\), \(2\) times \(H_{2}O\). 5. a. \(9CH_{4}\times2 = 18O_{2}\)…
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which of these has the least heat? gaseous form of co2 solid form of co2
solid form of CO2
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which of these has the least particle motion? a gas a solid
a solid
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are the particles in all substances always in motion (kinetic theory mo…
yes
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10. base your answer(s) to the following question(s) on the information…
Decomposition reaction.
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20. which best describes a covalent bond? (a) complete even sharing of …
- Question 20: C. sharing of electrons between two atoms - Question 21: B. a homogeneous mixture of two or more substances - Question 22: C. 8 - Question 23: C. the number of prot…
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question 3. which of the following correctly represents the electron - …
The first option (the one with 4 dots around C, two on top, two at the bottom) is correct.
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question 2. drag the correct number of valence electrons to each repres…
Lithium: 1, Sulfur: 6, Barium: 2, Chlorine: 7
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pregunta 4. completa la siguiente tabla arrastrando el número correcto …
# Explicación breve: Para determinar el número de electrones de valencia y la estructura de puntos de electrones (diagrama de Lewis) de un elemento, se utiliza la configuración el…
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exit ticket 22 (module 4 - lesson 8) question 1. which of the following…
Nitrogen (N), Phosphorus (P)
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pregunta 3. ¿cuál de las siguientes opciones representa correctamente l…
# Explicación breve: El carbono (C) tiene 4 electrones de valencia. En la representación de Lewis, se muestran estos electrones como puntos alrededor del símbolo del átomo. La est…
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pregunta 2. anastra el número correcto de electrones de valencia a cada…
# Explicación: ## Paso 1: Determinar la configuración electrónica de Litio (Lithium) El Litio (Li) tiene un número atómico de 3. Su configuración electrónica es \(1s^{2}2s^{1}\). …
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pregunta 1. ¿cuál de los siguientes elementos tiene 5 electrones de val…
# Explicación breve: Para determinar el número de electrones de valencia de un elemento, se puede utilizar la ubicación del elemento en la tabla periódica. Los elementos de la fam…
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read the excerpt from \tools of the spymaster.\ james jays invisible in…
James Jay's invisible ink system allowed Washington to read secret messages.
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8. for each of the following elements, circle the element with the high…
a) Circle \(\text{Ne}\), Square \(\text{Be}\) b) Circle \(\text{He}\), Square \(\text{Cs}\) c) Circle \(\text{C}\), Square \(\text{Pb}\) d) Circle \(\text{S}\), Square \(\text{Sr}…
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7. for each of the following elements, circle the element with the larg…
a) \(\textcircled{Be}\), \(\boxed{O}\) b) \(\textcircled{Cs}\), \(\boxed{He}\) c) \(\textcircled{Pb}\), \(\boxed{C}\) d) \(\textcircled{W}\), \(\boxed{S}\)
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6. which particle has the larger radius in each atom - ion pair? a) na …
a) \(Na\); b) \(S^{2 - }\); c) \(I^{-}\); d) \(Al\)
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5. which element in each pair has the larger ionization energy? circle …
a) O, b) Be, c) Ne, d) Zn, e) Ne, f) V, g) Ca, h) Se
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4. which atom in each pair has the larger atomic radius? circle the cor…
a) K; b) Ca; c) Ga; d) Br; e) C; f) Be; g) Si; h) Au
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3. indicate whether the following properties increase or decrease from …
a) Decrease b) Increase c) Increase
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each element is displayed in a box on the periodic table. the informati…
1. \(12\) 2. \(11\)
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periodic trends worksheet use the periodic table and your knowledge of …
Oxygen < Carbon < Aluminum < Potassium
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7. base your answer(s) to the following question(s) on the information …
\(285\space g/mol\)
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atomic structure are the smallest unit of an element. are composed of t…
1. The nucleus 2. 2 3. 2 4. Electrons
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4. base your answer(s) to the following question(s) on the diagram belo…
One possible answer is \(2,8,1,1\) (where one electron is promoted from the third shell to the fourth shell). Another could be \(2,7,3\) (if one electron is promoted from the seco…
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given the simple representations for atoms of two elements: ○ = an atom…
D.
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8. base your answer(s) to the following question(s) on the information …
Element D
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the particle diagrams below represent the reaction between two nonmetal…
Covalent bond