化学
化学反应、化学计量、分子结构与元素性质。
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the carbon cycle, the system cycling of carbon within and between earth…
movement, biosphere
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9.what are some properties/characteristics of copper? 10. a)what is the…
9. Good conductor of heat and electricity, high ductility and malleability, reddish - brown color. 10. a) Bronze, copper and tin. b) Used for tools, weapons, artworks, improved pr…
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question 16 match these chemistry terminology words: column a 1. atom 2…
1. Atom - d. Smallest unit of matter 2. Molecule - a. group of atoms linked together 3. Element - b. Purest substance made of one kind of atoms (periodic table) 4. Matter - c. any…
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question 15 (1 point) cation a atom gains electron and becomes positive…
c. átomo lose electron and becomes positively charged ion
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the diameter of a hydrogen atom is about 0.000000005 centimeters. what …
A. $5\times10^{-9}$ cm
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periodic trends review multiple choice 1. which statement best describe…
1. B 2. C 3. C 4. C 5. A 6. B 7. C 8. C 9. B 10. D 11. A 12. A 13. B 14. A 15. C 16. D 17. D 18. A 19. A 20. A 21. C 22. D
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reviewing key terms choose the letter of the best answer. 1. energy of …
1. A. kinetic energy 2. B. elastic potential energy 3. C. mechanical energy 4. D. nuclear energy 5. A. chemical energy 6. False, Gravitational potential energy 7. False, Thermal e…
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age of science 1747 andreas marggraf discovers that beet sugar is ident…
It documents key events in the sugar and sweetener industries.
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question 21 of 28 which kind of erosion results in sand dunes? a. strea…
D. Wind
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multiple - choice question are any zeros in - between 2 non - zeros sig…
Any zeros in - between 2 non - zeros ARE sig figs.
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question 20 of 28 which type of rock forms when liquid rock cools and h…
A. Igneous rock
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question 13 of 28 which process is caused by some combination of wind, …
D. Erosion
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give the full ground state electron configuration for tungsten.
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{4}$
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give the full ground state electron configuration for yttrium.
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{1}$
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give the full ground state electron configuration for tin.
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁶5s²4d¹⁰5p²
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give the full ground state electron configuration for gallium.
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{1}$
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give the full ground state electron configuration for barium. possible …
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}$
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pregunta 11 (1 pto) las sustancias químicas asociadas a los seres vivos…
# Breve explicación: Los compuestos orgánicos son aquellos que contienen carbono y están asociados a los seres vivos. # Respuesta: a. Compuestos orgánicos
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give the full ground state electron configuration for potassium.
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}$
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question 6 of 25 during which type of change can an atom of uranium bec…
C. Nuclear
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during which type of change can an atom of uranium become an atom of pl…
C. Nuclear
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pregunta 8 (1 punto) los átomos están unidos entre sí en moléculas medi…
# Breve Explicación: Los átomos en una molécula están unidos por enlaces químicos, que son interacciones entre los electrones de los átomos. # Respuesta: Verdadero
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which atomic particles are nucleons? a. only electrons b. electrons and…
C. Neutrons and protons
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pregunta 7 (1 punto) ¿qué es el ph de un ácido? a 3 b 11 c 7 d 8
# Explicación: ## Paso 1: Recordar la escala de pH La escala de pH va de 0 a 14. Los valores menores a 7 indican soluciones ácidas. ## Paso 2: Identificar el valor ácido Entre los…
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the periodic table entry for beryllium (be) is shown below. beryllium h…
D. $^{9}_{4}\text{Be}$
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an atom of the element fluorine can be represented by the bohr model sh…
B. 10
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hunting the elements 1. what do the two - letter words/symbols represen…
1. Chemical symbols for elements. 2. a) Au b) Protons, neutrons, electrons c) Dense, soft, yellow - colored, good conductor, corrosion - resistant. 3. Panning, sluicing, X - ray f…
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the lewis dot diagram for an unidentified element is shown below. which…
B. chlorine
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3.4.2 quiz: scientific models this mathematical model describes the cha…
B. The molecules will begin moving more slowly.
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question 6 of 10 based on the model you saw in the study, predict what …
A. The molecules will move more quickly.
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question 5 of 10 what does the model below represent? 2co + o₂ → 2co₂ a…
C. A chemical reaction
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the electron dot diagrams of calcium and magnesium are shown. both elem…
C. Both elements are in the same group on the periodic table.
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question 4 of 10 what does the object on the screen below model? a. the…
C. Molecules
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the element krypton is a gas that shows almost no chemical activity. to…
an element in the same group
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copper wires carry electricity into our homes because copper atoms lose…
A. Copper is used in electrical wiring instead of oxygen or sulfur because copper is a metal, loses electrons easily, is on the left - center of the periodic table, and allows ele…
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question 2 of 10 what kind of model is shown below? a. mathematical mod…
B. Physical model
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which element is most likely to form an ion with a negative 2 charge? o…
Oxygen
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pregunta 2. relacione los términos de la química con la mejor respuesta…
1. a. Enlace iónico 2. b. Enlace químico 3. c. Enlace covalente
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based on its position in the periodic table of the elements, how many v…
B. 5
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if an ion has three more electrons than protons, it has a ○ mass of +3.…
Charge of -3.
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the electrical charge of the nucleus of an atom is +12. how many electr…
B. 12
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activity 15 - bonding vs nonbonding while h - h is selected in the \com…
# Explicación paso a paso: ## Paso 1: Comprender los átomos de hidrógeno y helio El átomo de hidrógeno tiene 1 electrón en su orbital 1s. El átomo de helio tiene 2 electrones en s…
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what happens when an atom gains an electron? the atom loses a proton. t…
The atom becomes negatively charged.
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pregunta 2 ( relacione los fundamentos de la química con la mejor respu…
1. a. Enlace iónico 2. b. Enlace químico 3. c. Enlace covalente
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show instructions question 1 (0 points) explain what happens when amino…
- **Pregunta 1**: Los aminoácidos se enlazan a través de enlaces peptídicos, que son un tipo de enlace covalente. Este enlace se forma mediante una reacción de condensación entre …
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nonmetals form covalent bonds (shared electron pairs) with other atoms.…
C. the number of additional electrons the nonmetal needs to fill its valence shell
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¡proyecto de elemento en carte! objetivo: haz un póster sobre un elemen…
# Explicación: ## Paso 1: Identificar información básica del cobalto - Nombre: Cobalto - Símbolo atómico: Co - Número atómico: 27 (ya que es la identificación única del elemento e…
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complete the statement. in general, nonmetals in the same ______ form t…
B. group
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select the correct values in the table. type of covalent bond how many …
| Type of covalent bond | How many shared electron pairs in the bond? | How many electrons in the bond? | | ---- | ---- | ---- | | single bond | 1 | 2 | | double bond | 2 | 4 | | …
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complete the statement. covalent bonds form between ______. choose 1 an…
A. two nonmetals
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group 2 metals can bond with group 17 nonmetals to form ionic compounds…
2
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polyethylene is composed of long chains of carbon and hydrogen atoms bo…
C. covalent
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density polyethylene (hdpe) and low - density polyethylene (ldpe). recy…
van der Waals
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list two things you know about atoms. 1. 2.
1. Los átomos son partículas elementales. 2. Contienen protones, neutrones y electrones.
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you might need: calculator, periodic table hypobromite is a polyatomic …
43 protons 44 electrons
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the lewis diagram for a neutral strontium atom is shown below. sr compl…
lose; 2
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chemical substances were originally named based on their properties, di…
From left - to - right: $SrSO_{4}$, $K_{2}SO_{4}$, $CaSO_{4}$
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a student received a in english composition (3 credits), a c in chemist…
2.87
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move the cards to match the name with the correct chemical formula. che…
$NH_4OH$ - ammonium hydroxide $AlN$ - aluminum nitride $Al(NO_3)_3$ - aluminum nitrate $NH_4NO_2$ - ammonium nitrite $Al(OH)_3$ - aluminum hydroxide $NH_4NO_3$ - ammonium nitrate
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a common chemical reaction involves two ionic compounds that exchange i…
For reactants: A. $K_2SO_4 + Ba(NO_3)_2$ For products: B. $BaSO_4 + KNO_3$
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fill in the table by selecting the correct iupac name for each formula.…
| Chemical formula | Name | | ---- | ---- | | RbCl | Rubidium chloride | | BeS | Beryllium sulfide | | Ba(C₂H₃O₂)₂ | Barium acetate | | CsClO₃ | Cesium chlorate |
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originally, chemical substances were named based on their origins or pr…
Quicklime: $CaO$ Limestone: $CaCO_{3}$ Fluorite: $CaF_{2}$
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this model represents an element in the periodic table. which element d…
C. Li, 6.94, Lithium
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sodium bicarbonate is commonly known as baking soda. its added to many …
A. $NaHCO_3$
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garnets are a class of minerals which exist in many colors. theyre ofte…
$Ca^{2 + }$ and $SiO_{4}^{4 - }$: Ionic $Al^{3 + }$ and $SiO_{4}^{4 - }$: Ionic $Si$ and $O$: Covalent
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based on this information, which two formulas below represent neutral c…
B. $Li_2SO_3$, C. $CaSO_3$
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hypochlorite is a polyatomic ion with formula clo⁻. it is used to disin…
25 26
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which formula accurately represents a neutral ionic compound? choose 1 …
A. MgO
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which formula accurately represents a neutral ionic compound? choose 1 …
A. BeS
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metals in group 1 of the periodic table can form ionic bonds with eleme…
B. group 17
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group 1 metals can bond with group 17 nonmetals to form ionic compounds…
1
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barium fluoride is an ionic compound. it produces light when x - rays o…
None of the given options are correct. The correct Lewis structure of barium fluoride should be $[Ba]^{2 + }2[ :F:]^-$ (but this is not among the provided choices). If we assume t…
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which of these elements forms ions with the same charge as radium ion? …
B. calcium
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group 2 elements are called alkaline earth metals. when exposed to air,…
lose; 2; + 2
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the lewis diagram for a neutral aluminum atom is shown below. ·āl compl…
lose 3
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a chemist is heating water so it can dissolve a larger amount of sodium…
$y = 7x+21$
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9. what is the schematic symbol shown below? a. laser b. triac c. photo…
D. photo - SCR
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thermal energy is applied to a gas. what will happen to the gas molecul…
A. The movement, kinetic energy, and pressure of the molecules will increase.
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chem a, unit 2 test 1. email * 2. which atom among cl, al, cs, and li h…
2. A. Cl 3. A. False 4. A. Arsenic
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multiple choice 2 points according to the rock cycle, ____ rocks form w…
31. A. sedimentary 32. B. the inner core, the outer core, the mantle, and the crust 33. D. wide continental shelf
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5. which of the following elements is an alkali metal? mark only one ov…
5. D. Na 6. A. Mg 7. A. Ar 8. D. F
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9. the region of space with the highest probability of finding an elect…
9. orbital 10. increases 11. have the same number of valence electrons 12. 1
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which drug contains the chemical thc and affects specific receptors in …
C. marijuana
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a model of a potassium bromide (kbr) lattice is shown below. a model of…
B. ionic (assuming there is an ionic option not shown in the provided part of the question as the correct answer is ionic and not covalent)
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barium sulfate (baso4) is composed of barium and sulfate (so42−) bonded…
Ionic
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aluminum (al) is lightweight and malleable. it is commonly used to make…
C. metallic
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groups 3 - 12 24. list the number of valence electrons for each of the …
Group 1: 1 Group 2: 2 Group 13: 3 Group 14: 4 Group 15: 5 Group 16: 6 Group 17: 7 Group 18: 8
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pete is composed of long chains of carbon, hydrogen, and oxygen atoms b…
B. covalent
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question 5 (1 point) which of the following descriptions correctly desc…
C. The process where sediment and other materials are moved from one place to another.
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9. arrange the following elements in order of increasing ionization ene…
a. Sr < Mg < Be b. Cs < Ba < Bi c. Na < Al < S
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two liquids are mixed. the mixture heats up, and a gas is produced whic…
There is evidence of a chemical change because new substances (the gas) are formed and there is an energy change (heating up).
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6. in point form, describe dalton’s atomic model. (2)
- Atoms are indivisible and indestructible. - Different elements have atoms of different masses. - Chemical reactions are rearrangements of atoms.
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element symbol atomic # mass # # of protons # of neutrons # of electron…
| Element | Symbol | Atomic # | Mass # | # of Protons | # of Neutrons | # of Electrons | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | | Hydrogen | H | 1 | 1 | 1 | 0 | 1 | | …
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17. which element would have the largest atomic radius? mark only one o…
Rb 18.
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what building was the subject of boss tweeds biggest graft scheme? poli…
C. court house
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21. which element has a full valence shell and is therefore unlikely to…
B. Neon (Ne) ### 22.
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25. an aluminum ion (al³⁺) contains: mark only one oval. 13 protons, 13…
25. 13 protons, 10 electrons, 14 neutrons 27. Fission 28. Sodium has one valence electron it can easily lose 26. Atoms with the same number of protons but different numbers of neu…
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31. which statement best describes why isotopes of carbon (c - 12 and c…
- **Question 29**: C. Fluorine (F) - **Question 30**: B. Rutherford: The gold foil experiment - **Question 31**: D. They have different numbers of neutrons - **Question 32**: D. T…
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which change is likely to happen to an atom of the element strontium (s…
It will give up electrons, forming a positive ion.
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which evidence is an indication that a chemical reaction has occurred? …
Formation of a precipitate