化学
化学反応、化学量論、分子構造、元素の性質。
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b. describe the symmetries of the water molecule. select the correct ch…
C. The water molecule has 2 line(s) of symmetry, no point symmetry, and the following rotational symmetry(ies) 0,180
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describe the symmetries of each molecule shown. a. benzene b. water c. …
C. The benzene molecule has 6 line(s) of symmetry, point symmetry, and the following rotational symmetry(ies) 60,120,180,240,300,360
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c. describe the symmetries of the hydrogen peroxide molecule. select th…
A. 180
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describe the symmetries of each molecule shown. a. benzene b. water c. …
a. A. The benzene molecule has 6 line(s) of symmetry, point symmetry, and the following rotational symmetry(ies) 60,120,180,240,300. b. B. The water molecule has 2 line(s) of symm…
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describe the symmetries of each molecule shown. a. benzene b. water c. …
A. The benzene molecule has 6 line(s) of symmetry, point symmetry, and the following rotational symmetry(ies) 60,120,180,240,300,360
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is pen ink a heterogeneous mixture or a solution? explain
La tinta de bolígrafo es una solución.
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4 — the decision - making process learning objective: apply the decisio…
d. a schema
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periodic table of elements what is the molecular formula for sulfur dio…
$SO_2$
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13 multiple choice 1 point put the following in order from smallest to …
C. F, Se, K
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12 multiple choice 1 point the phenomenon in which full inner electron …
B. shielding effect
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15. the basis for ordering elements in the modern periodic table is inc…
atomic number, which reflects the number of protons for each element.
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according to vsepr theory, what is the shape of the molecule boron trif…
Trigonal planar
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1 why does the element sodium (na) readily form compounds? select two c…
C. Losing one electron creates a stable electron arrangement. E. Sodium (Na) has just one valence electron which is easily lost.
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which element is the most reactive in period 2? nitrogen (n) oxygen (o)…
C. Fluorine (F)
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directions: drag and drop the correct answer choice to each answer blan…
Element A < Element D < Element B < Element C
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select the correct answer. what is the greatest difference between ben …
B. tone
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bohr model practice directions: use the periodic table to draw a bohr m…
| Atom | # of Protons | # of Neutrons | Energy Levels | # of Electrons | Valence electrons | | ---- | ---- | ---- | ---- | ---- | ---- | | Helium | 2 | 2 | 1 | 2 | 2 | | Boron | 5…
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10 multiple choice 1 point the group 5 element with the highest electro…
D. N
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chapter 4 review word bank: renaissance man treatise uomo universale ir…
(1) Uomo Universale (2) Irony (3) Renaissance Man (4) Rhyme scheme (5) Sonnet (6) Treatise (7) Italian political - philosopher (8) Political treatise by Machiavelli (9) Italian sc…
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11. going from left to right in the periodic table, the atomic radius d…
The attraction increases between the nucleus and the outer electrons.
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multiple choice 1 point how many valence electrons does carbon (c) have?
4
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10. copper has an isotope with an atomic mass of 62.93 and an abundance…
63.55
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9 the diagram below shows the lewis dot structure for different element…
3
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determine the name of each compound. use roman numerals where needed. s…
CuO: copper(II) oxide Cu₂O: copper(I) oxide CoS: cobalt(II) sulfide Co₂S₃: cobalt(III) sulfide FeBr₂: iron(II) bromide
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6. the illustration below shows atoms of three isotopes of potassium (k…
Each atom has the same number of protons, which defines the element, even though the number of neutrons varies.
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the atomic number of aluminum is 13. what is the correct designation of…
1s²2s²2p⁶3s²3p¹
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write the chemical formula for the compound formed by each pair of posi…
Ba(NO₃)₂ Al₂(CO₃)₃ K₃PO₄
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4. which of these statements, later proven incorrect, is one of the con…
Atoms are the smallest particles of matter and cannot be divided.
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there are four common oxoanions of iodine and two common oxoanions of n…
$IO_{4}^{-}$: periodate ion $IO_{3}^{-}$: iodate ion $IO_{2}^{-}$: iodite ion $IO^{-}$: hypoiodite ion $NO_{3}^{-}$: nitrate ion $NO_{2}^{-}$: nitrite ion
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name: nitrite ion formula: no²⁻ name: nitrate ion formula: no³⁻
The correct formula for nitrite ion is $NO_{2}^{-}$ and for nitrate ion is $NO_{3}^{-}$.
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2. how many electrons does an atom of group 2, period 3 have? clear all…
12
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2. a student reacts 1.005 g al with 50 ml of 4m naoh and an excess of h…
a. $453.35\ g/mol$ b. $16.89\ g$ c. $90.00\%$
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avogadros number is 6.02 x 10^23 of anything true false
False
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3 multiple choice 1 point how many valence electrons does aluminum (al)…
3
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question 1 of 10 what moles allow scientists to determine? (select all …
A. atoms B. molecules D. ions
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tobacco use tobacco use is the leading cause of death and disability th…
1. F; Tobacco use during adolescence is harmful even if the person quits before adulthood as it reduces the rate of lung growth, can cause shortness of breath, coughing spells, wh…
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arrange the set of bonds according to length. longest bond c≡c c=c c−c …
Longest bond: $C - C$ Middle - length bond: $C = C$ Shortest bond: $C\equiv C$
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2 multiple choice 1 pt how many valence electrons does chlorine (cl) ha…
7
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blood is a mixture of a variety of materials. some of the materials are…
C. a suspension
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select the correct text in the passage. in this excerpt from annus mira…
Methinks already from this chemic flame, I see a city of more precious mould; Rich as the town which gives the Indies name, With silver paved, and all divine with gold
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which of the following observations best demonstrates waters special pr…
C. Water forms droplets of dew on a spider web in the morning.
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units of measurement assessment 2025x about how many male chemistry tea…
35
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part two directions: each question below gives you a bit of information…
7. Ruthenium 8. Lutetium 9. Holmium 10. Nobelium 11. Meitnerium 12. Copernicium 13. Selenium 14. Tellurium 15. Zinc 16. Neodymium 17. Promethium 18. Dysprosium 19. Carbon
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1. physical and chemical processes that compact and transform sediments…
Lithification
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the diagram shows hydrogen bonds between water molecules. label the dia…
The hydrogen atoms (H) should be placed near the oxygen atoms (O) to show the hydrogen - bonding interaction. The hydrogen bond is an intermolecular force between the H of one wat…
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amanda and pol were in science lab, trying to identify a color - less l…
1. adhesion 2. cohesion 3. solvent 4. water 5. neutral 6. water
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2. provide the ph of most acid rain compared to the ph of normal rain w…
# Explicación: ## Paso 1: Definir pH de agua de lluvia normal El pH de la lluvia normal es aproximadamente 5,6 debido a la interacción con el dióxido de carbono en la atmósfera ($…
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goal: to demonstrate knowledge of ionic bonding 1. examine the bohr - r…
a. Its outer shell is not full (has 6 instead of 8 valence electrons). b. Gaining 2 electrons. Stable electron arrangement: Add 2 electrons to oxygen's outer shell with coloured p…
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3. use the following box to describe the cause and symptoms of differen…
1. **Fill - in - the blanks**: - hypothalamus - 80% - hydrated; nourished; physical condition - sweating; fluids; electrolytes; dehydration - drinking water; sports drinks - heat;…
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2. write the formula for the compound formed by each pair of elements. …
a. $CaS$ b. $MgI_{2}$ c. $AlCl_{3}$ d. $BaO$
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when you mix salt into a glass of water until it disappears, the salt s…
water
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¿por qué es importante la energía de activación en las reacciones quími…
Aporta la energía necesaria para empezar a romper enlaces químicos en los reactivos.
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when you mix sugar into a glass of lemon juice until it disappears, the…
lemon juice
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if a solid has a density of 5.0 g/cm³, what volume of the solid has a m…
1. A. $5\ cm^{3}$ 2. A. True
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¿qué afirmación explica mejor por qué algunas reacciones químicas no oc…
Aporta la energía necesaria para empezar a romper enlaces químicos en los reactivos.
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¿qué afirmación explica mejor por qué algunas reacciones químicas no oc…
Aporta la energía necesaria para empezar a romper enlaces químicos en los reactivos.
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in a solution, what is a solvent? a substance in which the solute disso…
A. A substance in which the solute dissolves.
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electron configuration exercise chemistry how to write an electron - co…
1. $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{1}$ 3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}$ 4. $1s^{2}2s^{2}2p^{6}3s^{2…
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in a solution, what is a solute? the substance that lowers boiling poin…
The substance that dissolves.
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¿por qué es importante la energía de activación en las reacciones quími…
# Breve Explicación: La energía de activación es la energía mínima requerida para que los reactivos puedan romper enlaces químicos y comenzar una reacción química. Sin esta energí…
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what is a solution? a mixture where one substance dissolves evenly into…
A. A mixture where one substance dissolves evenly into another.
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objetivo de aprendizaje 2: investigar cómo los cambios de energía afect…
Requieren más energía para iniciarse que la que liberan.
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binary ionic compounds goal: to name and write formulas for binary ioni…
a. lithium fluoride b. beryllium oxide c. sodium nitride d. magnesium chloride
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¿qué afirmación compara correctamente los reactivos y productos en una …
# Breve explicación: En una reacción química, los enlaces químicos de los reactivos se rompen y los átomos se reorganizan para formar nuevos enlaces en los productos. Esto implica…
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cuando ocurre una reacción química, ¿cuál de las siguientes opciones de…
# Breve explicación: En una reacción química, se necesita energía para romper los enlaces químicos de los reactivos, y cuando se forman nuevos enlaces en los productos, se libera …
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2. describe the bond polarity and molecular polarity for both ccl4 and …
The bond polarity in \(C - Cl\) is due to the electronegativity difference with \(Cl\) being more electronegative. \(CCl_4\) is non - polar because of its symmetrical tetrahedral …
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¿qué afirmación compara correctamente los reactivos y productos en una …
- Primera pregunta: Los enlaces de los reactivos se rompen y los productos forman nuevos enlaces. - Segunda pregunta: Las reacciones químicas que no ocurren espontáneamente necesi…
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1. an atom of silicon with 15 neutrons. ○ element name: ○ protons: ○ ne…
1. Element Name: Silicon Protons: 14 Neutrons: 15 Electrons: 14 2. Element Name: Gold Protons: 79 Neutrons: 118 Electrons: 79 3. B. Atoms of the same element with the same number …
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determine which type of change each statement represents. physical chan…
- silver spoon tarnishes: chemical change - crushing an aluminum can: physical change - copper turns a greenish color: chemical change - burning wood: chemical change - freezing w…
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¿qué sucede con los enlaces químicos durante una reacción química? * 1 …
1. Se crean nuevos vínculos mientras que los antiguos se rompen. 2. Se necesita energía para romper enlaces, y se libera energía cuando se forman nuevos enlaces.
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which of the following are properties of metals (choose all that apply)…
- For the metal properties question: - malleable - Dense - shiny - heavy - conductor of heat - For the water - molecule vibration question: water at 99°C
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magnesium reacts with hydrochloric acid to produce magnesium chloride a…
1. D. magnesium and hydrochloric acid 2. D. 37.6 mL
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if an object has a definite volume and an indefinite shape, what is it?…
1. B. Liquid 2. D. density
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a local business supplies firewood to its customers. this business peri…
$C_{6}H_{10}O_{5}+6O_{2} ightarrow6CO_{2}+5H_{2}O$
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use the data in the table to answer the following questions. how many g…
101.8 g
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what letter represents a noble gas
A. a
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question 6 10 pts which of the following rules does the following orbit…
Electrons have to fill lower energy levels before they can fill higher energy levels.
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the particles in solids are tightly packed. false true what letter repr…
1. B. True 2. A. A (assuming the far - right position in the grid represents the noble - gas group)
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looking at the graph, what is the independent variable? volume vapour p…
C. Temperature
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what is wrong with the following orbital spin diagram? 1s ↑↑ one arrow …
Question 3: One arrow should be pointing up and one arrow should be pointing down. Question 4: Phosphorus, P Question 5: Gallium, Ga
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which of the following is the correct orbital spin diagram of carbon (c…
The fourth option (with \(\uparrow\downarrow\) in \(1s\), \(\uparrow\downarrow\) in \(2s\), and \(\uparrow\ \uparrow\) in \(2p\) with one empty \(2p\) orbital) is the correct orbi…
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if a student takes different volume data points, will they get the same…
Yes, they will get the same value for the density of their solutions because density is an intensive property and for a homogeneous solution at constant conditions, the mass - to …
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3. alkali metals react very readily with halogens and form ionic compou…
The alkali metals have one valence electron, and the halogens are one short of an octet.
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electron configuration practice chemistry in the space below, write the…
1. $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}$ 3. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}$ 4. $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10…
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select all of the elements that are transition metals. a au b sr c cu d…
C. Cu, D. Co, A. Au
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1. which list consists of elements that have the most similar chemical …
F, Cl, Br
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1. using the periodic table, predict which elements will have similar c…
Magnesium, strontium, and barium
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identify each of the following elements: 1. alkaline - earth metal in p…
1. Magnesium 2. Carbon 3. Chlorine 4. Krypton 5. Silicon
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why do beryllium (be) and magnesium (mg) have similar properties? they …
They are in the same group
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identify each element as a metal, metalloid, or nonmetal. 1. silicon (s…
1. Metalloid (Silicon) 2. Metal (Gold) 3. Nonmetal (Sulfur) 4. Metal (Barium) 5. Nonmetal (Carbon) 6. Metal (Sodium)
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do we need to know the ions charges to write the formula of a simple bi…
Yes
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identify each element as a metal, metalloid, or nonmetal. 1. silicon (s…
1. Nonmetal 2. Metal 3. Nonmetal 4. Metal 5. Nonmetal 6. Metal
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4. mendeleev organized his periodic table in order of increasing atomic…
mass
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3. using his periodic table, mendeleev was able to — discover new eleme…
D. predict the properties of unknown elements
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2. classify the following as either a metal, metalloid or a nonmetal: a…
metalloid
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1. classify the following as either a metal, metalloid or a non - metal…
1. Metalloid 2. Non - metal 3. Metal
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mendeleev organized the first periodic table by atomic number. now, we …
atomic mass
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what is the formula for magnesium chloride mg2cl mgcl2 mgcl
B. MgCl₂
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#6 chemistry a schoology mendeleev organized the first periodic table b…
atomic number
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what is the formula for magnesium chloride □ mg2cl □ mgcl2 □ mgcl
MgCl₂