Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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la parte más pequeña de un elemento que tiene las propiedades de ese el…
molécula
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pregunta 5 la parte más pequeña de un elemento que tiene las propiedade…
[Seleccionar] átomo
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dos o más átomos combinados químicamente es un molécula. dos o más elem…
# Breve Explicación: La cantidad de espacio que ocupa un objeto se denomina volumen, mientras que la cantidad de materia en un objeto se llama masa. Estos son conceptos básicos en…
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dos o más átomos combinados químicamente es un molécula. dos o más elem…
elemento
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dos o más átomos combinados químicamente es un seleccionar. dos o más e…
1. molécula 2. compuesto 3. volumen 4. masa
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pregunta 1 3 puntos un seleccionar es una mezcla heterogénea don selecc…
[suspensión] es una mezcla heterogénea donde [partículas sólidas] se depositan en el fondo. [solución] es una mezcla homogénea.
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una propiedad de una sustancia que se puede observar sin cambiar lo que…
# Breve Explicación: Las propiedades químicas son aquellas que se presentan cuando una sustancia experimenta un cambio en su composición química. La descripción dada se ajusta a u…
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¿cuáles de estos son evidencia de que se ha producido un cambio químico…
- Primera pregunta: Cambio de color, Formación de burbujas - Segunda pregunta: Verdadero
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¿cuáles de estos son cambios químicos? el agua hierve en vapor una llav…
- ¿Cuáles de estos son cambios químicos? - una llave inglesa dejada afuera comienza a oxidarse - Un ácido corroye un metal - El almidón se convierte en azúcar cuando se digiere - …
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elija las propiedades físicas color tamaño habilidad para artimañar inf…
Para "Elija las propiedades físicas": - Color - tamaño - inflamabilidad - peso Para "¿Cuáles son los cambios físicos?": - un cubo de hielo se derrite - una ventana se rompe - una …
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16. which of these will most likely happen if an enzyme is added to a c…
The activation energy will be lowered. The rate of reaction will start to increase.
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how many protons do all atoms of carbon (c) have in the nucleus? 6 12 3
6
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atomic structurenic particles swarntom doos science particle location c…
Inside the nucleus.
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test periodic table and trends put the letter of the answer in the blan…
1. C. Arsenic, antimony, silicon 2. C. Carbon 3. C. K 4. D. In order of increasing atomic mass 5. A. Lithium and potassium 6. B. I, IV and V are true 7. A. Rb is the largest becau…
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rpcc chem 1010l: postlab - electron configuration name glorious namazue…
Element Electron Configuration: Calcium (Ca): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}$ Strontium (Sr): $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}$ Barium (Ba): $1s^{2}…
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10. a radioisotope has a half - life of 4 days. how much of a 20 - gram…
10 g
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which of the following reactions are double replacement reactions? o na…
$\text{NaOH}+\text{HCl} ightarrow\text{HOH}+\text{NaCl}$
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which of the following reactions are single replacement reactions? ca +…
$Na + HCl ightarrow H_2 + NaCl$, $K + AgCl ightarrow Ag + KCl$
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#5 chemistry a schoology 2025 8. what is a half - life? did you write t…
The time required for the quantity of a substance (often a radioactive substance) to reduce to half of its initial amount.
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atomic subatomic particles considering all 3 subatomic particles (their…
Positive
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11. does element a or element b have a higher electronegativity? a. ele…
11. a. Element A because it is smaller and holds electrons more tightly. 12. d. phosphorus 13. c. 4 14. a. Sr, Be, Ca 15. a. A and D only 16. c. B, C and E only 17. c. - 1 18. A) …
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atomic structural particles swanson does science sub - atomic particle …
The nucleus
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11. does element a or element b have a higher electronegativity? a. ele…
11. a. Element A because it is smaller and holds electrons more tightly. 12. a. chlorine 13. c. 4 14. a. Sr, Be, Ca 15. a) A and D only 16. b) C and E only 17. c) - 1 18. A) oxyge…
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the rate law equation relates reaction rate to the concentrations of
reactants
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13. what is the correct relationship between monomers and polymers? mon…
Monomers are subunits of polymers.
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atomic structural particles swanson does science sub - atomic particle …
positive
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chemical reaction rates refer to how quickly are transformed into .
Reactants; products
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chemistry i prefix conversions hw convert the following. be sure to inc…
1. $0.972L$ 2. $49.622kg$ 3. $12.8\mu m$ 4. $0.44873km$ 5. $12.0005cm$ 6. $4.4kJ$ 7. $0.663kN$ 8. $1000dm^{3}$ 9. $0.0086m^{3}$ 10. $1.2L$ 11. $0.062m^{3}$ 12. $1.86cm$
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for each property listed, identify the type of element it describes. ve…
1. Metal 2. Metalloid 3. Non - metal 4. Metal, Non - metal, Metalloid 5. Non - metal
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what type of decay is pictured below? fusion alpha decay gamma decay fi…
Fission
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the rate law equation relates reaction rate to the concentrations of
reactants
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which elements are metalloids? check all that apply. boron tungsten alu…
boron, silicon, tellurium
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#5 chemistry a schoology 2025 half - life is the amount of mass it take…
After one half - life, 50% of the original will remain. After two half - lives, 25% of the original will remain. After three half - lives, 12.5% of the original will remain.
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test periodic table and trends put the letter of the answer in the blan…
1. C. arsenic, antimony, silicon 2. C. carbon 3. C. K 4. d. in order of increasing atomic mass 5. a. lithium and potassium 6. Analyze each statement based on periodic table knowle…
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iii. practice with equations try these. 1. $_{27}^{60}co\ ightarrow\\bo…
1. $_{28}^{60}Ni$ 2. $_{42}^{99}Mo$ 3. $_{54}^{131}Xe$ 4. $_{57}^{137}La$ 5. $_{10}^{23}Ne$ 6. $_{88}^{225}Ra$
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directions: use a periodic table to find the information asked for belo…
1. Calcium: 20, Iron: 26, Gold: 79, Uranium: 92 2. Calcium: 40, Iron: 55.8, Uranium: 238, Copper: 63.5 3. Calcium: 20, Gold: 79, Copper: 29, Iron: 26 4. Gold: 79, Iron: 26, Copper…
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4 below are several substances present in cereal. look at the diagram o…
| Substance | E, C or M? | What made you classify it this way? | |--|--|--| | Water | C | Different atoms ($H$ and $O$) are chemically combined | | Sugar (Glucose) | C | Multiple …
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what is the most likely reason rita dove chose to call this poem a sonn…
The poem contains 14 lines.
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focus question: can you separate out iron from breakfast cereal? backgr…
| Element in Cheerios | Chemical Symbol | | ---- | ---- | | Sodium | Na | | Potassium | K | | Calcium | Ca | | Iron | Fe | | Phosphorus | P | | Magnesium | Mg | | Zinc | Zn |
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which of the following is influenced by the polarity of bonds in the wa…
4) All of the above
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question 9 (1 point) listen which of the following will have resonance …
1) Molecule with more than one correct Lewis structure
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which of the following does not apply to electronegativity? check all t…
3. Electronegativity decreases across a Period and increases down a Group 4. H - O bond is less polar than H - C bond
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which of the following does not apply to electronegativity? check all t…
3. Electronegativity decreases across a Period and increases down a Group 4. H - O bond is less polar than H - C bond
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question 7 (1 point) listen which of the following can form covalent bo…
2) $Cl_2$
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youre eating what for breakfast? focus question: can you separate out i…
Calcium - Ca, Iron - Fe, Phosphorus - P, Magnesium - Mg, Zinc - Zn, Sodium - Na, Potassium - K
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ethanol, c₂h₅oh, is made industrially by the reaction of water with eth…
\(-44\ kJ\)
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which of the following will have a double bond between c and c, and wil…
2) $C_2H_4$
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which of the following will have a bent molecular geometry (not electro…
4) All of the above
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question 4 (1 point) listen when a metal atom transfers one or more ele…
2) Ionic
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sulfate ion so₄²⁻ will have which of the following? (hint: you will hav…
1) Tetrahedral for both electron and molecular geometries
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question 2 (1 point) listen which of the following has been stated corr…
3) Br⁻ ion will have the electronic configuration of Ar
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when there is unequal sharing of electrons to form a bond, which of the…
It is between two nonmetals, It is covalent bond, It is polar covalent bond, There is partial charge on both atoms, resulting in dipole moment
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how would a 3d model of glucose differ from the formula model? (1 point…
C. A 3D model shows how the different atoms are arranged, but the formula model does not.
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copper metal can be produced by heating copper(1) oxide and hydrogen ga…
$4.1\ kJ$
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what element does the electron configuration represent? 1s² 2s² 2p⁶ o a…
neon
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electron configuration assignment what is the element is shown by the e…
Sr
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label the correct way to write electron configuration. 2p⁴ energy level…
Left - hand box: Energy Level Middle box: Type of orbital (shape) Right - hand box: Number of electrons
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electron configuration assignment what element is represented by the el…
B. aluminum
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electron configuration assignment how many electrons can the 3d orbital…
C. 10
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given the following thermochemical data, the $delta_{r}h^{circ}$ for th…
C. $-3.12\times10^{2}\text{ kJ}$
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what is the correct electron configuration for the element shown below?…
1s² 2s² 2p⁴
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electron configuration assignment which orbital fills first, 4s or 3d? …
A. 4s
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electron configuration assignment what is the element is shown by the e…
Sulfur (S)
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what element is represented by the electron configuration below? 1s² 2s…
phosphorus
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electron configuration assignment what is the element is shown by the e…
Argon (Ar)
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another way to write the equation c₂h₆(g) ⇌ c₂h₂(g) + 2 h₂(g) δh = +3.2…
a. $2H_2(g)+C_2H_2(g) ightleftharpoons C_2H_6(g)+3.2\times10^{2}\text{kJ}$ (Note: The sign of energy in this option is wrong for the forward reaction but it is the closest in term…
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electron configuration assignment what is the element is shown by the e…
Niobium (Nb)
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electron configuration assignment what is the element is shown by the e…
Arsenic (As)
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why is the water cycle considered a closed system on earth? water molec…
Water is constantly recycled.
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question 1 advancements in chemical instrumentation have not lead to ne…
False
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question a molecule has: select the correct answer below: ○ length ○ ma…
D. all of the above
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homework: balance the redox reactions in both acids basic media ② $pbo_…
Acidic medium: $5PbO_2+I_2 + 8H^+ ightarrow 5Pb^{2 + }+2IO_3^-+4H_2O$ Basic medium: $5PbO_2+I_2 + 4H_2O ightarrow 5Pb^{2 + }+2IO_3^-+8OH^-$
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alchemy is considered an early form of chemistry. true false
True
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question 1 chemistry was practiced throughout the ancient world. true f…
True
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no chemical reaction can take place in a vacuum true false
False
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read the lines from act i, scene v of romeo and juliet. romeo: to julie…
C. Romeo's lines make up one quatrain, which uses an abab rhyme scheme.
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covalent bonds worksheet #2 name: draw the lewis structure for the mole…
The Lewis structures and names for the given substances (or substances assumed from the given elements) are as described above for each case.
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question 4 not yet answered marked out of 1.0 p flag question an enthal…
B. the difference in the chemical potential energies of the reactants and the products in a chemical change
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4. what are three common clues that a chemical change has occurred? 5. …
4. Production of gas, formation of a precipitate, change in color. 5. A chemical change forms new substances with different chemical properties; a physical change only alters phys…
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inside a calorimeter, the energy gained by the surroundings (the water)…
True
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writing and naming ionic compounds fill in each column with the appropr…
See the completed table above.
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13. where do the tetrahedra bond to each other? a. the center of the si…
B. at any oxygen atom
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melting and boiling points of some substances substance melting point b…
5. melting; boiling 6. Evaporation (or Distillation) 7. physical 8. Chemical 9. precipitate 10. gas 1. The properties of a compound are different from those of its constituent ele…
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name 10. what physical properties of nylon and leather make them good m…
10. b. durability and flexibility 11. d. the size of their particles 12. d. composition 13. c. oxygen 14. d. change in shape 15. d. water breaking down into hydrogen and oxygen Co…
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a radioactive nuclide that is used for radiation therapy for cancer has…
$^{60}_{27}Co$ (corresponding to the last option in the multiple - choice list)
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multiple choice write the letter that best answers the question or comp…
1. b. compounds 2. c. element 3. b. Al 4. d. compound 5. d. sand 6. a. homogeneous mixture 7. b. size of its largest particles 8. d. gold 9. a. water
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continue questions below*** 8. what are pools (reservoirs) - 9. what is…
8. Pools (reservoirs) are storage sites in biogeochemical cycles. 9. Residence time is the average time a substance stays in a pool. 10. Flux is the rate of transfer between pools…
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vocabulary review use what you know about the vocabulary terms listed o…
A mineral
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sentence check 1 using the answer line provided, complete each item bel…
1. I. permeate 2. B. forestall 3. H. opportune 4. E. interrogate 5. J. retribution 6. A. disparity 7. C. insidious 8. G. omnipotent 9. D. insinuate 10. F. obsequious 1 - 2. A. dis…
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to prevent accidental poisoning, you should not __________. a mix chemi…
C. keep materials in unlabeled containers
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part 2 - applied density problems 1. ethanol has a density of 0.789 g/c…
1a. $177.525\ g$ 1b. $95.1\ cm^{3}$ 2. Density of water is approximately $1\ g/mL$, meaning 1 mL of water has a mass of 1 g. 3. Density of olive oil is approximately $0.903\ g/cm^…
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what role does water play in the earths energy system? it only affects …
It stores and transfers energy due to its high heat capacity and phase changes
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the diagram shows the electron configuration around the chlorine nucleu…
7, 7+
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the figure shows the elements of period 3 and the first 3 elements of g…
Se, Na, Na, Ar, O
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in this performance task, you will answer 4 questions. the united natio…
Nh
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in this performance task you will answer four questions. the electron c…
Atom X = 1, Atom Y = 7
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based on the periodic table, which other element is likely to share com…
A. Cs
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with the exception of he, how many valence electrons do noble gases hav…
B. 8
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the table shows the first, second, and third ionization energies of fou…
D. 4 2 3
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oxygen reacts with many different elements to form different molecules.…
NO (g), CO (g)