Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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¿cuáles de las siguientes ecuaciones están balanceadas? * □ no₂ + h₂o →…
The balanced equations are: - \( \boldsymbol{2H_2 + O_2 ightarrow 2H_2O} \) - \( \boldsymbol{AgNO_3 + NaCl ightarrow AgCl + NaNO_3} \) (Additionally, if the first equation was int…
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how many grams is 3.93 moles of calcium sulfate, caso₄? answer
\( \approx 535 \) grams
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¿cuáles de las siguientes ecuaciones están balanceadas? * □ no₂ + h₂o →…
The balanced equations are \( 2\text{H}_2+\text{O}_2\to2\text{H}_2\text{O} \) and \( \text{AgNO}_3+\text{NaCl}\to\text{AgCl}+\text{NaNO}_3 \) (and also, wait, let's re - check the…
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mole conversion practice 3 formula 20 points complete the following con…
84.16
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10) balance the equation by typing the correct numbers in each blank. t…
10) $1\ \text{P}_4 + 6\ \text{Br}_2 ightarrow 4\ \text{PBr}_3$ 11) $2\ \text{LiCl} + 1\ \text{Br}_2 ightarrow 2\ \text{LiBr} + 1\ \text{Cl}_2$ 12) $1\ \text{PbBr}_2 + 2\ \text{HCl…
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complete the following conversion. you should show the work on your own…
$165.91$
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Question was provided via image upload.
7) $\boldsymbol{2NO + O_2}$ 8) $1\text{AlBr}_3 + 3\text{K} ightarrow 3\text{KBr} + 1\text{Al}$ 9) $1\text{FeO}+1\text{PdF}_2 ightarrow 1\text{FeF}_2+1\text{PdO}$
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formula 10 points complete the following conversion. you should show th…
7.37
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una ecuación química se equilibra cambiando o añadiendo * símbolos quím…
C. coeficientes ### Second Question:
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6) check the box if the statement describes the balanced or unbalanced …
1. $\boldsymbol{4Sb + 3O_2 ightarrow Sb_4O_6}$: Check **Balanced** box 2. $\boldsymbol{H_3AsO_4 ightarrow As_2O_5 + H_2O}$: Check **Unbalanced** box 3. $\boldsymbol{SiO_2+HF ighta…
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formula 10 points complete the following conversion. you should show th…
\( 2.37 \)
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en una reacción exotérmica, la energía se transfiere desde * lost react…
# Breves Explicaciones: En una reacción exotérmica, la energía se libera del sistema (los reactivos que se convierten en productos) hacia el entorno. Entonces, la energía fluye de…
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formula 10 points complete the following conversion. you should show th…
23.09
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5) choose the best answer. what is the balanced equation for the combus…
B. $2\text{Mg}(s) + \text{O}_2(g) ightarrow 2\text{MgO}(s)$
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formula 10 points complete the following conversion. you should show th…
The number of moles of iridium in \( 184.14 \) grams is approximately \( \boldsymbol{0.96} \) moles.
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3) choose the best answer. which chemical equation demonstrates the law…
3) $\boldsymbol{H_2SO_4 ightarrow H_2O_2 + SO_2}$ 4) $\boldsymbol{4PH_3 + O_2 ightarrow P_4H_{10} + 2H_2O}$
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1) choose the best answer. which of these describes the law of conserva…
1. Mass cannot be created or destroyed as a result of a chemical reaction. 2. mole
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7) choose the best answer. for their lab report, students must describe…
Solid zinc and lead nitrate, dissolved in water, react to form aqueous zinc nitrate and solid lead.
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5) choose the best answer. hydrogen cyanide (hcn) and water (h₂o) are p…
### Question 5 $\boldsymbol{\text{CH}_4 + \text{NH}_3 + \text{O}_2}$ ### Question 6 $\boldsymbol{\text{PbCl}_2 \text{ and } \text{H}_2\text{O are the products.}}$ $\boldsymbol{\te…
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3) choose the best answer. the following shows chemical equations that …
3) $\text{PbI}_2$ 4) 3
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for the lab report, students must describe a chemical reaction in words…
1. Correct option: $\boldsymbol{\text{FeCl}_2 \text{ and } \text{Cl}_2 \text{ are the products}}$ 2. Correct option: $\boldsymbol{\text{Solid zinc and lead (II) nitrate, dissolved…
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3) choose the best answer. the following shows chemical equations that …
1. For the first question: $\text{Br}_2$ 2. For the second question: $\text{PbI}_2$
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1) drag and drop the terms with the descriptions. any substance that un…
- reactant: any substance that undergoes a chemical change in a chemical reaction - product: a substance formed from another substance as a result of a chemical reaction - catalys…
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16. match the molecule diagrams with the lewis structures (the right si…
- $\boldsymbol{H-\underset{\underset{H}{|}}{C}-H}$ (CH₄) → Tetrahedral - $\boldsymbol{H-\underset{\underset{H}{|}}{\overset{\overset{..}{N}}{}}-H}$ (NH₃) → Trigonal pyramidal - $\…
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2. choose the best answer using the image. which is the stronger force,…
Labeled A
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1. choose all that apply. due to low intramolecular forces, most covale…
B. liquids D. gases
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3. choose the best answer. which of these make the best conductor of el…
metallic bonding
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6. choose the best answer using the periodic table. what is the name of…
iron (III) oxide
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7 choose the best answer using the periodic table. what is the correct …
The second option (structure: :F: single-bonded to N, which is single-bonded to another :F: and :F:, with one lone pair on N and three lone pairs on each F)
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choose the best answer using the periodic table. which type of bond is …
8. metallic bond 9. phosphorus trichloride
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10. choose the best answer using the periodic table. which of the follo…
10. a compound with triple bonds 11. magnesium phosphide 12. $\text{Li}_2\text{O}$
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12 choose the best answer using the periodic table. what is the formula…
13. $\boldsymbol{N_2O_3}$ 14. $\boldsymbol{polar\ covalent\ bond}$ 15. $\boldsymbol{ionic\ bond}$
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3. use the periodic table to choose the best answer. which of these is …
D. $\boldsymbol{\ce{H - \underset{\Large{\boldsymbol{\cdot \cdot}}}{N} - H\\ \quad \mid\\ \quad H}}$
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Question was provided via image upload.
1. $\text{PF}_3$ → trigonal pyramidal 2. $\text{BeF}_2$ → linear 3. $\text{CCl}_4$ → tetrahedral 4. $\text{GeF}_2$ → bent 5. $\text{BF}_3$ → trigonal planar
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choose the best answer. two elements have an electronegativity differen…
polar covalent
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match the vocabulary term with the definition. open for help. fossil fu…
a general term for any hydrocarbon that can be used as fuel: chiefly petroleum, natural gas, and coal, which are derived from ancient organic matter (the corresponding definition …
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q15. choose the best answer. the coefficients of a balanced chemical eq…
## Question 14: 1. composition stoichiometry is the study of the relationship between the quantities of the elements in a compound. 2. reaction stoichiometry is the study of the r…
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11. choose the best answer. scientists discover the percent composition…
12. C. 36.04% 13. For every 100 g of FeSO₄, there are 21.1 g of S.
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what compound contains the highest percent composition of cobalt? \\(\\…
1. $\text{Co(NO}_2\text{)}_2$ 2. graham crackers 3. $6.02 \times 10^{23}$
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unit 6 quiz 1 chemistry (2nd edition) - semester b / unit 6 - stoichiom…
1. 3.22 × 10²³ molecules 2. 58.44 3. 373.88 4. when the limiting reactant is used up
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question (part banning) - semester 6 / unit 6 - stoichiometry q19. choo…
1. $\boldsymbol{5.1 \times 10^{22}}$ molecules 2. Na: $\boldsymbol{39.34}$%, Cl: $\boldsymbol{60.66}$% 3. Rb: $\boldsymbol{90.93}$%, O: $\boldsymbol{9.09}$%
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a student compared a mole of ethane, c₂h₆ molecules, to a mole of acety…
- Both samples have an equal number of carbon atoms. - Both samples have an equal number of molecules.
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what is the final product of the sequence shown? chemical reaction and …
A. The structure with the alkyl chain and -OH group as shown in option A (matching the product of Grignard addition to aldehyde followed by protonation).
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what is the product of the sequence shown? (chemical reaction sequence …
D. \(\boldsymbol{\text{Cyclopentyl - CH(OH) - CH}_3}\) (the structure corresponding to option D)
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which reagents would you use to accomplish the following transformation…
c. 1. \( \text{CH}_3\text{MgBr} \), 2. \( \text{H}_3\text{O}^+ \)
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which carbonyl compound would you treat with nabh₄ to produce the alcoh…
C. The ketone with a phenyl ring and a methyl group attached to the carbonyl carbon (acetophenone - type structure)
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which statement about this reaction is correct? 1. lialh₄ 2. h₃o⁺ a. th…
b. The products are diastereomers, formed in approximately equal amounts.
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multiple choice 1 point what is the major organic product obtained from…
A. The ketone - containing compound (the structure with the carbonyl group on the second carbon of the 5 - carbon chain, with a methyl and an ethyl group attached to the carbonyl …
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8. the diameter of a titanium atom (ti) is 0.294 nm. express this measu…
a. $2.94 \times 10^{-10}\ \text{m}$
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melanie began studying a sample of the chemical element einsteinium-253…
Every day, $\boldsymbol{4}$% of mass is $\boldsymbol{subtracted from}$ the total mass of the sample.
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calculate the molar mass of each of the following compounds, then deter…
1) Percent composition of CO: Carbon = 42.88%, Oxygen = 57.12% 2) Percent composition of $\text{C}_2\text{H}_6$: Carbon = 79.89%, Hydrogen = 20.11% 3) Percent composition of Fe in…
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select the correct answer option: which explanation best explains why e…
The paint cans are airtight and prevent evaporation of residual chemicals.
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7. how many cubic centimeters (cm³) are there in 1.00 in³? a. 0.0609 cm…
d. $16.4\ \text{cm}^3$
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which of the following molecules are deprotonated by ethyl magnesium br…
E. All of the above
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clemence began studying a sample of the chemical element einsteinium-25…
Every day, the mass of the sample shrinks by a factor of $0.96$.
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what is the major organic product obtained from the following sequence …
b. pentane
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hich of the following elements has the largest atomic mass? a. oxygen (…
b. Chlorine (Cl)
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5) choose the best answer. which compound contains the highest percent …
$\text{Cu}_2\text{SO}_3$
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c) choose the best answer. a scientist discovers the percent compositio…
For every 100 g of FeSO₄, there are 36.7 g of Fe.
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which sentence better matches the image? bobs mother took him, at four …
Bob's mother took him, at four years of age, to visit the chemistry lab where she worked.
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5. how many atoms are there in 0.55 moles of argon (ar)? a. 3.31x10²³ b…
a. $3.31 \times 10^{23}$ --- For the second question (identifying the element with the largest atomic mass):
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pour brûler une certaine masse de méthane, on a utilisé 125litres d’air…
Volume de méthane brûlé (et donc de $\ce{CO2}$ produit) : $\boldsymbol{12,5\ \text{L}}$ ; Masse de $\ce{CO2}$ : $\boldsymbol{24,55\ \text{g}}$
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question 6 consider an electrolytic cell formed by two half reactions b…
- 0.226 V (corresponding to the option - 0.226 V)
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a scientist discusses the percent composition for iron oxide (fe₃o₄) sh…
For every 100 g of FeSO₄, there are 36.7 g of Fe. --- ### Second Question (Invalid Percent Composition)
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9. ___ (nh₄)₃po₄ + ___ pb(no₃)₄ → ___ pb₃(po₄)₄ + ___ nh₄no₃ 10. ___ se…
9. $4\text{(NH}_4\text{)}_3\text{PO}_4 + 3\text{Pb(NO}_3\text{)}_4 ightarrow \text{Pb}_3\text{(PO}_4\text{)}_4 + 12\text{NH}_4\text{NO}_3$ 10. $\text{SeCl}_6 + \text{O}_2 ightarro…
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1) choose the best answer. what is used to determine the percent compos…
1. molar mass 2. 92%
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1) choose the best answer. what is used to determine the percent compos…
1. B. molar mass 2. A. 92%
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according to the text, which of the following best describes the result…
C. President Nixon removed American troops from Vietnam after several years of protest.
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8. benzene (c6h6) consists of a six membered ring of carbon atoms with …
The Lewis structure of benzene (\(C_6H_6\)) has a six - membered carbon ring with one hydrogen atom attached to each carbon. The two main resonance (Kekulé) structures are: 1. A h…
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name exothermic and endothermic – practice instructions: identify which…
The egg ### 2)
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6. a river flowing through soft rock dissolves some of the rock and car…
6. Chemical weathering, then erosion by water 7. Physical weathering, then erosion by water and gravity
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3. a river carries mud and dirt out of the land it runs through. this i…
3. Erosion 4. Plant roots grow into cracks in rocks 5. Erosion by ice
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u4 - d1 (weathering, erosion and deposition) hi jotsch. when you submit…
1. B. Mechanical weathering 2. D. Deposition
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part 3: solving for neutrons sometimes the periodic table doesnt give y…
1. 4 2. 10
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a chemist has an empty cylinder with a height of 30 cm and a cone - sha…
10 cm
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3. water 1 what type of drinking water should be available for school k…
The right part of the image (the multiple - choice question) is not fully visible, so the specific question and the complete options are unclear. However, based on the left - hand…
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which one of the following reactions is a redox reaction? none of these…
Pb + 2Cl → PbCl₂
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write the formula / formula unit for the following compounds determinin…
| # | Name | Cation (+) | Anion (-) | Formula | |---|--------------------|------------|-----------|---------------| | 1 | Sodium Chloride | $\text{Na}^{1+}$ | $\text{Cl}^{1-}$ | $…
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2) how are fossil fuels formed? what is required?
Fossil fuels (coal, petroleum, natural gas) form from the remains of ancient plants/animals. Over millions of years, organic matter is buried under sediment, then transformed by h…
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the scarcest natural element is ______. astatine uranium francium quest…
1. francium 2. Actinium
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this is the study of measurements. mythology metrology engineering ques…
1. metrology 2. Corson
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20. which of the following lewis dot formations is correct from the opt…
d) $:\ddot{\text{O}}-\ddot{\text{S}}-\ddot{\text{O}}:$
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question 3 1 pts number 137, hypothetically the last element, has alrea…
Question 3: feynmanium Question 4: Oklo
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counting atoms the formula for a compound indicates the elements that m…
1. Aspirin: C = carbon 9, H = hydrogen 8, O = oxygen 4 2. Magnesium hydroxide: Mg = magnesium 1, O = oxygen 2, H = hydrogen 2 3. Paradichlorobenzene: C = carbon 6, H = hydrogen 4,…
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you can become more familiar with the atomic structure of some common s…
| Valence Electrons | Substance | Symbol | Atomic Number | Mass Number | Number of Protons | Number of Neutrons | Number of Electrons | |-------------------|------------|--------|…
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what characteristic from the piece proves it is a work of fiction? a. t…
D. The passage has a setting, and the reader can learn the characters' thoughts.
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1.7 1.2.4 interpret simple examples of representing elements and compou…
- Number of protons: 30 - Number of electrons: 30 - Mass number: 67 - Number of neutrons: 37 ### 2C. For \( \boldsymbol{Ca_3(PO_4)_2} \) #### A. Calcium atoms The subscript for Ca…
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b) choose all that apply. which three elements can hydrogen form a hydr…
8) - fluorine - nitrogen - oxygen 9) Weakest → Strongest: dispersion, dipole-dipole, hydrogen
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7) choose the best answer. which of the following is not a type of bond…
6. intramolecular force 7. fixative bond
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label b is pointing to which force type? metallic force potential energ…
intramolecular force
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2) choose the best answers using the image. label a is pointing to whic…
intermolecular force
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1) drag and drop the words with the descriptions. the type of attractio…
- intermolecular forces → the type of attraction between molecules - electrostatic attraction → the attraction between the nucleus and electrons in an atom - chemical bond → an at…
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what must an odorant be in order for it to be smelled? liquid plasma ga…
Gaseous
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un átomo de aluminio se combina con tres átomos de cloro para formar el…
B. flúor ### Second Question (Formula of potassium oxide)
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la sal de mesa (nacl) es un compuesto que se forma cuando interactúan l…
D. electrón ### Second Question:
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un químico necesita una sustancia que prácticamente no participe en rea…
D. 18 ### Second Question (Isótopos)
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¿qué afirmación describe la formación de enlaces iónicos? * los átomos …
D. Los metales transfieren electrones a los no metales. ### Second Question (¿Qué elemento es un gas a temperatura ambiente?):
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la lista muestra las propiedades químicas de un elemento desconocido. p…
A. grupo 1
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¿qué enunciado describe cómo determinar el número de protones en un isó…
C. El número de protones es igual al número atómico del isótopo. ### Second Question (Elemento que reacciona similar a sodio con agua)
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6. what was your charge after you gained/lost electrons? why? 7. what k…
If I lost electrons, my charge was positive (cation) because I had more protons than electrons. If I gained electrons, my charge was negative (anion) because I had more electrons …