化学
化学反応、化学量論、分子構造、元素の性質。
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which of the following lists two examples of mixtures? a salad dressing…
b. air; gelatin
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which of these describes the formation of a mixture? a sodium and chlor…
c. sugar crystals dissolving in water
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what is a combination of two or more substances that are not chemically…
Mixture
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the lewis diagram for a neutral phosphorus atom is shown below. p compl…
To produce a stable ion, a neutral phosphorus atom will $\boldsymbol{\text{gain}}$ $\boldsymbol{3}$ electron(s).
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what is the name of a heterogeneous mixture with large particles that w…
Suspension
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group 1 elements (not including hydrogen) are called alkali metals. whe…
To produce stable ions, alkali metals \(\boldsymbol{lose}\) \(\boldsymbol{1}\) electron(s) to form ions with a \(\boldsymbol{+1}\) (or positive one) charge.
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3) list the types of evidence that a physical change has taken place 4)…
Change in state (e.g., melting, freezing), change in shape/size (e.g., tearing, cutting), dissolving, separation, or change in appearance (examples include freezing water, tearing…
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which drug contains the chemical thc and affects specific receptors in …
C. marijuana
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3) list the types of evidence that a physical change has taken place 4)…
- Change in state (e.g., melting, freezing, boiling, condensing) - Change in shape or size (e.g., tearing, cutting, breaking) - Dissolving (if no chemical reaction occurs, like di…
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question 3 of 3 select the best answer: what should employees do before…
C. Read and understand the label and Safety Data Sheet (SDS)
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question 2 of 3 select the best answer: if a chemical splashes into the…
A. Eye damage and pain
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replication cellular respiration bonding dna the hydrogen bond is weak …
Bonding
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chemistry for exercises 41-43, the ph of a solution describes its acidi…
100 times ### Problem 42: (Assuming vinegar has pH ~2, baking soda ~9; difference is \( 9 - 2 = 7 \), so \( 10^7 \) times. But since details are missing, general approach:
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part i - physical vs chemical changes 1) list the types of evidence tha…
- Color change - Gas production (bubbles/fizzing) - Precipitate (solid) formation - Energy change (heat, light, sound) - Odor change (new smell) ### Question 2 (Identify chemical …
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multiple choice 1 point a mutual electrical attraction between the nucl…
The correct option is the second one (the one with the filled circle): chemical bond.
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20 multiple choice 1 point a mutual electrical attraction between the n…
The option with "chemical bond" (the second option from the top, with text "chemical bond").
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Question was provided via image upload.
- Na is a $\boldsymbol{\text{metal}}$ and Cl is a $\boldsymbol{\text{non - metal}}$. - Na $\boldsymbol{\text{loses}}$ 1 electron, Cl $\boldsymbol{\text{gains}}$ 1 electron. - Form…
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19 multiple choice 1 point the electrons involved in the formation of a…
D. valence electrons.
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17 multiple choice 1 point as atoms bond with each other, they increase…
D. decrease their potential energy, thus creating more - stable arrangements of matter.
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if two covalently bonded atoms are identical, the bond is nonpolar cova…
A. nonpolar covalent
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review & key points summarize the following: - bonds hold atoms ____. -…
- Bonds hold atoms **together**. - Ionic = **electrons** transfer - Covalent = **electrons** sharing
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15 multiple choice 1 point when atoms share electrons, the electrical a…
B. electronegativity
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14 multiple choice 1 point if the atoms that share electrons have an un…
B. polar (assuming the options are labeled as A. nonpolar, B. polar, C. ionic, D. dipolar)
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13 multiple choice 1 point nonpolar covalent bonds are not common becau…
A. one atom usually attracts electrons more strongly than the other.
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12 multiple choice 1 point the greater the electronegativity difference…
A. ionic
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the pair of elements that forms a bond with the most covalent character…
O and Cl.
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- conduct when ___________ - covalent bonds: - ______________ structure…
- Metal + Nonmetal = Ionic Bond - Nonmetal + Nonmetal = Covalent Bond - Use the Periodic Table to check element types (For Covalent Bonds section, typical answers: - \_\_\_\_\_\_\…
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10 multiple choice 1 point a neutral group of atoms held together by co…
D. molecule
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convert: centigrams = 0.1 grams submit
10
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9 multiple choice 1 point which of the following is not an example of a…
B. B
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8 multiple choice 1 point when a covalent bond forms, the potential ene…
B. decreases.
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• na is a metal • na loses 1 electron; cl gains 1 electron • forms an i…
- Ionic Bonds: - \_\_\_\_\_\_\_\_\_\_\_\_\_ structures: Crystalline - \_\_\_\_\_\_\_\_\_\_\_\_\_ melting points: High - Conduct when \_\_\_\_\_\_\_\_\_\_\_\_\_: Dissolved in water…
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7 multiple choice 1 point a formula that shows only the types and numbe…
A. molecular formula.
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a covalent bond forms between a metal and a nonmetal 2 nonmetals no ans…
B. 2 nonmetals (suponiendo que la segunda opción sea la que dice "2 nonmetals" con el identificador correspondiente, por ejemplo, si la segunda opción es la B, entonces: B. 2 nonm…
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an ionic compound that has a polyatomic ion will have more than element…
2 (la opción es "2", correspondiente a la primera opción marcada con el círculo azul: "2")
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an ionic compound that has a polyatomic ion will have more than ____ el…
A. 2 ### Second Question (Greek prefixes are used when naming)
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positive ions are called select . negative ions are called select selec…
cationes
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when naming binary ionic compounds, the negative ions element name is c…
A. ide ### Second Question (Calcium in Calcium Bromide)
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in the compound potassium nitride, nitride is an anion all of these neg…
B. all of these ### Second Question (Name of \(V_2S_3\))
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question 24 the of the compound cuo is ○ copper oxate ○ copper (i) oxid…
copper (II) oxide
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question 25 the name of the compound scl₄ is ○ sulfur chloride ○ monosu…
sulfur tetrachloride (la opción: sulfur tetrachloride)
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question 26 the name of the compound $\\ce{nf_3}$ is \\bigcirc nitrogen…
D. Nitrogen trifluoride
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match the reaction type to its equation synthesis choose decomposition …
# Explanation: ## Step 1: Analizar reacción de síntesis La reacción de síntesis es cuando dos o más sustancias se combinan para formar una sola. La fórmula general es \( A + B igh…
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question 28 4 pts □ na + □ h₂o → □ naoh + □ h₂
Los coeficientes son: 2 (Na), 2 (H₂O), 2 (NaOH), 1 (H₂)
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question 16 of 25 a group of students measure the mass of a soil sample…
C. 64.58 g
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3.单选题（10分）已知φ-（pb²⁺/pb）=-0.1266v，kₛₚ-（pbcl₂）=1.7×10⁻⁵，则φ-（pbcl₂/pb）=（）v…
A. -0.268
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use the following data to determine the least to most polar molecule n-…
Least to most polar: $N - N$, $N - O$, $H - Cl$, $H - F$
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which statements are true concerning covalent bonds? select two correct…
D. Covalently bonded compounds usually have low melting and boiling points. E. Covalent bonds form between two nonmetals. ### Second Sub - Question (Substance as Glass)
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which of the following best describes the arrangement of electrons in a…
C. Electrons are delocalized in a "sea of electrons" and are shared among the positively charged metal ions. ### Second Question (Substance with Described Bonding)
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10. substance a is a gas, substance b is a liquid and substance c is a …
C. \( C > B > A \) ### Second Sub - Question (Ionic Bonds)
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types of reaction practice please label the type of reaction using the …
1. S 2. D 3. DR 4. C 5. SR 6. D 7. S 8. SR 9. C 10. SR 11. D 12. S 13. DR 14. D 15. S 16. DR
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8. which of the following pairs correctly matches a compound with its m…
D. methane ($CH_4$): tetrahedral E. carbon tetrachloride ($CCl_4$): tetrahedral ### Second Sub - Question (Property Responsible for Ionic Crystal Lattice)
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Question was provided via image upload.
The correct option is the last one (the fourth structure in the given image, with the triple bond and appropriate lone pairs on each N atom, i.e., the structure :N::N:). If we ass…
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b. hydrogen and fluorine 3. which of the following combinations of elem…
A. Hydrogen and phosphorus ### Second Question (Relating electronegativity and ionization energy to covalent bonds)
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electronegativity is a measure of an atoms ability to attract and bond …
D. Lithium < Carbon < Nitrogen < Chlorine < Oxygen < Fluorine
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which is the correct formula for hydrochloric acid? a. clh b. hcl c. h₂…
B. HCl
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for an upcoming research project, a sociologist plans to study how wome…
macrosociology
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mastery quiz: ionic bonding 1. which is the appropriate name for cacl₂?…
D. Calcium chloride
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what is the name for $\\ce{po_4^{3-}}$? a. phosphate b. phosphide c. ph…
A. Phosphate
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what is the correct formula for sulfuric acid a. soh b. h₂so₄ c. h₂s d.…
D. $H_2SO_4$
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mastery quiz: ionic bonding 8. *which lewis dot diagram below correctly…
9. (C) +2 10. (B) The Lewis dot structure with 6 dots around X (the second option) 11. (B) \(QX\) 12. (D) sulfur 13. (A) solid
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which sequence of elements is arranged in decreasing order of atomic ra…
A. Al, Si, P
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the alchemist claims that the boy can turn himself in to this. options:…
Wind (the orange - colored option labeled "Wind")
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mastery quiz: ionic bonding 1. *which is the appropriate reason for cac…
1. Calcium Chloride (assuming "CACL" is CaCl₂) 2. (C) Many ionic compounds form a lattice structure, which results from ions of opposite charge attracting to one another 3. (B) ne…
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in an ion, there are positively charged protons and negatively charged …
\((9)(+1)+(10)(-1)\)
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homework: what type of bond is it? 1. calcium atom and an oxygen atom? …
s (for each question): 1. Ionic Bond 2. Metallic Bond 3. Covalent (Non - Polar) Bond 4. Covalent (Non - Polar) Bond (Triple) 5. Ionic Bond 6. Metallic Bond 7. Covalent (Non - Pola…
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excerpt from \the jungle\ it narrated how he jurgis rudkus was working …
C. conditions in the packing houses were contaminated.
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3. calculate the enthalpy of the following chemical reaction: (4) cs₂(l…
The enthalpy of the reaction is \(\boxed{-1075.0 \, \text{kJ/mol}}\)
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1. for the decomposition reaction 2ab → a₂ + b₂, the concentration of a…
The average rate of change in the concentration of \(AB\) is \(\boldsymbol{- \frac{16}{175}\space mol/(L\cdot min)\approx - 0.091\space mol/(L\cdot min)}\) (or if we consider the …
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8. consider the following chemical equations and their respective entha…
d. + 256 kJ
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e. \\( 9\\,\\text{mol/(l·min)} \\\\ 8. \\text{consider the following ch…
d. +256 kJ
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the zip code would eventually become a fixture in american life, someth…
2. Scanning machines could be used to read the codes and automatically sort mail 4. Mr. Zip raised awareness of the codes even though some postal workers did not like him
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7. during a chemical reaction, the concentration of reactant a changes …
a. 0.015 mol/L·s
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6. in the chemical reaction: \\( \\mathrm{ch}_4 + 2 \\mathrm{o}_2 \ igh…
b. \( 2 \, \text{mol/(L·min)} \)
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what is ddt? a wrestling move performed on television a popular pestici…
B. a popular pesticide used during world wars
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5. which property listed below does not apply to a catalyst? a. lowers …
e. Converts a single step reaction into more, lower energy steps
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match the food components and their definitions column a \t\t\t\tcolumn…
1. c 2. d 3. e 4. b 5. a ### Question 2 (Ranking Fats)
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air pressure, a measure of the force with which air molecules push down…
B. Differences in air pressure
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1/100 which group on the periodic table contains the noble gases? group…
B. Group 18 (8A) (assuming the options are labeled as A. Group 17 (7A), B. Group 18 (8A), C. Group 2, D. Group 1; if the original options' identifiers are different, adjust accord…
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what is the charge on an oxygen ion after it gains two electrons? -1 0 …
The option with -2 (the third option, labeled -2).
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neutralization reactions worksheet directions: complete the neutralizat…
(for each reaction, here's the balanced equation, names, and states as an example for Reaction 1): ## Reaction 1: Balanced Equation: \( \boldsymbol{2\text{HCN (aq)} + \text{Ba(OH)…
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which of the following is the correct way to dispose of chemical waste …
B. Follow the teacher's instructions for disposal
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1/100 electron arrangement that uses arrows orbital diagram shorthand c…
A. Orbital diagram
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which element has the highest electronegativity? fluorine (f) iodine (i…
A. Fluorine (F)
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5/100 which element is classified as a metalloid? neon sodium silicon o…
Silicon (the option with "Silicon" text, which is the third option from the left among the given choices)
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3. the gas phase reaction a + 2b → c has a reaction rate that is experi…
a. 0
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which is the electron configuration for an oxygen atom? $1s^2 2s^2 2p^4…
The first option: \(1s^2 2s^2 2p^4\)
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2. a decrease in temperature will decrease the rate of a reaction princ…
e. More particles have energy less than the activation energy
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1. for the reaction a + b → c, which statement is correct concerning th…
d. C forms at the same rate as each of A and B are used up
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name: abby gerald /30 1. for the reaction a + b → c, which statement is…
c. \( C \) forms at the same rate as each the reactants \( A \) and \( B \) are used
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2. select the correct word or words given in the brackets. (a) complete…
$\ce{K_{2}SO_{4} + 2H_{2}O}$ ### Question 2(b)
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11. the elements in group 17 are called the ______ 12. the elements in …
11. halogens 12. 1 13. 17 14. 18 15. 1 16. 17 17. 18 18. 1
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drag the right word to its definition the wearing down of rock over tim…
weathering
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the water cycle is the continuous movement of water between the earth’s…
c) solar
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periodic table worksheet name: 1. tell which element is located in the …
s: ## Question 1: a. Zirconium (Zr) b. Beryllium (Be) c. Tungsten (W) d. Helium (He) e. Tin (Sn) f. Zinc (Zn) g. Francium (Fr) h. Polonium (Po) i. Chlorine (Cl) j. Silver (Ag) k. …
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match each sds section number to what it includes section 3 section 2 s…
Section 1 - Name, synonyms, and the supplier’s emergency contact Section 2 - Hazards and precautionary statements Section 3 - The Chemical Abstracts Service (CAS) registry number …
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students list various factors on earth and the effects of each factor i…
A. CONDITIONS THAT SUPPORTED THE ORIGIN OF LIFE
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convert the following celsius degrees to fahrenheit. 55°c select one of…
131°F
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question 2. which of the following correctly identifies the formula of …
\(\text{FeCl}_3\) (the third option: \(\boldsymbol{\text{FeCl}_3}\))
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question 3. element x reacts with copper to form the compounds cux and …
Group 17