化學
化學反應、化學計量、分子結構與元素性質。
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32. at what point should you read when measuring liquids in a graduated…
C. the bottom of the meniscus
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current attempt in progress carbon monoxide is a gas at 0 °c and a pres…
$\boxed{1.27\ \text{kg/m}^3}$ (or $\boxed{1.27\ \text{g/L}}$)
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policies current attempt in progress a mixture of ethyl alcohol (molecu…
12.9 (Units: grams)
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ammonia (nh₃) gas and oxygen (o₂) gas react to form nitrogen (n₂) gas a…
yes, 1.8
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ammonium phosphate $\\left(\\left(\\mathrm{nh}_4\ ight)_3\\mathrm{po}_4…
$\boxed{4.1}$ (or 4.0, depending on rounding; but 1.4 has 2 sig figs, so 4.1 is appropriate)
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ammonia (nh₃) chemically reacts with oxygen gas (o₂) to produce nitric …
\boxed{11}
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a major component of gasoline is octane ($ce{c_{8}h_{18}}$). when octan…
\(2.13\)
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18. what is an energy human eyes can detect? ○ mechanical ○ nuclear ○ l…
C. light
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in a certain chemical reaction compound a combines with compound b to p…
Theoretical yield of C: \( \boldsymbol{9.7} \) g Actual amount of C: \( \boldsymbol{4.9} \) g
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compound a reacts with compound b to form only one product, compound c,…
Theoretical yield of C: $\boxed{6.6}$ g Mass of B consumed: $\boxed{2.1}$ g
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14. in a car engine, what type of energy is released at a high level, l…
Thermal energy
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the drawing below shows a mixture of molecules: key carbon\thydrogen ni…
Most initial moles: \( \text{O}_2 \) Least initial moles: \( \text{CS}_2 \) Limiting reactant: \( \text{CS}_2 \)
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the drawing below shows a mixture of molecules: key carbon hydrogen nit…
- Most initial moles: \( \boldsymbol{\text{C}} \) - Least initial moles: \( \boldsymbol{\text{O}_2} \) - Limiting reactant: \( \boldsymbol{\text{C}} \) (Note: If the table require…
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section 4 — application 26. a client has a strong square jawline. which…
Curly wave pattern; because curly hair’s rounded, flowing shapes contrast with the angular square jaw to soften sharp features. ### Question 27
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22. why must form be in proportion with the clients head, face, neck, a…
For question 26: Curly wave pattern. Because a square jawline has angular, sharp features, and curly hair's rounded, soft texture creates a contrast that visually softens the stro…
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section 2 — fill in the blank 11. curly and extremely curly hair create…
11. solid 12. straight 13. zig - zag (or crimped) 14. alter (or change) 15. add 16. wide 17. sharp 18. forward 19. recede 20. lightest (or brightest) 21. Form (the shape of the ha…
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fill in the blank question the number that is assigned by the quantum m…
principal
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classify each compound below according to the naming rule to apply and …
| Chemical Compound | Naming Rule Type (ionic or covalent) | Systematic Name | | ---- | ---- | ---- | | \( PtS_2 \) | Covalent | Platinum disulfide | | \( B_2Cl_4 \) | Covalent | …
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the davis family grows organic vegetables to sell at a local farmer’s m…
- an increase in the cost of farm equipment - a rise in demand for organic produce - an increase in customers at the market
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after reviewing the new data, which reaction do you think the suspects …
The suspects used Displacement Plating. In displacement plating, copper atoms become ions (losing electrons) and zinc ions gain electrons to plate. The mass of the copper coin (26…
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of the options, which one(s) represent pi bonding? a b c d e f
b, c, d
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below is a lewis structure for a compound: lewis structure image based …
Dipole - dipole interactions, London dispersion forces
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of the options, which one(s) represent sigma bonding? a b c d e f
a, e, f
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putting it all together: complete the following chart. you may need to …
- **Cations**: 6, 7, 9 - **Neutral Atoms**: 1, 2, 4 - **Anions**: I Do, 3, 5, 8, 10 (Note: Depending on exact charge calculations, but this is the general approach based on proton…
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hexane (c6h14) can exist in multiple isomers/forms. below are two diffe…
A. n - Hexane because the molecules are longer and less compact (higher surface area)
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of the options, which one represents a p orbital overlapping with a d o…
c
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hexane (c₆h₁₄) has a molecular weight of approximately 86 g/mol and a b…
C. Ethanol has a higher boiling point because of hydrogen bonding. F. Ethanol must have stronger intermolecular forces based on its higher boiling point.
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formic acid can form two hydrogen bonds with itself. which of the follo…
The third option (the one with the structure showing $\ce{O - H\cdots O}$ and $\ce{O\cdots H - O}$ hydrogen bonds in a cyclic - like arrangement for two formic acid molecules)
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the molecular formulas and boiling points of three alcohols are shown b…
London dispersion forces (the option: London dispersion forces)
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remember, a metal ion can only take electrons from a metal that has the…
The suspects used additive plating. Because in displacement plating, copper (less active than zinc) can't donate electrons to zinc ions (as a metal ion takes electrons from a meta…
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rank the following molecules in terms of increasing boiling point: • c₃…
A. \( \text{N}_2 < \text{C}_4\text{H}_8 < \text{C}_3\text{H}_7\text{OH} < \text{LiCl} \) (where A is the first option in the list of choices)
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below is a lewis structure for the nitrate polyatomic ion. :o: | o=n—o:…
(for sigma bonds): 3
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read this excerpt from “sea fever” by john masefield. and the wheel’s k…
C. The fixed meter and predictable rhyme scheme create an upbeat rhythm.
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question 7 of 35 why are some foods called temperature control for safe…
D. Bacteria can grow on these foods if in the Danger Zone between 41°F and 135°F.
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warm up thursday, dec 4 possible points: 100 explain the solution types…
- First Glass: The lemonade in the first glass is an unsaturated solution as the added sugar (solute) dissolves completely, showing the solvent can still accept more solute. - Sec…
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3. what is solubility? give an example 4. which of the following factor…
La solubilidad es la capacidad de un soluto para disolverse en un solvente. Ejemplo: sal en agua. # 4.
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which sentence from the passage includes a subordinating conjunction? \…
The option: "Most recently, these architects have been trying to create environmentally friendly structures that serve the needs of the population, while still aesthetically pleas…
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question 7 - multiple choice chemical used to defoliate the jungles of …
agent orange
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question 4 (1 point) an ionic bond is a bond between a metal and anothe…
False
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question 3 (4 points) cations are ______ atoms that lose electrons and …
Blank 1: metales Blank 2: positivamente Blank 3: no metales Blank 4: negativamente
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question 2 (1 point) ions are a charged particle. true false
True
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question 24 (1 point) what is the energy? (δh) progress of the reaction…
\(- 20\ \text{kJ}\) (Opción d)
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there are approximately how many naturally occurring elements? 108 98 1…
The option corresponding to 92 (assuming it is one of the labeled choices, e.g., if 92 is an option like "B. 92" based on typical formatting) is the correct answer. However, based…
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question 22 (1 point) what is the energy (δh)? reaction pathway pe (kj)…
a. \(50\ \text{kJ}\)
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multiple-choice question the periodic table of elements tells you how m…
protons
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question 20 (1 point) what type of reaction is the freezing of water? a…
b. Exothemic
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a substance that is made up of just one kind of atom is called an _____…
Element
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question 19 (1 point) what type of reaction is the evaporation of water…
a. Endotérmico
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a substance that is made up of just one kind of atom is called an .....…
Element
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question 18 (1 point) what type of reaction is the melting of ice? a ex…
b. Endotérmica
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question 16 (1 point) what type of reaction occurs when cooking an egg?…
A. Endothermic
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question 15 (1 point) is the rusting of iron exothermic or endothermic?…
b. Exothermic
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a substance that is made up of just one kind of atom is called an _____…
Element
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question 14 (1 point) is the combustion of methane (ch₄) exothermic or …
B. Exothermic
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2. a mixture of neon and argon gases exerts a total pressure of 2.39 at…
The partial pressure of argon is approximately \( 55.7 \, \text{kPa} \) (or 56 kPa, depending on rounding). ### Problem 3
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question 11 (1 point) is burning wood an endothermic or exothermic proc…
A. Exotérmic
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multiple-choice question there are ______ different types of atoms. 18 …
118
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question 10 (1 point) in an endothermic reaction, do the products have …
a. Higher
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dalton’s law of partial pressures scenarios directions: solve the probl…
(for Q1): The partial pressure of nitrogen is \(\boldsymbol{65 \, \text{kPa}}\) (for Q2: ~55.7 kPa or 56 kPa).
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question 9 (1 point) in an exothermic reaction, do the products have hi…
b. Lower
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question 8 (1 point) what happens to the temperature of the surrounding…
b. Decrease
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question 7 (1 point) what happens to the temperature of the surrounding…
A. Increases
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question 6 (1 point) in an endothermic reaction, is energy released to …
B. Absorbed
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question 5 (1 point) in an exothermic reaction, is energy released to o…
A. Release
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what does the prefix endo- mean in chemistry? a within, to enter b outs…
A. Within, to enter
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question 3 (1 point) what does the prefix exo- mean in chemistry? a wit…
B. Outside, to exit
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multiple-choice question ______ is the tiniest particle of nonliving ma…
An atom
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question 2 (1 point) what is an endothermic reaction? a release energy …
B. absorb energy from their surroundings, causing the temperature to decrease
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question 1 (1 point) what is exothermic reactions? a release energy int…
A. release energy into their surroundings, causing the temperature to increase
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multiple-choice question atoms can combine to make__________. neutrons …
Molecules
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where are synthetic polymers derived from? plants animals man - made
man - made (the option with the label "man - made")
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read this excerpt from a passage. in 2008, the once thriving company to…
C. The CEO was obviously aware of the corruption happening in her company and even encouraged it for her own gain.
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question 3 (1 point) what is the name for the compound sf₄
Tetrafluoruro de azufre
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question 2 (1 point) a cation has a negative charge. true false
False
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question 1 (1 point) a covalent bond is a bond between two ______. word…
non - metals
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this versatility enables life to form in various environments and adapt…
A. triple bonds
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which statement about the effect of temperature on the speed of sound i…
B. As temperature increases, the speed of sound increases because molecules in the medium collide more frequently.
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what happens when thermal energy is applied to water? (1 point) its mol…
C. Its molecules gain kinetic energy.
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question 8 (3 points) write the formula name bas _______ nai _______ rb…
- BaS: bario sulfuro - NaI: sodio yoduro - Rb₂F: rubidio fluoruro
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question 7 (1 point) ions are a charged particle. true false
True
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where do the forces that make atoms interact come from? (1 point) from …
B. from the electric fields of charged subatomic particles
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question 5 (3 points) li⁺ + .cl: → li:cl: the image above shows a _____…
Blank 1: iónico Blank 2: litio Blank 3: cloro
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question 4 (1 point) what kind of bond is the image below? o=c=o a neit…
B. Covalent Bond
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question 3 (1 point) what kind of bond does this image show? na· + cl: …
A. Ionic Bond
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what type of carbon bond strengthens the stability and functionality of…
B. double/triple bond
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when do you use the prefixes below for naming bonds? prefixes 1\tmono 2…
d. Only Covalent Bonds
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what type of polarity is present in carbon covalent bonds? weakly polar…
strongly polar
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what type of three - dimensional arrangement can carbon form that contr…
A. ring structure
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allotropes of carbon graphite structure diamond structure what is one t…
ring structures
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a nurse is caring for a client who was prescribed an antidepressant bas…
Pharmacologic action
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metalloids some elements are one of the above.\ they do not fit neatly …
## Procedure: 1. Observe luster: Check if the sample is shiny (metallic luster) or dull. 2. Test malleability: Try bending/hammering the sample—if it bends without breaking, it’s …
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pregunta 11 (1 punto) balancee la siguiente reacción (simplemente escri…
Espacio en blanco 1: \(1\) Espacio en blanco 2: \(3\) Espacio en blanco 3: \(2\)
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pregunta 11 (1 punto) balancee la siguiente reacción (simplemente escri…
Espacio en blanco 1: \(1\) Espacio en blanco 2: \(3\) Espacio en blanco 3: \(2\)
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pregunta 9 (1 punto) ¿por qué se utiliza ácido sulfúrico en las batería…
Pregunta 9: A. Reacciona con placas de plomo para producir electricidad para el automóvil. Pregunta 10: 1. Síntesis - e. \(Ca + Cl_2 ightarrow CaCl_2\) 2. Descomposición - d. \(Ca…
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pregunta 3 (1 punto) ¿cuál rango de ph corresponde a los ácidos en la e…
a. De 0 a 7, siendo 0 el ácido más fuerte. # Pregunta 4
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2. a chemist discovers a new element with 2 valence electrons. is the e…
XO
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2. a chemist discovers a new element with 2 valence electrons. is the e…
Yes, the element is likely to be ductile.
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passage 1 identifying sentences with clear reference read each sentence…
That the paragliders managed to stay in perfect formation was amazing.
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pregunta 1 (1 punto) ¿qué determina si un líquido se clasifica como áci…
Pregunta 1: C. La concentración de iones de hidrógeno ($H^{+}$) o iones de hidróxido ($OH^{-}$) presentes en el líquido. Pregunta 2: A. El líquido es neutro, ni ácido ni básico.
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a reaction at 12.0 °c evolves 715. mmol of sulfur tetrafluoride gas. ca…
$16.7L$