化学
化学反応、化学量論、分子構造、元素の性質。
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a(n) ____ builds and maintains machines such as airplanes and physical …
D. engineer
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which method would be best for separating the components of a mixture t…
B. distillation
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a solid precipitate is formed from the reaction of lead nitrate and sod…
# Explicación breve: La filtración es un método común para separar sólidos de líquidos en una mezcla heterogénea. En este caso, el precipitado sólido se puede separar del líquido …
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a chemist is studying an unknown substance and could break the substanc…
pure substance
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question 15 (5 points) saved for each of the following substances, iden…
1. $F_2$: 1. dispersion (London) 2. $SiO_2$: 8. covalent network 3. $Al_2O_3$: 9. electrostatic (ionic) 4. $NH_3$: 5. hydrogen - bond 5. $ICl$: 4. dipole - dipole
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describing gasoline consider the picture of a gas pump. which type of g…
# Explicación: ## Paso 1: Comparar las calificaciones de octano Tenemos 87 (sin plomo), 89 (media - calidad) y 91 (premium). ## Paso 2: Determinar el valor más alto 91 es el valor…
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gasoline is a common fuel. most gas stations sell multiple grades of ga…
# Breve explicación: La gasolina es una mezcla de hidrocarburos con puntos de ebullición diferentes. La destilación es un método común para separar componentes de una mezcla basad…
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gasoline is a common fuel. most gas stations sell multiple grades of ga…
mixture
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elements, compounds, and mixtures describing gasoline considering the p…
Crude oil is a homogeneous mixture.
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you may think of petroleum as motor oil or gasoline. in fact, the oil t…
# Breve explicación: El petróleo crudo contiene muchos tipos diferentes de compuestos orgánicos. Un compuesto está formado por dos o más elementos químicos en proporciones fijas, …
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mohave county animal rescue and rehabilitation ii. washing cages a. for…
B. referring to the product guidelines.
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mohave county animal rescue and rehabilitation ii. washing cages a. for…
C. remains
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24 mark for review in which of the following liquids do the intermolecu…
D. $CH_2F_2(l)$
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a molecule exhibits the trigonal planar shape. how many electron groups…
First question: B. Three Second question: C. 120 degrees
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23 mark for review the attractions between the ccl₄ molecules that hold…
C. intermolecular attractions resulting from temporary dipoles
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(b) calculate the pressure of the co₂(g) in the container at 425 k. (c)…
\(P=\frac{34.8925n}{V}\ atm\) (assuming \(n\) is in moles and \(V\) is in liters) 2. **For part (c) - Using Answer - Explanation Format):**
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quiz #2 vsepr predicts an sbf5 molecule will be which of the following …
First question: B. trigonal bipyramidal Second question: C. trigonal pyramidal
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for parts of the free - response question that require calculations, cl…
For (i): Draw closely - packed, regularly arranged circles in the box of Diagram 1 to represent solid Xe. For (ii): Draw a few scattered circles with large spaces between them in …
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the model below depicts the structure of a carbon - based molecule. in …
Carbohydrate
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question 6 (1 point) which of the following molecular geometries exhibi…
Question 6: E. linear Question 7: C. t - shaped
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question 4 (1 point) using the vsepr theory, predict that the shape of …
Question 4: B. linear Question 5: A. tetrahedral
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10. examine the following outer electron configuration and choose the c…
10. c. row 5 column 2 11. a. period 5, alkali metal 12. b. number of valence electrons 13. a. \(2+\) 14. c. \(2-\) 15. a. 1 16. c. 6 17. c. 3 18. d. 32 19. a. \(Ca\) 20. c. noble …
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which standard deviation would you prefer in a class distribution with …
$\sigma = 2$
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20 mark for review ne, hf, c₂h₆, ch₄ which of the substances listed abo…
B. HF, because its molecules form hydrogen bonds
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ionization energy is the energy needed to remove a valence electron fro…
1. a. 48 protons, 48 electrons, 72 neutrons 2. d. Sodium 3. a. a high density 4. a. unequal number of protons and electrons 5. b. mass number 6. a. potassium 7. c. decreases 8. d.…
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9 mark for review pure sample of which of the following compounds has t…
A. LiCl
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which of the following lists the substances f₂, hcl, and hf in order of…
D. $F_2 < HCl < HF$
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a sample of c₄h₁₀(g) is placed in a rigid vessel with a movable piston.…
A. The molecules strike the walls of the vessel more frequently
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a flask contains 0.25 mole of so₂(g), 0.50 mole of ch₄(g), and 0.50 mol…
D. 160 mm Hg
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count the number of atoms on each side of the chemical equations and la…
For $H_2 + O_2 ightarrow H_2O$: Unequal mass For $N_2+3H_2 ightarrow 2NH_3$: Equal mass For $4P + 5O_2 ightarrow 2P_2O_5$: Equal mass For $S_8+F_2 ightarrow SF_6$: Unequal mass
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refer to three gases in identical rigid containers under the conditions…
C. greatest in container C
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which of the following has the lowest number of unshared electrons arou…
First question: \(SF_6\) Second question: \(Br^-\) and \(Kr\)
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the diagram above shows the distribution of molecular speed in a sample…
D. The average kinetic energy of the molecules is greater at $T_2$ than at $T_1$.
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the ideal gas law best describes the properties of which of the followi…
A. $O_2$
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ethylene (c₂h₄) is a gaseous hydrocarbon which is used to synthesize di…
The first option (where there is a double - bond between the two carbon atoms and each carbon is bonded to two hydrogen atoms) is the correct electron - dot structure of ethylene.
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which of the following gases deviates most from ideal behavior? a so₂ b…
A. $SO_2$
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the image shows a periodic table with the principle groups, and shows t…
S - O
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count the number of atoms on each side of the chemical equations and la…
$H_2 + O_2 ightarrow H_2O$: unequal mass $N_2+3H_2 ightarrow 2NH_3$: equal mass $4P + 5O_2 ightarrow 2P_2O_5$: equal mass $S_8+F_2 ightarrow SF_6$: unequal mass
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when the actual gas volume is greater than the volume predicted by the …
A. volume
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a student measures the ratio (\frac{p}{t}) for a sample of gaseous (c_{…
C. The intermolecular forces between $C_{4}H_{8}$ molecules become more significant as the volume decreases.
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a student used colored balls and sticks to make a model of the compound…
D. Physical
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which of the following lewis structures correctly represent cacl2?
The second option (the one with $Ca^{2+}$ in the middle and two $[:Cl:]^{-}$ ions on either side) is correct as it properly represents the ionic nature of $CaCl_{2}$ with the corr…
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the volume of a sample of air in a cylinder with a movable piston is 2.…
C. The average kinetic energy stays the same.
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question 1 of 10 how is mass wasting different from other forms of eros…
C. It happens suddenly.
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the ratio of gases in a mixture of n₂(g) and he(g) is represented by th…
C. 0.67
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which statement best compares the melting points of magnesium and sodiu…
Magnesium has a higher melting point because it contributes one additional electron per atom than sodium in the electron sea.
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7 multiple choice 1 point if you wanted to make a crucible for melting …
B. Calcium (Ca)
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a rigid container holds 0.50 mol of ar(g) and 0.75 mol of o₂(g). how wi…
D. The total pressure will increase, and the partial pressure of $O_2(g)$ will remain constant.
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scientists at a metallurgic factory are testing different metals to stu…
B. malleable
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chf₃ has a normal boiling point of -82.1°c, and chcl₃ has a normal boil…
C. \(CHCl_3\) has stronger London dispersion forces than \(CHF_3\) does.
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15 multiple choice 1 point nonpolar substances do not dissolve in polar…
Silane ($SiH_4$)
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of two diatomic elements are listed in the table shown. substance cl₂ i…
A. iodine has the larger electron cloud, so molecules of $I_2$ are more polarizable.
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if you wanted to change the polarity of hydrogen bromide (hbr) by subst…
D. chlorine (Cl)
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the diagram above represents a particle in aqueous solution. which of t…
A. The particle must be a cation because the negative end of each water molecule is pointed toward it.
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based on coulombs law and the information in the table above, which of …
B. $Na^+$
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set up a chemical equation and determine the missing information for th…
$11.7$ g
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sodium hydroxide can be produced commercially from the electrolysis of …
B. $H_2$ because the dispersion forces in $H_2(g)$ are weaker than the dispersion forces in $Cl_2(g)$
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what is one physical property of that object? what is one way to put th…
For the first question (physical property), an example answer could be "melting point". For the second question (physical change), an example answer could be "melting". For the th…
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select the text from the paragraph that best helps you understand that …
"While most scientific findings are the result of deliberate and carefully designed experiments, occasionally a major discovery happens in a more fortuitous way."
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mohave county animal rescue and rehabilitation ii. washing cages a. for…
B. referring to the product guidelines.
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mohave county animal rescue and rehabilitation washing cages a. for sma…
C. remains
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part 2: continued 3. use the concentrations values and rates determined…
Detailed answers for each sub - question would require the actual concentration values and rates (for part 2) and a more in - depth analysis of the reaction - coordinate diagram. …
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which of these is an example of a physical change? sugar dissolving in …
sugar dissolving in warm water
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which term refers to a property that depends only on the amount of a su…
# Breve explicación: Las propiedades extensivas dependen de la cantidad de sustancia presente. La flammabilidad y la reactividad son propiedades que no dependen solo de la cantida…
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answer the following questions: 1. who originally proposed the concept …
1. Demócrito 2. John Dalton 3. Carecía de tecnología y instrumentos adecuados. 4. Electrones 5. Carga: -1,602 x 10⁻¹⁹ C, Masa: 9,109 x 10⁻³¹ kg 6. Protones y neutrones 7. Positiva…
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which of these is a chemical property of a substance? texture ductility…
C. reactividad
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which of these is an extensive property of a substance? malleability vo…
# Breve explicación: Las propiedades extensivas dependen de la cantidad de sustancia presente. El volumen aumenta o disminuye según la cantidad de la sustancia, mientras que propi…
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which statement describes a physical property of copper? it ignites at …
It can be reshaped by a force.
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a geochemist examines a piece of metal that he found in the soil. he pe…
He is identifying the metal using physical properties only.
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a student performs this experiment. step 1: she pours a colorless solut…
A. a chemical change in step 1 and a physical change in step 2
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which of these is an example of a physical change? liquid water turning…
liquid water turning into vapor
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differentiating intensive and extensive properties. the pictures to the…
# Explicación paso a paso: ## Paso 1: Comprender propiedades intensivas y extensivas Las propiedades intensivas no dependen de la cantidad de la sustancia, como el punto de fusión…
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the list includes some of the properties of butane, a common fuel. iden…
- does not react with water - burns readily in air
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identifying physical and chemical changes the list includes some of the…
- disolves easily in water - strong, unpleasant odor - gas at room temperature
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determine the number of particles in the 8.10 mol sample of c2h4o. 1 mo…
Coefficient in green box: 4.88 Exponent in yellow box: 24
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given 357 g of c2h4o, determine the number of moles of c2h4o. 1 mol c2h…
8.11
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what is the molar mass of c2h4o? 1 mol c = 12.01 g c 1 mol h = 1.008 g …
$44.05$
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part 1 - group activity (45 minutes) tutorial goals: use collision theo…
1. $C_8H_{18}O_2 ightarrow 2C_3H_6O + C_2H_6$ 2. Line C: Di - t - butyl peroxide (concentration decreases); Line A: Acetone (steeper increase as $n = 2$ in stoichiometry); Line B:…
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determine the number of particles in the 2.56 mol sample of no2. 1 mol …
Coefficient: 1.54, Exponent: 24
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what is the molar mass of no2? 1 mol n = 14.01 g n 1 mol o = 16.00 g o …
46.01
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remember... ionic bond covalent bond between a metal and non - metal (m…
| Compound | Element 1 (metal or non - metal?) | Element 2 (metal or non - metal?) | Bond Type | | ---- | ---- | ---- | ---- | | NO₂ | N = non - metal | O = non - metal | covalent…
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determine the number of particles in the 2.50 mol sample of nacl. 1 mol…
Coefficient in green box: 1.51 Exponent in yellow box: 24
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given 146 g of nacl, determine the number of moles of nacl. 1 mol nacl …
2.50
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what is the molar mass of nacl? 1 mol na = 22.99 g na 1 mol cl = 35.45 …
58.44
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determine the number of particles in the 3.60 mol sample of al2o3. 1 mo…
Coefficient: 2.17, Exponent: 24
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given 367 g of al2o3, determine the number of moles of al2o3. 1 mol al2…
$3.60$
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what is the molar mass of al2o3? 1 mol al = 26.98 g al 1 mol o = 16.00 …
$101.96$
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determine the number of particles in the 2.20 mol sample of sio2. 1 mol…
Coefficient: 1.32 Exponent: 24
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given 132 g of sio2, determine the number of moles of sio2. 1 mol sio2 …
$2.20$
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giant impact: a giant object impacted early earth and the ejected mater…
Giant impact
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name: types of chemical reaction and counting atoms for each of the che…
b) Reaction Type: Neutralization Atoms of Reactants: $H = 2$, $Cl = 1$, $K = 1$, $O = 1$ Atoms of Products: $H = 2$, $Cl = 1$, $K = 1$, $O = 1$ d) Reaction Type: Combustion Atoms …
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a chemist mixed x liters of a 4% saline solution with y liters of a 9% …
B. $0.04x + 0.09y = 0.07(x + y)$
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what is the molar mass of sio2? 1 mol si = 28.09 g si 1 mol o = 16.00 g…
60.09
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2. chemical name: bromine difluoride anion formula: brf₂⁻ lewis electro…
Lewis electron - dot structure: Br is in the center with single bonds to two F atoms. Br has 3 lone - pairs and each F has 3 lone - pairs. Perspective drawing with bond angles: Li…
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1. **write the full electron configuration for a neutral sodium atom in…
1. Ground - state electron configuration of sodium: $1s^{2}2s^{2}2p^{6}3s^{1}$ 2. Excited - state electron configuration of sodium (example): $1s^{2}2s^{2}2p^{6}3p^{1}$ 3. Orbital…
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which electrons participate in chemical bonding? any electrons the inne…
valence electrons
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water (h₂o) is composed of the same elements as hydrogen peroxide (h₂o₂…
They have different properties because the arrangement of atoms is different.
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how do an ionic bond and a covalent bond differ? a covalent bond is an …
B. An ionic bond is an attraction between oppositely charged ions. A covalent bond is a sharing of electrons between atoms.
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what is a bond called that shares electrons between two neutral atoms? …
A. covalent bond
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an ionic bond occurs between what particles? o two negative ions o two …
D. a positive and negative ion