Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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dalton concluded that compounds are made up of what? dalton concluyó qu…
Atoms of elements they are made of.
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is a halogen used in gaseous and liquid form for large - scale disinfec…
Chlorine
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in 1808, which scientist got back to democritus original idea of atoms?…
John Dalton
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multiple - choice question what does \atomos\ mean in greek? ¿qué signi…
Indivisible
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3. an element has the following natural abundances and isotopic masses:…
The average atomic mass of the element is approximately \(\boldsymbol{49.81 \, \text{amu}}\) (or \(49.811 \, \text{amu}\) for more precision).
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question 10 according to _, the cause of female delinquency is a male d…
Question 10: A. critical feminism Question 11: B. It strongly predicts more frequent, varied, and sustained criminality later in life.
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question 1 according to this theory, our culture polarizes males and fe…
- Question 1: C. gender schema - Question 2: A. early onset of delinquency
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7. which reactant(s) would undergo a reaction that is both a synthesis …
d. a metal and oxygen
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consider these compounds: a. ( mathrm{ca}_{3}left(mathrm{po}_{4} ight)_…
Barium phosphate is more soluble than \(A\). Barium phosphate is less soluble than \(B\) and \(D\). It is not possible to determine whether barium phosphate is more or less solubl…
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three flasks, each containing a gas sample, are set up as shown below. …
\(1.82\)
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a gas has a density of 2.08 g/l at 48°c and p = 1.07 atm. what will be …
Density at \(157^{\circ}C\): \(1.55g/L\); Molar mass: \(51.7g/mol\)
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a gas mixture contains 12.1 mol of c₂h₂ and 20.6 mol of h₂. compute the…
\(x_{C_2H_2,\text{initial}} = 0.370\); \(x_{C_2H_2,\text{new}} = 0.344\)
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aluminum reacts with excess aqueous hydrochloric acid to produce hydrog…
(a) \(2Al(s)+6HCl(aq) ightarrow2AlCl₃(aq) + 3H₂(g)\) (b) \(6.12\ g\)
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a sample of he gas is observed to effuse through a porous barrier in 5.…
\(47.9\)
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use the references to access important values if needed for this questi…
- With lower average speeds, on average the molecules hit the walls of the container with less force. - At lower temperatures molecules have lower average speeds. - As the average…
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oxygen gas can be prepared by heating potassium chlorate according to t…
\(9.0\)
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use the references to access important values if needed for this questi…
\(6.30\)
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use the references to access important values if needed for this questi…
\(11.55\)
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use the references to access important values if needed for this questi…
\(884mmHg\)
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a sample of nitrogen gas occupies a volume of 6.90 l at 53°c and 914 mm…
\(223\)
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use the references to access important values if needed for this questi…
\(12.8\)
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use the references to access important values if needed for this questi…
(A) \(104^{\circ}C\) (B) \(13.4\ L\)
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use the references to access important values if needed for this questi…
(A) \(1184\) mL, (B) \(0.516\) atm
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nitrogen monoxide is a pollutant commonly found in smokestack emissions…
\(18.7\space L\)
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a sample of a gas mixture contains the following quantities of three ga…
CO: \(410\space mmHg\) \(CO_{2}\): \(390\space mmHg\) \(SF_{6}\): \(195\space mmHg\) total: \(995\space mmHg\)
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stp (standard temperature and pressure) is used as a reference point fo…
\(41.3\space L\)
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mastication is the process of chemically reducing food bulk into smalle…
False
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quiz 4 15 what is the function of bile? multiple choice emulsify fats t…
Emulsify fats to assist in their chemical digestion
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practice it how does charles law affect the efficiency of gas exchange …
Temperature affects the volume of gases within the lungs which can impact gas exchange efficiency.
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practice it what happens to the volume of a gas when its temperature in…
Volume increases
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what is charles law? the volume of a gas is directly proportional to it…
The volume of a gas is directly proportional to its temperature when the pressure and the amount of gas are held constant.
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here is a sketch of the radial probability distribution of three orbita…
53 pm
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practice it what happens to pressure when volume increases (according t…
Pressure decreases
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what is boyles law? boyles law refers to the relationship between press…
The pressure of a gas is inversely proportional to its volume when the temperature and the amount of gas are held constant.
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here is a sketch of the radial probability distribution of three orbita…
1400
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this energy diagram shows the allowed energy levels of an electron in a…
| Question | Answer | |--|--| | What is the energy of the electron in the ground state? | \(400\space zJ\) | | What is the energy of the electron in the first excited state? | \(9…
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it takes 163 kj/mol to break an nitrogen - nitrogen single bond. calcul…
\(734\space nm\)
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a lewis structure for the nitrate ion (no₃⁻) is shown on the left below…
The equivalent resonance structure can be drawn by moving the double bond from one oxygen to another. For example, if in the given structure the double bond is with the bottom - l…
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draw the lewis structure for sulfate (so₄²⁻) with minimized formal char…
\(4\)
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draw the lewis structure for ammonium (nh₄⁺). does this molecule exhibi…
B. No
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violins made by antonio stradivari and other craftspeople in the sixtee…
B. the sound quality of Cremonese violins results in part from a method the craftsp eople used to alter the wood.
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draw the lewis structure for the perchlorate ion (clo4^-) with minimize…
4 (assuming the options were cut off and the correct count is 4. If we consider the general rule for \(ClO_4^-\), when minimizing formal charges (Cl has +1 formal charge and three…
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which represents the correct equilibrium constant expression for the re…
La tercera opción \(K_{eq}=\frac{[Cu^{2+}]}{[Ag^{+}]^{2}}\) es la correcta.
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which statement correctly defines dynamic equilibrium? at dynamic equil…
At dynamic equilibrium, the rates of forward and reverse reactions are equal.
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aa + bb ←→ cc + dd what is the equilibrium constant expression for the …
\( K_{eq}=\frac{[C]^c[D]^d}{[A]^a[B]^b} \) (la primera opción de las opciones dadas)
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which statement correctly describes a reaction in dynamic equilibrium? …
At dynamic equilibrium, the reactions continue but the amounts of reactants and products do not change.
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nh₄cl(s) ←→ nh₄cl(g) if the system is at dynamic equilibrium, which sta…
The rate of sublimation of the \(NH_4Cl\) crystals is equal to the rate of solidification of the \(NH_4Cl\) vapors.
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2n₂o₅(g) ↔ 4no₂(g) + o₂(g) if the reaction is at dynamic equilibrium at…
The concentrations of the products and reactants do not change.
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calculate the ph of the following mixtures given ( k_{a}=1.8\times10^{-…
A. 4.7447
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the reaction below is at dynamic equilibrium. n₂(g) + 3h₂(g) ↔ 2nh₃(g) …
La tasa de la reacción directa equals the rate of the reverse reaction.
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which statement best describes how dynamic equilibrium relates to a sat…
Each second, the amount of solid sodium chloride that dissolves equals the amount of solid sodium chloride that recrystallizes.
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which lists all of the substances that appear in equilibrium constant e…
pure gas and aqueous solution
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in the atmosphere, under the effect of ultraviolet rays, oxygen molecul…
The rates of the forward and reverse reactions will remain the same.
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the production of water proceeds according equation. 2h₂(g) + o₂(g) → 2…
Place the reactants in a smaller container.
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an increase in temperature affects the reaction rate by increasing the …
Increasing the number of molecules that have sufficient kinetic energy to react.
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which applies to the collision theory? particles need to collide in ord…
Particles need to collide in order to react.
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which will cause an increase in the reaction rate between molecules? el…
C. Molecules collide more frequently.
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ben observes how quickly some dry wood is burning in a campfire. which …
reaction rate
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which topic is commonly used to explain activation energy and how chemi…
collision theory
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a solid reactant is placed into a beaker of a warm water. the liquid vi…
Fewer bubbles will be produced because of fewer collisions of reactant molecules.
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which term refers to the speed at which reactants are converted into pr…
B. reaction rate
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2nh₃(g) ←→ n₂(g) + 3h₂(g) which is most likely the effect to the forwar…
The reaction rate decreases.
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iron reacts with oxygen to form iron oxide (rust). which best describes…
Iron oxide is formed by rearranging atoms.
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sodium combines with water to produce sodium hydroxide and hydrogen gas…
sodium + water → sodium hydroxide + hydrogen
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this formula equation is unbalanced. bacl₂(aq) + na₂co₃(aq) → baco₃(s) …
2
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propane burns in air to produce carbon dioxide and water. what is this …
combustion
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if a substance reacts with oxygen, the chemical reaction is most likely…
B. combustion reaction.
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chemical reactions shown below is a chemical reaction. fe + cucl₂ → fec…
\(FeCl_2\) and \(Cu\)
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the formation of which product(s) will most likely be observed in a com…
an oxide
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a double replacement reaction can be best described as a reaction in wh…
ions are exchanged between two compounds.
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a chemical reaction in which one element replaces another element in a …
single displacement reaction.
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which type of chemical reaction occurs in ca + cl₂ → cacl₂? synthesis c…
synthesis
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considering the activity series given for metals and nonmetals, which r…
# Explicación: ## Paso 1: Comprobar la serie de actividad para la reacción \(Pb + Zn(C_{2}H_{3}O_{2})_{2}\to Zn + Pb(C_{2}H_{3}O_{2})_{2}\) En la serie de actividad de metales \(A…
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in which type of chemical reaction do two or more substances combine to…
synthesis
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which type of chemical reaction occurs in 2kclo₃→2kcl + 3o₂? double rep…
decomposition
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which is a characteristic of a decomposition reaction? substance x comb…
Substance \(XYZ\) breaks down into \(X\), \(Y\), and \(Z\).
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using the activity series provided. which reactants will form products?…
Solo la reacción $Fe + Cu(NO_3)_2 →$ forma productos.
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select the independent clause. after a lightning bolt passes through th…
the compression and subsequent rapid expansion of the air molecules produces the booming sound of thunder
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according to the focus on neuroscience box: the addicted brain, one eff…
B. the normally reinforcing experiences of everyday life are no longer reinforcing or satisfying.
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isopropanol burns in oxygen to yield carbon dioxide, water, and heat. w…
isopropanol + oxygen → carbon dioxide + water + heat
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which symbol can be used to indicate the pressure at which a chemical r…
2 atm
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which equation has both a liquid and a gas as products? 2kclo₃(s)→2kcl(…
\(2HgO(s)\to2Hg(l)+O_{2}(g)\)
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the compound fecl₃ is made of one atom of iron and three atoms of carbo…
one atom of iron and three atoms of chlorine.
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fluorine gas is placed in contact with calcium metal at high temperatur…
# Explicación breve: Para determinar la ecuación correcta, se deben considerar los reactivos (flúor gaseoso y calcio metálico) y el producto (fluoruro de calcio). Además, se debe …
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which formula equation represents the burning of sulfur to produce sulf…
\(S(s)+O_2(g)\xrightarrow{\Delta}SO_2(g)\)
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which statement best descnbes the formula equation cl₂(g) + 2kbr(aq) → …
Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
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what is the formula equation for the reaction between sulfuric acid and…
# Explicación breve: Para determinar la ecuación correcta, debemos considerar los reactivos dados (ácido sulfúrico \(H_2SO_4\) y sodio hidróxido \(NaOH\)) y verificar que los prod…
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which word equation shows hydrogen reacting with oxygen to form water? …
hydrogen + oxygen → water
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ic 25 - 26 physical science 1 writing and balancing chemical equations …
1 \(CH_4\) + 2 \(O_2\) → 1 \(CO_2\) + 2 \(H_2O\)
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make sure you have balanced the separation of water equation. enter you…
2 \(H_2O\) - 2 \(H_2\) + 1 \(O_2\)
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ic 25 - 26 physical science 1 writing and balancing chemical equations …
1 \(N_{2}\) + 3 \(H_{2}\) → 2 \(NH_{3}\)
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explaining how and why cheese melts kai takes a hamburger off of the gr…
The cheese melts because heat is transferred from the hot hamburger (higher - temperature object) to the cheese (lower - temperature object). The heat causes the cheese molecules …
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multiple choice 2 points how many elements of unsaturation do molecules…
8
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multiple choice 2 points what two atomic orbitals or hybrid atomic orbi…
C. \(Csp^{2}+Hs\)
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multiple choice 2 points name the alkene shown. be sure to include the …
(E)-1-bromo-4-chlorohept-3-ene
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27 multiple choice 2 points which sequence ranks the following compound…
3 < 1 < 2
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26 multiple choice 2 points which of the alkyl chlorides listed below u…
B. 3 - chloropentane
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multiple choice 2 points how many elements of unsaturation are implied …
C. 1
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multiple choice 2 points which of the following alkenes has the largest…
1 - hexene
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multiple choice 2 points if a certain hydrocarbon molecule has 10 carbo…
12