化学
化学反应、化学计量、分子结构与元素性质。
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pregunta 6 (4 puntos) (04.02 mc) an unbalanced chemical equation is sho…
a. Two \(H_2O_2\) molecules should decompose to form the given products.
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pregunta 5 (4 puntos) (04.02 lc) which of the following is a synthesis …
C. \(SO_{3}+H_{2}O - H_{2}SO_{4}\)
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(04.02 mc) which chemical equation correctly represents the reaction th…
# Explicación breve: Para determinar la ecuación química correcta, debemos recordar que la descomposición del amoníaco (\(NH_3\)) produce nitrógeno (\(N_2\)) e hidrógeno (\(H_2\))…
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pregunta 3 (2 puntos) (04.02 lc) a decomposition reaction always breaks…
b. False
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(04.02 lc) what is true of a decomposition reaction? o a the reactants …
C. The addition of energy in the form of heat or electricity is often required.
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pregunta 1 (2 puntos) (04.02 lc) the reaction co₂(g) → c(s) + o₂(g) is …
a. True
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a textbook store sold a combined total of 236 chemistry and math textbo…
Number of chemistry textbooks sold: \( 177 \) Number of math textbooks sold: \( 59 \)
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which is a possible example of species that can comprise a buffer solut…
C. \( \ce{H2PO^−4} \) and \( \ce{H3PO4} \)
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question 14 · 1 point what is the hydronium ion concentration of a solu…
A. \(5.0\times 10^{-10}\text{ M}\)
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question 13 - 1 point what is the ph of a solution with a poh of 6.2? s…
A. 7.8
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all substances are made up of small particles of matter that are consta…
Gas particles are always moving.
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question 12 · 1 point an aqueous solution at 25°c has a hydronium ion c…
\(1.0\times 10^{-10}\text{ M}\)
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question 11 · 1 point which of the following is the term for the reacti…
autoionization
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question 10 · 1 point what is the formula for the conjugate acid of dih…
B. \(H_3PO_4\)
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question 9 - 1 point a solution of a compound in water conducts electri…
\(C_3H_5(COOH)_3\)
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the diagram below is a model of two solutions. each solution a solution…
Solution B
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the diagram below is a model of two solutions. each ball represents one…
neither; their concentrations are the same
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the diagram below is a model of two solutions. each ball represents one…
Solution A
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what is the osmotic pressure of a 0.50 l solution that contains 0.15 g …
0.047 atm
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the diagram below is a model of two solutions. each ball represents one…
Solution A
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the diagram below is a model of two solutions. each ball represents one…
Solution A
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question 6 · 1 point in the equation ( c_1v_1 = c_2v_2 ), what does ( c…
C. Concentration
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the diagram below is a model of two solutions. each ball represents one…
Solution B
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question 5 - 1 point a solution of koh contains 15.0 g of koh in 185.0 …
B. 8.11%
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question 4 · 1 point non - polar solutes are soluble in which of the fo…
C. non - polar solvents
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the diagram below is a model of two solutions. each pink ball represent…
Solution A
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question 3 · 1 point suppose a solution is described as concentrated. w…
None of the above
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the diagram below is a model of two solutions. each purple ball represe…
Solution A
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question 2 · 1 point of the following, which is a characteristic of non…
They produce no ions when dissolved in water.
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question 1 · 1 point what is the molarity of cacl₂ when 1.92 mol of cac…
A. \(3.73\ M\)
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the diagram below is a model of two solutions. each green ball represen…
Solution A
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the diagram below is a model of two solutions. each purple ball represe…
Solution A
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question when bases are introduced into the blood, the concentration of…
\(HCO_3^-\)
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the diagram below is a model of two solutions. each pink ball represent…
Solution B
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the diagram below is a model of two solutions. each purple ball represe…
Solution B
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the diagram below is a model of two solutions. each yellow ball represe…
neither; their concentrations are the same
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the diagram below is a model of two solutions. each blue ball represent…
neither; their concentrations are the same
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the diagram below is a model of two solutions. each yellow ball represe…
Solution A
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the diagram below is a model of two solutions. each green ball represen…
Solution B
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the diagram below is a model of two solutions. each yellow ball represe…
Solution A
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the diagram below is a model of two solutions. each green ball represen…
Solution A
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the diagram below is a model of two solutions. each purple ball represe…
neither; their concentrations are the same
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the diagram below is a model of two solutions. each blue ball represent…
Solution A
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which of the following is most likely a result of increased globalizati…
A. Changing attitudes about beauty in Japan
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the diagram below is a model of two solutions. each pink ball represent…
Solution B
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nuclear energy uses which of the following processes? a. gamma radiatio…
B. Fission or fusion
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question if we add acid to a buffer containing nach₃ch₂coo and ch₃ch₂co…
NaCH₃CH₂COO
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question in a buffer solution made of acetic acid and sodium acetate, a…
acetic acid
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question in a buffer solution made of acetic acid and sodium acetate, i…
D. acetate ions
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the diagram below is a model of two solutions. each yellow ball represe…
Solution A
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the diagram below is a model of two solutions. each green ball represen…
Solution A
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question when acid is added to the blood through the digestion process,…
$H_2CO_3$
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the diagram below is a model of two solutions. each purple ball represe…
Solution A
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question a buffer solution in which the ( k_{mathrm{a}} ) of the acid i…
acidic
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current objective classify solutions as an acidic, basic, or neutral ba…
C. $-\log[\text{OH}^-]$
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question a solution that has a greater hydroxide concentration than hyd…
basic
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question determine the concentration of hydronium ions for a 25°c solut…
$3.2\times10^{-11}\text{ M}$
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what is the hydronium ion concentration of a solution at 25°c with a po…
\(7.943\times 10^{-7}\text{ M}\)
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identify the option below that is a characteristic of acidic solutions.…
pOH levels greater than 7 at \(25^{\circ}C\)
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identify the option below that is a characteristic of neutral solutions…
pH levels of 7 at 25 °C
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the diagram below is a model of two solutions. each pink ball represent…
Solution A
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question suppose that a 25 °c solution has a poh of 8.6. what is the co…
B. \(3.981\times10^{-6}\text{ M}\)
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question what is the poh of a solution at 25.0°c with h₃o⁺ = 9.90 × 10⁻…
\(2.996\)
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choose the option below that is an acid ionization reaction. select the…
\(H_{2}O + HF ightleftharpoons F^{-}+H_{3}O^{+}\)
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question roughly how many water molecules are ionized at any given time…
one in a billion
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at 10 °c, the ion product of water is 2.93 × 10^{-15}. what is the conc…
\(5.41\times 10^{-8}\text{ M}\)
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question a sample of carbon dioxide in water at room temperature has a …
\(1.3\times 10^{-7}\space M\) (the fourth option)
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question at 10°c, the ion product of water is 2.93×10^{-15}. what is th…
\(5.41\times 10^{-8}\text{ M}\)
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question at 100°c, the ion product of water is 5.13×10⁻¹³. what is the …
C. \(7.16\times 10^{-7}\text{ M}\)
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question all of the options below are base ionization reactions except …
\(H_2O+HNO_3 ightleftharpoons H_3O^++NO_3^-\) (the reaction \(H_2O+HNO_3 ightleftharpoons H_3O^++NO_3^-\) is the one that is not a base ionization reaction)
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question an aqueous acid ionization reaction always generates select th…
hydronium.
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question 1 - 10 pauline is curious to know if salt affects the freezing…
The independent variable (test variable) is the amount of salt added.
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give the molecular formula for the weak acid found in vinegar. it is co…
\(C_2H_4O_2\)
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question 1 - 9 scientists who study elements and how they interact are …
The structure and properties of elements like oxygen and iron
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question give the molecular formula of ammonia. • do not include state …
\(NH_3\)
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question citric acid is found in __________. select the correct answer …
None of the options provided are correct as citric acid is found in citrus fruits (not listed in the given options). If we assume there was a mistake in the options and we have to…
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question 1 - 7 pauline is curious to know if salt affects the freezing …
Container 1 should be labeled as the container with \(0g\) of salt added (or the control container with no salt).
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name: elemental 1 (metal - nonmeta) element 2 date: bond type o₂ cucl₂ …
| | Element 1 (metal - nonmetal) | Element 2 | Bond Type | |---|---|---|---| | \(O_2\) | Oxygen (non - metal) | Oxygen (non - metal) | Covalent | | \(CuCl_2\) | Copper (metal) | C…
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question citric acid is found in ________. select the correct answer be…
None of the options are correct as citric acid is found in citrus fruits (not listed in the given options). If forced to choose from the given options, there is no valid answer. B…
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question according to the bronsted-lowry definition, what is the conjug…
\(NH_3\) (i.e., the option with \(NH_3\) as its text)
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which of the following physical properties of sugar is demonstrated by …
solubility
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worksheet: chemical bonding - ionic vs covalent! remember... ionic bond…
| Compound | Element 1 (Metal or NonMetal) | Element 2 (Metal or NonMetal) | Bond Type | |---|---|---|---| | NaCl | Na = M | Cl = NM | ionic | | SO₂ | S = NM | O = NM | covalent |…
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question according to the bronsted - lowry definition, what acts as the…
A. \(H_2O\)
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which diagram represents a chemical reaction used to identify a mineral?
(1)
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what is the outcome variable (dependent variable) in this experiment? a…
The amount of water in the test tube.
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allen decided magnesium was the most effective at preventing rust, but …
Allen had more than one independent variable (both the type of nail and the coating material were changing).
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question give the formula of the strong acid that forms gastric juice f…
$HCl$
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how does the mass of the sodium metal and chlorine gas involved in the …
C. The mass of the sodium metal and chlorine gas combined is equal to the mass of the table salt that is produced.
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which of the following statements is not true of acids? select the corr…
have a bitter taste
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according to the bronsted-lowry definition, what acts as the acid when …
\(HSO_{4}^{-}\)
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which of the following statements is/are true of bases? select the corr…
all of the above
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dianne observes her science teacher testing a sample of an unknown subs…
4
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question 1 - 6 a student places a liquid in a jar and seals it. the liq…
The mass stayed the same.
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question 1 - 5 a chemist observes a reaction between two substances in …
The rate of the reaction would increase.
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question a conjugate acid is described by which of the following? selec…
A conjugate acid is the compound formed when a base gains a proton.
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question what is the name of khco₃? select the correct answer below: ○ …
potassium bicarbonate
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jeans mother lights a candle and places it on his birthday cake. as eve…
The wick burning.
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when wood burns, a small amount of ash is produced and gas is emitted. …
The mass of wood and oxygen needed for burning equals the mass of the ashes and the gas given off.
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given the reaction: magnesium + water - magnesium hydroxide + hydrogen …
100 degrees Celsius
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q40. black bins are used for hazardous pharmaceutical wastes non - haza…
Non - hazardous pharmaceutical wastes