化学
化学反应、化学计量、分子结构与元素性质。
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18 question (8 points) in the blanks provided, write the name of each f…
A. Ether B. Ketone C. Alcohol D. Ester E. Aldehyde F. Alkyne G. Amine
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2. dé los nombres iupac para los siguientes compuestos: (a) ch3 ch3chch…
(a) 2 - metilpentano (b) 2,2 - dimetilbutano
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3. use dimensional analysis, convert 6.2 x 10^21 cl to zl. be sure to s…
\(6.2\times 10^{-42}\text{ ZL}\)
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summarize it! drag and drop the words or phrases that accurately comple…
solid, liquid, gas
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2. please do the following calculations and round your answer to the co…
a. $3.8\ g/mL$ b. $1.0\times10^{2}\ m^{2}$ c. $7.01\ mg$
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practice it! which of the following are properties of liquids? takes th…
takes the shape of its container, definite volume, able to move and flow
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1. determine the number of significant figures in the following numbers…
a. 2 significant figures b. 3 significant figures c. 4 significant figures d. 3 significant figures
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a researcher dispenses distilled deionized water from a 20 - ml transfe…
c. 20.167 d. 20.23
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four students made a graphic organizer describing the parts of the atom…
None of the given tables are correct. Proton: +, inside nucleus; Electron: -, outside nucleus; Neutron: 0, inside nucleus.
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drag and drop the words or phrases that accurately complete the paragra…
First blank: mass Second blank: volume Third blank: temperature Fourth blank: texture
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how does a catalyst influence a chemical reaction? it speeds up or slow…
It decreases the amount of energy necessary for the reaction to proceed.
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which reaction is exothermic? a reaction that absorbs energy from the e…
C. a reaction that releases energy into the environment
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a student has an unknown sample. how can spectroscopy be used to identi…
It can identify the elements in the sample.
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which component is affected when a catalyst is added to a chemical reac…
the activation energy
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06 question (1 point) which of the following compounds contain any ioni…
Compounds with a metal (like the one with Na) contain ionic bonds. Compounds made up of only non - metals (such as hydrocarbons, alcohols etc. among the given structures without m…
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select the word that means a horrible odor. the durian fruit of asia is…
stench
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read the passage. the stinky durian fruit the durian is an asian fruit …
Scientists found that a combination of different chemicals is responsible for the durian's powerful odor.
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
peel off the first glove
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
grasp the exterior of one glove with a gloved hand
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what is an impact of farmers using chemicals to replace nutrients in th…
D. Chemicals in the soil can pollute the water system.
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multiple - choice question vertical columns are called groups periods r…
groups
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the average atomic mass of boron is 10.81 amu. based on the atomic mass…
D. 10.009 amu
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what is the oxidation state of nitrogen in n₂? a. +3 b. -3 c. 0 d. +5
C. 0
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what is the horizontal rows on the periodic table called? group period …
B. Period
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how are all atoms similar? a. they are made up of the same types of par…
A. They are made up of the same types of particles.
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which reaction occurs at the anode in an electrochemical cell? a. zn(s)…
D. $Zn(s) ightarrow Zn^{2 + }(aq)+2e^{-}$
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question 26 of 30 what mass of methanol (ch3oh) is produced when 86.04 …
D. 96.12 g
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multiple - choice question what does the 6 represent atomic mass (the a…
Atomic Number (the number of protons in the atom)
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which statement best describes the science of chemistry? a. chemistry i…
D. Chemistry is mainly the study of the composition of and changes in matter.
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quiz: pre - lab quiz - using excel for graphing points possible: 1.00 o…
A. When everyone in the room is done handling any chemicals or glassware
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multiple - choice question what does the c represent
Chemical Symbol
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multiple - choice question the zig zag is made of metalloids metals non…
metalloids
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what is the percent yield for the reaction below when 364 g so2 and 42.…
# Explanation: ## Step1: Calculate moles of reactants Molar mass of $SO_2$ is $64.07\ g/mol$, so moles of $SO_2=\frac{364\ g}{64.07\ g/mol}\approx 5.68\ mol$. Molar mass of $O_2$ …
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4. describe the difference between the arrangement of atoms in solids, …
4. Solids: closely - packed, regular pattern, little movement; Liquids: close together, can move past one another; Gases: far apart, move freely. 5. a. In the gas state, atoms mov…
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question 22 of 30 which reaction occurs at the cathode of a galvanic ce…
A. $Zn^{2+}(aq)+2e^-\to Zn(s)$
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18 multiple - choice question non metals are located to the right of th…
to the right of the zigzag
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which is the balanced version of the half - reaction below? h2s → s + h…
A. $H_2S ightarrow S + 2H^+ + 2e^-$
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where does oxidation occur in an electrochemical cell? a. cathode b. an…
B. Anode
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what is the oxidation state of p in ca3(po4)2? a. +5 b. +3 c. -5 d. -3
A. +5
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question 18 of 30 why do scientists use models of molecules? a. to show…
A. To show the structure of molecules, which are too small to see
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multiple - choice question most elements are metals non - metals
Metals
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what is oxidized in the reaction below? h2 + cl2 → 2hcl a. h2 b. cl2 c.…
A. $H_2$
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question 16 of 30 how are elements with similar properties grouped in t…
A. In the same column
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question 15 of 30 the theoretical yield of ammonia in a reaction is 865…
B. 76.0%
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question 14 of 30 what is the cell potential of an electrochemical cell…
D. 1.24 V
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question 13 of 30 the half - reaction at the anode in an electrochemica…
A. $Ni^{2+}(aq)+2e^{-}\to Ni(s)$
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multiple - choice question how did mendeleev arrange his elements? incr…
Increasing atomic mass
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question 12 of 30 why are the oxidation and reduction half - reactions …
D. So that electricity will flow through the wire connecting the halves of the cell
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practice: determining formulas part 1: determine the empirical formula …
1. $MgBr_{2}$ 2. $CH_{4}$ 3. $Na_{2}SO_{4}$ 4. $AlPO_{4}$ 5. $AgNO_{3}$ 6. $AgNO_{3}$ 7. $C_{6}H_{6}$
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13 multiple - choice question who is the father of the periodic table? …
B. Mendeleev
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question 11 of 30 what is added to balance hydrogen and oxygen atoms in…
A. $\text{OH}^-$ and $\text{H}_2\text{O}$
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question 10 of 30 the reaction of hydrogen with nitrogen to produce amm…
D. 4
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2. dó los nombres iupac para los siguientes alcanos y convierta cada re…
No se puede determinar sin una imagen más clara.
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question 9 of 30 what happens to elemental copper when it loses two ele…
C. It is oxidized to $Cu^{2+}$
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2. de los nombres iupac para los siguientes alcanos y convierta cada re…
# Explicación: ## Paso 1: Identificar la cadena principal En un alcano, la cadena principal es la más larga. Debemos contar los átomos de carbono en la cadena más larga. ## Paso 2…
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question 8 of 30 what is the balanced equation for the redox reaction b…
D. $Ag + 2H^+ + NO_3^- ightarrow NO_2 + Ag^+ + H_2O$
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question 7 of 30 which of the following processes involves an oxidation…
D. Electroplating
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question 6 of 30 the average atomic mass of carbon is 12.01 amu. based …
D. There is a very large percentage of C - 12.
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question 5 of 30 which redox reaction would most likely occur if zinc a…
A. $\mathrm{Cu^{2 +}+Zn ightarrow Cu + Zn^{2+}}$
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question 4 of 30 what is the source of the ions involved in a redox rea…
A. Electrolyte solutions
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which would most likely be reduced when combined with cu(s)? click for …
C. $Au^{+}$
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question 2 of 30 which term describes the total voltage of a redox reac…
C. Negative
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question which functional group is not present in this molecule? answer…
C. Sulfhydryl
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question 1 of 30 which of the following is most easily reduced? click f…
A. $Ag^+$
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choose the term that correctly describes the relationship between these…
Structural isomers
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estructuras electrón - punto y enlace - línea. 1. ¿cuáles son las fórmu…
(a) $NH_{2}OH$ (b) $AlCl_{3}$ (c) $CF_{2}Cl_{2}$ (d) $CH_{2}O$ 2. No es posible satisfacer las valencias de los átomos de una manera químicamente estable.
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visualización de la química 1. convierta cada uno de los siguientes mod…
# Explicación: ## Paso 1: Analizar el modelo de la conina (a) Contamos los átomos de carbono (gris), hidrógeno (marfil), nitrógeno (azul). Cada átomo de carbono forma 4 enlaces, h…
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during osmosis, water moves down its own concentration gradient. how is…
When more solutes are dissolved in solvents, the concentration of the solute increases, but per unit volume, the concentration of the solvent decreases.
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practice it! sentoria wants to do her science project on calories in fo…
independent
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bonus that are ______, which results in this part of the molecule being…
B. hydrogen; carbon; nonpolar; hydrophobic
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practice it! sentoria wants to do her science project on calories in fo…
Sentoria is doing an experiment on calories of different foods. She uses the scientific method to organize the experiment. In this experiment, the outcome variable is the number o…
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4. how might waters polarity affect the way water molecules arrange the…
Water's polarity leads to hydrogen bonding. In liquid water, hydrogen bonds are transient, and molecules move freely. During freezing, hydrogen bonds cause water molecules to form…
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question 28 of 30 what is the product of the unbalanced combustion reac…
B. $CO_2(g)+H_2O(g)$
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question 27 of 30 which of the following describes the reactants of a c…
C. The original substances
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question 26 of 30 what type of reaction is shown below? sr(s) + cl2(l) …
B. Synthesis
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question 25 of 30 why are chemical equations balanced? a. to show that …
A. To show that the total number and type of each atom does not change
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use the figures to answer the following question. which molecule shown …
B.
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question 24 of 30 how many carbon atoms are represented by the model be…
D. 2
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freezing liquid you may have noticed that ice floats in water, while mo…
The water molecules in ice are arranged in a more open, less - closely - packed structure compared to liquid water.
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question 23 of 30 what is the balanced form of the chemical equation sh…
A. $Ca(OH)_2(aq)+Na_2CO_3(aq) ightarrow CaCO_3(s)+2NaOH(aq)$
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question 22 of 30 what is the reactant(s) in the chemical equation belo…
C. $2Al(s)+2NaOH(aq)+2H_2O(l)$
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use the schemes to answer the question. a. -oh c. -nh₂ b. o || -c -o-h …
A. -OH
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the molecular structures of linoleic acid and palmitic acid, two natura…
C. Palmitic acid, because the absence of carbon - carbon double bonds allows the molecules to pack closely together.
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question 21 of 30 what is the product(s) of the reaction below? 2al(s) …
B. Solid aluminum oxide and solid iron
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question 20 of 30 what is the balanced form of the chemical equation sh…
A. \(4Al(s)+3O_2(g) ightarrow2Al_2O_3(s)\)
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question 19 of 30 what is the product of the unbalanced equation below?…
B. $AlBr_3(s)$
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question 17 of 30 what type of change causes atoms to be rearranged? a.…
A. A chemical change
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question 16 of 30 when a substance is added to water, bubbles form. how…
A. Determining that the gas produced in the reaction was different from the original substance would confirm that a chemical change took place.
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question 15 of 30 values for the molar mass of hydrogen, chlorine, and …
A. 72.92 g
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question 14 of 30 what is the mass of 5 moles of helium (he) atoms? the…
D. 20 g
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question 13 of 30 which general equation shows a single - displacement …
C. A + BX → AX + B
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question 12 of 30 which is most likely to happen during a double - disp…
D. The ions in two compounds will switch places to form two new compounds.
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question 11 of 30 what is the balanced form of the chemical equation sh…
C. $C_6H_{12}O_6(s)+6O_2(g) ightarrow 6H_2O(l)+6CO_2(g)$
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question 9 of 30 a structural model of adrenaline is shown below. how m…
D. 16
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question 8 of 30 what is the mass of 2.25 moles of manganese(iv) sulfid…
D. 268 g
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question 7 of 30 a balloon contains 7.36 g of oxygen gas (o₂). how many…
A. $1.38\times 10^{23}$ molecules
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question 6 of 30 what is the molarity of 820 ml of ki solution that con…
D. 0.27 mol/L
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question 5 of 30 how does the number of products in a synthesis reactio…
C. The number of products is less than the number of reactants.
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question 4 of 30 which of the following is an example of a chemical cha…
D. Sugar breaking down into water and carbon when it is heated
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question 3 of 30 if a reaction occurs, what will be the products of the…
D. No reaction will occur.