Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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what product can bemeasured with bromothymol blue? h₂o h₂o₂ co₂ o₂
C. $CO_2$
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multiple - choice question what happens after the bonds are broken due …
the molecules can flow past each other and liquid water forms
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how does bromothymol blue serve as an indicator in the experiment? it m…
It measures the rate of CO₂ production.
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what role did the resting rate play in the bromothymol blue experiment?…
C. a control
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multiple - choice question the water molecules in ice are bonded tightl…
B. crystal lattice and the molecules vibrate
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what color does bromothymol blue change to in the presence of co₂? oran…
orangish - yellow
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highlight the main group metals in the periodic table below.
Li, Na, K, Rb, Cs, Fr, Be, Mg, Ca, Sr, Ba, Ra, Al, Ga, In, Tl
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assignment multiple - choice question is water and ice made of the same…
yes both contain the same water molecules
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assignment multiple - choice question which is correct? the solid form …
the solid form of water is ICE
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when an atom or molecule gains one or more electrons, it is said to be:…
A. reduced
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13. what is the difference between cohesion and adhesion? cohesion is _…
Cohesion is the attraction between molecules of the same substance. Adhesion is the attraction between molecules of different substances.
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a calorie is the commonly used unit of chemical energy. it is also the …
D. heat
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5) a flask that weighs 343.8 g is filled with 225 ml of carbon tetrachl…
5) $ ho\approx1.581\ g/mL$ 6) $ ho\approx1.84\ g/mL$ 7) $m = 219.125\ g$ 8) $ ho\approx11.3\ g/cm^{3}$ 9) $ ho\approx7.92\ g/mL$ 10) $V\approx238.1\ cm^{3}$
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if you were able to increase the kinetic energy of the molecules inside…
It would increase
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1.) how many significant digits are in the measurement 0.005030 g? (1 p…
B. 4
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the textile industry manufactures fabric. the industrys production meth…
C. hazardous
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1) a block of aluminum occupies a volume of 15.0 ml and weighs 40.5 g. …
1. $2.7\ g/mL$ 2. $13.6\ g/mL$ 3. $157.8\ g$ 4. $\approx8.92\ g/cm^{3}$
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how to calculate volume of concentrated solution needed to prepare a di…
$5.0\ mL$
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1) how many milliliters of the approximately 0.11 m prepared copper(ii)…
$10.00$
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energetically favorable reactions rank these reactions from least to mo…
1. Glucose to Glucose - 6 - P 2. Glucose - 6 - P to Fructose - 6 - P 3. ATP to ADP and Pi 4. PEP to pyruvate
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15) how do non - metal elements become more stable and form compounds? …
15. sharing valence electrons 16. transferring inner energy level electrons to an outer level to form stable bonds
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2. types of environment 3. ocean currents ch.- 16 state government ♦ fi…
1. **Fill - in - the blanks**: - 28; 8 - Central or Union Government - 25 - Question Hour - Governor 2. **One - word answers**: - Member of Legislative Assembly - 30 - 6 years - A…
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13) which electron configuration is of an unreactive element? ne3s2 xe6…
13. [Kr]5s2 4d10 5p6 14. hydrogen
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30 multiple choice 2 points which of the following types of hydrocarbon…
C. alkanes
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match the word to the correct definition. then write one sentence using…
1. Definition: A chemical bond formed by the transfer of electrons between atoms, creating ions that attract each other. Sentence: Sodium and chlorine form an ionic bond to create…
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10) which noble gas does not follow the octet rule? argon helium krypto…
10. B. Helium 11. D. 8
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the image shows a building with large plexiglass windows and a lewis st…
carbon = trigonal planar, oxygen = bent
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29 multiple choice 2 points which of the statements below accurately de…
A. Alkanes are the simplest and least reactive class of organic compounds., D. Alkanes are hydrocarbons which contain only single bonds.
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scientific inquiry. select the part of the passage that describes testi…
She prepared a saline solution by mixing salt into water. She then poured equal amounts of the solution into four separate cups. Next, she placed an iron nail in two of the cups a…
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the image shows polyurethane insulation being sprayed into a wall cavit…
120°
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multiple choice 2 points identify the correct iupac name for the struct…
B. 1 - bromo - 4 - tert - butyl - 5 - chlorocycloheptane
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8) how many valence electrons do the alkaline earth metals have? 2 4 6 …
8) 2 9) arsenic
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the image shows a space satellite and the lewis structure of the monopr…
trigonal pyramidal
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catalytic cracking is the reaction process through which long - chain a…
A. True
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the image shows a disassembled smartphone and the lewis structure of th…
trigonal planar
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cis - trans isomers not isomers structural isomers conformational isome…
D. conformational isomers
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the image shows a lewis structure for an octane component of gasoline, …
- 109°
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6) how many valence electrons would be shown in the electron diagram of…
6) B. 3 7) B. It stays the same
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multiple choice 2 points a series of compounds, like the n - alkanes, t…
D. homologous
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the image shows a skeletal structure for a nanometer - sized molecular …
-109°
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4) an atom of a certain element has the electron configuration of ar4s2…
4) A. 7 5) B. Br
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the image shows a lewis structure for a dimethylhydrazine, and a space …
A - 109° and B - 109°
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24 multiple choice 2 points provide an acceptable iupac name for the al…
C. 2,5 - dimethylheptane
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11 the work of robert boyle paved the way for scientists to work on che…
True
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the image shows a lewis structure for vinyl chloride, which is used to …
trigonal planar
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23 multiple choice 2 points which of the following correctly lists the …
chair < twist boat < boat < half - chair, so the correct option is the third one: chair < twist boat < half - chair < boat.
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5) what is the element described in question #4? cl br se zn 6) how man…
6) 3
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the image shows an exotic automobile made with extensive use of carbon …
carbon 1 = trigonal planar, carbon 2 = linear
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kate is a student in the lab and needs to measure the amount of water i…
This measurement contains uncertainty. The 8 in 44.8 is the uncertain digit.
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which line angle drawing best represents the newman projection shown be…
The correct line - angle drawing needs to be determined by analyzing the groups attached to the two - carbon bond in the Newman projection. In the given Newman projection, one car…
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the image shows a power plant and a lewis structure of the chemical eth…
(I) tetrahedral electron domain geometry, (II) bent molecular geometry
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3) which of the following statements are not true about electron dot di…
3. They include all electrons in an atom 4. 7
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multiple choice 2 points which of the following cycloalkanes exhibits t…
A. cyclooctane
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3) which of the following statements are not true about electron dot di…
3) They include all electrons in an atom 4) 7
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20 multiple choice 2 points provide the name of the compound below. sec…
A. sec - butylcyclohexane
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1) how many valence electrons are in group 2 elements? 1 2 4 8 2) how m…
1) B. 2 2) B. 7
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19 true or false 2 points conformations are different arrangements of t…
True
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5) which of the following elements has the largest atomic radius? 1 poi…
Fr
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which line - angle formula corresponds to the chair conformation shown …
A. II
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3) why does he have a smaller atomic radius than h? h has more hydrogen…
3. He has 2 positively charged protons in the nucleus pulling the negatively charged electrons closer. 4. F
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17 multiple choice 2 points name the alkane shown: 5 - methyl - 2,2 - d…
C. 5 - ethyl - 2,2 - dimethyloctane
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1) which of the following elements has the largest atomic radius? li be…
1) C. Na 2) B. Cd
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16 multiple choice 2 points provide an acceptable name for the alkane s…
A. 3 - ethyl - 5 - methyl - 7 - propylnonane
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4 what line of thinking rejected alchemy? chemicals are basic building …
Chemicals are basic building blocks.
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true or false 2 points the appropriate iupac name of the compound below…
False
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1) how many grams of copper(ii) sulfate pentahydrate (cuso₄·5 h₂o) are …
$2.75$
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arrange the following newman projections of butane in order of energy. …
III<I<IV<II
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13 multiple choice 2 points provide an acceptable name for the alkane s…
D. hexane
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12 multiple choice 2 points provide an acceptable name for (ch₃ch₂ch₂)₃…
C. 2,2 - dipropylheptane
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what is the major constituent of natural gas? propane ethane methane bu…
C. methane
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10 multiple choice 2 points which of the following condensed formulas r…
A. CH₃CH₂CH₂OCH₂N(CH₂CH₃)₂
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multiple choice 2 points the energy barrier for carbon - carbon bond ro…
B. torsion strain
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multiple choice 2 points a branched alkane has ______ boiling point rel…
D. a lower; weaker
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7 multiple choice 2 points which of the following describes the compoun…
C. bridged bicyclic
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multiple choice 2 points in the lowest energy conformation of the compo…
3
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5 multiple choice 2 points which has the greatest molar heat of combust…
cycloheptane
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how many carbons do the primary alkane constituents of gasoline contain…
C₅ - C₈
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multiple choice 2 points triacontane is an unbranched alkane that conta…
A. 62
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2 multiple choice 2 points how many secondary (2°) carbons are found in…
3
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the name of the structure below is 4 - isobutylheptane: true false
False
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heat is a form of ______ energy, because it reflects the random motion …
C. kinetic
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the process of influencing chemical bonds to lower the activation energ…
D. catalysis
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which of the following describe how energy is used in chemical reaction…
All of the above statements can describe how energy is used in chemical reactions. However, if we must choose one, the most comprehensive and accurate one among the given options …
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fill in the blank question heat is a measure of the random of molecules…
kinetic energy
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any agent that speeds up the rate of a chemical reaction without being …
catalyst
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fill in the blank question stored in the chemical bonds of a molecule c…
Chemical energy
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what are the independent and dependent variables in this experiment? pr…
Independent variable: Mangrove Tree Height Dependent variable: Proportion Soil Organic Carbon
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heat is a form of ______ energy, because it reflects the random motion …
C. kinetic
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multiple choice question which of the following describe how energy is …
Energy stored in certain chemical bonds is transformed into kinetic energy which breaks those bonds (as atoms move quickly apart); Energy stored in certain chemical bonds can be u…
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13. normal body temperature is 37.0 °c. what is the corresponding fahre…
$98.6^{\circ}F$ ### 14.
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question 20 1 pts which of the following molecules has hydrogen bonding…
B. None, all of the choices exhibit dispersion forces
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iron express your answer in complete form, in order of increasing orbit…
$1s^22s^22p^63s^23p^64s^23d^6$
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question 51 points 3 which of the following statements is true? i. the …
I and II
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which intermolecular forces are present for a molecule with the formula…
For $NH_3$: dispersion forces, hydrogen bonding, dipole - dipole forces For $SO_2$: dipole - dipole forces, dispersion forces
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which intermolecular forces are present for a molecule with the formula…
For $NF_3$: - dipole - dipole forces - dispersion forces For $BF_3$: - dispersion forces
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choose the substance with the lowest boiling point. o h₂o₂ o cf₂h₂ o nb…
First question: $\mathrm{F_2}$ Second question: The straight - chain alkane with 5 carbon atoms (the second structure in the second question)
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choose the substance with the lowest boiling point. ○ h₂o₂ ○ cf₂h₂ ○ nb…
F₂
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arsenic express your answer in complete form, in order of increasing or…
1s^22s^22p^63s^23p^64s^23d^104p^3
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place the following substances in order of increasing boiling point. ch…
D. $CH_3CH_2CH_3 < CH_3OCH_3 < CH_3CH_2OH$
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how many molecules are in 2.5 mol of nacl? 1.5 molecules 1.5 x 10^24 mo…
B. $1.5\times 10^{24}$ molecules