化学
化学反应、化学计量、分子结构与元素性质。
-
20 multiple choice 2 points provide the proper iupac name for the alken…
hex-1-ene
-
18 multiple choice 2 points which of the following molecular formulas c…
C. \(C_3H_8O\)
-
multiple choice 2 points the carbon - carbon bond length in ethylene is…
B. shorter; larger than
-
13 multiple answer 2 points which of the following are commonly used to…
A. Dehydrohalogenation of alkyl halides, D. Dehydration of alcohols
-
12 true or false 2 points alkenes are more reactive than alkanes due to…
True
-
multiple choice 2 points which of the following alkenes can show geomet…
C. 3 - chloro - 2 - methyl - 1 - butene
-
multiple choice 2 points dehydrohalogenation of an alkyl halide by trea…
E. E2
-
multiple answer 2 points which conditions generally lead to the formati…
A. Applying Hoffmann’s rule, B. Using a bulky base
-
6 multiple choice 2 points by what mechanism does cyclohexanol react wh…
C. E1; cyclohexene
-
multiple choice 2 points provide the proper iupac name for the alkene s…
6-bromo-1-methylcyclohexene
-
3 true or false 2 points e1 elimination reactions involve a single tran…
B. False
-
multiple choice 2 points carbon - carbon single bonds tend to be ______…
A. longer; weaker
-
homework 7 answer all questions 1 multiple choice 2 points which reagen…
\(NaOH\)
-
what is the approximate value of avogadros number? a. 6.022 × 10²³ b. 6…
A. \(6.022\times10^{23}\)
-
utility operation and distribution use the information below to answer …
B. heating for homes and businesses
-
utility operation and distribution use the information below to answer …
to ensure the purity and safety of drinking water
-
utility operation and distribution use the information below to answer …
physical exertion and proficiency in engineering
-
what is the empirical formula of a compound with 20% hydrogen and 80% c…
A. \(H_{2}C\)
-
if a compound has an empirical formula of ch₂o and the ratio from molar…
a. \(C_2H_4O_2\)
-
in the given example, what is the empirical formula for a compound with…
B. $CH_{2}O$
-
what is the empirical formula for a compound with 70% iron (fe) and 30%…
B. \(Fe_{2}O_{3}\)
-
the following radial probability diagram could theoretically represent …
3p
-
if the n quantum number of an atomic orbital is 1, what are the possibl…
0
-
if the n quantum number of an atomic orbital is 1, what are the possibl…
\(0\) (i.e., the option with value \(0\))
-
a chemist prepares a solution of calcium sulfate (caso₄) by weighing ou…
\(1.9\times 10^{-4}\space g/dL\) (rounded to two significant digits as \(0.647\) has three significant digits and \(350\) has two significant digits, and we follow the rule of sig…
-
a biochemist carefully measures the molarity of ammonium chloride in 31…
\(8.7\ \mu M\)
-
measurements have shown that the concentration of salt in seawater is 3…
\(24.6\space L\) (rounded to three significant digits as \(875\) has three significant digits and \(35.5\) has three significant digits)
-
a chemist adds 425.0 ml of a 7.85 g/dl aluminum chloride (alcl₃) soluti…
\(33.4\space g\)
-
calculate the volume in liters of a 33.5 g/dl zinc nitrate solution tha…
\(0.134\ \text{L}\)
-
calculate the volume in liters of a 316. g/l zinc nitrate solution that…
\(1.31\space L\)
-
a chemist adds 0.26 l of a 0.358 g/l calcium sulfate (caso₄) solution t…
\(0.093\space g\)
-
a chemist prepares a solution of zinc oxalate (znc₂o₄) by weighing out …
\( 0.0168\ g/mL \)
-
the name of compound c is:
2 - bromo - 2 - methyl propyl methyl ketone
-
name the three alkenes using systematic names. a. the name of compound …
2 - methyl - 2 - butene
-
these important terms help you to understand how chemistry relates to b…
1. Matter - It is defined as anything that occupies space and has mass. 2. Elements - A substance that cannot be broken down into other substances by chemical reactions. 3. Atoms …
-
question 5 (mandatory) (2 points) a(n)_________ is a type of chemical b…
e) Ionic bond
-
question 3 (mandatory) (2 points) an atom that carries a charge is call…
A. Ion
-
question 4 (mandatory) (2 points) when atoms share electrons unequally,…
d) Polar covalent
-
question 2 (mandatory) (2 points) the nucleus of an atom contains______…
d) protons and neutrons
-
a precipitation reaction starts with a cloudy reagent true false contin…
False
-
4) what is the difference between baking soda and baking powder? why ar…
- Difference: Baking soda is $\ce{NaHCO3}$ (single compound), baking powder is a mixture of $\ce{NaHCO3}$, an acid, and starch. - Chemical Leaveners: Produce $\ce{CO2}$ via chemic…
-
what is necessary to plan and use when implementing a network? ip addre…
IP addressing scheme
-
when proof reading her own paper, jennifer swears she read \psychology …
1. insertion 2. the intensity of the word in their question
-
(sticks=bonds) from your model kit. a structural formula shows the kind…
Both water (\(H_2O\)) and hydrogen gas (\(H_2\)) are inorganic. Water is inorganic because it has no carbon atoms. Hydrogen gas is inorganic as it is composed of only hydrogen ato…
-
atomic dimensions fill in the blanks with the correct numbers and charg…
| ELEMENT | SYMBOL | ATOMIC NUMBER | MASS NUMBER | NUMBER OF PROTONS | NUMBER OF NEUTRONS | NUMBER OF ELECTRONS | CHARGE | |---|---|---|---|---|---|---|---| | Aluminum | Al | 13 |…
-
question 19 which of the following is a food safety responsibility of a…
Ensuring that separate fryers are available for preparing food for customers with allergies
-
description fsm1165 the food safety manager required quiz instructions …
When they are used incorrectly
-
this passage describes a chemical reaction. read the passage. then, fol…
- Carbon dioxide ($CO_2$): Product - Diphenyl oxalate ($C_{14}H_{10}O_4$): Reactant - Hydrogen peroxide ($H_2O_2$): Reactant - Phenol ($C_6H_6O$): Product
-
this passage describes a chemical reaction. read the passage. then, ans…
water ($\text{H}_2\text{O}$), carbon dioxide ($\text{CO}_2$)
-
use the references to access important values if needed for this questi…
\(6.81\space g\)
-
complete the following table: some polyatomic ions name chemical formul…
| name | chemical formula | |--|--| | ammonium cation | $\ce{NH4+}$ | | iodate anion | $\ce{IO3-}$ | | cyanide anion | $\ce{CN-}$ | | sulfate anion | $\ce{SO4^{2-}}$ |
-
read the sentences. the scientist used a chronometer to accurately trac…
D. instrument for measuring time
-
write the empirical formula of at least four binary ionic compounds tha…
\(CaCl_{2}\), \(CaO\), \(PbCl_{4}\), \(PbO_{2}\)
-
when the following equation is balanced properly under basic conditions…
The coefficient of \(Br_{2}\) is \(1\), coefficient of \(MnO_{2}\) is \(1\), coefficient of \(Br^{-}\) is \(2\), coefficient of \(MnO_{4}^{-}\) is \(1\) and electrons transferred …
-
unit 4 - part 2: mcq remember to log your answers onto my ap to earn fu…
A. \(Ag^{+}(aq)+Cl^{-}(aq)\to AgCl(s)\)
-
some people mistakenly believe that the element curium was discovered b…
D. nuclear chemist Glenn T. Seaborg
-
below is a set of boundary - surface representations of molecular orbit…
Top - left: B ($\sigma_{2p}^*$), Top - right: E ($\pi_{2p}^*$), Middle - left: C ($\sigma_{2s}$), Middle - right: D ($\sigma_{2p}$), Bottom - left: A ($\pi_{2p}$), Bottom - right:…
-
part 1 (1 point) see periodic table see hint physical properties such a…
- Ionic Bonding: \(CaCl_{2}\), \(KI\) - Dispersion Forces: \(Cl_{2}\), \(CH_{4}\) - Dipole - dipole Forces: \(PCl_{3}\) - Hydrogen Bonding: \(NH_{2}OH\)
-
words in context: get ready some historians believed that the nebra sky…
C. disproved
-
words in context: get ready ecologist nora underwood and colleagues hav…
A. deter
-
part 2 (1 point) pentane and hexane choose one or more: a. london dispe…
- Part 2: A. London dispersion - Part 3: A. London dispersion, B. dipole - dipole, C. hydrogen bonding
-
part 3 (1 point) cyclohexanol and water choose one or more: a. london d…
A. London dispersion, B. Dipole - dipole, C. Hydrogen bonding
-
part 1 (1 point) cyclohexanone and cyclohexanol choose one or more: a. …
- Part 1: A, B (if considering both substances' general intermolecular force presence; if more specific, cyclohexanone has A and B, cyclohexanol has A, B, and C) - Part 2: A
-
06 question (2 points) open ebook section 6.3 the two molecules depicte…
Molecule \(A(CICH_{2}CH_{2}Cl)<\) Molecule \(B(CHCl_{2}CH_{3})\)
-
when the bowl of cereal below was made, the cereal floated to the top w…
Density
-
exercise question 2 while heating two different samples of water at sea…
The percent error for the sample that boils at $102^{\circ}C$ is $2\%$ and for the sample that boils at $99.2^{\circ}C$ is $0.8\%$
-
try again your answer is incorrect. what are the molecular and empirica…
molecular formula: \(C_{4}H_{8}O_{2}\) empirical formula: \(C_{2}H_{4}O\)
-
fill in the systematic names of the following chemical compounds. note:…
- \(PCl_{3}\): phosphorus trichloride - \(Cl_{2}O_{7}\): dichlorine heptoxide - \(PCl_{5}\): phosphorus pentachloride - \(Cl_{2}O_{3}\): dichlorine trioxide - \(NH_{3}\): ammonia
-
fill in the systematic names of the following chemical compounds. note:…
- \(NF_3\): nitrogen trifluoride - \(N_2F_4\): dinitrogen tetrafluoride - \(P_4S_7\): tetraphosphorus heptasulfide - \(P_4S_3\): tetraphosphorus trisulfide - \(H_2O\): water
-
multiple - choice question these are called biogeochemical cycles becau…
the chemicals cycle through living and nonliving parts of the environment.
-
fill in the systematic names of the following chemical compounds. note:…
- \(CO\): carbon monoxide - \(CO_2\): carbon dioxide - \(NH_3\): ammonia
-
fill in the systematic names of the following chemical compounds. note:…
- \(N_2O_5\): dinitrogen pentoxide - \(N_2O\): dinitrogen monoxide (or nitrous oxide) - \(NO_2\): nitrogen dioxide - \(N_2O_4\): dinitrogen tetroxide - \(H_2O\): water
-
write the empirical formula of at least four binary ionic compounds tha…
\(FeI_{2}\), \(FeS\), \(AuI_{3}\), \(Au_{2}S_{3}\)
-
write the empirical formula of at least four binary ionic compounds tha…
\(ZnBr_{2}\), \(ZnO\), \(AlBr_{3}\), \(Al_{2}O_{3}\)
-
complete the following table: two polyatomic anions name chemical formu…
| name | chemical formula | | ---- | ---- | | chlorate anion | \( \text{ClO}_3^- \) | | bromite anion | \( \text{BrO}_2^- \) |
-
complete the following table: two polyatomic anions name\tchemical form…
| name | chemical formula | | ---- | ---- | | sulfate anion | \(SO_{4}^{2 - }\) | | nitrate anion | \(NO_{3}^{-}\) |
-
a nurse is caring for a client who is chemically impaired. which of the…
Engagement in care
-
a 1.82 mol sample of xenon gas occupies a volume of l at stp. stp (stan…
\(41.3\space L\)
-
a 1.27 - g sample of an unknown gas has a volume of 722 ml and a pressu…
\(60.8\space g/mol\)
-
a balloon holds 31.7 kg of helium. what is the volume of the balloon if…
\(193338.42L\)
-
a 9.44 l sample of gas has a pressure of 0.787 atm and a temperature of…
$0.527\ atm$
-
select the best answer. (selecciona la mejor respuesta.) 1. what does t…
La diferencia entre la energía potencial y la energía cinética es que la energía potencial es la energía almacenada en un objeto debido a su posición o configuración y la energía …
-
you weigh out 0.110g hypobromous acid into a 250ml volumetric flask. if…
C. 10.3 mL
-
in feso4, the oxidation number of s is a +6 b +2 c -2 d +4 continue que…
A. +6
-
each atom is assigned an oxidation number in a chemical species irrespe…
False
-
when nicl2 reacts with k2s, a precipitate of nis is generated b precipi…
A. precipitate of \(NiS\) is generated
-
an indicator goes through structural changes to indicate the difference…
True
-
which of the following is a true statement a cs2cro4 and bacro4 are bot…
D. \(Cs2CrO4\) is soluble in water while \(BaCrO4\) is a solid
-
naoh absorbs moisture from air very readily. hence, it can never be use…
A. primary standard
-
when nal and kcl are mixed a no precipitate is generated b a yellow pre…
A. no precipitate is generated
-
what volume of 18.0 m h₂so₄ is required to prepare 250.0 ml of 0.500 m …
\(6.94\space mL\)
-
question 1. when analyzing a primary source about texas history, what s…
B. The context in which the source was created
-
open-ended questions: answer the following questions in complete senten…
1. A mixture is a combination of substances with retained individual properties (e.g., salt water). A compound is a new substance from chemically - bonded elements (e.g., water fr…
-
4. which of the following is an example of a heterogeneous mixture? a) …
4. C. Oil mixed with water 5. B. Solute 6. B. Oil and water mixture 7. A. Homogeneous mixture 8. C. Oil 9. B. A substance made of two or more elements chemically combined 10. C. P…
-
1. which of the following is a pure substance? a) air b) salt (nacl) c)…
1. B. Salt (NaCl) 2. B. Carbon 3. B. Homogeneous mixture
-
select the correct answer. in this equation, what should be the coeffic…
A. the coefficient of iodine is 2, oxygen is 9, and the product is 2
-
select the correct answer. which of the following choices represents a …
B. \(2Ca_3(PO_4)_2 + 6SiO_2 \to P_4O_{10} + 6CaSiO_3\)
-
select the correct answer. is this equation balanced and in the lowest …
B. No, because the coefficients could be reduced to 2,1, and 3.
-
select the correct answer. methane burns in oxygen to produce carbon di…
A. \( \text{CH}_4+\text{O}_2 ightarrow\text{CO}_2+\text{H}_2\text{O} \)
-
select the correct answer. which equation obeys the law of conservation…
D. \(4\text{Fe} + 3\text{O}_2 \to 2\text{Fe}_2\text{O}_3\)