化学
化学反应、化学计量、分子结构与元素性质。
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which elements are alkaline earth metals? check all that apply. berylli…
beryllium, magnesium
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these are all the same of, but they are different. (a.) has an atomic m…
These are all the same **isotopes** of **hydrogen**, but they are different **in mass number**. (A.) has an atomic mass of **1**. It has **1** Proton(s) and **0** Neutron(s). (B.)…
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explaining what makes a mixture heterogeneous or h ayala is making sala…
Es una mezcla homogénea porque el aceite y el vinagre se mezclan uniformemente en el licuadora, formando una consistencia uniforme.
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part e in which state of matter are the particles the most spread out?
Gases.
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19. the physical constants for ethanol are listed below. how much heat …
d) \(2.1\times 10^{5}\space J\)
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acetylene (c₂h₂) gas is often used in welding torches because of the ve…
\(0.500\space mol\)
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read the lines from act 1, scene v of romeo and juliet romeo: to juliet…
Romeo’s lines make up one quatrain, which uses an abab rhyme scheme.
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how many valence electrons are available for bonding in silicon? four f…
four
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which type of bond will form between two chlorine atoms? a nonpolar cov…
a nonpolar covalent bond
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pbf: benefits and limitations use the information below to answer the q…
The machines have a small build bed.
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fill in the blank question the small, positively charged center of the …
nucleus
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the ph scale is used to tell if a substance is an acid or base. substan…
base
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balance the chemical equation below using the smallest possible whole n…
\(2Ca_3(PO_4)_2(s)+6SiO_2(s)+10C(s)\to 6CaSiO_3(s)+P_4(s)+10CO(g)\)
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there are four different isotopes of iron. fe - 54 5.85% 53.9400 amu fe…
\(55.84\) amu
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there are four different isotopes of iron fe - 54 5.86% 53.9400 amu fe …
\(28,30,31,32\)
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there are four different isotopes of iron. fe - 54 5.85% 53.9400 amu fe…
26,26,26,26
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part b mass number for the titanium isotope with 24 neutrons express yo…
\(46\)
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atomic number for the titanium isotope with 24 neutrons express your an…
\(22\)
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in which situation are the individual molecules moving the fastest? a i…
D. In a cup of boiling water
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14 multiple choice 1 point science what is the number of protons in an …
7
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15 multiple choice 1 point science according to the kinetic molecular t…
The gas particles are separated by great distances relative to their size.
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missed this? read section 4.8. calculating atomic mass: read section 4.…
140.1 amu
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the astronaut then measures the abundance of magnesium on the new plane…
\(24.32\) amu
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why is the combustion of hydrocarbons important for modern society? (1 …
It releases energy that is used for power.
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what is the correct formula that would result from the combination of t…
\(Al_2(CO_3)_3\)
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we are reading a book about judy, a teacher who moves to a new place fo…
The part about Judy's mom scheming to get her married
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4 fill in the blank 1 point use the activity series of metals to decide…
reaction will occur
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what is the name of the ionic compound formed from these two components…
aluminum phosphate
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4. how many protons, electrons, and neutrons are in each of the followi…
a. Protons: 92, Electrons: 92, Neutrons: 143 b. Protons: 1, Electrons: 1, Neutrons: 2 c. Protons: 14, Electrons: 14, Neutrons: 15
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balance the chemical equation below using the smallest possible whole n…
\(1C_9H_{20}(l)+14O_2(g)\to9CO_2(g)+10H_2O(g)\)
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ammonium phosphate ((nh4)3 po4) is an important ingredient in many soli…
$0.30\space mol$
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question 9 (1 point) why does the boiling point of an alkane increase a…
d) The strength of the dispersion forces increases with increased molecular size.
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question 8 (1 point) which of these is an unsaturated hydrocarbon? ○ a)…
B. \(C_5H_{10}\)
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5) which two sentences are true? a. the average atomic mass will always…
# Explicación breve: La masa atómica promedio de un elemento químico se calcula como una media ponderada de las masas de sus isótopos, donde los pesos son las abundancias relativa…
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question 7 (1 point) alkyl halides are hydrocarbons that contain at lea…
B. 1,5 - dichloro - 2 - methylcyclohexane
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question 5 (1 point) use the following information to answer the next q…
e) heptane
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2nd element: magnesium 3) which isotope is more common? a) magnesium - …
# Explicación breve: El isótopo más común de magnesio es el magnesio - 24. Esto se debe a que la abundancia natural del magnesio - 24 es aproximadamente del 79 % (más alta que la …
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body paragraph 2: another common myth is that brown foods are better fo…
Give data on the chemicals used in junk food, Refer to a study that shows the benefits of certain types of brown food, Provide examples of brown foods that do have health benefits.
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question 3 (1 point) the structure below is ________. h h h h | | | | h…
E. pentane
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question 2 (1 point) the iupac name of compound ch₃c(ch₃)chch₃ is a) 1 …
B. 2 - methylbut - 2 - ene
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3. a solute can be a solid, a liquid or a gas * 4. the solubility of a …
3. False 4. D) None of the above 5. C) water
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1. what is a saturated solution? a saturated solution is a. * a) a solu…
1. A) A solution that cannot dissolve anymore solute 2. A) solute, solvent
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1. what is a saturated solution? a saturated solution is a. a) a soluti…
A) A solution that cannot dissolve anymore solute
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35. the process by which crystals form from a solution is called ______…
35. Crystallization 36. Crystal 37. Non - polar 38. Polar 39. Ionic 40. Precipitate
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35. the process by which crystals form from a solution is called ______…
41. B. Atoms transfer electrons 42. A. Electrons are shared between atoms 43. C. The smallest unit of a compound 44. D. Repeating 3D pattern of particles 45. E. Made of one type o…
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in problems 4 - 7, calculate ah for the reaction: 3 ch₄(g) → c₃h₈(g) + …
\(-40.72kJ/mol\)
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8. which of the following is not a compound? a. carbon dioxide (co₂) b.…
- 8. C. Nitrogen gas (\(N_2\)) - 9. B. A compound - 10. A. A solid with atoms arranged in a repeating pattern - 11. B. Crystal lattice - 12. B. Sugar - 13. B. They break and new o…
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this is the chemical formula for talc (the main ingredient in talcum po…
\(3.45\) mol
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question 10 (1 point) which organic compound is unsaturated? a) 4 - eth…
B. 2 - methyl - 3 - ethylpentyne
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this is the chemical formula for methyl tert - butyl ether (the clean -…
\(0.0059\) mol
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this is the chemical formula for nickel tetracarbonyl (a powerfully poi…
\(0.122\) mol
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question 8 (1 point) the iupac name of compound ch₃c(ch₃)chch₃ is a) 2 …
B. 3 - methylbut - 2 - ene
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consider the following diagram of a hypothetical reaction. which of the…
B. \(X_2 + 2Y ightarrow 2XY\)
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structural isomers are compounds that have ______ empirical molecular f…
d) the same different
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the sabatier reaction is used on space missions to remove carbon dioxid…
- Carbon dioxide \((CO_{2})\) has a sub - script of \(2\). - Hydrogen \((H_{2})\) has a coefficient of \(4\). - Methane \((CH_{4})\) has a sub - script of \(4\).
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structural isomers are compounds that have ______ empirical molecular f…
For the first question: d) the same, different For the second question: e) 2 - methylbut - 2 - ene
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copper wire reacts with a solution of silver nitrate to form solid silv…
| Substance | Classification | |--|--| | copper \((Cu)\) | reactant | | copper nitrate \((Cu(NO_{3})_{2})\) | product | | silver \((Ag)\) | product | | silver nitrate \((AgNO_{3})…
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question 6 (1 point) a carbon atom has _i_valence electrons and can for…
d) D
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in problems 4 - 7, calculate δh for the reaction: 3ch4(g)→c3h8(g)+2h2(g…
$\Delta H=-5649\space kJ$
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question 5 (1 point) name the following compound. a) 4 - methyl - 3 - p…
C. 4 - ethyl - 3 - methylheptane
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balance the chemical equation below using the smallest possible whole n…
\(P_{4}(s)+4NaOH(aq)+2H_{2}O(l)=2PH_{3}(g)+2Na_{2}HPO_{3}(aq)\)
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after eating certain foods, excess acid used to break down those foods …
- magnesium hydroxide \( (Mg(OH)_2) \): solid - hydrochloric acid \( (HCl) \): aqueous - water \( (H_2O) \): liquid - magnesium chloride \( (MgCl_2) \): aqueous
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question 4 (1 point) which compound is a constitutional isomer of the c…
B. pentane
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question 3 (1 point) an organic compound with the molecular formula c3h…
e) 2 - Bromopropane
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balance the chemical equation below using the smallest possible whole n…
\(2CH_3(CH_2)_6CH_3(g)+25O_2(g)\to16CO_2(g)+18H_2O(g)\)
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question 2 (1 point) the structure below is __________. h h h h | | | |…
e) butane
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the surface of iron slowly reacts with moisture and oxygen in the air t…
- Iron (\(\text{Fe}\)) has a **coefficient** of \(4\). - Oxygen (\(\text{O}_2\)) has a **subscript** of \(2\). - Iron(III) oxide (\(\text{Fe}_2\text{O}_3\)) has a **subscript** of…
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which of the following lewis dot structures for sulfur is correct?
B
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thermochemistry workshop in problems 1 - 3, calculate δh for the reacti…
$\Delta H=-88.2\ \text{kJ}$
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convert 153.2°c to kelvins. round your answer to the correct number of …
\(426.4\)
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surface. the yellow arrows show solar radiation and the red arrows show…
- Carbon dioxide: Absorbs IR radiation - Nitrogen: Does not absorb IR radiation - Water vapor: Absorbs IR radiation - Methane: Absorbs IR radiation
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which of the following lewis dot structures for iodine is correct?
C.
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which will increase the rate of a chemical reaction? adding a catalyst …
A. adding a catalyst
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question 39 1 point which schema should students develop early in colle…
D. each of these could be developed.
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which of the following lewis dot structures for iodine is correct?
B.
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which is the electron configuration for lithium? 1s² 2s³ 1s²2s¹ 1s¹2s²
\(1s^{2}2s^{1}\) (the third option)
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consider the model of the nitrogen atom. which electron configuration m…
\(1s^{2}2s^{2}2p^{3}\)
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two representations of the distribution of electrons in the potassium a…
Both models because each shows an electron in the outermost shell.
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consider the model of a sodium atom. which feature does the model show …
the distribution of electrons in different shells
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the first ionization energy, e, of a lithium atom is 0.860 aj. what is …
\(231\ \text{nm}\)
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which component is affected when a catalyst is added to a chemical reac…
the activation energy
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which diagram shows a pair of electrons that have opposite spins?
The first option (with $\uparrow\downarrow$ in the same box) shows a pair of electrons that have opposite spins.
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protons: 8 neutrons: 9 electrons: 10 what is the mass number?
\(17\)
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what is the mass number?
\(2\)
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question 9 (1 point) saved which compound is capable of hydrogen bondin…
d) \(CH_3OH\)
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question 10 (1 point) saved listen which of the following would be the …
C. \(CH_3CH_2CH_2CH_2CH_2CH_2NH_2\)
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the human eye is able to detect as little as $2.35\times10^{-18} \text{…
\(6\)
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question 2 (1 point) saved listen which of the following compounds woul…
\(CO_{2}\)
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question 1 (1 point) saved listen rank the following compounds in order…
\(CH_3CH_2CH_3<CH_3OCH_3 < CH_3CH_2OH\) (the last option in the given choices)
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question 10 (1 point) listen which of the following would be the least …
C. \(CH_3CH_2CH_2CH_2CH_2CH_2NH_2\)
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question 9 (1 point) which compound is capable of hydrogen bonding with…
d) \(CH_3OH\)
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question 8 (1 point) which compound would most likely experience only l…
e) \(CCl_4\)
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which statement is false? a) water molecules orient so their oxygen ato…
A. Water molecules orient so their oxygen atoms point toward an anion in solution.
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which solvent could involve ion - dipole interactions with na+ a) b) c)…
B.
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question 4 (1 point) for a molecule to exhibit dipole - dipole interact…
C. have a permanent dipole moment.
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which of the following molecules could form hydrogen bonds with an iden…
The first molecule (with the -OH group)
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consider the positions of barium (ba), sulfur (s), silicon (si), and ca…
barium
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which diagram shows electrons violating the pauli exclusion principle?
The third diagram (the one with \( \uparrow\downarrow\), \( \uparrow\uparrow\), \( \uparrow\uparrow\) in the boxes) shows electrons violating the Pauli exclusion principle.
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name reasoning about freedom of movement (continued) claim 2: molecules…
- This matters because: The evidence shows that as the phase of water changes (e.g., from ice to liquid water to water vapor), the movement of water molecules changes (e.g., from …
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name: date: reasoning about freedom of movement (continued) claim 3: mo…
- **This matters because**: The evidence shows that during a phase change (e.g., water changing phases), the molecules do not change into a new kind. It refutes the claim as phase…