Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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select all that apply which of these are characteristics of typical ion…
crystalline, solid at room temperature, high melting point
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fill in the blank question a negatively charged ion is known as a(n) ne…
anion
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multiple choice question a positively charged ion is known as a(n) cati…
A. cation
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multiple choice question the force of attraction between the opposite c…
ionic
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multiple choice question chemical bonding occurs because o atoms are mo…
atoms share, gain, or lose electrons to become more stable, and an attraction forms between them
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multiple choice question ionic compounds have a neutral charge because …
cancel each other
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multiple choice question a charged particle that has either more or few…
ion
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select all that apply which statements about the formation of potassium…
- Each potassium atom forms an ion, \(K^{+}\). - Each potassium atom loses an electron. - Potassium iodide has a neutral charge.
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fill in the blank question in water, the hydrogen and oxygen atoms elec…
share
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multiple choice question a negatively charged ion is known as a(n) ____…
B. anion
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select all that apply choose the options that correctly complete this s…
- each sodium atom loses an electron - sodium achieves a stable outer energy level similar to a noble gas - neutral sodium atoms (\(Na\)) become sodium ions (\(Na^+\)) - chlorine …
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how many grams of water when supplied with 391 j of heat will gain a te…
18 g
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fill in the blank question a positively charged ion is known as a(n)
cation
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multiple choice question when atoms gain, lose, or share electrons, an …
chemical
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fill in the blank question chemical bonding occurs because atoms gain, …
lose, stable, chemical bond
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fill in the blank question a(n) is a charged particle that has either m…
ion
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fill in the blank question an electron dot diagram for an atom of sulfu…
\(6\)
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5. what turns the turbines in a hydroelectric power plant? a. wind b. h…
5. c. Moving water 6. d. Coal 7. b. Organic materials like plants and manure 8. c. Methane 9. b. The wind does not always blow 10. b. Iceland
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fill in the blank question when sodium and chlorine combine to form a c…
loses; gains
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what is not true about shakespearean sonnets? choose one option a they …
C. They have no specific meter.
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fill in the blank question a(n) is the force that holds atoms together …
chemical bond
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fill in the blank question a(n) is the force that holds atoms together …
chemical bond
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select all that apply which statements about the chemical stability of …
Sulfur is stable when its outer energy level has eight electrons. Hydrogen is stable when its outer energy level has two electrons. Group 17 elements are stable when their outer e…
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1. what are fossil fuels primarily composed of? a. nitrogen and oxygen …
1. B. Carbon and hydrogen 2. B. Peat
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multiple choice question chemical bonding occurs because ________. atom…
atoms share, gain, or lose electrons to become more stable, and an attraction forms between them
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multiple choice question atoms with unstable outer energy levels can lo…
atoms with partially complete outer energy levels
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fill in the blank question in water, the hydrogen and oxygen atoms blan…
share
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select all that apply which statements about hydrogen and helium are tr…
- Helium contains two electrons in its lone energy level. - The outer energy level of hydrogen is not full. - Hydrogen contains one electron in its lone energy level.
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multiple select question select all that apply choose the options that …
neutral sodium atoms (Na) become sodium ions (\(Na^{+}\)), sodium achieves a stable outer energy level similar to a noble gas, chlorine achieves a stable outer energy level simila…
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multiple select question select all that apply choose the options that …
neutral sodium atoms (Na) become sodium ions (\(Na^{+}\)), sodium achieves a stable outer energy level similar to a noble gas, chlorine achieves a stable outer energy level simila…
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multiple choice question the noble gases are stable because they o each…
each have a full outer energy level
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a limericks rhyme scheme is choose one option a abab b aabba c abcde d …
B. AABBA
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multiple choice question the outer energy level of oxygen is stable wit…
8
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fill in the blank question atoms with unstable outer energy levels can …
lose, gain, share
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when a poem does not have a specific rhyme, rhythm, meter and/or length…
D. none of the above
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rhyme scheme, length and subject matter. two poetic forms are limericks…
A. the ways in which they rhyme
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read this excerpt from walt whitmans o captain! my captain! my captain …
B. AABB
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select all that apply select all of the possible examples to show a che…
bubbles form, burning, unexpected color change, unexpected temperature change
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question 4 identify the following as either chemical or physical abilit…
chemical property
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identify the following as either chemical or physical a yellow rock phy…
physical property
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identify the following as either chemical or physical burning wood chem…
chemical change
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question 1 identify the following as either chemical or physical meltin…
physical change
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the drawing below shows a mixture of molecules: key carbon hydrogen nit…
Of which reactant are there the most initial moles? Enter its chemical formula: \(O_2\) Of which reactant are there the least initial moles? Enter its chemical formula: \(NH_3\) W…
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particles in each state of matter behave differently because they have …
- "Particles in a solid have thermal energy." - "Particles in a solid are packed tightly."
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decide whether these proposed lewis structures are reasonable. proposed…
- For \(H - C\equiv N\): Yes. - For \(:O - C - O:\): No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: C. …
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the chemical energy in your food is transformed into what type of energ…
mechanical
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hydrogen fuel cells are a type of alternative energy. these cells are e…
water
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6.7: homework assignment score: 9.5/10 answered: 9/10 progress saved qu…
The initial mass is \(384\) mg. The mass 7 weeks after the start is approximately \(0.0788\) mg.
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licl(s) electrostatic attraction ccl₄(s) electron cloud an ionic covale…
Among \(Ar(s)\), \(CCl_{4}(s)\), \(LiCl(s)\), and \(CH_{3}OH(s)\), \(LiCl(s)\) will have the highest melting point because it is an ionic compound that tends to have strong electr…
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missed this? read section 12.7. you can click on the review link to acc…
- Molecular: $\ce{CO2(s)}$, $\ce{I2(s)}$ - Ionic: $\ce{CaCl2(s)}$ - Atomic: $\ce{Ni(s)}$
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missed this? read section 12.7 you can click on the review link to acce…
- Molecular: $\ce{CO2(s)}$, $\ce{I2(s)}$ - Ionic: $\ce{CaCl2(s)}$ - Atomic: $\ce{Ni(s)}$
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missed this? read section 12.7. you can click on the review link to acc…
- Molecular: $\ce{CO2(s)}$, $\ce{I2(s)}$ - Ionic: $\ce{CaCl2(s)}$ - Atomic: $\ce{Ni(s)}$
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part a determine whether a homogeneous solution forms when each pair of…
\(CH_3CH_2CH_2CH_2CH_3\) and \(CH_3CH_2CH_2CH_2CH_2CH_3\)
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match the items in the left column to the appropriate blanks in the sen…
The substance \(CH_3CH_2OH\) will be a liquid at room temperature because it has hydrogen bonding, dipole - dipole, and dispersion intermolecular force(s), while \(CH_3OCH_3\) wil…
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which noble gas has the highest boiling point? why? match the items in …
The only intermolecular force present in noble gases is the dispersion force, which increases with increasing molar mass. Hence, Rn will have the highest boiling point.
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missed this? watch iwe: determining whether a molecule is polar. read s…
Polar: \( \text{CH}_3\text{OH} \), \( \text{CH}_2\text{Cl}_2 \), \( \text{H}_2\text{CO} \) Non - polar: \( \text{CO}_2 \)
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missed this? watch me determining whether a molecule is polar read sect…
- Polar: \(NO\), \(HCl\) - Nonpolar: \(N_2\), \(I_2\)
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determine the electron geometry of ( h_2o_2 ) (skeletal structure hooh)…
For electron geometry: tetrahedral. For molecular geometry: bent. But if we consider the given options strictly (assuming no error in the question's option set for the second part…
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name the compound shown below. h₂s dihydrogen sulfide
Hydrogen sulfide
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determine the molecular geometry of h₃coch₃ (skeletal structure h₃coch₃…
tetrahedral
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6.7: homework assignment score: 2.5/10 answered: 2/10 question 3 the ha…
The initial mass is \(112\) mg. The mass 5 weeks after the start is approximately \(0.1543\) mg.
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determine the electron geometry of $\\ce{h_{3}coch_{3}}$ (skeletal stru…
Electron geometry: tetrahedral Molecular geometry: tetrahedral
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part a determine the electron geometry of ch₃oh (skeletal structure h₃c…
Part A: tetrahedral Part B: tetrahedral
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determine the number of electron groups around the central atom for eac…
\(4\)
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determine the number of electron groups around the central atom for eac…
\(4\)
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name the compound shown below. so₃
Sulfur trioxide
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name the compound shown below. p₂o₅
Diphosphorus pentoxide
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which of the following contains chemoreceptors? multiple choice medulla…
Medulla oblongata
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which of the following is not detected by chemoreceptors in the carotid…
Blood pressure
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select all the elementary substances. bromine (br₂) nickel (ni) hydroge…
All the given substances (bromine (\(Br_2\)), nickel (\(Ni\)), hydrogen (\(H_2\)), copper (\(Cu\))) are elementary substances.
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krypton is one of the rarest gases found in earths atmosphere. the chem…
an elementary substance
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carbon monoxide is a poisonous gas that is produced by volcanic eruptio…
a compound
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iodine is found in some types of disinfectants. the chemical formula fo…
an elementary substance
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sodium fluoride is used in toothpaste to help prevent cavities. the che…
B. a compound
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2-chloroethanol is a poisonous substance used to make chemicals that ki…
a compound
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question 6 lead(ii) oxide can be reduced to form elemental lead through…
\(107.5\) ### Question 7
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question 4 use the standard thermodynamic properties table to calculate…
Question 4: $-24.8$ Question 5: $-351.3$
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question 3 the heat of formation at 25°c of liquid acetone, ch₃c(o)ch₃(…
E. $3\ C(s,\ graphite)+3\ H_2(g)+\frac{1}{2}\ O_2(g)\to CH_3C(O)CH_3(l)\ \ \ \Delta H_f^\circ=-247.5\ \frac{kJ}{mol}$
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discuss why the reaction between the hydrogen gas and the oxygen gas is…
- **Word equation**: Hydrogen + Oxygen → Water - **Balanced symbol equation**: \(2H_2 + O_2 ightarrow 2H_2O\) - **Explanation for being a combination reaction**: Two reactants (\(…
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question 1 11.08 g of liquid methanol (ch₃oh) is burned in excess oxyge…
\(-1450\) ---
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2. discuss why the reaction between zinc and hydrochloric acid is not c…
The reaction of zinc and hydrochloric acid is not a combination reaction because it has two products (\(ZnCl_{2}\) and \(H_{2}\)), while a combination reaction has only one produc…
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get this ate \\( \\delta h \\) for the following reaction: \\( \\frac{1…
$90.25$
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calculate $delta h^{circ}$ for the following reaction: $4 mathrm{nh}_{3…
- \( - 360\)
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learn by doing calculate \\( \\delta h^{\\circ} \\) for the following r…
For the first question (how to manipulate rxn(i)): multiply by 2. For the second question (resulting \(\Delta H\) value for rxn(i)): \(-788\)
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use the table of standard thermodynamic properties as needed for the fo…
-184.6 kJ
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did i get this how much heat is produced by burning 19.5 g of acetylene…
974.625 kJ 0.205 mol
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when heated, copper carbonate turns into copper oxide and carbon dioxid…
- Word equation: Copper carbonate → Copper oxide + Carbon dioxide - Balanced symbol equation: \(CuCO_{3}\xlongequal{\Delta}CuO + CO_{2}\uparrow\) - Combination reaction? No
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part a - concept connections match each concept to its correct descript…
1. h 2. c 3. j 4. a 5. d 6. e 7. g 8. f 9. i 10. b
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learn by doing when 1.42 g of iron reacts with 1.90 g of chlorine, soli…
mol Fe: \(0.0254\) mol \(Cl_{2}\): \(0.0268\) Limiting reactant: \(Cl_{2}\), as available \(Cl_{2}\) is less than required by \(Fe\). mol \(FeCl_{3}\): \(0.0179\) \(\Delta H\): \(…
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learn by doing refer to the reactions below to answer the following que…
1. Reaction 3 is endothermic. 2. Reaction 2 has $\Delta H=-445\ kJ$ for the reaction of 1 mole of $O_2$. 3. Reaction 1 would yield the same value for $\Delta H$ if $O_2(l)$ reacte…
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3. you mix solid zinc with tin (ii) nitrate solution. write the balance…
Balanced chemical equation: \(Zn + Sn(NO_3)_2=Zn(NO_3)_2+Sn\) Oxidized element: Zinc (\(Zn\)) Reduced element: Tin (\(Sn\))
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2. you mix lead (ii) nitrate solution with calcium bromide solution. wr…
Balanced chemical equation: \(Pb(NO_3)_2(aq)+CaBr_2(aq)=PbBr_2(s)+Ca(NO_3)_2(aq)\) Complete ionic equation: \(Pb^{2 +}(aq)+2NO_3^{-}(aq)+Ca^{2+}(aq)+2Br^{-}(aq)=PbBr_2(s)+Ca^{2+}(…
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millions of years ago, tiny marine organisms died and sank to the ocean…
C. Petroleum is chemically similar to the remains of marine organisms like bacteria, algae, and plankton. D. Petroleum reservoirs are often found in sedimentary rocks that formed …
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put the steps of petroleum formation in their order of occurrence. firs…
1. Tiny marine organisms like algae and plankton died and sank to the ocean floor. 2. The remains of tiny marine organisms slowly decomposed into organic matter. 3. Organic matter…
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over millions of years, intense heat from earths mantle deep beneath th…
Over millions of years, intense heat beneath the ocean floor and pressure from overlying rocks and sediments transformed organic matter into petroleum.
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instrucciones: elige una respuesta y pulsa siguiente. recibirás tu punt…
electrones
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átomos
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elige una respuesta y pulsa siguiente. recibirás tu puntuación y las re…
vínculo
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sólidos
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núcleo