Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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the drawing below shows a mixture of molecules. suppose the following c…
Limiting reactant: $C_2H_2$ Reactant with the least initial moles: $C_2H_2$ Reactant with the most initial moles: $O_2$
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question 9 are particles found in the nucleus of an atom with no charge…
Neutrons
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question 8 1 pts are particles found in the nucleus of an atom with a p…
Protons
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performing percent composition calculations carbon dioxide (co₂) is a g…
What is the percent by mass of carbon? 27.3% What is the percent by mass of oxygen? 72.7%
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which statement best describes the rhythm of \song of myself\? the poem…
The rhythm is very similar to the rhythm of everyday speech.
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for the reaction mathrm{kclo}_{3} longrightarrow mathrm{kcl}+\frac{3}{2…
K in KClO₃: + 1 K in KCl: + 1 Cl in KClO₃: + 5 Cl in KCl: - 1 O in KClO₃: - 2 O in O₂: 0 Which element is oxidized? O Which element is reduced? Cl
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part iii. intro to gasses r = 0.08206 l - atm / mol - k 1.00 atm = 14.7…
- 2.65 atm in bar: 2.6851125 bar - 2.65 atm in torr: 2014 torr - 2.65 atm in psi: 38.955 psi - 2.65 atm in kPa: 268.51125 kPa - 5a final volume: 10.12 L - 5b final volume: 12.32 L…
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question 5 use the equation above to help you calculate the heat of com…
- 1324 kJ/mol
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identify the unbalanced half - reaction in which a species is reduced. …
The unbalanced half - reaction in which a species is reduced: \(SO_4^{2 -}(aq)\to H_2S(g)\) Initial oxidation state of iodine: - 1 Final oxidation state of iodine: 0
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73. label the following ph scale with the correct numbers at the far en…
Label the left - hand end of the pH scale as 0 (acidic), the center as 7 (neutral), and the right - hand end as 14 (basic). Draw a line between 4.5 and 5.5 to represent the pH of …
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write the overall molecular equation for the reaction of hydroiodic aci…
$HI(aq)+KOH(aq) ightarrow KI(aq) + H_2O(l)$
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question 6 of 19 consider this aqueous reaction. hno₃(aq) + ba(oh)₂(aq)…
$Ba(NO_3)_2$
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the skeletal structure of (2e)-but-2-enamide (mm = 85.106 g/mol) is sho…
$7.7\times 10^{23}$
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if you only had the gumdrops that represent hydrogen atoms and oxygen a…
Moleculas como H₂O y H₂O₂ (si las hubiera en la lista no mostrada).
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for each compound in the table below, decide whether there would be any…
| Name | Hypochlorous acid | Acetic acid | Dimethyl ether | |--|--|--|--| | Between molecules of the compound? | Yes | Yes | No | | Between molecules of the compound and molecules…
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if you had only one water molecule, could you break it up and make some…
# Explicación breve: Una molécula de agua (H₂O) consta de dos átomos de hidrógeno y un átomo de oxígeno. Para formar otras moléculas sin átomos sobrantes, se necesitaría un número…
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identify the relationship between these two structures. a. diastereomer…
B. enantiomers
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what is the relationship between the following compounds? a. diastereom…
A. Diastereomers
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how are the following structures related? a. diastereomers b. enantiome…
A. Diastereomers
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question 1 of 9 what needs to happen in order for the ssms graphical ed…
the table must have a primary key
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a student investigated a sample of unknown gas. which statements repres…
The unknown gas is carbon dioxide.
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9. at standard temperature and pressure, krypton has a density of 0.003…
824.22 mL
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7. the density of platinum is 21.45 g/cm³. what is the mass of a sample…
$75.075\ g$
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the sugar, on the other hand, is dissolved, and its physical properties…
1. changed 2. heterogeneous mixtures 3. separated 4. filtration
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an atherosclerotic aneurysm is described as a _______ aneurysm. saccule…
1. B. fusiform 2. B. False
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an atherosclerotic aneurysm is described as a ______ aneurysm. fusiform…
1. A. fusiform 2. B. False
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oxyacids) question what is the name for the acid with the formula hclo₂…
B. Chlorous acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
Phosphite acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
B. Nitrous acid
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learning: molecular compounds - acids (binary & oxyacids) question what…
D. $HClO_4$
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question 1 what is the formula for acetic acid? answer hcooh ch₃cooh co…
B. $CH_3COOH$
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look at your gumdrop model of a water molecule. if you had several of t…
# Explicación: ## Paso 1: Identificar átomos en molécula de agua Una molécula de agua ($H_2O$) está formada por dos átomos de hidrógeno ($H$) y un átomo de oxígeno ($O$). ## Paso …
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question what is the name for the compound with the formula h₂co₃? answ…
B. Carbonic acid
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oxyacids question ① identify the acid formed from the hypochlorous anio…
C. HClO
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question 1 what is the name for the acid with the formula hno₃? answer …
Nitric acid
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learning: molecular compounds - acids (binary & oxyacids) question ① wh…
$CO_3^{2 - }$ (the second option among the given ones which should be $CO_3^{2 - }$ assuming there is a typo in the display where the superscript formatting might be off)
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place a t for true or an f for false on the blank for each of the follo…
15. T 16. T 17. F, Necesita perder 2 electrones para estabilizarse 18. F, electrones 19. T 20. T 21. T 22. F, comparten un par de electrones 23. F, pueden 24. T 25. T 26. F, débil…
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learning: molecular compounds - acids (binary & oxyacids) question what…
B. $HBr$
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if there are six h₂o molecules, then the notation is 6 h₂o. a. how many…
a. 12 b. 6 c. 12 átomos de hidrógeno y 6 átomos de oxígeno
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question what is the name for the acid with the formula hclo₂? answer c…
Chlorous acid
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question ① given the formula for borate as bo₃³⁻, what is the formula f…
$H_3BO_3$ (corresponding to the option $H_3BO_3$ in the multiple - choice list)
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tobacco damage tobacco use damages the body in many ways. it can be har…
1. respiratory system 2. circulatory system 3. excretory system 4. digestive system 5. nervous system 6. circulatory system 7. respiratory system 8. nervous system 9. excretory sy…
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what is the name for the acid formed from the po₃³⁻ anion? answer phosp…
B. Phosphoric acid
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use each of the terms below just once to complete the passage. covalent…
(1) ión (2) enlace iónico (3) compuesto iónico (4) configuración de octeto (5) regla del octeto (6) cristal (7) electrolito (8) compuesto covalente (9) enlace covalente (10) moléc…
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review: how to count atoms. the symbol of an element represents one ato…
| Type of Atoms | # of Atoms | | ---- | ---- | | N | 4 | | H | 16 | | Cr | 4 | | O | 14 | | Total | 38 |
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analyzing a chemical formula answer the following questions with your t…
a. 2 b. 1 c. 2 átomos de hidrógeno y 1 átomo de oxígeno
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question 2 what might the birthmark on georgianas check symbolize? the …
human imperfection
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iv. cer practice like most students, megan really enjoyed doing labs in…
Claim: Megan did not follow all safety rules. Evidence: Only safety gloves mentioned, no goggles. Reasoning: Eye - protection crucial with acids, no goggles means not all rules fo…
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which type of reaction does not require activation energy to get starte…
C. None—all reactions require activation energy to get started.
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learning: molecular compounds - acids (binary & oxyacids) question what…
C. $H_2SO_3$
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learning: molecular compounds - acids (binary & oxyacids) question what…
$HClO_{4}$
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a student drew and labeled the graph based on the results of an experim…
D. to show that the reaction needed heat to occur
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water is the ____________ solvent.
universal
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name:diannelys navarro date:0 - 07 - 2026 7th ford ham 7th grade scienc…
# Breve explicación: 1. El pasaje explica cómo los materiales cambian de tamaño cuando se calientan (expansión térmica) o se enfrían (contracción térmica), que son cambios físicos…
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which is an example of a chemical reaction? a) sugar dissolving in wate…
D. iron rusting
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question identify the formula for permanganic acid. answer h₂mno₄ hmno₄…
$HMnO_4$
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which is the best description of activation energy? a) heat released as…
B) heat added to initiate a reaction
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learning: molecular compounds - acids (binary & oxyacids) question iden…
B. $\text{H}_{3}\text{PO}_{4}$
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learning: molecular compounds - acids (binary & oxyacids) question 1 wh…
C. Hydrochloric acid
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learning: molecular compounds - acids (binary & oxyacids) question iden…
$H_2CrO_4$
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7. in a solution the being dissolved. a. solute b. solvent water is the…
7. a. solute 8. Dissolving is a mixing process at the molecular level between a solute and a solvent, while melting is a phase - change of a solid to a liquid due to temperature i…
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multiple choice 10 points exercise can make you feel good. what evidenc…
D. Exercise can give you a good feeling, like after a run (or another hard workout). It is probably a combination of feel - good brain chemicals and pride.
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2. complete the blanks by answering the blanks for the indicated atoms …
Molecular geometry of Carbon indicated by "a": Tetrahedral Bond angle around Carbon indicated by "a": 109.5° Hybridization at a of Carbon indicated by "a": $sp^{3}$ Molecular geom…
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explain the difference between an endothermic and exothermic reaction. …
Endothermic reactions absorb heat (e.g., dissolving ammonium nitrate in water). Exothermic reactions release heat (e.g., combustion of wood).
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question 15 (2 points) write a shorthand electron configuration for the…
[Ar]3d¹⁰
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question 14 (2 points) write a shorthand electron configuration for the…
$[Kr]5s^{2}4d^{10}5p^{6}$
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5. explain the different types of mixtures: homogenous and heterogenous
A homogeneous mixture has a uniform composition and properties throughout. A heterogeneous mixture has a non - uniform composition with visible different parts or phases.
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3. name 3 examples of chemical properties.
Combustibility, Reactivity, Flammability
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6. what is the simplest form of any pure substance?
An element
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2. if he uses 0.8 gb per day, how many days can he use the data before …
$\begin{cases}x + y\leq35\\12x + 15y\geq450\\x\geq0\\y\geq0\end{cases}$ #### 2.
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2. if he uses 0.8 gb per day, how many days can he use the data before …
1.25 days ### 3.
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general knowledge matching match each of the items in the left column t…
1. F. A substance whose chemical action can damage body structures or impair body functions 2. H. Misuse of any substance to produce a desired effect 3. G. A substance that will c…
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decide whether these proposed lewis structures are reasonable. proposed…
1. No, it has the wrong number of valence electrons. The correct number is: 16 2. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols …
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what is the missing coefficient to make a balanced equation? 2na + ?cl₂…
The coefficient of $Cl_2$ is 1 and the coefficient of $NaCl$ is 2.
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what is the missing coefficient to make a balanced equation? ? na + cl₂…
2
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which of the following is true of iron? a. it has the highest electrica…
D
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decide whether these proposed lewis structures are reasonable. proposed…
1. No, it has the wrong number of valence electrons. The correct number is: 8 2. No, it has the wrong number of valence electrons. The correct number is: 14 3. Yes.
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in the united states, the onset of puberty has been occurring earlier a…
- exposure to pollutants - exposure to phthalates - unhealthy weight gain - disruptions to the endocrine system
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which of the following equations does not follow the law of conservatio…
Na + Cl2--> NaCl
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how many electrons does carbon have in its valence orbital? ______ (num…
4 False
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the subatomic particle with no charge. neutron electron proton ion
A. neutron
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the subatomic particle that identifies the atom. electron neutron proto…
C. proton
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question 9 (1 point) which subshell contains only one orbital? 1p 2s 3d…
B. 2s
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chemical bonds are made of these subatomic particles. protons neutrons …
C. electrons
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question 7 (1 point) which principle or rule demonstrates the fact that…
B. Hund's Rule
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question 14 1 pts the molecules on the left side of the arrow in an equ…
reactants
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question 6 (1 point) which pair of elements have valence electron confi…
Fluorine and chlorine
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question 13 1 pts the type of bond that forms when one atom transfers a…
ionic
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question 12 1 pts atoms that gain or lose electrons are called ________…
ions
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question 5 (1 point) s - block elements consist of all but which one of…
D. titanium
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limestone is mostly made of sediment and the fossilized remains of anci…
| | Chemical weathering | Gas exchange | Limestone formation | |--|--|--|--| | Carbon from the atmosphere interacts with the geosphere and then moves to the hydrosphere via runoff…
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question 11 a substance made entirely of one atom is known as an ______…
element
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this type of engineering deals with the motion of electrons in metals. …
D. Electrical
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determine whether each statement is true or false. runoff from the chem…
1. True 2. False 3. True 4. True
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this type of engineering applies scientific principles of chemistry, ph…
B. Chemical
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question 4 (1 point) the magnetic quantum number of an orbital defines:…
The spatial orientation of the orbital
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an atom that has extra neutrons is known as an _______________. (one wo…
isotope
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the 1980 eruption of mount saint helens in washington state released 10…
Reactants: carbon - based fuel, oxygen Products: carbon dioxide, water vapor
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question 3 (1 point) the n = 1 energy level contains ________ p orbital…
0, 3
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question 7 1 pts electron in the outer most shell are known as ________…
valence