Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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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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read the lines from act i, 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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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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select the correct answer from each drop - down menu. hydrogen can be c…
solar energy
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bj: common applications use the information below to answer the questio…
sand molding
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group of elements with the same number of valence electrons.
Group (in the periodic table)
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5. water is 2 parts hydrogen and 1 part oxygen (h₂o). for one molecule …
Approximately 11.2%
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the accepted value of r is 8.314 j mol⁻¹ k⁻¹. which of the following un…
kPa L mol⁻¹ K⁻¹, Pa m³ mol⁻¹ K⁻¹
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you can use this periodic table during the quiz. however, as stated in …
$Al_2O_3$: 9. electrostatic (ionic) $SiO_2$: 8. covalent network $NH_3$: 5. hydrogen - bond $F_2$: 1. dispersion (London) $ICl$: 4. dipole - dipole
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5. refer to the handbook of chemistry and physics, the elements, to res…
| Name | Density ($g\cdot cm^{-3}$) | mp ($^{\circ}C$) | bp ($^{\circ}C$) | | ---- | ---- | ---- | ---- | | Cobalt | 8.9 | 1495 | 2927 | | Magnesium | 1.74 | 648.8 | 1090 | | Mang…
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a chemist mixes 25 milliliters of a solution that is 44% acid with 225 …
(a) 236 milliliters (b) 94.4%
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in one atom, what is the maximum number of electrons that could have th…
32
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question 14 (1 point) the geometry of the icl₂⁻ molecule is best descri…
linear
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question 13 (1 point) molecules or ions with a tetrahedral shape includ…
D. i. and iii. only
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postlaboratory assignment 1. state whether the following properties are…
1. (a) metal (b) non - metal (c) metal (d) non - metal (e) metal (f) non - metal 2. (a) element (b) homogeneous mixture (c) compound (d) heterogeneous mixture 3. (a) phys (b) phys…
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in one atom, what is the maximum number of electrons that could have th…
8
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question 12 (1 point) which of the following molecules is linear in sha…
C. $CO_2$
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which statement best describes the rhyme schemes of the author to her b…
Bradstreet uses couplets for their overall rhyme scheme and structure; Wheatley uses couplets to enhance the poem as a song of praise for creation.
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question 11 (1 point) based on the vsepr theory, which one of the follo…
HCN
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question 10 (1 point) using the vsepr theory, predict that the shape of…
B. linear
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which of the following sets of quantum numbers can describe a 3p electr…
C. $n = 3,\ell = 1,m_{\ell}=1$
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question 9 (1 point) vsepr predicts an sbf5 molecule will be which of t…
B. trigonal bipyramidal
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question 8 (1 point) a molecule exhibits the trigonal bipyramidal shape…
Five
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in one atom, what is the maximum number of electrons that could have th…
18
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question 7 (1 point) which of the following molecules demonstrates a tr…
B. BF₃, C. NO₃⁻
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given n = 2, identify which of the quantum numbers is not possible. ans…
B. $l = 2$
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question 6 (1 point) which of the following molecules demonstrates a sq…
None of the above options have a square - pyramidal molecular structure.
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question 5 (1 point) the bond angle in co₃²⁻ is expected to be approxim…
C. 120 degrees
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if n = 3, what is the maximum allowed value for ℓ?
2
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question 3 (1 point) which of the following has the greatest number of …
\(I_3^-\)
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question 2 (1 point) which of the following factors are involved in for…
D. all of the above
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fill in the missing word(s) or number(s). molar mass has units of _____…
grams
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how many molecules are in 3.68 moles of h₂? __________ x10²⁴ molecules
$2.22$ (rounded to two - decimal places)
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you can use this periodic table during the quiz. however, as stated in …
\(SF_6\)
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which is the proper chemical formula for iron(iii) sulfide? fes irs3 fe…
C. $Fe_2S_3$
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question 4 (1 point) give the element symbol (blank 1) and the superscr…
Blank # 1: Fe Blank # 2: 3+
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give the element symbol (blank 1) and the superscript for the charge (b…
Blank # 1: O Blank # 2: 2-
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which formula correctly shows how to calculate the percent composition …
$\frac{63.9976\ amu}{116.316\ amu}\times100$ (the fourth option)
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question 1 (3 points) classify each substance as ionic or covalent. sod…
sodium sulfide: ionic carbon monoxide: covalent KCl: ionic sulfur trioxide: covalent $P_2O_5$: covalent NaOH: ionic
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select all of the particle diagrams below that represent a heterogeneou…
The second and third particle diagrams represent a heterogeneous mixture.
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match each definition to the correct term. made up of one type of atom …
1. Pure - substance 2. Homogeneous mixture 3. Colloid 4. Suspension 5. Element 6. Compound 7. Solution
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7 multiple choice 1 point how does a compound differ from an element? e…
An element has only one type of atom and compounds have two or more atoms bonded together.
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4. what is the purpose of the boiling chip when determining the boiling…
- **Question 4**: To provide nucleation sites and prevent super - heating and bumping. - **Question 5**: Color change, precipitate formation, gas evolution, heat/light production.…
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base your answers to the questions on the information and diagram below…
Top - layer: D Second - layer: C Third - layer: B Bottom - layer: A
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the four diagrams below model the results of mixing atoms of different …
B
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19 multiple choice 1 point which of these is a mixture with matter than…
19. D. Homogeneous mixture 20. 2.65 mL
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which of these is an compound? tea copper, cu shampoo sodium hydroxide,…
1. D. sodium hydroxide, NaOH 2. D. Increasing temperature results in faster moving particles and more frequent and forceful collisions.
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2. draw the electron dot diagrams and answer the following questions a)…
- Electron - dot diagram of Phosphorus: Place 'P' with 5 dots around it. - Electron - dot diagram of Arsenic: Place 'As' with 5 dots around it. - Answer to 2b: Phosphorus and arse…
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prelaboratory assignment 1. provide the key - term that corresponds to …
1. (a) Heterogeneous mixture (b) Homogeneous mixture (c) Substance (d) Compound (e) Element (f) Physical property (g) Chemical property (h) Physical change (i) Chemical change (j)…
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platinum is a metal that has a high luster. what does this mean? it can…
It is very shiny.
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ch4 + o2 → co2 + h2o + énergie a) dans quelle catégorie de réactions ch…
# Explications étape par étape: ## Étape 1: Réponse à la question a) La combustion du méthane ($CH_4$) est une oxydation exothermique. La réponse est 4) Toutes ces réponses. ## Ét…
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aluminum is very malleable. what does this mean? it can easily be press…
It can easily be pressed into sheets.
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which is a characteristic of metals? brittle insulative malleable
malleable
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which of the following is not a property of metals? malleable poor cond…
B. poor conductors
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metals make up most of the periodic table. we can describe them based o…
It can be pulled into a wire easily.
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which of the following is an example of a product - based business? jon…
Question 1: B. Tierra's Antique Auction Question 2: True Question 3: B. A focus group
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7 parmi les combustibles suivants, lequel est le plus sujet à subir une…
# Explications étape par étape: ## Étape 1: Réponse à la question 7 Plus le point d'ignition est bas, plus il y a de chances de combustion spontanée. La réponse est a) Un combusti…
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periodic structure & element classes homework periodic table structure …
1) a. nonmetal; b. metal; c. nonmetal; d. metalloid; e. metal; f. metalloid 2) a. argon; b. chlorine; c. cesium; d. germanium; e. cadmium; f. phosphorus 3) (Depends on the positio…
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which scenario correctly represents the law of conservation of energy? …
Plants transform light energy from sun into chemical energy stored in sugar molecules.
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but equally important is sagacity, which the chemist louis pasteur famo…
C. perceptiveness
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1 dans un récipient ouvert, on fait réagir 35 g de réactifs. lorsquon p…
1. a) 2. a) 3. b) 4. d) 5. b) 6. c)
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which statement best describes the rhyme scheme of \a thought on the in…
We need the actual poem "A Thought on the Inestimable Blessing of Reason" to accurately determine which statement is correct.
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from return of the native the scene was strangely homogeneous, in that …
4. No. because the figure remains inseparable from the structure as a whole until she moves, implying that the word means "motionlessness."
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which of the following is an example of a product - based business? jon…
- Question 27: Tierra's Antique Auction - Question 28: True - Question 29: A focus group
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from nature; addresses, and lectures i. the first in time and the first…
4. Man desires to find the interrelation of elements in nature.
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read the passage. there are several questions about this passage. hoof …
Part A: 2. the petrol Part B: 1. "explodes into power"
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write a paragraph comparing and contrasting how the poets use topic, rh…
[Paragraph here would analyze two or more poets, for example: Poet A might choose a nature - related topic, use an ABAB rhyme scheme to create a steady rhythm, and use personifica…
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which describes a climate effect on the rate of weathering? cold climat…
Cold climates favor mechanical weathering.
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which factor contributes to both chemical and mechanical weathering? ab…
water
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what is the difference between an empirical formula and a molecular for…
An empirical formula represents the simplest whole - number ratio of atoms in a compound. A molecular formula shows the actual number of atoms of each element in a molecule. The m…
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complete the table below by referencing a periodic table. |element|chem…
1. C. ATOM 2. A. PROTON 3. D. ELECTRON 4. E. NEUTRON 5. B. NUCLEUS