Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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fill in the blank 1 point f122. write the correct formula for iodine tr…
\(ICl_{3}\)
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fill in the blank 1 point write the correct name for srcl₂. type your a…
strontium chloride
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practice 6.3 1. explain the difference between an ionic bond and a cova…
An ionic bond involves the transfer of electrons between atoms (creating ions) with electrostatic attraction. A covalent bond involves the sharing of electrons between atoms. ### …
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the elements diagonally between the metals and the nonmetals are called…
1. Atomic number: number of protons (defines element). Atomic mass: sum of protons and neutrons (varies for isotopes). 2. Groups elements by properties; predicts chemical behavior…
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chapter 6 atoms and molecules 6. how are the atoms of one element diffe…
The atoms of one element differ from those of another element mainly in their atomic number (the number of protons in the nucleus).
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directions: write the correct name or formula for each compound listed.…
1. hydrochloric acid 2. hydrosulfuric acid 3. hydrobromic acid 4. \( HI(aq) \) 5. \( H_3P(aq) \) 6. nitric acid 7. nitrous acid 8. sulfuric acid 9. sulfurous acid 10. phosphoric a…
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these are general categories that allow us to group elements by their p…
B. bonding
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a 11.164 g mass of ethylene glycol (c₂h₆o₂, automotive antifreeze) is a…
\(7.2\space M\)
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directions: write the correct name or formula for each compound binary …
2. hydrosulfuric acid 4. \(HI(aq)\) 5. \(H_3P(aq)\)
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how are the atoms of one element different from the atoms of another el…
Atoms of one element differ from those of another element mainly by the number of protons in their nuclei (atomic number).
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4. mass measures a weight b how much matter is in something. c the atom…
4. B. how much matter is in something. 5. C. 94
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what is the definition of the following unit of concentration? molarity…
mol solute
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16 multiple choice 2 points • chernobyl experiences nuclear disaster. •…
16. Modern technology can have serious negative effects. 17. geological processes that transform organic materials
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a 25 - ml volumetric flask (25.00 ml) with its stopper has a mass of 21…
\(0.5138\ \text{g/mL}\)
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1. hcl (aq) → hydrochloric acid 2. h₂s (aq) → 3. hbr (aq) → hydrobromic…
2. hydro sulfur ic acid 4. \(HI(aq)\) 5. \(H_3P(aq)\) 6. nitric acid 7. nitrous acid 8. sulfuric acid 9. sulfurous acid 10. phosphoric acid 11. carbonic acid 12. hypochlorous acid…
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you are probably already familiar with many elements because most of th…
1. An atom can be neutral (equal number of protons and electrons), positively charged (loses electrons, becomes a cation), or negatively charged (gains electrons, becomes an anion…
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bonding of atoms in reactions quick check which statement best explains…
Polar covalent bonds share electrons unequally, while nonpolar covalent bonds share electrons equally.
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name: 9) how many moles are present in 34 grams of cu(oh)₂? 10) how man…
\(0.35\space mol\)
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which option contains an example of a polyatomic ion? (1 point) cacl₂ m…
\(KNO_3\)
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bonding of atoms in reactions quick check use the image to answer the q…
Fluorine (F)
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bonding of atoms in reactions quick check approximately in which range …
0.5 to 1.7
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part a - multiple choice (choose the correct answer) 1. what is ionizat…
1. B. The process of gaining or losing electrons to become stable 2. C. Cation 3. C. Oxygen (O) 4. B. Negative ions 5. B. Neon 6. Valence electrons 7. Cation; Anion 8. Lose; Gain …
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1) how many moles are in 15 grams of lithium? 2) how many grams are in …
1) Approximately \(2.16\) moles. 2) Approximately \(76.97\) grams. 3) Approximately \(0.55\) moles. 4) Approximately \(2141.71\) grams. 5) Approximately \(0.07\) moles. 6) Approxi…
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first read: comprehension identify the choice that best answers the que…
C. The fright they experience may create lasting bad memories.
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first read: comprehension identify the choice that best answers the que…
C. The fright they experience may create lasting bad memories.
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6. iodine is 80% ¹²⁷i, 17% ¹²⁶i, and 3% ¹²⁸i. calculate the average ato…
6. The average atomic mass of iodine is \(126.86\). 7. The atomic mass of boron is \(10.801\). 8. The average atomic mass of hydrogen is \(1.012\). 9. The average atomic mass of r…
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ii. answer these: 1. the part of the atom that carries no electric char…
1. Neutrons 2. Protons 3. Electrons 4. \(2\) 5. \(8\) 6. \(8\) 7. Protons and electrons 8. Protons
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directions: for the following problems, show your work! be thorough. 1.…
1. The atomic mass of Europium is \(152.04\) 2. The atomic mass of Strontium is \(87.712\) 3. The average atomic mass of Titanium is \(47.923\) 4. The atomic mass of Copper is \(6…
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question 4 1 pts the students compared the models of a table sugar mole…
Table sugar molecules may repeat to form extended structures.
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question 2 1 pts the students used the models to better understand the …
carbon (C), hydrogen (H), and oxygen (O) atoms.
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the students found that the volume of water increased when it froze. th…
the arrangement of the molecules in the water changes.
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what is the definition of clout? * o a small tool used for farming o a …
Pull; influence
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write the unabbreviated electron configurations or noble gas configurat…
1. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}\) 2. \(1s^{2}2s^{2}2p^{6}3s^{2}\) 3. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\) 4. \([Xe]6s^{2}\) 5. \([Kr]5s^{2}4d^{2}\) 6. Sodium …
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part 1 atomic structure practice: atomic calculations 1. draw five prot…
| Element | Atomic \(\#\) | Mass \(\#\) | \(\#\text{ of }p^{+}\) | \(\#\text{ of }n^{0}\) | \(\#\text{ of }e^{-}\) | |---|---|---|---|---|---| | \(Li\) | \(3\) | \(7\) | \(3\) | \…
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the table gives the quantities, in moles (mol), of atoms in one mole of…
52
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conservation of matter answer the questions using the diagrams provided…
- Los átomos que están presentes en las 3 reacciones son oxígeno (\(O\)) e hidrógeno (\(H\)). - En las 3 reacciones, los reactantes (lado izquierdo) tienen oxígeno (\(O_{2}\)). - …
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what is the maximum number of electrons that a single orbital can hold?…
2
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what is the total number of electrons needed to fill the third main ene…
18
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what is the total number of orbitals in the fourth main energy level? 1…
16
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what is true about atoms in a solid? they vibrate in a tightly packed o…
they vibrate in a tightly packed order with very small empty spaces(no gas can fit)
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organize these options into the right categories color description dens…
- Physical Property: color description, density, boiling point, melting point - Chemical Property: toxicity, flammability, reactivity
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gold 79 au 196.97 which number is the atomic mass? 79 196.97
196.97
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change state of matter is a what type of change? nuclear change physica…
Physical Change
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select the correct answer. looking across period 4 of the periodic tabl…
A. potassium
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which group 4a element has the highest ionization energy? a. carbon b. …
A. carbon
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which group 2a element has the largest ionic radius? a. magnesium b. ca…
D. radium
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select the correct answer. consider the group 1a elements sodium (perio…
B. Na > K > Rb
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select the correct answer. consider the group 1a element sodium (atomic…
B. sodium < aluminum < chlorine
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aluminum and oxygen react according to the following equation: 4 al(s) …
\(79\%\)
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question 3 ethanol burns according to the following reaction: c₂h₅oh + …
\(10.5\)
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a 1.50 gram sample of an unknown hydrocarbon was combusted to produce 4…
\(CH_2\)
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question 1 what are the coefficients that balance the following equatio…
\(2\), \(3\), \(2\), \(2\) (the fourth option)
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hydrogen fluoride is used in the manufacture of freons (which was banne…
\(89\%\)
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nitroglycerin (c₃h₅n₃o₉) is a powerful explosive, used in dynamite. it …
$90.4\%$
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question 17 what is the maximum amount, in g, of p₂i₄ that can be prepa…
\(12.4\)
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consider the reaction 2a + b → c. the diagram shown below represents th…
A
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question 11 the fertilizer ammonium sulfate, (nh4)2so4, is prepared by …
\(6.70\times 10^{4}\space kg\space NH_3\) needed (the third option)
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question 11 the fertilizer ammonium sulfate, (nh₄)₂so₄, is prepared by …
\(6.70\times 10^{4}\space kg\space NH_3\) needed
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which of the following equations best represents the reaction shown in …
\(2C + D ightarrow2A + B\) (the third option)
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read the following passage from stopping by woods on a snowy evening by…
17. d. The speaker's sense of duty 18. a. Denouement 19. c. Line breaks
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8 how does free verse differ from other forms? a. it lacks rules of str…
8. A. It lacks rules of structure, meter, and rhyme scheme 9. D. The presence of hidden truths 10. C. Strength and stability
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question 19 1 pts consider the following reaction: 6 li(s) + n₂(g) → 2 …
\(25.0\%\)
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hydrogen fluoride is used in the manufacture of freons (which was banne…
\(89\%\)
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question 17 consider the following reaction: 2 clf3 + 2 nh3 → n2 + 6 hf…
\(98.4\space g\)
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question 16 when heated, lithium reacts with nitrogen to form lithium n…
\(21.2\ g\)
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consider the following reaction: 2 clf₃ + 2 nh₃ → n₂ + 6 hf + cl₂. if 2…
58.22 g
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consider the reaction 2a + b → c. the diagram shown below represents th…
A. A
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question 11 1 pts industrially, hydrogen gas can be made by combining p…
$1.14\times 10^{3}\ kg\ H_2$ (the second option in the given choices)
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aqueous sulfuric acid is mixed with aqueous sodium hydroxide to form wa…
\(H_2SO_4(aq)+2NaOH(aq) ightarrow 2H_2O(l)+Na_2SO_4(aq)\) (the fourth option)
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write the balanced net ionic equation for the reaction when na₂s and ni…
\(Ni^{2+}(aq)+S^{2 -}(aq)=NiS(s)\)
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write the balanced net ionic equation for the reaction when magnesium i…
\(Mg^{2 +}(aq)+CO_{3}^{2 -}(aq) ightarrow MgCO_3(s)\)
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write the balanced net ionic equation for the reaction when hno₃ and cs…
\(H^{+}(aq)+OH^{-}(aq)\to H_2O(l)\)
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write the balanced net ionic equation for the reaction when hclo4 and h…
NR
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write the balanced net ionic equation for the reaction when copper(ii) …
\(Cu^{2+}(aq)+2OH^{-}(aq)\to Cu(OH)_2(s)\)
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write the balanced net ionic equation for the reaction when aluminum ni…
NR
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write the balanced complete ionic equation for the reaction when (nh₄)₃…
NR
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write the balanced complete ionic equation for the reaction when na₂co₃…
\(2Na^{+}(aq)+CO_3^{2-}(aq)+2Ag^{+}(aq)+2NO_3^{-}(aq) ightarrow Ag_2CO_3(s)+2Na^{+}(aq)+2NO_3^{-}(aq)\)
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complete the balanced molecular chemical equation for the reaction belo…
\(K_2SO_4(aq)+FeCl_3(aq) ightarrow NR\)
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complete the balanced molecular chemical equation for the reaction belo…
\(Cr_2(SO_4)_3(aq)+3(NH_4)_2CO_3(aq)\to Cr_2(CO_3)_3(s)+3(NH_4)_2SO_4(aq)\)
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complete the balanced molecular chemical equation for the reaction belo…
\(2NaCl(aq)+Hg_{2}(C_{2}H_{3}O_{2})_{2}(aq) ightarrow 2NaC_{2}H_{3}O_{2}(aq)+Hg_{2}Cl_{2}(s)\)
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write the balanced dissociation equation for solid potassium chlorate i…
\(KClO_3(s)\xrightarrow{H_2O}K^+(aq)+ClO_3^-(aq)\)
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write the balanced dissociation equation for solid calcium phosphate in…
$$Ca_3(PO_4)_2(s) ightleftharpoons3Ca^{2 +}(aq)+2PO_4^{3 -}(aq)$$
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write the balanced dissociation equation for solid calcium phosphate in…
\(Ca_3(PO_4)_2(s) ightarrow3Ca^{2 +}(aq)+2PO_4^{3 -}(aq)\)
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choose the best answer. what is a soft, white metal that is found in ta…
sodium
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some historians believed that the nebra sky disk, discovered in germany…
C. disproved
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which is a precautionary measure? using a fire extinguisher to put out …
wearing safety goggles while mixing chemicals
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which of the highlighted chemical bonds in the molecules below is longe…
- **Length of highlighted bond**: 1 (longest): \(Ge - H\) bond (second compound), 2: \(Si - H\) bond (third compound), 3 (shortest): \(C - H\) bond (first compound). - **Energy of…
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30 elements in group 17 are also known as the * (0.5 points) enter your…
Halogens
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use the periodic table to rank the grey elements from smallest to large…
B < Al < Br < Se < I
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which of the green elements has the largest atomic radius? * (0.5 point…
\(Na\)
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which of the following would you put in box e? * (0.5 points) s block d…
1. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\)
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deduce which block and period the element cerium belongs to. block peri…
A. f, 6
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5. a mixture of salt, sand, and water passes through a filter. the resi…
compound
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which of the following would you put in box d? * (0.5 points) 1 $1s^{2}…
1. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\)
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24 identify the correct order of increasing first ionization energy. * …
\(F < Ne < He\)
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22 deduce whether the following state is true or false. group 1 is also…
22. B. False 23. A. True
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rank the following ions from smallest to largest. (smallest at top, lar…
- Ion ranking: \(Al^{3+}\), \(Mg^{2+}\), \(Na^+\) - Mercury group number: 12
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identify which of the following could be the electron configuration for…
III only
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18 which property of elements increases down a group but decreases acro…
Atomic radius
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which of the following would you put in box f? * (0.5 points) 1 $1s^{2}…
4. \([Xe]6s^{2}4f^{4}\)