Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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which of the following describes a physical change? * 10 points a marsh…
1. Icicles melt from a rooftop 2. clear liquids mix, producing a cloudy liquid with yellow chunks 3. matter is neither created nor destroyed
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32. approximately how much would 8.0 × 10²⁴ atoms of silver weigh, in g…
$1435$ g
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which of the following changes demonstrates a chemical property? * 10 p…
1. substance combusts 2. salt water 3. physical properties
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what metalloid has commonly been used as an insecticide due to its effe…
A. arsenic
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what is the relationship between proximity and cognitive load for reade…
First question: Good proximity reduces cognitive load by organizing information logically Second question: Whether it creates awkward spacing that hurts readability
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in a multi - page document, what would be the most effective way to app…
1. Consistently place logos and use the same color scheme throughout 2. Proximity - related information isn't properly grouped
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in the four - step c.r.a.p. process, why does proximity come first? it …
1. It establishes the logical organization before styling 2. Clean, organized positioning of elements
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22. mass of an oxygen molecule: 0.00000000000000000000000053 g
$5.3\times 10^{-23}$ g
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22. mass of an oxygen molecule: 0.00000000000000000000000053 g multiply…
23. $4.8\times10^{-4}$ 24. $1.725\times10^{13}$ 25. $1.2495\times10^{-9}$ 26. $3.240405\times10^{3}$ 27. $4.375\times10^{-10}$ 28. $8.6315\times10^{-2}$ 29. $4.6865\times10^{21}$ …
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18. 0.00001203 19. 6.5 20. 8 21. distance from the sun to the earth: 14…
23. $4.8\times10^{-4}$ 24. $1.725\times10^{13}$ 25. $1.2495\times10^{-9}$ 26. $3.240405\times10^{3}$ 27. $4.375\times10^{-10}$ 28. $8.6315\times10^{-2}$ 29. $4.6865\times10^{21}$ …
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quinn is on a high - school volleyball team, and has chemistry during f…
the high - school volleyball team from last season, another school's volleyball team
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mars appears red because its surface is rich in iron oxide. light from …
its surface is rich in iron oxide.
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which disciplines are crucial for a career in art conservation? select …
A. chemistry B. physics C. carpentry D. art history
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question 2 (1 point) (03.01 lc) which of the following describes the el…
A. The use of a series emphasizes physical movement
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decide whether these proposed lewis structures are reasonable. proposed…
1. Yes. 2. No, it has the right number of valence electrons but doesn't satisfy the octet rule. The symbols of the problem atoms are: N 3. Yes.
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fluorine gas is placed in contact with calcium metal at high temperatur…
D. $F_2(g)+Ca(s)\xrightarrow{\Delta}CaF_2(s)$
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consider the unbalanced equation for the oxidation of butene. c4h8 + 6o…
B. four carbon dioxide molecules and four water molecules
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the compound fecl₃ is made of three molecules of iron chloride. one ato…
None of the options are correct. The compound FeCl₃ is made of one atom of iron and three atoms of chlorine.
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which statement best describes the formula equation cl₂(g) + 2kbr(aq) →…
D. Chlorine gas reacts with potassium bromide to form potassium chloride in solution and liquid bromine.
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in a chemical equation, which symbol should be used to indicate that a …
D. (aq)
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this formula equation is unbalanced. p₄(s) + 6cl₂(g) → pcl₃(l) which co…
C. 4
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which word equation shows hydrogen reacting with oxygen to form water? …
hydrogen + oxygen → water
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the compound co2 is made of two atoms of cobalt. one atom of cobalt and…
One atom of carbon and two atoms of oxygen.
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what is the formula equation for the reaction between sulfuric acid and…
C. $H_2SO_4(aq)+2NaOH(aq) ightarrow Na_2SO_4(aq)+2H_2O(l)$
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which symbol can be used to indicate the pressure at which a chemical r…
C. 2 atm
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question 13 0.2 pts some researchers emphasize the ability to recognize…
A. Emotional intelligence
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carbon atoms have four valence electrons. oxygen atoms have six valence…
Draw two pairs of shared electrons (either as lines or dots) between the carbon and oxygen atoms on the given diagram to represent the double - bond where they share electrons to …
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molecules are attracted to one another by van der waals forces. how do …
B. Van der Waals forces are weaker than ionic and covalent bonds.
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how does a molecular compound compare to the elements that make up the …
None of the above options are correct. A compound has properties that are different from the elements that make it up due to the nature of the chemical bonds between the atoms in …
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the atomic number of carbon is six, which means that a carbon atom has …
B. All carbon atoms have six protons and six electrons.
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deuterium is an isotope of hydrogen. it has a mass number of two. which…
A. a nucleus of one proton and one neutron, which is orbited by one electron
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when electrons transfer from one atom to another, both atoms become and…
1st blank: Ions 2nd blank: Ionic 3rd blank: Covalent 4th blank: Molecule
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complete the table about subatomic particles. terms can be used more th…
| Particle | Charge | Location | |--|--|--| | electron | negative | outside the nucleus | | neutron | none (neutral) | inside the nucleus | | proton | positive | inside the nucleu…
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after the transfer of electrons, calcium becomes an ion with a charge o…
+2; -2
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a calcium atom has type here valence electrons. it needs to transfer ty…
2; 2; 6; 2
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a chemist is using 337 milliliters of a solution of acid and water. if …
46.5
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balance the chemical equation below using the smallest possible whole -…
$2NH_3(g)+3O_2(g)+2CH_4(g) ightarrow2HCN(aq)+6H_2O(l)$
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what are the molecular and empirical chemical formulas of a compound ma…
Molecular formula: $C_{2}H_{4}O_{2}$ Empirical formula: $CH_{2}O$
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answer the following. (a) a certain solution has a hydrogen ion concent…
(a) $0.0000914$ moles per L (b) $6.4\times 10^{3}$ pounds
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a penny has a mass of 2.50 g and the moon has a mass of 7.35×10²² kg. u…
$49$
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question 8 what abbreviation represents oxygen? a co2 b n2 c o2 d h2o
C. O2
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4.) avogadros number of particles in a mole holds true for ____. (1 poi…
4. D. All of the above 5. A. $6.022\times 10^{23}$
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3.) what is the smallest representative particle of an element? (1 poin…
A. atom
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2.) the representative particle for gaseous nitrogen is the ____. (1 po…
B. molecule
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1.) what is the si unit that refers to the number of particles containe…
A. mole
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consider the following data for iodine: | | | |--|--| | atomic mass | 1…
For reaction (1): absorb, yes, \(1008.4\ kJ/mol\) For reaction (2): release, yes, \(1008.4\ kJ/mol\)
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18 how many neutrons are in the tungstan - 185 isotope? * (0.5 points) …
18: 111 19: 18
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who discovered the nucleus of an atom? * (0.5 points) dalton thompson r…
1. C. Rutherford 2. 23 3. 92
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which of the following is the correct notation for an atom with 35 prot…
1. $_{35}^{79}Br$
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which statement is correct for the ion with the nuclear symbol * (0.5 p…
It has 18 neutrons and 18 electrons.
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13 which statement is correct for the ion with the nuclear symbol * (0.…
It has 17 protons and 18 electrons. (None of the given options are correct based on the above - derived values. If we assume there is a mis - typing in the options and we focus on…
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13 which statement is correct for the ion with the nuclear symbol * (0.…
It has 18 neutrons and 18 electrons.
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some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | location of elements (blocks) | metals or nonmetals? | | ---- | ---- | ---- | | $[G]ns^{2}of^{7}md^{1}$ | d, f | metals | | $[G]ns^{2}mf^{11}$ …
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12 which statement is correct for the atom with the nuclear symbol * (0…
It has 8 protons in its nucleus.
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all neutral atoms of the same element contain equal numbers of protons …
True ### Question 11
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some patterns of electron configuration are listed below. in each case,…
| electron configuration of atoms | blocks | metals or nonmetals? | | ---- | ---- | ---- | | [G]$ns^{2}of^{7}md^{1}$ | d, f | metals | | [G]$ns^{2}mf^{11}$ | f | metals | | [G]$ns…
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copper (symbol cu) has two naturally occurring isotopes, cu - 63 and cu…
Percent abundance of Cu - 63: 72.5% Percent abundance of Cu - 65: 27.5%
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which is correct for isotopes of the same element? * (0.5 points) isoto…
1. Isotopes of the same element have the same atomic number but a different mass number. 2. Sr - 88
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4 isotopes of the same element have identical (a) properties but differ…
For 4: Chemical For 5: Physical
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use the data in the table to calculate the relative atomic mass of tita…
$47.92$
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silver has two naturally occurring isotopes; ag-107 and ag-109. the rel…
$56.5\%$
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calculate the relative atomic mass of gallium to two decimal places. be…
$69.80$
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incorrect your answer is incorrect. • row 1: your answer is incorrect. …
| electron configuration of atoms | location of elements (check all that apply) | | |--|--|--| | | blocks | metals or nonmetals? | | \([G]ns^{2}md^{10}np^{2}\) | p | metalloids | …
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question 5: remember, on the actual exam, you cant search google images…
a) Resonance structures for ozone ($O_3$): $O = O - O$ and $O - O = O$ b) Resonance structures for $COOH^-$: $O = C - O^-$ and $O^- - C = O$ c) Resonance structures for $NCS^-$: $…
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jakobs bravery l han jakobs mom told him that laughing was not the way …
A. It makes the reader pause on Jakob's bravery.
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question 19 1 pts ______ is the systematic denial that racism exists, a…
Question 19: D. Colorblind racism Question 20: A. A microaggression
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a. what is the difference between an intermolecular and intramolecular …
a. Intermolecular forces are between molecules; intramolecular forces are within a molecule. b. London - dispersion, dipole - dipole, hydrogen bonding, covalent, ionic. c. Below 1…
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potassium chromate express your answer as a chemical formula. a chemica…
Potassium chromate: $K_2CrO_4$ Copper(I) fluoride: $CuF$
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copper(i) chloride express your answer as a chemical formula. a chemica…
Part A: $CuCl$ Part B: $Fe(IO_3)_2$
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correct for an ionic compound containing a polyatomic cation and a mono…
Part C: sodium bromate Part D: iron(III) hydroxide
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ba(oh)₂ spell out the full name of the compound. part b nh₄f spell out …
Part A: Barium hydroxide Part B: Ammonium fluoride
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part c crf₂ spell out the full name of the compound. part d crcl₂ spell…
Part C: Chromium(II) fluoride Part D: Chromium(II) chloride
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part a sno₂ spell out the full name of the compound. submit request ans…
Part A: tin(IV) oxide Part B: mercury(I) iodide Part C: chromium(II) fluoride
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part c enter the compound that forms between sodium and hydrogen phosph…
Part C: $Na_2HPO_4$ Part D: $NaC_2H_3O_2$
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enter the compound that forms between sodium and carbonate. express you…
Part A: $Na_2CO_3$ Part B: $Na_3PO_4$
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potassium and oxygen express your answer as a chemical formula. a chemi…
Part A: $K_2O$ Part D: $BaBr_2$
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cesium and chlorine express your answer as a chemical formula. a chemic…
Part A: CsCl Part B: $Ca_3N_2$
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give the systematic name for the compound al(no3)3. spell out the full …
Aluminum nitrate Iron(III) sulfate BaO
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classify each of the following compounds as ionic or molecular. drag th…
Molecular: $CF_2Cl_2$, $CO$, $NI_3$ Ionic: $KMnO_4$, $Pb(NO_3)_2$
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classify the following compounds as having covalent or ionic bonds. dra…
Covalent bonds: sulfur trioxide, phosphorus trichloride Ionic bonds: strontium iodide, barium chloride, aluminum sulfide, potassium iodide
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which of the following would you expect to be a molecule and which woul…
Molecular: SO, CO, HCl Ionic: KF, CaS, KCl, NaI, MgO
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an eifs assembly may consist of all of the following except plywood she…
1. C. metal lath 2. A. is associated with water moving through masonry walls
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co₂(g) + casio₃(s) + h₂o(l) → sio₂(s) + ca(hco₃)₂(aq) express your answ…
$CO_2(g)+CaSiO_3(s)+H_2O(l) ightarrow SiO_2(s)+Ca(HCO_3)_2(aq)$
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section 4.1 early ideas about matter in your textbook, read about the p…
1. False 2. True 3. True 4. True 5. False 6. False 7. True 8. True 9. False 10. True
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bonds quick check how many covalent bonds is nitrogen (group 5a) likely…
A. three
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which type of bond and how many bonds would occur as carbon dioxide (co…
D. four covalent bonds
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bonds quick check which kind of bond would occur between sodium (na, gr…
A. Ionic
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bonds quick check between which types of elements do ionic bonds occur,…
metals and nonmetals, electrons transferred
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bonds quick check metallic bonds are responsible for many properties of…
The bonds can shift because valence electrons are held loosely and move freely.
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question 3: the enolate ion, known as a formula of c2h3o, has two possi…
a) Structure A is more likely because it has a negative formal charge on the more electronegative oxygen atom. b) The hybridization of carbon 'X' in structure A is $sp^{2}$, and t…
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3 viable lewis dot structures are shown for dinitrogen oxide, n2o. asse…
a) Structure B is the most valid because it has formal charges closest to zero for all atoms and satisfies the octet - rule for all atoms. b) 3 sigma and 2 pi bonds in structure B…
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aqueous hydrochloric acid (hcl) reacts with solid manganese(iv) oxide t…
$4HCl(aq)+MnO_2(s) ightarrow MnCl_2(aq)+2H_2O(l)+Cl_2(g)$ $C_7H_{16}(l)+11O_2(g) ightarrow 7CO_2(g)+8H_2O(l)$
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(question 1 continued) n₂ can react with h₂ to form the compound n₂h₄. …
(e) Molar mass of $N_2H_4$ (f)(i) The nitrogen - to - nitrogen bond in $N_2$ is shorter than that in $N_2H_4$. (f)(ii) The nitrogen - to - nitrogen bond in $N_2$ is stronger than …
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4. completing the assignment: • balance the following chemical equation…
$2H_2+O_2 ightarrow 2H_2O$; $N_2 + 3H_2 ightarrow 2NH_3$ (already balanced); $C_3H_8 + 5O_2 ightarrow 3CO_2+4H_2O$ (already balanced); $2Al + Fe_2O_3 ightarrow Al_2O_3+2Fe$ (alrea…
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solid lead(ii) sulfide reacts with aqueous hydrobromic acid (hbr) to fo…
$PbS(s)+2HBr(aq) ightarrow PbBr_2(s)+H_2S(g)$ $2CO(g) + 4H_2(g) ightarrow 2CH_4(g)+O_2(g)$
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a metal (m) forms an oxide with the formula mo. if the oxide contains 2…
$Ca$
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progesterone, which contains only carbon, hydrogen, and oxygen, is a st…
$C_{21}H_{30}O_2$
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combustion analysis of a 13.42 - g sample of estradiol (which contains …
$C_{18}H_{24}O_2$
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what is the average atomic mass of boron if it exists as 19.90% $^{10}$…
$10.81$ amu
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when food is exposed to air, it can lose electrons. this loss of electr…
A. Free radicals