Chemistry
Chemical reactions, stoichiometry, molecular structures, and element properties.
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determine the charge of each of the following ions. part a tungsten ion…
\(6+\)
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what is the symbol for the ion that forms when oxygen gains two electro…
$O^{2 - }$ (the first option)
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carbon with 8 neutrons # p =____ # n =____ # e =____ rons than protons,…
\(P = 6\), \(N = 8\), \(E = 6\)
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an electron atoms can have more or fewer electrons than protons. but wh…
\(\#P = 8\), \(\#N = 8\), \(\#E = 10\)
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what is an anion? this is a negative ion formed when an atom or group o…
For "What is an anion?": This is a negative ion formed when an atom or group of atoms gains one or more electrons. For "What is a cation?": This is a positive ion formed when an a…
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what scientist noticed that certain groups of elements had similar prop…
C. Mendeleev
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but what about those other two particles? can they change? lets look at…
The atomic number for carbon is \(6\). This means that it has \(6\) protons. The particle chart shows that I have \(6\) neutrons. The chart also shows that I have \(6\) electrons.
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where on the periodic table are metalloids found? the metalloids are in…
The metalloids make up the zigzag section that separates the metals and the nonmetals which is found running from boron to astatine.
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what is the main idea in the periodic law? the periodic law showed that…
The periodic law showed that while the elements have unique properties, there is a periodic repetition of similar properties.
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ig the appropriate items to their respective bins. oxygenchlorinetinlit…
Metal: tin, lithium Non - Metal: oxygen, chlorine Metalloid: (empty)
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which elements are not main - group elements? check all that apply. al …
Mo
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which elements are alkali metals? check all that apply. scandium potass…
potassium, lithium
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part a which elements are alkaline earth metals? check all that apply. …
magnesium, beryllium
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do you expect the pair of elements li and na to be most similar? 1 the …
Li and Na are elements of the same group, therefore, they have the same number of valence electrons, which determine similar chemical properties.
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part a which pair of elements do you expect to be most similar? ge and …
Li and Na
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missed this? watch kcv: the periodic law and the periodic table; read s…
Mo
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a nurse is reviewing the medical record of a client on a chemical depen…
Promotion of independence
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question 20 0.5 pts which of the following products would be the best c…
Bottled water
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calculate the formula mass for dinitrogen pentoxide. express your answe…
- Part D: \(108.02\space amu\) - Part E: \(Cu_2SO_4\) - Part F: \(223.17\space amu\)
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give the correct formula for barium chloride. express your answer as a …
- Part A: \(BaCl_{2}\) - Part B: \(208.23\) amu - Part C: \(N_{2}O_{5}\)
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fe(no₃)₃ express your answer in atomic mass units to two decimal places…
\(100.20\) amu
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cs₂ express your answer in atomic mass units to two decimal places. for…
For \(CS_2\): 76.15 amu For \(C_6H_{12}O_6\): 180.18 amu For \(Fe(NO_3)_3\): 241.88 amu
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phosphoric acid correct part g provide the name of the oxyanion of the …
hydrochloric acid
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part d name the acid hc₂h₃o₂(aq) spell out the full name of the acid. p…
acetate ion
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is a durable material and is widely used for casting, which is a proces…
A. Bronze
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decide whether these proposed lewis structures are reasonable. proposed…
- For \(H - C = N\): No, it has the wrong number of valence electrons. The correct number is \(10\). - For \([H - O:]^{-}\): Yes. - For \(O - C - O\): No, it has the wrong number …
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part c provide the name of the oxyanion of the acid h₂co₃(aq) spell out…
acetic acid
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name the acid: h₂co₃(aq). spell out the full name of the acid. carbonic…
carbonate
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binary acid hcl(aq) submit previous answers correct part b name the aci…
carbonic acid
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22. what is the main difference between bohrs model of the atom and the…
Bohr's model has electrons in fixed circular orbits; the current model uses electron clouds (probability distributions) instead of definite paths.
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part f tetraphosphorus triselenide express your answer as a chemical fo…
\(P_4Se_3\)
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xenon hexafluoride express your answer as a chemical formula. submit re…
\(XeF_{6}\)
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xenon hexafluoride express your answer as a chemical formula. submit re…
Part D: \(CBr_4\) Part E: \(B_2Cl_4\)
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part d sicl4 spell out the full name of the compound. silicon tetrachlo…
diiodine pentoxide
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xef4 spell out the full name of the compound. submit request answer par…
- Xenon tetrafluoride - Phosphorus triiodide - Sulfur trioxide - Silicon tetrachloride
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3. a sample has a mass of 42.58 g. the water level rises from 15.0 ml t…
- Displaced volume: \( 15.78\ \text{mL} \) - Density: \( \approx2.7\ \text{g/mL} \) - Substance match: Likely aluminum (may not have multiple common pure - substance matches with …
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part b fe(oh)3 spell out the full name of the compound. submit previous…
- Part B: iron(III) hydroxide - Part C: copper(II) nitrite
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hgbr₂ spell out the full name of the compound. submit request answer pa…
- \(HgBr_2\): Mercury (II) bromide - \(Fe_2O_3\): Iron (III) oxide - \(CuI_2\): Copper (II) iodide - \(SnCl_4\): Tin (IV) chloride
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part a nal spell out the full name of the compound. submit request answ…
- Part A: Sodium iodide - Part B: Strontium sulfide - Part C: Magnesium fluoride - Part D: Sodium fluoride
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part d enter the formula for the compound that forms from calcium and h…
\(CaHPO_{4}\)
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enter the formula for the compound that forms from calcium and phosphat…
\(Ca_{3}(PO_{4})_{2}\)
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part d calcium and iodine express your answer as a chemical formula. a …
\(CaI_2\)
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as part of a chemistry experiment, barry is making a mixture of two sol…
B. The ratio of the number of cups of solution A to the total number of cups of the mixture is \(2:3\).
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aluminum and oxygen express your answer as a chemical formula. a chemic…
Part A: \(Al_{2}O_{3}\) Part B: \(BeI_{2}\) Part C: \(CaS\)
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classify each compound as ionic or molecular. if a compound is ionic, d…
- Molecular: \(CF_4\), \(NO\) - Ionic, one type of ion: \(BaSO_4\) - Ionic, more than one type of ion: \(CoCl_2\)
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a chemist carefully measures the amount of heat needed to raise the tem…
\(4.18\space J\cdot g^{-1}\cdot K^{-1}\)
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classify each compound as ionic or molecular. drag the appropriate item…
Ionic: CuO, KBr Molecular: CS₂, PBr₃
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express your answers as integers separated by commas. number of al, n, …
\(1,2,2,6\)
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h₃po₄ express your answers as integers separated by commas. number of h…
- Part A: \(3,1,4\) - Part B: \(1,3,9\) - Part C: \(1,2,4\)
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two iron atoms for every three oxygen atoms express your answer as a ch…
\(Fe_2O_3\)
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multiple choice 2 points sn1 reactions usually proceed with______. slig…
slightly more inversion than retention at the center undergoing substitution
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part a two sodium atoms for every oxygen atom express your answer as a …
Part A: \(Na_{2}O\) Part B: \(AsBr_{3}\) Part C: \(AsCl_{5}\)
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multiple choice 2 points which of the following factors is favorable fo…
A. highly polarizable
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multiple choice 2 points which of the following is classified as a viny…
CH₃CH=CHCl
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which of the following alkyl halides is most likely to undergo rearrang…
2 - chloro - 3,3 - dimethylpentane
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1 multiple choice 2 points which of the following is a vicinal dihalide…
cis - 1,2 - dibromocyclopentane
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9. when a stretched spring is released, its potential energy becomes: a…
9. A. Kinetic energy 10. B. Potential energy 11. A. Kinetic energy 12. B. High potential energy 13. A. Potential energy decreases, kinetic energy increases 14. A. A diver jumping …
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complete the following table. be sure each of your answer entries has t…
| food | energy content when eaten | | ---- | ---- | | a cup of cooked green peas | \(125\ kcal\), \(523\ kJ\) | | a raw carrot | \(3.00\times 10^{4}\ cal\), \(126\ kJ\) | | a cho…
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write the condensed (noble - gas) electron configuration of sn. for mul…
\([Kr]5s^{2}4d^{10}5p^{2}\)
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write the complete ground - state electron configuration of rb+.for mul…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}4p^{6}\)
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write the complete ground - state electron configuration of ag+. for mu…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}4d^{10}\)
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write the complete ground - state electron configuration of ti²⁺. for m…
\( 1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{2}\)
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multiply or divide the following measurements. be sure each answer you …
$12.5\space\frac{mol}{L}$; $270\space cm^{2}$; $2500\space\frac{mol}{L}$
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multiply or divide the following measurements. be sure each answer you …
\(2.7\times 10^{3}\ cm^{2}\), \(3.6\times 10^{3}\ mol\), \(19.92\frac{mol}{L}\)
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multiply or divide the following measurements. be sure each answer you …
\(580\frac{g}{mL}\), \(9.39\frac{mol}{L}\), \(3.57cm^{2}\)
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using the table of standard formation enthalpies that youll find under …
$-1454$
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there are two steps in the usual industrial preparation of acrylic acid…
\(-470\space kJ\)
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a chemist measures the enthalpy change \\( \\delta h \\) during the fol…
| reaction | \(\Delta H\) | |--|--| | \(Mg(NO_3)_2(s)+H_2(g)\to2HNO_3(l) + Mg(s)\) | \(443\space kJ\) | | \(6HNO_3(l)+3Mg(s)\to3Mg(NO_3)_2(s)+3H_2(g)\) | \(-1329\space kJ\) | | \(…
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write the complete ground - state electron configuration of al³⁺. for m…
\(1s^{2}2s^{2}2p^{6}\)
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write the condensed (noble - gas) electron configuration of cu²⁺. for m…
[Ar]3d⁹
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write the complete ground - state electron configuration of titanium. f…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}\)
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write the complete ground - state electron configuration of potassium. …
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}\)
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write the condensed (noble - gas) electron configuration of cesium. for…
\([\text{Xe}]6s^1\)
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write the complete ground - state electron configuration of f⁻. for mul…
\(1s^22s^22p^6\)
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convert the following measurement. 5.5×10² g/(mol·l) = □ kg/(mol·dl)
\(5.5\)
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une entreprise fait la promotion dune toute nouvelle boisson santé « sa…
\(2.85\) cuillères à thé ### b)
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periodic table practice: use a periodic table to answer the following q…
- 15. An element consists of one type of atom; a compound is a chemical combination of different elements. - 16. A mixture combines substances without chemical bonding (e.g., air)…
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9. the periodic table groups elements with similar ______________ toget…
- 9. b) Properties - 10. b) An element - 11. b) The number of protons - 12. c) The total number of protons and neutrons - 13. b) An element in Group 1 (Alkali Metals) - 14. b) Ele…
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a chemist puts 0.4 liters of liquid in each of 10 beakers. how much liq…
4
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gemi is a member of a small indonesian tribe. she works ten hours a day…
- First question: Mechanical solidarity - Second question: Societies that relied on production of material goods
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49. define balan/itis. inflamed uterus inflamed vagina inflamed fallopi…
49. inflamed glans penis or glans clitoris 50. Chemotherapy
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c. why do you think cooks produce so many colloids? what makes colloids…
Cooks produce many colloids because they offer desirable textures (smooth, creamy, fluffy etc.), appealing visual appearances, and can enhance flavor distribution and retention, m…
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3. traditional cooking uses chemistry. molecular gastronomy takes the c…
Mayonnaise is a colloid because it has oil droplets (dispersed phase) uniformly distributed in water (dispersion medium), stabilized by emulsifiers like lecithin. The particles ar…
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a. what makes yogurt a colloid? what kind of a colloid is yogurt? (3 po…
Yogurt is a colloid because it has casein proteins and fat globules dispersed in water (dispersed and continuous phases). It is a liquid - in - liquid colloid (emulsion).
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balance the equations below. show your work. 1) ___ n₂ + ___ h₂ → ___ n…
1. \(1N_2+3H_2 = 2NH_3\) 2. \(2KClO_3=2KCl + 3O_2\) 3. \(2NaCl+F_2 = 2NaF+Cl_2\) 4. \(2H_2+O_2 = 2H_2O\) 5. \(Pb(OH)_2 + 2HCl=2H_2O+PbCl_2\) 6. \(2AlBr_3+3K_2SO_4 = 6KBr+Al_2(SO_4…
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decide whether these proposed lewis structures are reasonable. proposed…
- For the first structure: Yes. - For the second structure: Yes. - For the third structure: No, it has the right number of valence electrons but doesn't satisfy the octet rule. Th…
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4. zinc phosphide, zn₃p₂, is often used as a rat poison. phosphorus has…
2 ### Question 5
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3. a user is constructing an ionic bond between beryllium and chlorine …
Add another chlorine atom.
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highlight all the words that make up the appositive phrase. the chemist…
Professor Ramirez
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highlight all the words that make up the appositive phrase. the brainy …
Professor Apple
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choose all items that conservations might consider. mark all correct an…
a. Color and pigment variations, b. Chemical composition, c. Method of storage, d. Age of item, e. History surrounding the piece of art
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which of the following statements are true? check all that apply. view …
There are gas molecules that move faster than the average, The average kinetic energy of gas molecules increases with increasing temperature, The average speed of gas molecules in…
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lithium reacts with nitrogen gas according to the following reaction: 6…
\(0.107\space g\)
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read the lines from act i, scene v of romeo and juliet. romeo: to julie…
Romeo's lines make up one quatrain, which uses an abab rhyme scheme.
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missed this? read section 6.6 (page), watch kcv 6.6 a 280 - ml flask co…
$P_{He}=277$ torr $P_{Ar}=453$ torr
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missed this? read section 6.6 (page); watch kcv 6.6 a gas mixture with …
\(0.614\ g\)
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write a balanced neutralization equation between nitric acid and magnes…
$\ce{2HNO3 + Mg(OH)2 = Mg(NO3)2 + 2H2O}$
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the hydrogen concentration of a solution whose hydroxide concentration …
\(1.76\times 10^{-8}\)
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10 the hydroxide concentration of a solution whose hydrogen concentrati…
\(2.63\times 10^{-5}\)
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question 10 in the equation h2co3 + naoh → nahco3 + h2o, what is h2co3?…
A. An acid