化学
化学反応、化学量論、分子構造、元素の性質。
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how many neutrons does the isotope used to treat thyroid cancer contain…
- Atomic mass: \(22.99\) - Mass number: \(24\) - Difference: \(24 - 22.99=1.01\)
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which of the following is the formula to calculate the partial pressure…
A. \(P_{\text{gas}} = X_{\text{gas}}\times P_{\text{total}}\)
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in a neutral atom, the number of protons are equal to the number of ele…
True
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when a spring is compressed, the energy changes from kinetic to potenti…
work
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which two types of potential energies would be types of mechanical ener…
elastic and gravitational
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simone created a chart to summarize the energy transformations that tak…
kinetic energy transformed to mechanical energy
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how many protons are in this atom? ne
10
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when javier touches a hot mug of tea, energy is transferred from the su…
thermal
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humans started to master the process of smelting iron ores to turn into…
\(55.94\space amu\)
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two examples of energy transformations are shown. the energy transforma…
C. result in radiant energy.
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during early research in nuclear energy, why were scientists surprised …
All known changes always started and ended with the same amount of mass.
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humans started to master the process of smelting iron ores to turn into…
The atomic mass of iron is closest to the mass number of \(^{56}\text{Fe}\) because \(^{56}\text{Fe}\) has the highest percent abundance (\(91.8\%\)) among the iron isotopes. In t…
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four of the following compounds are structural isomers. which one is no…
\(CH_3C(CH_3)C(CH_3)CH_3\)
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which element is a row 5 transition element? ir sr co mo
Mo
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which of the following elements do you expect to be most like magnesium…
Calcium
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classify each of the following as a halogen, a noble gas, or neither. d…
- **Halogen**: \(Cl\), \(F\) - **Noble gas**: \(Kr\), \(He\) - **Neither**: \(Ga\)
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what is the subscript of c in the following chemical formula? c₆h₁₂o₆ 6…
6
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how many elements are in the following chemical formula? c₆h₁₂o₆ 6 3 12
3
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missed this? watch iwe 4.9; read section 4.9. you can click on the revi…
Atomic mass = \(79.9\) For Part B, referring to the periodic table, the element with an atomic mass of approximately \(79.9\) amu is \(Br\) (bromine).
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early discovery and development of isotopes for well over a century, sc…
Atomic Number: 6, Mass Number: 14, # Protons: 6, # Neutrons: 8
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what is the subscript of o in the following chemical formula? c₆h₁₂o₆ 3…
6
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a fictitious element is composed of isotopes a and b with masses of 61.…
The natural abundance of isotope B must be greater than the natural abundance of isotope A.
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correct the false sentences from the part a. the $\\ce{mg^{2+}}$ ion co…
The \(Mg^{2 + }\) ion contains 12 protons and 10 electrons.
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determine whether each of the following is true or false. check all tha…
The true statements are: "The \(I^{-}\) ion contains 53 protons and 54 electrons" and "The \(O^{2 -}\) ion contains 8 protons and 10 electrons". For the correction of the \(Ti^{2+…
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determine whether each of the following is true or false. check all tha…
The \( \text{I}^{-} \) ion contains 53 protons and 54 electrons (True). The \( \text{O}^{2-} \) ion contains 8 protons and 10 electrons (True).
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what is the mass number of an ion with 104 electrons, 159 neutrons, and…
\(264\)
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what is the charge of the cr ion that contains 21 electrons? 2- 2+ 3- 3+
3+
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an ion composed of which of these particles would have a mass of approx…
8 protons, 8 neutrons, and 6 electrons
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on the basis of rutherfords experimental observations, which of the fol…
- B. In an atom, most of the mass and the positive charge are located in a small core within the atom called the nucleus. - C. In an atom, negatively charged electrons are dispers…
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in 1909, ernest rutherford performed an experiment to explore the atomi…
- The atom contains a positively charged nucleus. - A positive charge is condensed in one location within the atom. - The majority of the space inside the atom is empty space.
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sonnet 116 by william shakespeare let me not to the marriage of true mi…
ABAB
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what is the aesthetic impact of a poem? (1 point) the central message o…
how the poem affects the reader's senses
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11) when jj thomson did his cathode ray tube experiment, what led him t…
11) a 12) d 13) b 14) c 15) a
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1) what neutral element has an electron configuration of 2 - 3? a) boro…
1. A. Boron 2. B. \(2 - 5\) 3. A. Proton = 1, Neutron = 1, Electron = 0 4. B. Protons and Neutrons 6. C. 14 7. B. Beryllium 8. D. Proton = +1, Neutron = 0, Electron = -1 9. D. In …
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review the lab report conclusion and then answer the question. based on…
to record an experiment and demonstrate learning
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a sample of ethanol (c₂h₆o) has a mass of 0.2301 g. complete combustion…
\(6.52\ kJ\)
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which is not true about irritant dermatitis? caused by a substance that…
It involves the patient's immune system.
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each row of the table below describes an aqueous solution at about 25 °…
| solution | \([H_3O^+]\) | pH | | ---- | ---- | ---- | | A | \(2.0\times 10^{-10}\space mol/L\) | \(9.70\) | | B | \(8.3\times 10^{-8}\space mol/L\) | \(7.08\) | | C | \(7.0\time…
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fill in the boxes for the coefficient and subscripts to make the formul…
4) \(\boxed{5}BaC_{\boxed{4}}H_{\boxed{4}}O_{\boxed{6}}\) 5) \(\boxed{4}Cu(HSO_{\boxed{3}})_{\boxed{2}}\) 6) \(\boxed{3}(NH_{\boxed{4}})_{\boxed{2}}Cr_{\boxed{2}}O_{\boxed{7}}\)
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1) hg is the symbol for the element: 2) write a chemical formula that s…
1. Mercury 2. \(3H_2O\)
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fill in the left side of this equilibrium constant equation for the rea…
\(\frac{[H_{2}PO_{4}^{-}][H_{3}O^{+}]}{[H_{3}PO_{4}]}\)
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29) 5al₂(sio₃)₂ al =_____ si =_____ o =_____ 30) 4au(io₃)₃ au =_____ i …
29) \(Al = 10\), \(Si = 10\), \(O = 30\) 30) \(Au = 4\), \(I = 12\), \(O = 36\) 31) \(S = 1\), \(Br = 2\) 32) \(Ca = 4\), \(O = 8\), \(H = 8\) 33) \(Mg = 15\), \(P = 10\), \(O = 4…
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fill in the left side of this equilibrium constant equation for the rea…
\(\frac{[H_{3}O^{+}][HCO_{3}^{-}]}{[H_{2}CO_{3}]}\)
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fill in the left side of this equilibrium constant equation for the rea…
\(\frac{[H_3O^{+}][F^{-}]}{[HF]}\)
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fill in the left side of this equilibrium constant equation for the rea…
\(\frac{[H_3O^{+}][CN^{-}]}{[HCN]}\)
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fill in the left side of this equilibrium constant equation for the rea…
\(\frac{[NO_2^-][H_3O^+]}{[HNO_2]}\)
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section c: identify the number of atoms of each element in the followin…
19) \(K = 8\), \(C=4\), \(O = 12\) 20) \(K = 2\), \(C = 1\), \(O=3\) 21) \(N = 12\), \(O=30\) 22) \(Cl = 16\), \(O = 8\) 23) \(Ca=1\), \(C = 4\), \(H=6\), \(O = 4\) 24) \(Na=12\),…
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17) c₄h₈fcooh # of molecules:______ # of elements:______ name of elemen…
17) - # of molecules: \(1\) - # of elements: \(4\) - Name of element: \(C\), # of atoms: \(5\); \(H\), # of atoms: \(9\); \(F\), # of atoms: \(1\); \(O\), # of atoms: \(2\) - Tota…
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13) co₂ # of molecules:______ # of elements:______ name of element: # o…
13) - # of molecules: \(1\) - # of elements: \(2\) - Name of element: Carbon (\(C\)) - # of atoms: \(1\); Oxygen (\(O\)) - # of atoms: \(2\) - Total # of atoms: \(3\) - The #2 is …
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dawn schmidt is a chemist. she needs to prepare 36 ounces of a 10% hydr…
The amount of \(9\%\) acid solution is \(32\) ounces and the amount of \(18\%\) acid solution is \(4\) ounces.
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doreen schmidt is a chemist. she needs to prepare 36 ounces of a 10% hy…
\(4\) ounces.
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15. ** which set of quantum numbers depicts an electron in a \d\ subshe…
A. \(n = 3\), \(l = 2\), \(m_l=1\), \(m_s=\frac{1}{2}\)
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draw the lewis dot diagram for a al^{-} anion.
\(\text{Al}\cdot\cdot\cdot\cdot\) (where the four dots represent the four valence electrons of the \(\text{Al}^{-}\) anion)
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6. determine the empirical and molecular formulas of caffeine. its mola…
The empirical formula of caffeine is \(C_4H_5N_2O\) and the molecular formula is \(C_8H_{10}N_4O_2\)
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20. choose the best answer. two elements have an electronegativity diff…
ionic
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which of these make the best conductors of electricity? ionic bonding m…
1. metallic bonding 2. polar covalent
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16. choose the best answer. two elements have an electronegativity diff…
16. nonpolar covalent 17. cations
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14. choose the best answer. ____ refers to any attractive force that ho…
14. Chemical bond 15. Ionization
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which of these forces/bonds is the weakest? metallic bonding dipole - d…
1. dispersion forces 2. Ionic bond
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10. choose all that apply. the attraction that a pair of bonding valenc…
10. - the number of protons in the nucleus - shielding provided by inner electrons - the distance of the valence electrons from the nucleus 11. a covalent compound with hydrogen b…
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8. choose the best answer. which of these will form a compound with the…
8. ionic bonding 9. solid
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6. choose the best answers using a periodic table. which type of bond i…
6. covalent bond 7. anions
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4. choose the best answers using a periodic table. which type of bond i…
4. metallic bond 5. ionic bond
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1. choose the best answers using the image. which type of force does a …
intramolecular
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a gas made up of atoms escapes through a pinhole 1.40 times as fast as …
\(\text{Ne}\)
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a 6.00 l tank at 6.08 °c is filled with 7.16 g of dinitrogen monoxide g…
$0.957\ atm$
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a 6.00 l tank at 6.08 °c is filled with 7.16 g of dinitrogen monoxide g…
\(0.947\space atm\)
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a 5.00 l tank at 19.4 °c is filled with 18.5 g of carbon dioxide gas an…
- Carbon dioxide: \(0.839\) - Sulfur hexafluoride: \(0.161\)
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combustion of hydrocarbons such as methane (ch₄) produces carbon dioxid…
\(CH_{4}(g)+2O_{2}(g)=CO_{2}(g)+2H_{2}O(g)\) ### 2. Volume of \(CO_{2}\) produced
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calculate to three significant digits the density of dinitrogen monoxid…
\(1.77\)
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carbon dioxide gas is collected at 13.0 °c in an evacuated flask with a…
mass: \(8.63\ \text{g}\) mole: \(0.196\ \text{mol}\)
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for many purposes we can treat butane $(c_{4}h_{10})$ as an ideal gas a…
yes, \(-168^{\circ}\text{C}\)
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an arctic weather balloon is filled with 14.3 l of helium gas inside a …
$13.9\text{ L}$
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the typical pressure of carbon dioxide in an unopened soda can is 3.45 …
\(350\)
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sometimes in lab we collect the gas formed by a chemical reaction over …
\(0.071\space g\)
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combustion of hydrocarbons such as methane (ch₄) produces carbon dioxid…
\(CH_{4}(g)+2O_{2}(g)=CO_{2}(g)+2H_{2}O(g)\) ### 2.
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a sample of an unknown compound is vaporized at 140. °c. the gas produc…
\(34.1\,\text{g/mol}\)
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dinitrogen difluoride gas is collected at 11.0°c in an evacuated flask …
mass: \(15.3\ g\) mole: \(0.231\ mol\)
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for many purposes we can treat dimethyl ether (c₂h₆o) as an ideal gas a…
yes, \(-187^{\circ}C\)
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an arctic weather balloon is filled with 2.59 l of helium gas inside a …
$2.60\text{ L}$
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the partial pressure of argon in the atmosphere is 0.946 kpa. calculate…
\(0.00934\)
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the partial pressure of argon in the atmosphere is 0.946 kpa. calculate…
\(0.00934\ atm\)
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an atom is the smallest particle in an element that retains the charact…
True
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the valence shell in a silicon atom has the number designation of selec…
B. 3
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the nucleus of an atom can contain select one: o a. electrons and neutr…
B. protons and neutrons
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each atom in a silicon crystal has select one: o a. four valence electr…
A. four valence electrons
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every known element has select one: o a. several different types of ato…
B. a unique type of atom
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an atom consists of select one: o a. one nucleus and only one electron …
D. answers (b) and (c)
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valence electrons are select one: o a. in various orbits around the nuc…
C. in the most distant orbit from the nucleus
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electrons are part of the nucleus of an atom. select one: true false
False
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an atom is the smallest particle in an element that retains the charact…
True
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valence electrons are select one: o a. in the most distant orbit from t…
A. in the most distant orbit from the nucleus
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an atom consists of select one: o a. one nucleus and only one electron …
D. answers (b) and (c)
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10. a compound contains an unknown element x. this element forms an oxi…
a. \(74.2\%\) b. Sodium (\(Na\)) (since the atomic mass of \(Na\) is approximately \(23\ g/mol\))
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electrons are part of the nucleus of an atom. select one: true false
False
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classify the molecules based on whether the molecule has a standard ent…
- $\Delta H_{f}^{\circ}$ is equal to zero: $I_{2}(s)$, $Cl_{2}(g)$, $Br_{2}(l)$, $Hg(l)$ - $\Delta H_{f}^{\circ}$ is not equal to zero: $Br_{2}(g)$, $I_{2}(g)$, $Br_{2}(s)$, $Hg(s…
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which of the substances have a standard heat of formation (δh°) of zero…
$O_{2}(g)$ at 25.0°C and 1 atm
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the reaction for the combustion of propane is mathrm{c}_{3} mathrm{h}_{…
$679$
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when methanol, ch₃oh, is burned in the presence of oxygen gas, o₂, a la…
\(35.9\space g\)
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given the thermochemical equations x₂ + 3y₂ → 2xy₃ δh₁ = -390 kj x₂ + 2…
\(-280\ \text{kJ}\)