化学
化学反応、化学量論、分子構造、元素の性質。
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lectron configuration of oxygen to explain why it tends to form a 2 - i…
The electron configuration of oxygen is \([He]2s^{2}2p^{4}\). By gaining two electrons to form the \(2-\) ion, the electron configuration of the oxygen ion becomes the same as a n…
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choose some examples of the explanatory power of the quantum - mechanic…
It explains periodic trends in ionization energy. It explains the chemical properties of the atoms, such as their tendency to gain or lose electrons.
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the electron configuration of calcium is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6…
all of the 4s electrons
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lets start with you determining the nuclear charge (z) for sc and ti. l…
For Sc, Z = 21. For Ti, Z = 22.
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3 multiple choice 1 point the total mass of living matter at each troph…
A. biomass
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part a use the periodic table to determine the element corresponding to…
Pt
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use the periodic table to determine the element corresponding to the el…
Au
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missed this? watch kcv electron configurations, iwe writing electron co…
[Ar]4s^23d^104p^4
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missed this? watch kcv: electron configurations. read sections 9.6, 9.7…
Part A: 1 Part B: 4
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write full electron configurations for b. express your answer in comple…
For B: \(1s^{\wedge}22s^{\wedge}22p^{\wedge}1\) For K: \(1s^{\wedge}22s^{\wedge}22p^{\wedge}63s^{\wedge}23p^{\wedge}64s^{\wedge}1\)
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when the amount of something remains the same over time, we say it is c…
C. the number of each type of atom
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according to the graph, which substance is the most soluble in water? w…
The most soluble substance is salt (\(NaCl\)), and the least soluble substance is benzoic acid (\(C_{6}H_{5}COOH\)).
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what information is given in a chemical equation? choose 2 answers: a t…
D. the new substances that formed, E. the substances present before the reaction
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test your knowledge 2 classify each substance as an element, compound, …
- \(CH_4\): Compound - Grape juice: Homogeneous mixture - \(KBr\): Compound - Oil and vinegar: Heterogeneous mixture - \(P\): Element
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complete the following statements. • in a chemical reaction, the atoms …
1. rearranged 2. different
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• homogeneous • immiscible • miscible • solubility • solute ______ is a…
1. Solubility 2. Solute 3. Miscible 4. Heterogeneous 5. Immiscible 6. Homogeneous
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the following chemical equation represents how plants make glucose and …
- In a chemical **equation**, the coefficients show how many copies of each substance are in the reaction. - The **subscripts** show how many atoms of each element are in a single…
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which of the following elements has the electron configuration of 3s²3p…
C. S
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how many valence electrons are in a chlorine atom? 17 1 7 10 none of th…
7
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samuel is sending a fancy organic fruit basket to his grandmother for h…
\(2.97x + 2.01y<26\)
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when matter changes ____, ____, or ____. examples: 1. breaking watermel…
1. Physical change 2. Physical change 3. Physical change 4. Physical change 1. Rusty car - Chemical change 2. Sodium metal and Chlorine gas react - Chemical change 3. Digesting fo…
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2. a. how can you tell if an atom has a negative charge? what type of i…
a. An atom has a negative charge when it has more electrons than protons. It is an anion. b. An atom has a positive charge when it has more protons than electrons. It is a cation.
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85. consider the phase diagram shown here. identify the states present …
- \(a\): Solid - \(b\): Liquid - \(c\): Gas - \(d\): Super - critical fluid - \(e\): Liquid - \(f\): Liquid and gas - \(g\): Solid, liquid, and gas
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answer the following questions: 1. define an ion. 2. a. how can you tel…
1. An ion is an atom or a group of atoms that has gained or lost one or more electrons, resulting in a net electric charge. 2. a. An atom has a negative charge when it has more el…
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83. how much heat (in kilojoules) is required to warm 10.0 g of ice, in…
\(30.5\space kJ\)
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report sheet lab moles and chemical formulas 11 a. finding the simplest…
Moles of Mg is approximately $6.63\times10^{-3}$ mole.
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1. for each of the positive ions listed in column 1, use the periodic t…
1. B. 10 2. D. 23 3. B. 10 4. H. 48 5. F. 25 6. E. 24 7. A. 2 8. C. 21 9. G. 36 10. I. 76
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1. define an isotope. 2. what would happen if the number of protons wer…
1. Atoms of the same element with different neutron numbers. 2. It becomes a different element. 3. Element name implies atomic number. 4. - a. Carbon - b. Atomic number - c. Mass …
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select the correct answer. lara is undergoing chemotherapy for breast c…
B. antiemetics
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some n₂ gas is mixed with some o₂ gas, and the sketch below shows a rep…
| gas | mole fraction | partial pressure | |---|---|---| | \(\ce{O2}\) | \(0.444\) | \(0.666\space atm\) | | \(\ce{N2}\) | \(0.556\) | \(0.834\space atm\) |
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an emergency breathing apparatus often placed in mines or caves works v…
\(27\space g\)
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an emergency breathing apparatus often placed in mines or caves works v…
\(2.7\times 10^{2}\ g\)
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part a the combustion of gasoline produces carbon dioxide and water. as…
\(12\space kg\)
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toilet bowl cleaners often contain hydrochloric acid to dissolve the ca…
$7.4\space g$
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missed this? watch kcv limiting reactant, theoretical yield, and percen…
Part B: \(16.75\ g\) Part C: \(67.5\%\)
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missed this? watch kcv limiting reactant, theoretical yield, and percen…
\(78.8\%\)
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missed this? watch kcv limiting reactant, theoretical yield, and percen…
\(HCl\)
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part a the theoretical yield of a reaction is 27.3 g and the actual yie…
$44.3\%$
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missed this? watch kcv: limiting reactant: theoretical yield and percen…
\(2.17\ g\)
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for the reaction shown, compute the theoretical yield of the product in…
\(2.17\ g\)
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missed this? watch kcv limiting reactant, theoretical yield, and percen…
\(1.3\ g\)
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part b how many moles of $o_{2}$ will be in the reaction vessel once th…
\(1.5\ mol\)
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question 43 a hemorrhagic disease was intentionally released by which g…
New Zealand farmers
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17. what is the name of fe2s3 (0.5 points) * enter your answer 18. what…
17. Iron(III) sulfide 18. Manganese(IV) chloride 19. Tin(II) oxide 20. Cobalt(III) sulfide
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missed this? watch kcv limiting reactant, theoretical yield, and percen…
\(1\) mol
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missed this? watch kcv limiting reactant, theoretical yield and percent…
\(1\space mol\)
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13. what is the name of cobr2 (0.5 points) * enter your answer 14. what…
13. Cobalt (II) bromide 14. Copper (II) nitride 15. Tin (IV) sulfide 16. Iron (III) nitride
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missed this? watch kcv: reaction stoichiometry, iwe: mass-to-mass conve…
Part A: $3.7\ g$ Part B: $0.10\ g$
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9. write the formula for chromium (iii) chloride (0.5 points) * enter y…
9. \(CrCl_{3}\) 10. \(Cr_{3}N_{2}\) 11. Nickel (III) sulfide 12. Vanadium (IV) phosphide
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5. write the formula for mercury (ii) bromide (0.5 points) * enter your…
5. \(HgBr_{2}\) 6. \(Cu_{2}O\) 7. \(CoCl_{3}\) 8. \(PbO_{2}\)
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1. write the formula for lead (ii) oxide (0.5 points) * enter your answ…
1. \(PbO\) 2. \(MnO\) 3. \(SnCl_{2}\) 4. \(Fe_{2}O_{3}\)
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noah and nina are 15 m apart in a closed room. noah says the same sente…
The second sound wave reflects off the walls of the room, so Nina is able to hear the sound.
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does the following text have an inappropriate shift in verb tense? if s…
In her chemistry demonstration, Dakota showed that at sea level, water without impurities boils at 100°C.
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question 37 select the incorrect statement? chemical hazards include pa…
Gentian violet is not used in human medicine
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consider the unbalanced equation for the combustion of butane c4h10(g) …
Part A: \(2C_4H_{10}(g)+13O_2(g)\to 8CO_2(g)+10H_2O(g)\) Part B: \(49\space mol\)
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missed this? watch kcv reaction stoichiometry. read section 8.3. you ca…
\(0.0441\space mol\)
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does the following text have an inappropriate shift in verb tense? if s…
I recently learned that the periodic table lists elements in order of increasing atomic number, from left to right and top to bottom.
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missed this? hatch kcc: reaction stoichiometry. read section 8.3. you c…
Part F: \(3.2\space mol\space H_2O\) Part G: \(0.0331\space mol\space CO_2\)
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calculate the change in internal energy if a system absorbs 1525 j of h…
- For the first question: - 329 J - For the second question: - 1915 J
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missed this? watch kcv reaction stoichiometry, read section 8.3. you ca…
Part A: \(12\space mol\space CO_{2}\) Part B: \(16\space mol\space H_{2}O\)
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elements, compounds, and mixtures heather brown checking comprehension …
Element
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calculate the change in internal energy if a system releases 25.5 j of …
\(q=-25.5\ \text{J}\) \(P\Delta V = 0.84\ \text{atm L}\) \(\Delta E=-110.6\ \text{J}\)
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elements, compounds, and mixtures heather brown checking comprehension …
Physical change
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elements, compounds, and mixtures checking comprehension types of matte…
Physical change
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elements, compounds, and mixtures heather brown types of matter: elemen…
C. either homogeneous or heterogeneous.
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elements, compounds, and mixtures heather brown types of matter: elemen…
Heterogenous
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which of the following matches the electronic configuration of a diamag…
D. \([Xe]6s^{2}4f^{14}5d^{10}6p^{6}\)
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which of the following matches the electronic configuration of a parama…
A. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{1}\)
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question 25 consumers can avoid gmo foods by buying organic? true false
True
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the speed of sound in ice, water, and steam is shown. what best explain…
Sound travels fastest in ice because energy is easier to transfer when the molecules are close together.
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determine the sign for q and w in the description below. a system relea…
For \(q\): negative (\(-\)), for \(w\): positive (\(+\)), \(\Delta E = 17\ \text{kJ}\)
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which of the following is the electronic configuration of indium, in? a…
E
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a sound wave travels through air. in which regions are air molecules th…
D. rarefactions
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kr 5s²4d⁶ is the electronic configuration for ag⁺². with what element i…
B. Rh
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to what element does the following electronic configuration belong? 1s²…
Br
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to what element does the following electronic configuration belong? xe …
Pb
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question 8 a 6.75 - l flask contains 6.49 mol he at 310°c. calculate th…
\(47.1\)
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what is the $m_s$ value (magnetic spin) for the electronic configuratio…
\(+\frac{1}{2}\)
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elements, compounds, and mixtures heather brown types of matter: elemen…
B. Chemical change
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what is the $m_s$ value (magnetic spin) for the electronic configuratio…
\(+\frac{1}{2}\)
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determine whether each of the following statements regarding real gases…
1. True 2. True 3. False 4. False 5. True
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elements, compounds, and mixtures heather brown types of matter: elemen…
B. Chemistry has occurred.
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what is the $m_{s}$ value (magnetic spin) for the electronic configurat…
\(+\frac{1}{2}\) and \(-\frac{1}{2}\) (but if we consider the options given and the fact that in a filled orbital, electrons have these two possible spin values. If we assume the …
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a physical change is when the chemical composition (such as h₂o) does n…
Boiling water, Chopping wood, Breaking glass.
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what is the $m_{s}$ value (magnetic spin) for the electronic configurat…
\(+\frac{1}{2}\)
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elements, compounds, and mixtures heather brown multiple-choice questio…
Solid
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which of the following sets of quantum numbers are not allowed. explain…
1 and 2
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elements, compounds, and mixtures heather brown types of matter. elemen…
Liquid
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given the following sets of quantum numbers for n i ml ms, which one of…
E. 5 2 3 ½
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question 3 calculate the root mean square speed of oxygen gas molecules…
\(502\) # Question 4
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when the temperature of a trapped sample of gas is increased at constan…
the average force of molecular collisions increases, the average frequency of molecular collisions increases, the average kinetic energy of the molecules increases, the pressure o…
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19) __ c₃h₈ + __ o₂ → __ co₂ + __ h₂o 20) __ ai(oh)₃ + __ hbr → __ aibr…
19) \(1C_{3}H_{8}+5O_{2}=3CO_{2}+4H_{2}O\) 20) \(1Al(OH)_{3}+3HBr = 1AlBr_{3}+3H_{2}O\)
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14) ___ cs + ___ n₂ → ___ cs₃n 15) ___ mg + ___ cl₂ → ___ mgcl₂ 16) ___…
14) \( 6\text{Cs}+\text{N}_2 = 2\text{Cs}_3\text{N} \) 15) \( \text{Mg}+\text{Cl}_2=\text{MgCl}_2 \) 16) \( 10\text{Rb}+2\text{RbNO}_3 = 6\text{Rb}_2\text{O}+\text{N}_2 \) 17) \( …
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order the elements s, cl, and f in terms of increasing atomic radii. s,…
F, Cl, S
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which element below has the highest electronegativity? p be b n c
N
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13) __ al + __ s₈ → __ al₂s₃ balancing chemical equations i 14) __ cs +…
\(16Al+3S_8 = 8Al_2S_3\)
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question 16 which element below has the largest atomic radius? f s b p n
P
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which of the following quantum number sets describes a 4f orbital? n=3,…
n = 4, l = 3, ml= + 2
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7) ___ n₂ + ___ o₂ → ___ n₂o₃ 8) ___ h₃po₄ + ___ mg(oh)₂ → ___ mg₃(po₄)…
7) \(2N_2+3O_2 = 2N_2O_3\) 8) \(2H_3PO_4+3Mg(OH)_2=Mg_3(PO_4)_2 + 6H_2O\) 9) \(2NaOH + H_2CO_3=Na_2CO_3+2H_2O\) 10) \(C_3H_8+5O_2 = 3CO_2+4H_2O\) 11) \(4Na+O_2 = 2Na_2O\) 12) \(2A…
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which of the following quantum number sets describes a 3d orbital? ( \b…
$n = 3,l = 2,m_l=-1$