化学
化学反応、化学量論、分子構造、元素の性質。
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question 1 2 pts 1. hydrogen bonds in water molecules are formed betwee…
hydrogen and oxygen atoms of adjacent molecules.
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1. what is a drug? * a chemical substance, natural or human made, that …
All of the above.
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multiple - choice question why do both nuclear and chemical changes occ…
To make atoms more stable
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how many chemicals in tobacco products have been proven to cause cancer…
B. 60
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fairfax assembly paint booth cleaning at gms fairfax assembly plant, pa…
Using fewer chemicals reduces pollution as well as improves efficiencies in manufacturing.
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question 9 1 pts what type of reaction is mnso₄→mno + so₃? combustion d…
decomposition # Question 10
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hydrogen, when combined with oxygen in a chemical reaction, forms water…
- First question: synthesis - Second question: The reaction has more than one product.
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question 5 what type of chemical reaction is: 4fe + 3o₂ → 2fe₂o₃? decom…
- Question 5: synthesis - Question 6: heat and light
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question 3 what does the law of conservation of mass say? the mass of t…
The mass of the products in a chemical reaction is equal to the mass of the reactants. ### Question 4
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methane burns in oxygen to yield carbon dioxide and water. the chemical…
1. C. carbon dioxide and water 2. A. ammonia
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the efficiency of the endocrine system as a whole gradually declines in…
1. female 2. stress 3. equilibrium 4. cancer 5. diabetes (corresponding to the third option: 1. female 2. stress 3. equilibrium 4. cancer 5. diabetes)
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if a double replacement reaction between two aqueous solutions does not…
- First question: No reaction occurs - Second question: The cations and anions switch partners
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what indicates that a double replacement reaction has occurred? bubbles…
- First question: Formation of a solid precipitate, water, or a gas. - Second question: These reactions indicate a successful double replacement reaction has occurred. - Third que…
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which gas will relight a glowing splint when tested? oxygen nitrogen ca…
- First question: Oxygen - Second question: It turns pink
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what reaction type occurs when ethanol reacts with oxygen and releases …
- First question: Combustion - Second question: Potassium chlorate - Third question: Sodium and water
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what type of reaction occurs when magnesium reacts with oxygen to form …
- Question 1: Synthesis - Question 2: A reactivity series - Question 3: Decomposition
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3. what is the mass of a 15ml sample of mercury?(density of mercury is:…
The mass of the \(15mL\) sample of mercury is \(203.25g\).
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if you measured out 0.200 moles of nacl, and dissolved it in 0.500 l so…
For the first question: \(0.400\space M\) For the second question: \(0.0200\space M\)
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if you weighed out 25.0 g of nacl, how many moles of nacl would you hav…
For the first question: \(0.428\space mol\) (but the options have unit errors as the question asks for moles but options have grams. Assuming it's a typo and based on calculation …
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le 2 novembre, au mexique, les gens célèbrent le jour des morts, cest u…
- **Quelle fête est décrite dans le texte, donne son nom en français et en espagnol.** Le nom français est "le jour des morts" et le nom espagnol est "El día de los muertos". - **…
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unit 3 college board questions a student placed a sample of a food colo…
45. B. The dyes will pass through the column at a slower rate because \(CH_3OH(l)\) is a less polar solvent than water. 46. C. Boiling the mixture and condensing and collecting th…
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read the text. during world war i, british and american warships were a…
problem - solution
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40. fe³⁺(aq) + kscn(s) → fescn²⁺(aq) + k⁺(aq) to determine the moles of…
C. \(4\times 10^{-6}\space mol\)
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which of the lewis structures in the image is correct?
D.
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which of the lewis structures in the image is correct?
A. Option Text
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which of the lewis structures in the image is correct?
D
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miaprep.com mlaprep - all lessons covalent bonding and molecules 3 more…
B. Molecule names use prefixes to denote how many atoms of each element are needed.
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25. a sample of an unknown gas from a cylinder is collected over water …
D. mass of the water in the apparatus
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which of the lewis structures in the image is correct?
A. Option A's Lewis structure is correct.
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12 hydrogen is the only non - metal in group 18 a false b true
A. False
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using the model and a periodic table, answer the following questions. 9…
B. 4
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8 what classification does the element in group 15 period 5 fall into a…
B. Metalloid
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7 atoms of elements in the same group of the periodic table share the s…
C. number of valence electrons
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6 the elements in the halogen group include the following a fluorine, c…
A. Fluorine, Chlorine, Bromine, Iodine, and Astatine
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5 what element is in group 12 period 6 a zn b h c au d hg
D. Hg
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4 identify the element with the least electronegativity a zinc (zn) b c…
B. Calcium (Ca)
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3 ionization energy increases: a up and right b the closer you get to t…
A. Up and Right
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3d n= 3d ε= the possible values of me for the 3d subshell are -2,-1,0,+…
\(n = 3\) \(\ell=2\) A. \(-2,-1,0,+1,+2\)
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2 identify the element with the greatest reactivity between fluorine (f…
B. Fluorine (F)
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question 12 of 18 give the chemical symbol for the element with the gro…
symbol: \(V\) \(4s\) \(n = 4\) \(4s\) \(\ell=0\) The possible values of \(m_{\ell}\) for the \(4s\) subshell is \(0\)
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unit 3 college board questions 20. which of the following best helps to…
20. B. \(HCN\) is polar, whereas \(N_2\) is nonpolar. 21. D. \(MgO(s)\) consists of separate \(Mg^{2 + }\) ions and \(O^{2-}\) ions held in a fixed lattice, but in \(MgO(l)\) the …
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write the ground state electron configuration of br using the noble - g…
\([Ar]4s^{2}3d^{10}4p^{5}\)
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complete the electron configuration for n. electron configuration: he
\(2s^{2}2p^{3}\)
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unit 3 college board questions 18. the molecular formula and molar mass…
18. B. \(C_{4}H_{10}\), because it has more electrons, resulting in greater polarizability and stronger dispersion forces 19. B. Butane \(<\) acetone \(<\) 1 - propanol
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question 9 of 18 give the full electronic configuration for phosphorus.…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}\)
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question 8 of 18 write the full electronic configuration for lead (pb).…
\(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{2}4f^{14}5d^{10}6p^{2}\)
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14. if the pressure of each gas is increased at constant temperature un…
14. C. Butane 15. B. \(CS_2(l)\), because it has weaker London dispersion forces 16. A. The London (dispersion) forces increase 17. D. Compound 2, because it forms hydrogen bonds,…
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10. which of the following best helps to explain why hexane has a highe…
D. \(I_{2}\) will be found mainly in the top layer because it will dissolve more in the \(C_{6}H_{14}(l)\) # 12.
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but the element symbols in the boxes which rank them from lowest to hig…
\(B<Al < Ca<K\)
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often, to find breaks in trends and to understand why there are excepti…
[A. [He]2s² 2p³]
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5. consider the molecules represented above and the data in the table b…
- Question 5: C. The carbon chains are longer in nonane than they are in 2,3,4 - trifluoropentane. - Question 6: D. \(CH_2F_2(l)\) - Question 7: C. Hydrogen bond
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unit 3 college board questions 3. the diagram above is a molecular mode…
- Question 3: D. It does not show how the temporary fluctuating dipoles of the molecular electron clouds result in a net force of attraction between the molecules. - Question 4: B…
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unit 3 college board questions 3. the diagram above is a molecular mode…
D. It does not show how the temporary fluctuating dipoles of the molecular electron clouds result in a net force of attraction between the molecules.
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if a halogen releases energy when it takes the electron on, which state…
The process is exothermic and the sign of $\Delta H$ is negative.
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in a laboratory, emma poured a chemical down the drain. while doing so,…
She feared that people would discover why she got an injury.
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i am about to tell you, but read it off the graph. as you go down the g…
IE decreases down the group.
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read the graph. what is happening to the ionization energy, in general,…
IE increases, in general
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consider an element with the following ionization energy values. ie₁: 7…
The element has 5 valence electrons.
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part 1 where will the shared electrons in the covalent bond spend more …
- Part 1: closer to oxygen - Part 2: Yes. Oxygen will have a partial negative charge and carbon will have a partial positive charge. - Part 3: Polar, because the electrons are sha…
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the diagram below shows part of a molecule that is found in proteins. w…
- The structure on the left is a base. - The structure on the left accepts a proton (\(H^+\)) when placed in water.
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the diagram below shows part of a molecule that is found in proteins. w…
- The structure on the left is an acid. - The structure on the left releases a proton (\(H^{+}\)) when placed in water.
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the diagram below represents three water molecules interacting. five di…
Arrow 2, Arrow 3, Arrow 4, Arrow 5
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imagine one of your colleagues is confused about how to tell whether an…
whether the atom has unpaired electrons in its outer electron shell
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which statements correctly describe the relationship between oxygen, hy…
- First statement: Water contains two covalent bonds, but a single hydrogen atom has no covalent bonds. - Third statement: Hydrogen is one type of atom found in a water molecule. …
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read the scenario below and answer the question that follows. randy was…
C. misinformation effect
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if a process equires energy\... it is endothermic and the δh value is p…
It is endothermic and the $\Delta H$ value is positive.
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2. if 93.5 cm of mg ribbon has mass 1.473 g, calculate the length of ri…
\(3.4\) cm
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while mary was at the store, she pictured her dog eating food out of a …
D. link method
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which of the following is the shorthand electron configuration of just …
\[ [Ar]4s^{2}3d^{6} \]
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pre - lab questions answer the following questions after you have read …
The new pressure is $0.374\ \text{atm}$.
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is the electron configuration of v the same as the electron configuruat…
no
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pre - lab questions answer the following questions after you have read …
The new pressure \( P_2 = 0.374\) atm.
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which of the following is a cation that is isoelectronic with f^- and o…
E. Both B. and C.
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pre - laboratory assignment 1. read an authoritative source for a discu…
(1) Hot water: $-4.34^{\circ}C$, Cold water: $3.81^{\circ}C$ (2) $-907J$ (3) $800J$
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pre - laboratory assignment 1. read an authoritative source for a discu…
hot water: $- 4.34^{\circ}C$ cold water: $3.81^{\circ}C$
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9. moles of salt (anhydrate) (show calculations.) 10. ratio of moles of…
\[MgSO_{4}\cdot7H_{2}O ightarrow MgSO_{4}+7H_{2}O\]
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which is not a description of carbon monoxide gas? colorless visible od…
visible
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b_18 ionic radii which would have the largest radius? smallest rad larg…
D. \(S^{2-}\) (Largest), \(Ca^{2+}\) (Smallest)
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which would have the larger radius? f f
\(F^-\)
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which would have the larger radius? li li+
Li
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(a couple of quick factoids, unrelated to the los you should focus on. …
- The hydrocarbon chains of waxes are saturated; those found in oils are not. - The hydrocarbon chains of waxes are longer than the chains found in oils.
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this question has 2 parts. the type of bond that is formed when atoms o…
1. Ionic bond 2. when two polar molecules come into close proximity.
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which of the following is paramagnetic? fe³+ zn ag+ cl¯
\(Fe^{3 +}\)
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the type of bond that is formed when atoms of opposite charges interact…
- First question: Ionic bond - Second question: when two polar molecules come into close proximity. - Third question: Oxygen is more electronegative than hydrogen. In \(H_2O\), ox…
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note that pure water is neutral in terms of ph—its halfway between stro…
- First question: It is basic, meaning that it contains a very low concentration of protons (\(H^{+}\)). - Second question: An atom or molecule that gains a proton.
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what is the (ground state) electron configuration of fe^{3+}? a. ar4s^{…
D. \([Ar]3d^{5}\)
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part a order the elements sr, ca, and se in order of decreasing atomic …
Sr > Ca > Se
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your etext choose the element with the higher ionization energy from ea…
- Part A: Al - Part B: Cl
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choose the correct trend in ionization energy ionization energies decre…
- For ionization energy: Ionization energies increase going across a row in the periodic table from left to right; it decreases going down a column. - For atomic size: atomic size…
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which of the following atoms has the least metallic character? rb k cs …
Li
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which of the following atoms is the largest? u k na cs rb
Cs
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which of the following elements has the lowest ionization energy? c ne …
Rb
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an asymmetry in the position of shared electrons in a bond, due to diff…
1. Polar covalent bond 2. Hydrogen bond 3. Electronegativity 4. Atom 5. Ion 6. Element 7. Covalent bond
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part a which of the atoms represented below is the smallest in size? ge…
C. C
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extension: the periodic table get the gizmo ready: • create a neutral h…
The periodic table has its shape because elements are grouped based on their electron configurations. Elements in the same column (group) have the same number of valence electrons…
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correct a neutral al atom has 13 electrons; an al³+ ion is formed when …
noble gases
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li*express your answer in complete form, in order of increasing orbital…
\(1s^{\wedge}2\) \(1s^{\wedge}22s^{\wedge}22p^{\wedge}6\)
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true or false the maximum number of electrons that can be placed in any…
true
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enter full electron configurations for each ion. part a f- express your…
Part A: \(1s^22s^22p^6\) Part B: \(1s^22s^22p^63s^23p^6\)
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the diagrams below add a little more detail — they show electrons, repr…
- First question: Diagram C, because oxygen is more electronegative than hydrogen. - Second question: Yes, because the electrons are shared unequally.