化学
化学反应、化学计量、分子结构与元素性质。
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this is the chemical formula for methyl tert - butyl ether (the clean -…
23.0 mol
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question hydrogen bonds are formed between hydrogen and: select the cor…
C. electronegative atoms
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hydrogen bonding is responsible for: select the correct answer below: t…
the unexpectedly high boiling points for hydrides in period two
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question examine the following substances and determine which box each …
| Substance | Intermolecular only | Intramolecular only | Neither intermolecular nor intramolecular | Both intermolecular and intramolecular | |--|--|--|--|--| | liquid oxygen | X…
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question what types of particles can participate in dipole - dipole int…
polar molecules
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question in general, the type and magnitude of intermolecular forces th…
A. physical properties
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which of the following will have a higher boiling point? select the cor…
A. $CHBr_3$
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the oxidation number of an atom in an elemental substance is ____. the …
D. zero; equals
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the chemical equation, h₂o --> h₂ + o₂ is ____. we can add coefficients…
A. unbalanced; 2; 2; 1
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question in order for a molecule to be polar, it must have: select the …
D. all of the above
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which molecule will have a net dipole? select the correct answer below:…
H₂S
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which molecule will have a net dipole? select the correct answer below:…
SO₂
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the image below represents a molecule that takes up a three - dimension…
The dipole moment is 0
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question noble gases do not receive electronegativity values because: s…
C. they have a full valence shell
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use the figure provided to determine which of the following describes m…
B. ionic
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question identify the compound with ionic bonds. select the correct ans…
AlBr₃
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question identify the compound containing polar covalent bonds. select …
B. $\mathrm{CCl}_{4}$
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use the figure provided to determine which of the following describes n…
C. polar covalent
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use the figure provided to determine which of the following has bonds w…
H₂O
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5. step and compare models: towards the bottom, in the middle of the sc…
i. In Rutherford's model, electrons are randomly placed; in Bohr's, they are in fixed orbits. ii. In Bohr's model, electrons have defined positions; in Heisenberg's, they are in a…
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question two atoms of the same element are most likely to form ________…
a non - polar covalent bond
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question which pair of elements will not form an ionic compound? select…
C. C and Br
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what is the lewis symbol for be^{2+}? select the correct answer below: …
O $\text{Be}^{2 +}$
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what is the lewis symbol for k+? select the correct answer below: o k+ …
K⁺
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what is the lewis symbol for k+?
$[\text{Ar}]$
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a lewis symbol that has a non - noble gas element and no dots represent…
A. cation
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question electrons on a lewis symbol will be arranged: select the corre…
C. one on every side before placing a second on any side
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1. there are two stable isotopes of chlorine, $^{35}cl$ (34.9688 u) and…
a) 17 b) 20 c) 4
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question covalent bonds are most commonly formed between: select the co…
nonmetals
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calculate the mass of tetraborane (b₄h₁₀) that contains a trillion (1.0…
$8.85\times 10^{-12}\text{ g}$
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question what results when two or more atoms share electrons equally? s…
molecular compounds
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calculate the number of vanadium atoms in a 140.0 g sample of vanadium(…
\(9.270\times 10^{23}\) atoms
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which of the following does not correctly pair the polyatomic ion with …
A. cyanide, $CN^{+}$
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the chemical formula for potassium bromide is kbr. a chemist determined…
8.33 g
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mgso₃ is called __________. select the correct answer below: o magnesiu…
D. magnesium sulfite
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a chemist measures the amount of iodine solid produced during an experi…
$0.261\ mol$
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a chemist determined by measurements that 0.0550 moles of silver partic…
$5.93\ g$
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which of the following correctly pair the polyatomic ion with its formu…
- A. cyanide, $CN^-$ - B. chlorate, $ClO_3^-$ - D. nitrate, $NO_3^-$
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ammonium hydroxide has the formula ______. select the correct answer be…
NH₄OH
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5. write the number of outer most electrons for each element. na____ mg…
Na: 1, Mg: 2, Al: 3, Si: 4, P: 5, S: 6, Cl: 7, Ar: 8
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methanol is in liquid form if its temperature is between - 94°c and. at…
-43°C, 0°C, 25°C
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question 24 (1 point) cobalt is element 27. cobalt - 60 is used in the …
B. 33 neutrons, 27 protons
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6. how many energy levels do each of the group 1 element have on their …
a. 1 b. 2 c. 3
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question 23 (1 point) isotopes have the: a) same number of protons but …
A. same number of protons but different number of neutrons
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question 22 (1 point) what is the electron arrangement for the first el…
(1)
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4. elements with a complete outer shell are located _____________. a. e…
a. 1 b. alkali metals
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which is not a chemical symbol? na cs n cs
D. CS
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which element is a transition metal? calcium oxygen iron iodine
C. Iron
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3. which elements had only one electron in their outer most shell? a. _…
a. Hydrogen (H) b. Lithium (Li) c. Sodium (Na)
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question 18 (1 point) which is true about subatomic particles? protons,…
Subatomic particles are smaller than atoms.
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2. what do you notice about the location of the elements in question #1…
a. 18 b. 18 c. Noble
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1. which elements had complete outer shells? either two or eight electr…
a. Helium (He) b. Neon (Ne) c. Argon (Ar)
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question 12 (1 point) which is not a physical change of water? liquid w…
Liquid water decomposes to hydrogen gas and oxygen gas.
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which element has the following ground state electron configuration? 1s…
A. Cl
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5. consider the following reaction: (ℓ) + 4.5 o₂ (g) → + 2 co₂ (g) + 2 …
a) \(44.1\%\) b) \(1.27\) c) \(93.75\%\) d) The reaction is not very green due to low atom - efficiency (\(44.1\%\)) and a non - negligible E - factor (\(1.27\)).
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question 10 (1 point) what is the atomic mass of an element? the mass n…
The weighted average atomic mass of all isotopes of an element
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how many groups are in the periodic table? 12 14 16 18
D. 18
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how was your selected vocabulary different from your partners? turning …
1. To find the rhyme - scheme, one must identify the end - sounds of the lines in the stanzas and assign a letter to each unique sound. For example, if the end - sounds of the fir…
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question 3 (1 point) a yellow liquid is found to be corrosive. how are …
B. The yellow color of the liquid is a physical property., C. The corrosive nature of the liquid is a chemical property.
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question 1 (1 point) which of the following are typically studied in ch…
C. Atoms and molecules
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question 17 which of the following statements regarding erythrocytes is…
C. Bilirubin from worn out erythrocytes is recycled by the liver.
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question 1 (1 point) if a compound were to form between na and n a) na …
B. N would form a 3 - charged ion
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25. using the key on the top - row of the picture shown below, (1) list…
A. (1) 2 atoms of one element, 1 atom of another element; (2) \(A_2B\) B. (1) 3 atoms of one element; (2) \(A_3\) C. (1) 1 atom of one element, 2 atoms of another element; (2) \(A…
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3. carbon disulfide (cs2) reacts with oxygen to form carbon dioxide and…
80 g
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read these lines: that conqueredst alexandria by the right of arms, and…
C. abaaaba
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chemistry quiz #2 - physical and chemical pro... 0:09:07 elapsed combin…
False True False False False
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2. 1.00 x 10² g of aluminum and 1.50 x 10² g of oxygen are reacted acco…
i. Mass of product ($Al_{2}O_{3}$): 189 g ii. Mass of Al: 0 g, Mass of $O_{2}$: 10.96 g
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changing the size and shapes of pieces of wood would be a chemical chan…
False False True True False
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chemistry quiz #2 - physical and chemical pro... water reacts with sodi…
- Water reacts with sodium metal: 2. Chemical Change - A solid is crushed into a powder: 1. Physical Change - Mixing salt and pepper: 1. Physical Change - Two chemicals are mixed …
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names & formulas for ionic compounds give the name or formula for the f…
1) Sodium carbonate 2) Sodium hydroxide 3) Magnesium bromide 4) Potassium iodide 5) Iron(II) chloride 7) Zinc hydroxide 8) Beryllium sulfate 9) Chromium(II) fluoride 10) Aluminum …
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a physical change is when the chemical composition (such as h2o) does n…
Breaking glass, Chopping wood, Boiling water
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highest lattice energy csbr licl lowest lattice energy answer bank mgs …
Highest lattice energy: $MgS$ Lowest lattice energy: $CsBr$
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classify each of the compounds as a molecule or a salt. molecule: c₃h₈,…
Molecule: $C_3H_8$, $SO_3$, $CH_2O$ Salt: $K_2CO_3$, $CaBr_2$, $NaCl$
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95. urea (ch₄n₂o) is a common fertilizer that can be synthesized by the…
Limiting reactant: $NH_3$ Theoretical yield of urea: $240.71\ kg$ Percent yield: $70.0\ \%$
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for each chemical formula write the chemical name in the blank as use b…
| Chemical Formula | Chemical Name | | ---- | ---- | | $\text{Na}_3\text{P}$ | Sodium phosphide | | $\text{Al}_2\text{O}_3$ | Aluminum oxide | | $\text{Li}_2\text{S}$ | Lithium su…
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read these lines from \the monks tale.\ for hercules, a victor of sover…
D. abcd
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question 9 of 10 read this poem: roses are red, violets are blue, dodoe…
A. abba
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determine whether each statement is true or false. adhesion is an attra…
1. True 2. False 3. True 4. False 5. True
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adhesive forces between water molecules and glass molecules help water …
Water molecules are held together by hydrogen bonds as they rise in a capillary tube. Water rises farther in a narrow glass tube than in a wide glass tube.
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a scoop - shaped concave meniscus forms when adhesive forces between a …
Oil: Adhesive and cohesive forces are equal. Water: Adhesive forces are greater than cohesive forces. Mercury: Cohesive forces are greater than adhesive forces.
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true or false: nacl is a molecule. 36/40
FALSE
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test your knowledge 3 label the image of the bomb calorimeter.
From left - to - right and top - to - bottom (assuming typical placement): 1. Stirrer (not in the list but often present for even heat distribution, if we must choose from the lis…
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in the reaction: c₄h₆o₄ + fad → c₄h₄o₄ + fadh₂, what type of reaction t…
C. Dehydrogenation
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fill in the blank question muscle fibers that have an abundant blood su…
slow
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fill in the blank question muscle fibers that have an abundant blood su…
slow
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which is a complete sentence? you must be going somewhere nice your out…
Two hydrogen atoms and one oxygen atom compose each molecule of water.
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fill in the blank question muscle fibers that have an abundant blood su…
slow
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match the principal shell number to the maximum number of electrons tha…
$n = 1$: 2 $n = 2$: 8 $n = 3$: 18 $n = 4$: 32 $n = 5$: 50
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state whether the statement about the relative potential energies of th…
1. True 2. False 3. False 4. True 5. False
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43. write balanced complete ionic and net ionic equations for each reac…
Complete ionic equation: $H^+(aq)+Cl^-(aq)+Li^+(aq)+OH^-(aq) ightarrow H_2O(l)+Li^+(aq)+Cl^-(aq)$ Net ionic equation: $H^+(aq)+OH^-(aq) ightarrow H_2O(l)$
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which one of the following is the correct dissociation equation for alb…
C. $AlBr_{3}(s) ightarrow Al^{3 +}(aq)+3Br^{-}(aq)$
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which of the following are considered advantages of chrome os? select a…
B. Boots quickly, D. Easy remote management
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complete the balanced dissociation equation for the compound below in a…
$Mg(OH)_2(s) ightleftharpoons Mg^{2 + }(aq)+2OH^-(aq)$
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multiple choice question in smooth muscle fibers, the thick filaments d…
dense bodies
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write the balanced dissociation equation for solid aluminum sulfide in …
$Al_2S_3(s) ightarrow2Al^{3 + }(aq)+3S^{2 - }(aq)$
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write the balanced dissociation equation for solid sodium acetate in aq…
$NaC_2H_3O_2(s) ightarrow Na^+(aq)+C_2H_3O_2^-(aq)$
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complete the balanced dissociation equation for the compound below in a…
$Hg_2SO_4(s) ightarrow Hg_2^{2 + }(aq)+SO_4^{2 - }(aq)$
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39. complete and balance each equation. if no reaction occurs, write no…
NO REACTION
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the ions formed when ch₃oh dissociates in water are answer: a ch₃⁺ and …
E. No ions form, as $CH_3OH$ does not dissociate.
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the following picture of an aqueous solution best represents answer: a …
B. a weak electrolyte