化学
化学反応、化学量論、分子構造、元素の性質。
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tag all the carbon atoms with pi bonds in this molecule. if there are n…
The two carbon atoms in the $C = C$ double bond should be tagged.
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answer the questions in the table below about the shape of the methane …
How many electron groups are around the central carbon atom? 4 What phrase best describes the arrangement of these electron groups around the central carbon atom? tetrahedral
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missed this? read section 4.4 (page); watch kcv 4.4, iwe 4.6. consider …
2
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answer the questions in the table below about the shape of the amide (n…
4 tetrahedral
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in the following molecule, determine whether c6 is $sp^{2}$ - or $sp^{3…
$sp^{2}$
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part 3 of 3 sigma bond(s): pi bond(s):
Sigma bond(s): 10 Pi bond(s): 3
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question 22 of 34 (1 point) | question attempt: 1 of 1 how many sigma b…
Part 1: Sigma bond(s): 4 Pi bond(s): 0 Part 2: Sigma bond(s): 5 Pi bond(s): 1
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specify which hybrid orbitals are used by carbon in co.
sp
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consider the molecular shape of sulfur trioxide (so₃). select the singl…
Part 1 of 2: Trigonal planar Part 2 of 2: $sp^{2}$
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serotonin is a neurotransmitter involved in mood and emotional regulati…
$C_{10}H_{12}N_{2}O$
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using the vsepr model, predict the molecular geometry of asbr₅. select …
trigonal bipyramidal
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use the vsepr method to predict the molecular geometry of n₂o (arrangem…
linear
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using the vsepr model, predict the molecular geometry of alf₃ (bent, li…
trigonal planar
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is the molecule polar or nonpolar? select the single best answer. polar…
Nonpolar
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part 3 of 3 identify the most important resonance structure. select the…
:N≡N—S:
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for each resonance form, determine the formal charge for each atom. str…
Structure 1: Formal charge for N (left) = 0 Formal charge for N (center) = 1 Formal charge for S = 0 Structure 2: Formal charge for N (left) = 0 Formal charge for N (center) = 1 F…
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identify the possible resonance structure(s) for n2s. check all that ap…
$\ddot{N}=S=\ddot{N}:$, $:N\equiv S-\ddot{N}:$, $\ddot{N}-N=\ddot{S}:$, $\ddot{N}-S\equiv N:$, $:N\equiv N-\ddot{S}:$
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on the basis of their positions in the periodic table, write the chemic…
Part 1: Cs Part 2: Sr Part 3: Bi Part 4: Br
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explain which of these ions is larger, and why: cu⁺ or cu²⁺. part: 0 / …
Part 1 of 2: Cu⁺ Part 2 of 2: Because Cu⁺ has one more electron than Cu²⁺.
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explain which of these ions is larger, and why: cu⁺ or cu²⁺. part: 0 / …
$\text{Cu}^{+}$
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list the following ions in order of increasing ionic radius: sr^{2 +}, …
$Sr^{2+}<Rb^{+}<Br^{-}<Se^{2 - }<As^{3 - }$
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highlight the smallest atom in group 16 of the periodic table below.
Oxygen (O)
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for the electronic configuration given, choose the electronic configura…
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{6}5s^{2}4d^{10}5p^{6}6s^{1}$
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which group of the periodic table is the following element found in? ar…
Group 4
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read the lines from the tide rises, the tide falls. along the sea - san…
It strengthens the connection between the two lines.
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highlight the nonmetals in the periodic table below.
H, He, B, C, N, O, F, Ne, Si, P, S, Cl, Ar, Ge, As, Se, Br, Kr, Sb, Te, I, Xe, Po, At, Rn
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question 7 the following molecule has how many degrees of unsaturation?…
C. 4
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4. how many particles are in 1.20 mol of sodium sulfide? 5. how many pa…
4. $7.23\times 10^{23}$ particles 5. $7.53\times 10^{23}$ particles 6. $1.07\times 10^{22}$ atoms 7. $1.26\times 10^{23}$ formula - units 8. $3.35\times 10^{25}$ molecules 9. $1.5…
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | |--|--|--|--|--| | electron | $e^-$ | - 1 | 0 | B | | neutron | $n^0$ | 0 | 1.0 | A |…
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read each description in the first column of the table below. if any ch…
| description | Does any element with \(Z\leq92\) match the description? | If you checked yes, give the symbol of an element with \(Z\leq92\) that matches. | | --- | --- | --- | |…
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for each list, place elements in order of least to greatest atomic mass…
1) N, As, Bi 2) Ne, Ar, Rn 3) Ca, Fe, Pb
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which statement best describes the rhyme scheme of \a thought on the in…
There are two stanzas with the rhyme scheme ABAB throughout.
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a chemical engineer must report the average volume of a certain polluta…
\(13.1\) L
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a chemistry student must write down in his lab notebook the concentrati…
$2.78\ g\cdot mL^{-1}$
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reviewing content choose the letter that best answers the question or c…
1. a. water 2. d. a mixture 3. b. suspension 4. b. flammability 5. c. wood 6. c. malleable 7. a. solid 8. d. baking a cake 9. a. reactivity 10. b. a chemical change 11. A pure sub…
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balance the chemical equation below using the smallest possible whole -…
$1N_2(g)+3H_2(g) ightarrow2NH_3(g)$
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which statement best describes the rhyme scheme in \a psalm of life\? t…
The poem adheres to strict ABAB rhyme scheme, with the exception of the final stanza.
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which of these is an example of a chemical change? feeling ice melt on …
leaving cheese out to get moldy
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which of these is an example of a chemical change? burning gasoline den…
burning gasoline
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which option is an example of a physical change? gasoline burning silve…
D. metal denting
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what does the release or absorption of energy indicate? chemical change…
chemical change
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which property is a chemical property of a substance? ○ melting point ○…
C. reactivity
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what is the rhyme scheme of \a psalm of life\? abba aabb abbc abab
D. ABAB
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identifying parts of an atom identify the parts of the atom that are la…
Label A: Nucleus Label B: Electron
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which statement belongs to daltons atomic theory? atoms have a massive,…
Atoms cannot be created or destroyed.
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the atomic models after daltons time included ideas about the atomic st…
Schrödinger’s model
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according to the law of conservation of matter, matter is neither chang…
A. changed, destroyed
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what new characteristic did john dalton add to the model of the atom? a…
An atom can join with other kinds of atoms.
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the nucleus of an atom has a(n) electric charge. a positive b neutral c…
A. positive
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question 8 (1 point) which of these shows a structural model of a compl…
B.
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5 which element did mendeleev predict before it was discovered? a neptu…
B. Gallium
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1 who was the scientist credited with the development of the periodic t…
C. Dmitri Mendeleev
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a group of students are wandering around a room. when their teacher cla…
an amorphous solid because the particles do not have a regular structure
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the repeating subunits that are responsible for the shape of a crystal …
unit cells.
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what happens when the kinetic energy of molecules increases so much tha…
Matter changes to a plasma state.
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what happens when a solid is dissolved into a liquid? solid particles f…
Solid particles become evenly dispersed among liquid particles.
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carla makes a small cardboard boat and floats it in a tub of water. whe…
The soap reduced the surface tension behind the boat, causing both water molecules and the boat to be pulled forward.
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the particles in water have less mobility than the particles in oxygen.…
Water particles have strong intermolecular forces.
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glycerol boils at a higher temperature than water. what does this indic…
They are stronger than those in water.
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liquids and solids are referred to as condensed phases because the attr…
leave little space between the molecules.
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which process most likely takes place when the kinetic energy of molecu…
A. boiling
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melting can be best described as a process in which molecules lose kine…
gain enough kinetic energy to get past each other.
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which term best describes the substances that cause oil and water molec…
A. surfactants
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george is studying compounds that are found in living things. he makes …
Many compounds can be made by different combinations of the same elements
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the model shows a hydrolysis reaction. complete the sentence. during a …
During a hydrolysis reaction, disaccharides are broken down into monosaccharides to release energy.
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select the polysaccharide.
The middle structure (the one with multiple monosaccharide units linked together)
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compare the chemical structure of maltose to lactose and sucrose. compl…
Maltose is a disaccharide made of two glucose. Compared to lactose and sucrose, maltose has the same number of carbon, hydrogen, and oxygen atoms.
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galactose. compare glucose, fructose, and galactose. glucose fructose g…
| | glucose | fructose | galactose | |--|--|--|--| | has 12 hydrogen and 6 oxygen atoms | √ | √ | √ | | is a monosaccharide | √ | √ | √ | | has a 6 - atom ring | √ | × | √ |
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carbohydrates are also known as saccharides. the word saccharide is a t…
$C_6H_{12}O_6$
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10 multiple choice 1 point high - speed videos of lightning show that s…
10. Electric fields in the atmosphere guide charges in stages, causing electrons to move along regions where the field is strongest. 11. Oxygen has 6 valence electrons and gains 2…
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6 multiple choice 1 point coulombs law describes the force between char…
It quadruples ### 7.
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question 4 consider a random nitrile rubber poly(acrylonitrile - butadi…
53340
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4 multiple choice 1 point which of the following best explains why nitr…
4. The energy from lightning excites atoms enough to transfer or remove electrons. 5. Oxygen (O)
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1 multiple choice 1 point which best describes lightning from a chemist…
1. A large movement of electrons creating an electric discharge 2. Heat and water vapor increase particle movement, creating more charge separation 3. How do atoms and charges in …
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this is the continuation of the previous question. calculate the number…
1000
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question 4 consider a random nitrile rubber poly(acrylonitrile - butadi…
53.34 g/mol
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21) how much energy is released during the formation of 98.7 g of fe ac…
A. 753 kJ
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reactants are the substances going into a chemical reaction. products a…
B. An element
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what does cleaning water before we use it and after we use it require? …
chemicals and energy
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which of the following schematics is consistent with a polymer architec…
(d)
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a student conducts an experiment to determine the effect of adding salt…
amount of salt added
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match each two - dimensional structure to its correct three - dimension…
- Linear: $Y - X - Y$, $Y=X = Y$ - Trigonal planar: $Y - X - Y$ (with a lone - pair on $X$) - Bent: $Y - \ddot{X}-Y$, $Y - \ddot{X}=Y$ - Tetrahedral: $Y - X - Y$ (with 4 bonding p…
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which of the following schematics is consistent with a polymer architec…
A. The structure in option (a) shows a main chain with two distinct block - like regions (different colored circles in sequence) and side - chains attached to the main chain, whic…
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match each two - dimensional structure to its correct three - dimension…
1. For \(Y - X - Y\) with no lone - pairs on \(X\): Linear 2. For \(Y=X = Y\): Linear 3. For \(Y - \ddot{X}-Y\) with two lone - pairs on \(X\): Bent 4. For \(Y - \ddot{X}-Y\) with…
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after dinner, hector demonstrated to his parents a process that he lear…
C. How two pure substances can be combined to form a solution
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is this a run - on sentence? two hydrogen atoms and one oxygen atom com…
no
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6. what is the name of the subatomic particle that changes when we have…
6. Neutron 7. Mass number = number of protons+number of neutrons 8. Carbon - 14 or $^{14}C$ 9. Zirconium 10. 80 11. 40 12. 40
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c. the sum of the superscripts should equal the total number of electro…
1. $1s^22s^22p^63s^1$ 2. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^24d^{10}5p^66s^24f^{14}5d^{10}6p^2$ 3. $1s^22s^22p^63s^23p^64s^23d^{10}4p^65s^2$ 4. $1s^22s^22p^63s^23p^64s^23d^{10…
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which term means \stopping bleeding\? hemoglobin hemostasis thrombosis …
B. hemostasis
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what are chemical sedimentary rocks formed from? chemicals dissolved in…
chemicals dissolved in water
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2. refer to the 3 stable isotopes of argon above. as the mass number of…
2. C. remains the same 3. A. a positive charge 4. B. moving in circles 5. C. (the diagram with 2 electrons in the first shell, 8 in the second shell and 7 in the third shell)
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you have learned the formation processes of each type of rock in the ro…
Igneous: molten rock cools, intrusive, extrusive Sedimentary: compaction and cementation, clastic, organic, chemical Metamorphic: heat and pressure, foliated, nonfoliated
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how do metamorphic rocks form? heat and pressure will only chemically c…
Heat and pressure chemically changes a parent rock of any type in the rock - cycle (igneous, sedimentary, or metamorphic) to form a metamorphic rock.
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multiple - choice question in the nucleus of an atom are particles call…
Protons and neutrons
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a. include and label all the major subatomic particles of the atom. b. …
a. Protons (in nucleus, + charge), neutrons (in nucleus, 0 charge), electrons (outside nucleus, - charge) b. in the nucleus c. in the nucleus d. outside the nucleus
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multiple - choice question the building blocks of all things are atoms …
A. Atoms
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match each nutrient class with its description. proteins vitamins fats …
proteins - build(s) and maintain(s) tissue vitamins - facilitate(s) normal growth and function, organic compound fats - store(s) calories for future use carbohydrates - provide(s)…
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6. apply: turn off show all and show neutron:proton ratio. predict whet…
A. Unstable; High neutron - proton ratio for a light element. B. Stable; Neutron - proton ratio of 1. C. Unstable; Odd - odd nucleus. D. Unstable; Undergoes radioactive decay (alp…
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5. analyze: if necessary, continue to save points on the graph until th…
A. The slope of the band of stability becomes steeper as the number of protons increases. B. Approximately 1.5 C. Lead - 208 ($^{208}$Pb)
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4. investigate: next to the graph, click the - button once to zoom out.…
A. Tin - 120 ($^{120}_{50}Sn$), tellurium - 128 ($^{128}_{52}Te$), xenon - 132 ($^{132}_{54}Xe$) B. No C. Approximately 1.4 - 1.5