化学
化学反応、化学量論、分子構造、元素の性質。
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read this poem. feet pound pavement as miles pass, steady as tides, the…
The poem has an abcb rhyme scheme, Each stanza is a quatrain, The poem contains two stanzas.
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provide the correct iupac name for n₂o₄.
Dinitrogen tetroxide
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write the chemical formula for cobalt(ii) oxide
\(CoO\)
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in a given molecule containing a c - br bond, which atom has a partial …
B. \(C\)
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provide the correct iupac name for k₂so₄.
Potassium sulfate
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which of the following is an example of an ionic bond? answer: a f-f b …
C. Na - O
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write the chemical formula for lead(ll) nitrate
\(Pb(NO_{3})_{2}\)
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provide the correct iupac name for $li_{3}po_{4}$. (i) (ii) (iii) (iv) …
Lithium phosphate
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write the chemical formula for chromium(iii) sulfide
\(Cr_2S_3\)
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which of the following bonds is a polar covalent bond? answer: a li-cl …
C. \(H - Cl\)
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read the poem. instruments poised, chins high not a blink, nor a sigh a…
A. aabb
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bromomethane, $ch_{3}br$, is a very useful fumigant against a wide rang…
The Lewis structure has \(C\) in the center. \(C\) is single - bonded to three \(H\) atoms and one \(Br\) atom. \(Br\) has three lone pairs of electrons.
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write the chemical formula for dichlorine heptoxide
\(Cl_2O_7\)
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which of the following is an example of a covalent bond?answer:a k - cl…
C. \(H - Cl\)
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provide the correct iupac name for al(no₂)₃.
Aluminum nitrite
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provide the correct iupac name for sr(no₃)₂.
strontium nitrate
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provide the correct iupac name for if₅.
iodine pentafluoride
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the reason an ionic bond forms can best be described as answer: a the e…
A. the energy change for electron transfer results in a large gain in stability when the ionic bond forms.
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provide the correct iupac name for pbr₃.
Phosphorus tribromide
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which atom in the br-f molecule has a partial positive charge (δ+)?
A. Br
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a more electronegative atom answer: a will have more attraction to the …
A. will have more attraction to the electrons in a chemical bond.
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write the chemical formula for selenium hexafluoride
\(SeF_6\)
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in a polar covalent bond. answer: a both atoms in the bond have the sam…
B. one atom in the bond must have higher electronegativity than the other atom.
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provide the correct iupac name for fe(oh)₃.
Iron(III) hydroxide
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predict the chemical formula for the ionic compound formed by cu²⁺ and …
\(Cu_3P_2\)
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predict the chemical formula for the ionic compound formed by ca²⁺ and …
\(Ca(ClO_{3})_{2}\)
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ch of the following bonds is a nonpolar covalent bond?answer:ah-fbn-fcf…
D. \(F - F\)
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provide the correct iupac name for scl₂. (i) (ii) (iii) (iv) penta- tri…
Sulfur dichloride
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the molecule hit is: answer: a homonuclear b heteronuclear c monatomic …
B. heteronuclear
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which of the following statements best describes electronegativity in a…
B. electronegativity is the attraction an element's nucleus has for the electrons in a chemical bond.
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write the chemical formula for calcium chloride
\(CaCl_{2}\)
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predict the chemical formula for the ionic compound formed by nh₄⁺ and …
\((\text{NH}_4)_3\text{PO}_4\)
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which has the correct name - formula combination? answer: a barium sulf…
D. potassium phosphate - \(K_{3}PO_{4}\)
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write the chemical formula for carbon tetrafluoride cc₄ incorrect, 3 at…
\(CF_4\)
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write the chemical formula for carbon tetrafluoride
\( CF_4 \)
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in a given molecule containing a c - f bond, which atom has a partial n…
A. F
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which of the following is not an example of a covalent bond? answer: a …
B. \(Mg - N\)
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you need to produce a buffer solution that has a ph of 5.270. you alrea…
\(32.9\ mmol\)
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in organisms, though, redox reactions involve changes in electron posit…
- For \(C - C\) bonds: The diagram with electrons equally shared between the two \(C\) atoms (e.g., if there is a diagram like \(C-\div - C\) where the dots are symmetrically plac…
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a graph of free energy for a reaction with a catalyst and a reaction wi…
From top to bottom (for the three un - labeled dotted lines): - free energy of the transition state without a catalyst - free energy of the transition state with a catalyst - free…
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which statements correctly describe a spontaneous reaction? select all …
Activation energy is required for the reaction to go to completion. The products always have lower free energy than the reactants.
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drag and drop each free energy graph to classify it as an exergonic or …
Exergonic reaction: First and second graph (left - most and middle among the three below). Endergonic reaction: Third graph (right - most among the three below).
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26.00 points possible | due sunday 10/26/25 at 11:59 pm 0/1 point earne…
- **Nonspontaneous reaction**: Free energy higher in products than in reactants, Occurs only if energy is added to the system - **Spontaneous reaction**: Free energy lower in prod…
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how could you change this molecule to make it soluble in the hydrophobi…
- Replace the O in box 1 with two \(CH_3\) groups - Replace the H in box 2 with a \(CH_3\) group - Replace the O in box 1 with Hs
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which group of fish will most likely be affected by the toxic chemicals…
First question: Fish at location A. Second question: Same at A and B. Third question: Same at A and B.
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a new factory has been constructed near a large, still lake that is hom…
First question: Fish at location A. Second question: Same at A and B.
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stress causes levels of brain chemicals to rise. the effect can be unhe…
Cause/Effect
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which of the highlighted chemical bonds in the molecules below is longe…
Length of highlighted bond: \( H - Ge \) (longest), \( H - Si \) (in - between), \( H - C \) (shortest). Energy of highlighted bond: \( H - C \) (highest), \( H - Si \) (in - betw…
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four 0.4 mol samples of krypton gas are described in the table below. r…
D: 1, B: 2, C: 3, A: 4
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what is kinetic energy? a. the energy an object has due to its motion b…
A. the energy an object has due to its motion
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stress causes levels of brain chemicals to rise. the effect can be unhe…
Cause/Effect
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why would ch not form as a result of carbons interactions with other el…
Carbon normally has four covalent bonds.
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which compounds would not form as a result of carbons interactions with…
\(\text{CH}\)
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c₂h₂ + 5o₂ → 4co₂ + 2h₂o model atoms mass: 26g → does this follow the l…
| Element | # in Reactants | # in Products | |---|---|---| | \(C\) | \(4\) (from \(2C_2H_2\)) | \(4\) (from \(4CO_2\)) | | \(H\) | \(4\) (from \(2C_2H_2\)) | \(4\) (from \(2H_2O\)…
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describe the following words 24. malleable- 25. ductile- 26. luster- 27…
- 24. Malleable: A material's ability to be hammered or rolled into thin sheets. - 25. Ductile: A material's ability to be drawn into thin wires. - 26. Luster: The property of a m…
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23. what are the characteristics of metalloids?
Metalloids have intermediate properties between metals and non - metals. They have some conductivity (less than metals), are brittle (like non - metals), and often show amphoteric…
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question 7 which passage from the article best supports the idea that b…
C. There are biodegradable containers without PFAS. And many grocery stores have since switched to safer packaging. Some people have called for composting places in the U.S. to ba…
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chemicals in a solution can move down a concentration gradient. this me…
higher; lower (corresponding to the option "higher, lower")
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4. what is an energy level? the region outside the nucleus where a prot…
the region outside the nucleus where an electron is likely to be moving
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3. which model of the atom described the atom like a solar system in wh…
C. Bohr
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1. which model of the atom described it as being a ball of positive cha…
Thomson
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snuggling in bed, mama reads me a spider-man book. im eight. peter park…
d. The narrator hopes for their mother to return strong and transformed, just like Spider - Man
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practice: electron configurations part 1: write out the electron config…
1. \(1s^{2}2s^{2}\) 2. \(1s^{2}2s^{2}2p^{5}\) 3. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}\) 4. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}3d^{10}\) 5. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^…
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baking basics quiz baking soda reacts chemically with acidic liquids to…
True
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ms. roberts asked tim to put the label \compound\ on the correct jar in…
D. water
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a student has a sample of an insoluble solid and a liquid. the task is …
B. Is the solid large enough to be caught by the pores of a filter?
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a mixture is what you get when you combine two substances in such a way…
D. a mixture of sugar and water
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homogeneous mixtures can exist a only in the gas phase. b only in the s…
C. as liquid, solid, or gas.
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air can be considered a mixture. which statement helps describe air? a …
D. The exact mixture of components varies from point to point.
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in science, jill is learning about solids such as brass, bronze, and st…
C. homogeneous mixtures
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which of the following is the best description that matches the runoff …
Erosion from water
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which of the following is the best explanation for what caused the crac…
Mechanical weathering due to frost wedging
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to make salt water a heterogeneous mixture, you would have to a add san…
A. add sand.
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orange juice is a heterogeneous mixture. because it contains particles …
A. soil, C. concrete, E. cereal with marshmallows
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which of these four liquids is a mixture, made of parts, some of which …
C. orange juice with pulp
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which procedure correctly describes materials combining into a homogene…
D. 5 g of salt is added to 100 mL of water
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when potassium chlorate, kclo₃, is heated, it decomposes into potassium…
\(6.1\space g\)
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select the correct answer. what happens when an electron absorbs energy…
A. The electron moves from a lower energy orbital to a higher energy orbital.
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complete the rhyme scheme. a a a b b how i adore you, you happy things,…
A, B, A, B, B
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what is the number of protons in this carbon atom? a. 12 b. 6 c. 18 d. …
B. 6
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complete the rhyme scheme. a a b b c the garden is very quiet tonight, …
A, A, B, B, C
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select the correct answer. which statement correctly describes protons?…
D. They have a positive charge and are present in the nucleus of an atom along with the neutrons.
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select the correct answer. in the modern quantum - based atomic theory,…
A. orbital
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select the correct answer. which subatomic particle has negligible mass…
C. electron
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complete the rhyme scheme. two roads diverged in a yellow wood, and sor…
A, B, A, A, B
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complete the rhyme scheme. a a a b b i visited the place where we last …
A, A, B, B, B
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complete the rhyme scheme. how beautiful is the rain! after the dust an…
A, B, B, C, A
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complete the rhyme scheme. a a a b b i try to catch at many a tune like…
A, A, A, B, B
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complete the rhyme scheme. the great bare tree looked down and smiled. …
A, A, B, B, C
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complete the rhyme scheme. a b b c c sometimes the mist overhangs my pa…
A, B, B, C, C
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a. write a rule for an atom neutral (one with o charge)? b. write a rul…
a. In a neutral atom, the number of protons is equal to the number of electrons. b. In a \(A^{+}\) ion (positive ion), the number of protons is greater than the number of electron…
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complete the rhyme scheme. a a b b c the garden is very quiet tonight, …
First line: \(A\) Second line: \(B\) Third line: \(A\) Fourth line: \(B\) Fifth line: \(C\)
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complete the rhyme scheme. a b b c c \who planted this old apple - tree…
A, B, B, C, C
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complete the rhyme scheme. a b b c im going out to clean the pasture sp…
A B B C
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complete the rhyme scheme. a a a b b how i adore you, you happy things,…
Line 1: A, Line 2: A, Line 3: A, Line 4: B, Line 5: B
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complete the rhyme scheme. a a a b b i visited the place where we last …
A A A B B
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complete the rhyme scheme. a a b c i think it no disgrace to occupy my …
A, A, B, B
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complete the rhyme scheme. when you and i were young, we knew to shout …
Line1: A (When you and I were young, we knew), Line2: B (To shout and laugh, to work and play), Line3: B (And night was partner to the day), Line4: A (In all our joys. So swift ti…
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determine if the following salt is neutral, acidic or basic. if acidic …
Acidic. $$\mathrm{NH_4^+(aq) + H_2O(l) ightleftharpoons NH_3(aq) + H_3O^+(aq)}$$
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write the formula of the conjugate acid of the brønsted-lowry base, (ch…
\((CH_3)_2NH_2^+\)