化學
化學反應、化學計量、分子結構與元素性質。
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write the balanced complete ionic equation for the reaction when fe(c2h…
$$\ce{2Fe^{3+}(aq)+6C2H3O2^{-}(aq)+3Ca^{2+}(aq)+6OH^{-}(aq)->2Fe(OH)3(s)+3Ca^{2+}(aq)+6C2H3O2^{-}(aq)}$$
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2naoh + h₂so₄ → na₂so₄ + 2h₂o 13.2 g naoh and 13.2 g h₂so₄ react. the l…
\(H_2SO_4\)
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in the following equations, determine which reactant is the limiting re…
A. \(HNO_3\)
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current attempt in progress in a blast furnace, iron(iii) oxide reacts …
\(93.7\space kg\)
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question 8 of 25 policies current attempt in progress given the unbalan…
(a) \(36\space mol\) (b) \(7.5\space mol\)
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owen is sending a fancy organic fruit basket to his grandmother for her…
\(2.17x + 2.66y<26\)
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oxygen masks for producing o₂ in emergency situations contain potassium…
\(0.193\) ---
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for mass - mass calculation, why is it necessary to convert the grams o…
Equations are written in terms of \(moles\), not \(grams\).
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current attempt in progress for the following equation which of the sta…
2 molecules of \(NH_3\) are produced.
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which of the following equations is correctly represented by the word d…
\(2Na(s)+2H_2O(l)\to2NaOH(aq)+H_2(g)\) (the fourth option)
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current attempt in progress the balanced equation for the complete comb…
\(9H_2O\)
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the products of the following reaction in the balanced equation should …
\(I_2 + 2KBr\) (corresponding to the option \(I_2+2KBr\))
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which of the following would be classified as an endothermic reaction? …
Ice melting.
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current attempt in progress what are three observations that would indi…
1. Color 2. Precipitate 3. Gas
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current attempt in progress four major types of chemical reaction were …
1. Decomposition reaction 2. Double - displacement reaction 3. Combination (synthesis) reaction 4. Single - displacement reaction
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what information is represented in the charts? propane c₃h₈(g) 1 molecu…
- The number of moles of each substance. - Track of which elements are balanced in a chemical equation. - The number and types of atoms on the each side of a chemical equation.
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current attempt in progress what is the purpose of balancing equations?…
Conservation of Mass
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symbols written after a substance are used to indicate the physical sta…
(s) - solid (l) - liquid (g) - gas (aq) - aqueous (solution)
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current attempt in progress what is represented by the numbers (coeffic…
moles
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the box below represents the reactant atoms in blue (b) and molecules i…
\(2B + 3G_2 ightarrow2BG_3\)
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homework: electron configuration complete the following homework assign…
$1.10$ g/mL
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14 multiple choice 1 point in the electron configuration 1s², what does…
The number of electrons in the subshell.
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using the periodic table, what is the predicted last orbital notation f…
C. \(5d^{1}\) ### Question 18
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2 multiple choice 1 point using the periodic table, what is the predict…
C. \(6d^{1}\) ### Problem 3
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read the passage. the stinky durian fruit the durian is an asian fruit …
Scientists found that a combination of different chemicals is responsible for the durian’s powerful odor.
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a newborn has more protein in their csf the adults but it decreases wit…
A. Coma Panel
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missed this? read section 4.2. you can click on the review link to acce…
\(SrI_2\)
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here are sketches of four electron orbitals: are any of them s orbitals…
- Are any of them s orbitals? : no - List the s orbitals, if any. : (leave blank) - Are any of them p orbitals? : yes - List the p orbitals, if any. : A
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complete the table below by filling in the principal quantum number ( n…
| subshell | principal quantum number \( n \) | angular momentum quantum number \( l \) | | ---- | ---- | ---- | | \( 6d \) | \( 6 \) | \( 2 \) | | \( 6p \) | \( 6 \) | \( 1 \) | …
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complete the table below by filling in the principal quantum number ( n…
| subshell | principal quantum number \(n\) | angular momentum quantum number \(l\) | |---|---|---| | \(4f\) | \(4\) | \(3\) | | \(5d\) | \(5\) | \(2\) | | \(1s\) | \(1\) | \(0\) …
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how can jared most effectively help minimize local environmental health…
by doing research and getting informed about local environmental problems
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the local news reports that chemical runoff from a nearby pesticide pla…
People may feel nauseous or experience dizziness following exposure to the water.
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question 5 (multiple choice worth 2 points) (02 02r mc) what characteri…
It decays in a set pattern.
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the photoelectron spectra above show the energy required to remove a 1s…
D. Nitrogen atoms have a smaller nuclear charge than oxygen atoms.
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multiple - choice question magnesium (mg) is a... non - metal metal rew…
Metal
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multiple - choice question which of the following are metalloids? (sele…
B. B, C. Si, D. Ge, E. As
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multiple-choice question what are metalloids? elements with properties …
Elements with properties of both metals and nonmetals
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multiple - choice question metals are on the right side of the periodic…
B. False
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multiple - choice question which terms describe noble gases? (select al…
Colorless, Unreactive, Gases only
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multiple - choice question halogens have which properties? (select all …
A. salt former, B. colorful, C. corrosive, E. very reactive
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what is the best description of sustainable manufacturing? sustainable …
Sustainable businesses avoid wasting or damaging natural resources.
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question # 10 multiple choice how does sustainable manufacturing differ…
It minimizes damaging or wasting natural resources.
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24 mark for review in which of the following species does sulfur have t…
D. \(SO_2Cl_2\)
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cs₂(1) + 3 o₂(g) → co₂(g) + 2 so₂(g) what volume of o₂(g) is required t…
A. 12 L
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multiple - choice question non metals have which properties? (select al…
Poor conductors of heat and electricity, Solids are brittle, Found in multiple states of matter (i.e. solid, liquid or gas)
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atoms, elements, and the periodic table | high school chemistry | khan …
Solid at room temp (except for Mercury), Ductile (can be drawn into a wire), Malleable (can pound into a sheet), Good conductors of heat and electricity.
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high school chemistry | khan academy chemistry | khan academy alkaline …
True
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read this us policy on clean water. the clean water act (cwa) establish…
to enforce standards that focus on chemical discharge into bodies of water
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it takes 155. kj/mol to break a fluorine - fluorine single bond. calcul…
\(772\text{ nm}\)
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it takes 463. kj/mol to break an oxygen-hydrogen single bond. calculate…
\(258\space nm\)
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it takes 338 kj/mol to break an carbon - chlorine single bond. calculat…
\(354\space nm\)
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complete the analogy. letter is to alphabet as element is to sodium per…
periodic table
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what is the smallest possible value of the principal quantum number ( n…
\(n = 3\)
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here are sketches of four electron orbitals: are any of them s orbitals…
- Are any of them s orbitals? no - List the s orbitals, if any. - Are any of them p orbitals? yes - List the p orbitals, if any. A, B, C
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the periodic table | atoms, elements, and the periodic table | high sch…
false
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the periodic table | atoms, elements, and the periodic table | high sch…
highly reactive, React with water, Not found in nature in their pure state
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2n₂h₄(g)+n₂o₄(g)→3n₂(g)+4h₂o(g) when 8.0g of n₂h₄(32gmol⁻¹) and 92g of …
A. \(9.0\ g\)
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write the balanced molecular chemical equation for the reaction in aque…
$$4NaOH(aq)+Sn(C_2H_3O_2)_4(aq) ightarrow 4NaC_2H_3O_2(aq)+Sn(OH)_4(s)$$
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14 mark for review which of the following represents the ground state e…
A. \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{4}\)
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what is the molarity of a solution in which 1.20 mol of solute is disso…
A. $0.400\space M$
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what is the molarity of the resulting solution when 300. ml of a 0.600 …
0.257 M
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what is the molarity of the resulting solution when 400. ml of a 0.400 …
\(0.200\space M\) (the third option)
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what is the molarity of the resulting solution when 300. ml of a 0.400 …
B. \(0.150\space M\)
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question 1 12 pts which liquid is miscible with water? carbon tetrachlo…
ethyl alcohol
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mark decided to investigate some household materials using the phenolph…
a. Household materials can be either acidic or basic. b. Mark's logic has problems. For example, he classified salt (\(NaCl\)) as an acid. Salt is a neutral salt, and phenolphthal…
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science which one of the following is not a state of matter? liquid gas…
Iron
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magnesium generates a very bright light. burning heating both burning a…
Burning
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heating chemicals is defined by the process of combustion. true false
False
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a metal is added to a liquid and bubbles form. what might be concluded?…
A. A chemical reaction occurred.
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a white precipitate formed from the mixing of two liquids is an indicat…
True
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science what scientific term means \breaking a compound down to its ele…
Electrolysis
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physical observations can be used to determine if a chemical change has…
True
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in a chemical reaction, the reactants are on the _____ of the written c…
C. left side
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science what two common substances create a toxic chlorine gas when com…
Bleach and vinegar
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a chemical reaction is a process where the atoms of substances interact…
True
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a chemical reaction is a process where the atoms of substances interact…
True
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identify an example of a chemical change. cutting a steak condensing va…
C. Cooking an egg
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chemistry 1 (lp - 5061 - ck - 01) / observation of chemical changes eva…
physical change
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science what does the periodic table organize? chemicals minerals antib…
Elements
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look at these details from a paragraph about the same topic: · scientis…
Goggles are worn to protect people's eyes during different activities.
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question 10 (multiple choice worth 3 points) (01.03r lc) which of the f…
Reactivity
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question 12 (multiple choice worth 3 points) (01 04r mc) a painting is …
It shows the underdrawings the painter made.
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question 16 (multiple choice worth 3 points) (d1 c3r mc) if a forensic …
B. Conduct a flame test that requires igniting a small amount of the powder.
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a forensics expert analyzes the ink of handwriting on a piece of paper.…
Red, blue, yellow
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carbon monoxide gas can be described as all of the following except col…
B. visible
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select all true statements (check all that apply) the equivalence point…
- The equivalence point means the point where the moles of acid equals the moles of base. - The end point has more base than acid. - The beginning of the reaction has more acid th…
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select all false statements. (check all that apply) the buret clamp is …
- B. The volume dispensed from a buret is calculated by subtracting the final volume from the initial volume. - D. The unknown solution goes into the buret.
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select all true statements as regards a buret (check all that apply) th…
- The graduations start from 0 at the top. - The curved line in the fluid is called the meniscus.
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use the ph interactive to complete the table. answer bank
| pH | \([H^{+}]\) (M) | \([OH^{-}]\) (M) | |---|---|---| | 9 | \(10^{-9}\) | \(10^{-5}\) | | 7 | \(10^{-7}\) | \(10^{-7}\) | | 5 | \(10^{-5}\) | \(10^{-9}\) |
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calculate the number of moles of solute in 25.29 ml of 0.1355 m k₂cr₂o₇…
\(0.003426\)
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question 5 of 9 step 1: how many moles of naoh are present in 14.5 ml o…
\(3.625\times 10^{-3}\)
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oliver needs to standardize a base solution by titration with an acid s…
1. Write a balanced equation for the reaction between the analyte and the titrant. 2. Calculate the number of moles of titrant using the volume of titrant required and the concent…
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question 3 of 9 determine the correct sequence of steps used in carryin…
1. Remove probe from storage solution, rinse probe. 2. Calibrate probe using two or three buffers, rinse probe. 3. Place probe in solution to be measured. 4. Observe readout on me…
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insert two dashes where needed. at sunfest organic farm a cutting-edge …
At Sunfest Organic Farm — a cutting - edge herb farm in Okeechobee, Florida — the herbs are washed with ultraviolet light in a vacuum - sealed room.
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because they penetrate the visible surface of a painting, ultraviolet a…
B. It can definitively undermine that attribution.
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which of the following statements best describes the pattern difference…
Covalent bonds typically occur between elements with similar electronegativities, while ionic bonds form between elements with significantly different electronegativities.
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10.2 quarter final unit 1 in 2 - 3 sentences, explain how the dissoluti…
Water's polarity causes **the dissociation of ions** in salts. This results in **the dissolution (hydration) of the salt as ions are surrounded by water molecules**.
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10.2 quarter final unit 1 what unique properties of water make it a sol…
All of the above.
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how do lewis dot diagrams help model bonding in chemical compounds? by …
By illustrating the valence electrons and how they are shared or transferred during chemical bonding
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how does hydrogen bonding contribute to the phenomenon of surface tensi…
Hydrogen bonds create a cohesive force among water molecules at the surface, making it more difficult for them to be pulled apart.