化學
化學反應、化學計量、分子結構與元素性質。
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which is a decomposition reaction? caco₃ → cao + co₂ mgo + h₂o → mg(oh)…
\(CaCO_{3}\to CaO + CO_{2}\)
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5 select the correct answer. when hydrochloric acid reacts with sodium …
A. 1.28 moles
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4 select the correct answer. what is the molar ratio of li to n₂ in the…
D. \(6:1\)
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3 select the correct answer how many moles of water are produced when 3…
C. 6.50 moles
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2 select the correct answer. carbon disulfide is formed by the reaction…
B. 1.6 moles
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1 select the correct answer. what is the ratio of no:n₂ in the given re…
B. \(6:5\)
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the owner of an organic pet food store would like to analyze the sales …
15%
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a bakery has developed a new artisan bread. the staff are giving away t…
Observe customer reactions while they taste the product, Measure sales of the new bread after customers have sampled it.
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part b balance the following equation , and then find the number of mol…
The balanced equation is \(C_3H_8 + 5O_2=3CO_2+4H_2O\) and the number of moles of \(O_2\) is \(1.625\) mol.
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activity in the activity, you will balance the given equations using th…
$1.6$ moles
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29. which of the following are mixtures? a. soda, fruit loops, water b.…
C. salt water, soda, juice
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6. elements in a__________have similar chemical properties. a period b …
B. group
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1. compare and contrast a mixture and a compound. how are they alike? h…
1. Mixture and compound are alike as both are made of two or more substances. They differ as compound has fixed composition (chemical reaction product) and mixture has variable co…
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a hormone is an organ that secretes chemical substances into the bloods…
F
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5) your hemoglobin contains 0.33% iron by mass. if the molar mass of he…
There are \(4\) iron atoms in each molecule of hemoglobin.
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what are acids and bases, and how do they react? watch each term in the…
1. C; 2. E; 3. B; 4. A; 5. D. 6. The apple likely contains an acid. Test with blue litmus paper; if it turns red, it's an acid. 7. Bases react with grease and organic matter (can …
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acids and bases vocabulary acid acid - base indicator antacid base blue…
1. red; acid 2. blue; base 3. acid - base indicator 4. pH scale; neutral 5. neutralization reaction; salt 6. antacid
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4) what is the molar mass of air, assuming it is 78% nitrogen, 21% oxyg…
\(29\space g/mol\)
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8. what happens to the valence electrons as you go right on a period in…
c. Their number increases # 9.
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how does therapy help in the treatment of depression? a. changes negati…
A. changes negative thinking patterns
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4. which element would have the lowest ionization energy? • a. barium (…
- 4. A. Barium (Ba) - 5. C. They do not need additional electrons - 6. D. Decreases from top to bottom, increases from left to right - 7. C. Metallic character increases as you mo…
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1. what is the general trend for atomic radius as you move from right t…
1. A. Atomic radius increases 2. B. Decreasing nuclear charge with the same number of electron shells 3. A. It increases
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2) water auto - ionizes according to the following equation: h₂o(l) → h…
\(1.8\times 10^{-7}\%\)
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carbohydrates are molecules made up of one or more simple sugars, and t…
- Contain three or more sugars: Complex carbohydrates - Are found in grains, breads, and rice: Complex carbohydrates - Are easy to digest: Simple carbohydrates - Quickly raise blo…
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61. you can purchase nitric acid in a concentrated form that is 70.3% h…
Measure out \(7.31\space mL\) of the concentrated \(HNO_3\) (using a graduated cylinder). Transfer it to a \(1.15\space L\) volumetric flask. Add water to the mark on the volumetr…
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use the text to compare and contrast microwave ovens and conventional o…
- Are found in most American homes: Microwave ovens (✔), Conventional ovens (✔) - Cook food by heating water molecules: Microwave ovens (✔), Conventional ovens (✖) - Can be used f…
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which best describes why acetic acid (ch₃cooh) is an organic compound, …
Acetic acid contains a significant amount of carbon, but sodium hydroxide contains no carbon.
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read the excerpt from ovids \pyramus and thisbe\. the blood leaped high…
The figurative language describes the violence of the scene.
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during world war 2, metallic sodium was used to manufacture certain typ…
Lithium (Li)
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ethanol, an organic compound, has the following structural formula. wha…
\(C_{2}H_{6}O\) (the fourth option)
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markus is reading a sonnet by william shakespeare. which will best help…
finding a single concept that links the lines together
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how is a poems rhyme scheme marked and identified? upper or lowercase l…
upper or lowercase letters, such as "ABAB"
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name period identifying molecular geometry directions: draw the lewis s…
- For \(H_2O\): Shape Name - Bent (V - shaped), Bond Angle - \(104.5^{\circ}\) - For \(PCl_3\): Shape Name - Trigonal pyramidal, Bond Angle - \(100^{\circ}\) - For \(BF_3\): Shape…
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match the correct electron configuration with the correct element * 6 p…
- \([\text{Kr}]5\text{s}^2\): Strontium - \([\text{He}]2\text{s}^22\text{p}^4\): Oxygen - \([\text{Ar}]4\text{s}^23\text{d}^8\): Nickel - \([\text{Ne}]3\text{s}^23\text{p}^2\): Si…
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is the compound soluble or insoluble in water? naoh
soluble (aq)
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is the compound soluble or insoluble in water? na₂cro₄ sodium chromate …
soluble (aq)
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based on the activity series, which of the reactions will occur? most r…
Only \(Li + Zn(ClO_3)_2\) reaction will occur.
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zn is less reactive than mg according to the activity series. zn + mg(n…
The reaction will not occur based on the activity series.
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we know zn is the free element. according to the activity series below,…
Magnesium is more reactive than zinc.
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lets consider the reaction below. in order for the reaction to proceed,…
zinc
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what metal is the least reactive metal according to the data? yes = rea…
\(Pb\)
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which is not a violation of electron rules? * 1 point
A. Option Text
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what is the least reactive metal according to the data? yes = reaction …
\(Hg\)
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zn + h₂s → zns + h₂ which reaction shows the correctly balanced equatio…
\(Zn + H_2S ightarrow ZnS + H_2\)
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use hunds rule to evaluate the following: * the orbital diagram for a g…
C.
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zinc reacts with dihydrogen sulfide in a single replacement reaction. z…
\(ZnS + H_2\)
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agno₃ + be → ag + be(no₃)₂ which reaction shows the correctly balanced …
\(2AgNO_3 + Be ightarrow Be(NO_3)_2+2Ag\) (the fourth option in the given list)
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given the following configuration, what element is indicated; ar 4s², 3…
Cobalt
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silver nitrate reacts with beryllium in a single replacement reaction. …
\(Be(NO_3)_2+Ag\) (the third option)
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ionic nomenclature ws name for each pair of ions: 1) write the missing …
1) \(K^{+},HCO_{3}^{-},KHCO_{3}\), Potassium Bicarbonate 2) \(Mg^{2 + },CrO_{4}^{2-},MgCrO_{4}\), Magnesium Chromate 3) \(Ba^{2+},O^{2 - },BaO\), Barium Oxide 4) \(Al^{3+},H_{2}PO…
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what is the correct electron configuration for tellurium? xe 5s², 5d¹⁰,…
\([Kr]5s^{2},4d^{10},5p^{4}\) (the third option)
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12. the following question has two parts. answer part a first, and then…
- Part A: c. He will not allow a well - mannered guest to be insulted in his home. - Part B: a. *To be a virtuous and well - governed youth. / I would not for the wealth of all th…
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copper(ii) hydroxide decomposes into copper(ii) oxide and water when he…
\(Cu(OH)_2 ightarrow CuO + H_2O\)
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the emission of different colors of light by elements is caused by: * 1…
Electrons falling from an excited state to a ground state
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sodium and sulfur react to form sodium sulfide, na2s. na + s → na2s wha…
\(2Na + S ightarrow Na_2S\)
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what product forms when sodium reacts with sulfur? hint: make sure the …
\(Na_{2}S\)
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how would you classify this reaction? c₃h₈ + 5o₂ → 3co₂ + 4h₂o redox do…
redox
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balance the chemical reaction below. hbr + ba(oh)₂ → babr₂ + h₂o what i…
2
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balance the entire chemical reaction using an atom inventory. remember …
\(2\)
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what is the correct equation in word form? mg + agno₃ → mgcl₂ + ag mang…
Magnesium plus silver nitrate yields magnesium chloride and silver.
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balance the entire chemical reaction using an atom inventory. remember …
\(2\)
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balance the entire chemical reaction using an atom inventory. remember …
\(2\)
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what does the passage say you need to understand to make wise financial…
1. The difference between needs and wants 2. Practicing patience and finding contentment 3. (Assuming based on general financial principles and the previous two answers, but since…
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get it? identify the three types of subatomic particles.
Protons, neutrons, and electrons.
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identify some of the elements and their symbols by filling in the table…
|Symbol|Name| |------|----| |Pt|platinum| |W|tungsten| |Rn|radon| |I|iodine| |B|boron| |Li|lithium| |Cu|copper| |Cs|cesium| |Ni|nickel| |Pb|lead| |Es|einsteinium| |He|helium|
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a writer is writing the content for the company website of a backpack m…
- "Call our prompt and friendly customer service department with questions and feedback." - Contact - "Our most popular backpack is made from soft, sturdy, washable organic cotton…
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which occurs during digestion? the mouth only allows for physical diges…
Physical digestion prepares the food for chemical digestion.
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which might indicate to a doctor that there is an issue with someones b…
sugar in the urine
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which is the role of the gall bladder? o to provide physical digestion …
To store the liquid produced by the liver.
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b. balanced formula equation: hno₂(aq) + koh(aq) →+ complete ionic equa…
b. - Balanced formula equation: \(HNO_{2}(aq)+KOH(aq) ightarrow KNO_{2}(aq)+H_{2}O(l)\) - Complete ionic equation: \(HNO_{2}(aq)+K^{+}(aq)+OH^{-}(aq) ightarrow K^{+}(aq)+NO_{2}^{-…
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an electrically neutral atom of your starter, has an atomic number of 1…
31
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a. balanced formula equation: hno₃(aq) + ga(oh)₃(s) → complete ionic eq…
- Balanced formula equation: \(3HNO_3(aq)+Ga(OH)_3(s)=Ga(NO_3)_3(aq)+3H_2O(l)\) - Complete ionic equation: \(3H^{+}(aq)+3NO_3^{-}(aq)+Ga(OH)_3(s)=Ga^{3 +}(aq)+3NO_3^{-}(aq)+3H_2O(…
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an individual was exposed to a contagious disease but did not become in…
B. physical barrier
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the inflammatory response involves chemical and physical barriers that …
F
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plastic recycling trey loker 1recycling is a very important activity fo…
- First Question: C. People need to recycle plastic to help protect our precious earth! - Second Question: A. Citizens need to see the value in recycling as an important duty for …
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now you try some on your own! 1. what would the molar mass of h₂o be? 2…
1. \(18\space g/mol\) 2. \(58.5\space g/mol\) 3. \(191.5\space g/mol\)
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9. this is the aufbau notation written below is for which of the follow…
C. Tin
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version b name period chemistry quiz: atomic notation, ions, & valence …
1. Atomic \#: \(35\), \(\#\) of protons: \(35\), \(\#\) of electrons: \(35\), \(\#\) of neutrons: \(45\) 2. Atomic \#: \(30\), Mass \#: \(65\), \(\#\) of protons: \(30\), \(\#\) o…
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balance the equations below: 1) ____ n₂ + ____ h₂ → ____ nh₃ 2) ____ kc…
1. \(1N_2 + 3H_2=2NH_3\) 2. \(2KClO_3=2KCl + 3O_2\) 3. \(2NaCl+F_2 = 2NaF+Cl_2\) 4. \(2H_2+O_2 = 2H_2O\) 5. \(Pb(OH)_2 + 2HCl=2H_2O+PbCl_2\) 6. \(2AlBr_3+3K_2SO_4 = 6KBr+Al_2(SO_4…
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which of the following best states the difference between an alcohol an…
In an alcohol, a carbon atom is single bonded to a hydroxide group (\(OH^{-}\)); in an ether, an oxygen atom is single bonded to two carbon atoms.
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which of the following is a characteristic of a typical carbon atom? ca…
Carbon can form single, double, and triple bonds.
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in what method of weed control are weeds physically destroyed or remove…
Mechanical
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methanol can be used to prevent certain liquids from freezing in cold w…
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | \(H\) | \(40\) | | \(C\) | \(10\) | | \(O\) | \(10\) | The number of methanol (\(CH_4O\)) molecules produc…
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acetaldehyde is a substance commonly used in chemical factories. it is …
| Chemical element | Number of atoms in the reaction | | ---- | ---- | | H | \(16\) | | C | \(8\) | | O | \(4\) | Number of acetaldehyde (\(C_2H_4O\)) molecules produced: \(4\)
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determine the partial pressure of each gas as shown in the figure below…
Partial pressure of Ar = \(0.42\ atm\) Partial pressure of Ne = \(0.83\ atm\) Partial pressure of He = \(1.25\ atm\)
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for the following reaction identify the oxidizing agent, the reducing a…
Oxidizing agent: \(O_{2}\) Reducing agent: \(CH_{4}\) Substance being oxidized: \(CH_{4}\) Substance being reduced: \(O_{2}\)
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what is the name of the polyatomic ion? clo$_{3}^{-1}$ hypochlorite chl…
Chlorate
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what is the most common ion charge for a group 2 element? +1 +2 -1 -2
+2
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which of the following ion/ions are soluble except ag+? c₂h₃o₂⁻ cl⁻, br…
\(C_{2}H_{3}O_{2}^{-}\)
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what is the name of the polyatomic ion? oh⁻¹ hydroxide oxohydride hydro…
hydroxide
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what is the most common ion charge for iodine, a group 7a element? +1 +…
-1
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choose which of the following are oxidation - reduction reactions(selec…
\( \text{Zn}(s)+2\text{HCl}(aq)\to\text{ZnCl}_2(aq)+\text{H}_2(g) \), \( 2\text{CuCl}(aq)\to\text{CuCl}_2(aq)+\text{Cu}(s) \), \( \text{OCH}_4(g)+2\text{O}_2(g)\to\text{CO}_2(g)+2…
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what is the most common ion charge for aluminum? +1 +3 -3 -1
+3
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which of the following ion/ions are always soluble -- no exceptions? oh…
Group 1, \(NH_4^+\), \(NO_3^-\), & \(ClO_3^-\)
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magnesium is a metal metalloid non - metal none of these
metal
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is the compound soluble or insoluble in water? cas insoluble (s) solubl…
insoluble (s)
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choose which of the following are oxidation - reduction reactions. (sel…
\(OCH_4(g)+2O_2(g)\to CO_2(g)+2H_2O(g)\), \(Zn(s)+2HCl(aq)\to ZnCl_2(aq)+H_2(g)\), \(O_2CuCl(aq)\to CuCl_2(aq)+Cu(s)\)
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is the compound soluble or insoluble in water? k₂s
soluble (aq)
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is the compound soluble or insoluble in water? rboh
soluble (aq)
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is the compound soluble or insoluble in water? baco₃ barium carbonate i…
insoluble (s)