化学
化学反応、化学量論、分子構造、元素の性質。
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chemistry 1 (lp - 5061 - ck - 01) / molecular modeling and lewis struct…
C. linear
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alkali metals are a group located at the far left of the periodic table…
1. 1
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some compounds have more than one lewis structure. true false
True
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molecular modeling and lewis structures evaluation lewis structures eva…
B. False
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chemistry 1 (lp - 5061 - ck - 01) / molecular modeling and lewis struct…
B. carbon
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chemistry 1 (lp - 5061 - ck - 01) / molecular modeling and lewis struct…
describes the three - dimensional arrangement of the atoms in a molecule
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which of the following statements about periodic trends is/are true? i.…
# Explicación: ## Paso 1: Analizar la afirmación I Al ir de izquierda a derecha en un período, el número atómico aumenta, lo que hace que $Z_{eff}$ (carga nuclear efectiva) aument…
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y 1 (lp - 5061 - ck - 01) / molecular modeling and lewis structures eva…
True
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ry 1 (lp - 5061 - ck - 01) / molecular modeling and lewis structures ev…
C. Lewis structure
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1 (lp - 5061 - ck - 01) / molecular modeling and lewis structures evalu…
False
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which statement disagrees with the second law of thermodynamics? the di…
The disorder of a system and its surroundings decreases overall with time.
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valence electrons that are not shared between two atoms are called ____…
D. lone pairs
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which of the following statements about the periodic trend of atomic ra…
1. I and III only
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lp-5061-ck-01) / molecular modeling and lewis structures evaluation str…
False
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different structural modifications of an element are called ______. oct…
C. allotropes
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a chemical engineer is studying the following reaction: n₂(g)+3h₂(g)→2n…
$NH_3$: increase $H_2$: decrease $N_2$: decrease pressure: decrease
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ions in an ion, the sum of the oxidation states is equal to the overall…
Part C: +5 Part D: +3
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which of the following applies to the oxidative catabolism of aromatic …
B. It requires breakage of the aromatic ring(s). D. It eventually feeds into the TCA cycle. E. Two of the above are correct.
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neutral compounds in a neutral compound, the sum of the oxidation state…
Part A: +6 Part B: +5
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which substance is the oxidizing agent in this reaction? fe₂o₃ + 3co→2f…
$Fe_2O_3$ $C_2H_5OH$
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which element is oxidized in this reaction? fe₂o₃ + 3co→2fe + 3co₂ ente…
Part A: C Part C: Cr
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carbon can have many different oxidation states in its compounds. what …
A. -4; +4 D. +7
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part a which reactant types give rise to gas - evolution reactions? dra…
Reactants that give rise to gas - evolution reactions: sulfides, ammonium, nitrates, bisulfites, acetates, bicarbonates, bisulfates Reactants that do not give rise to gas - evolut…
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you are given a solution of hcooh (formic acid) with an approximate con…
### Part A D. 36.2 mL ### Part B D. 0.1958 M
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the titration of 11.00 ml of hcl solution of unknown concentration requ…
$0.166$
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give examples. check all that apply. □ hcl(aq) + koh(aq) → kcl(aq) + h₂…
- Acid - base reaction examples: $\mathrm{HCl(aq)}+\mathrm{KOH(aq)} ightarrow\mathrm{KCl(aq)}+\mathrm{H_2O(l)}$, $\mathrm{H_2SO_4(aq)}+\mathrm{Zn(OH)_2(s)} ightarrow\mathrm{ZnSO_4…
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part b give examples. check all that apply. hcl(aq) + koh(aq) → kcl(aq)…
$\mathrm{HCl}(aq)+\mathrm{KOH}(aq) ightarrow\mathrm{KCl}(aq)+\mathrm{H}_{2}\mathrm{O}(l)$ $\mathrm{H}_{2}\mathrm{SO}_{4}(aq)+\mathrm{Zn}(\mathrm{OH})_{2}(s) ightarrow\mathrm{ZnSO}…
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what is an acid - base reaction? match the items in the left column to …
When an acid and base are mixed, the $H^+$ from the acid combines with the $OH^-$ from the base to form $H_2O(l)$.
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if 17.5 ml of 0.800 m hcl solution are needed to neutralize 5.00 ml of …
2.8 M
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what is the net ionic equation of the reaction of mgso4 with pb(no3)2? …
$Pb^{2 +}(aq)+SO_4^{2 -}(aq) ightarrow PbSO_4(s)$
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in many chemical reactions of two or more compounds, ions are present i…
$Mg^{2 +}(aq)+2OH^{-}(aq) ightarrow Mg(OH)_2(s)$
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question 4 (1 point) enter the measurement of the water in the graduate…
44
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36. how many f orbitals can there be in an energy level? 37. how many e…
7 ### 43. What is the maximum number of electrons that can be present in an atom having three principal energy levels?
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what is the correct net ionic equation, including all coefficients, cha…
$Ba^{2 +}(aq)+2OH^{-}(aq)+2H^{+}(aq)+SO_{4}^{2 -}(aq) ightarrow BaSO_{4}(s)+2H_{2}O(l)$
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36. how many f orbitals can there be in an energy level? 37. how many e…
7
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part a when the following two solutions are mixed: k₂co₃(aq) + fe(no₃)₃…
Spectator ions: $K^+(aq), NO_3^-(aq)$ Ions that react: $Fe^{3+}(aq), CO_3^{2 -}(aq)$
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part a which of the ionic compounds shown below will be soluble in wate…
$Na_2SO_4$
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what mass of silver chloride can be produced from 1.81 l of a 0.182 m s…
Part A: Value: 47.2 Units: g Part B: Value: 0.109 Units: M
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question 2 why does the alcohol stay in a layer on top of the water? a …
B. alcohol is less dense
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2 multiple choice 4 points who introduced cavity embalming by the troca…
1. A. Samuel Rogers 2. C. Samuel Rogers 3. A. Airtight receptacles
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4 multiple choice 4 points which of the following was not a major influ…
4. A. Air tight receptacles 5. A. 1879 6. D. White
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16) find the matter terms in the wordsearch.
MATTER, SOLID, LIQUID, GAS, ATOM, MOLECULE, STATE, FORM
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choose the word that best completes the sentence. i need to find a ____…
friendly
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name the following ionic compounds. (contd) 4. agbr 5. cocl₂ 6. rb₂s 7.…
4. Silver bromide 5. Cobalt(II) chloride 6. Rubidium sulfide 7. Iron(II) sulfate 8. Sodium chlorate 9. Potassium acetate 10. Lead(II) sulfate 1. \(1\ Zn+1\ CuCl_2 ightarrow1\ ZnCl…
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2. lithium nitrate 3. cesium oxide 4. potassium phosphide 5. ammonium c…
1. Barium nitrate 2. Tin(IV) chloride 3. Ammonium hydroxide
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match the terminology with the correct symbol. a. δg b. eₐ c. h d. s 1.…
1. c. H 2. a. $\Delta G$ 3. b. $E_A$ 4. d. S
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write the correct formula for each molecular compound. 1. disulfur deca…
1. Molecular compound formulas: - disulfur decafluoride: $S_2F_{10}$ - dihydrogen monosulfide: $H_2S$ - nitrogen trihydride: $NH_3$ - phosphorus trichloride: $PCl_3$ 2. Molecular …
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physical vs. chemical change quick check which of the following happens…
Atoms of one or more substances rearrange into a new substance.
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how many valence electrons are in an atom of the element fluorine? (1 p…
C. seven
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practice: balancing equations #1 show all work on a separate sheet of p…
6. 1, 1, 1 7. 2, 1, 1 8. 2, 5, 2 9. 2, 3, 1, 6 10. 2, 1, 1, 1 11. 1, 1, 1, 1 12. 1, 1, 1 13. 4, 1, 2 14. 2, 3, 1, 6 15. 16, 3, 8 16. 3, 1, 1 17. 1, 1, 1 18. 10, 2, 5, 1 19. 2, 15,…
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10 which of the following describes a chemical reaction? a oxygen inter…
A. Oxygen interacts with iron to form rust
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8 in a chemical reaction, 4 grams of sodium must combine with how many …
B. 6 grams
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7 4 grams of hydrogen and 32 grams of oxygen will combine to form: a 36…
A. 36 grams of water
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6 when sodium and chlorine combine to form sodium chloride, sodium chlo…
C. Product
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5 sodium and chlorine combine to form sodium chloride, or table salt, s…
D. Reactants
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3 the law of conservation of mass says substances can neither be ______…
C. Created; destroyed
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2 what are the reactants in a chemical reaction? a the new substances t…
B. The substances that interact to form new substances
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which of the following is an example of a crystalline solid that shows …
B. salt
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8. a blue powder is mixed into water. when stirred, a blue solution is …
Physical change ### 9.
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a poem with fourteen lines and a fixed rhyme scheme is a
D. sonnet
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the atomic mass is which of the following added together? * electrons +…
1. Protons + Neutrons 2. Electron
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how many neutrons would sulfur have? its atomic number is 16. its atomi…
16
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how many neutrons would fluorine have? its atomic number is 9. its atom…
10
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how many protons would sulfur have? its atomic number is 16. its atomic…
16
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how many protons would iron have? its atomic number is 26. its atomic m…
26
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question 4 of 15 when a ball rolls down a hill, what energy conversion …
A. Potential energy to kinetic energy
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which of the following statements about matter is false? matter occupie…
Matter is smooth and continuous.
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the melting of ice is a physical change. true false
True
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4. which of the following is a chemical hazard? a. electrocution b. oxy…
B. Oxygen deficiency
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the model below shows a calcium atom. how many electrons are in the thi…
8
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famous friday - for the following famous scientist, you must research w…
Amedeo Avogadro was an Italian scientist. He is best - known for Avogadro's law, which states that equal volumes of gases at the same temperature and pressure contain the same num…
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this is how sodium appears in the periodic table. the arrow is pointing…
atomic mass
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when an atom that has no charge loses two electrons, it becomes a posit…
A. positive ion
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directions: answer the following questions. 1. which of the following i…
1. C. Workers should become complacent in their work 2. B. Electrical work 3. D. Wear dry gloves 4. None of the above (but if forced to choose based on the nature of options, the …
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the odor of gasoline is a chemical property. true false
False
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which characteristics of dickinsons style are evident in \the snow\? se…
A. four - line stanzas C. a varying rhythm D. the use of personification
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the elements least likely to form bonds are found in which group? 15 16…
D. 18
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which property do metalloids share with nonmetals? both are brittle. bo…
Both are brittle.
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chem ch 3.1 - 4 water is a mixture. true false
False
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introduction: the periodic table is so named because similar patterns r…
- Largest atoms: Lower left region - Smallest atoms: Upper right region - Highest ionization energy: Upper right region - Lowest ionization energy: Lower left region - Highest ele…
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read the excerpt from \sonnet 29\ when, in disgrace with fortune and me…
A. abab
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gases are the only form of matter that is easily compressible. true fal…
False
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which argument best explains the charge of an atomic nucleus? an atomic…
An atomic nucleus is positively charged because it is composed of protons.
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an amorphous solid has long range, repeating order. true false
False
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12. think and discuss: what is the relationship between electron affini…
As atomic radius increases, electron - affinity generally decreases. This occurs because with a larger atomic radius, the nucleus has a weaker attraction for an added electron due…
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the elements in group 17 of the periodic table are all called halogens.…
number of valence electrons
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which properties are characteristic of metalloids? high electrical cond…
C. intermediate conductivity and a high melting point
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what trend does the reactivity of most nonmetals show in a periodic tab…
C. increases from left to right across the periodic table
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the table below lists the properties of a metallic element. property sh…
Group 12
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which properties make a metal a good material to use for electrical wir…
B. conductivity and ductility
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read the rough - draft paragraph. (1) many people experience a sense of…
3
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while looking at xenon (xe) on the periodic table, a student needs to f…
A. directly up
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which statements describe elements of free - verse poetry? select all t…
A. does not follow a strict rhyme scheme or meter B. does have a natural rhythm and flow
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read the lines below from \musée des beaux arts.\ what most helps you t…
B. They have no fixed rhyme scheme.
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read the passage and answer the following question(s). passage 2122 dir…
C. phosphorus
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read the passage and answer the following question(s). passage 1867 dir…
A. aluminum
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what environmental disaster can be attributed to over - population and …
B. climate change due to the greenhouse effect
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part 3a 12 marks choose 4 of 5 (lesson 3a) draw the following ionic bon…
a) Formula: $Li_3P$
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the dreamers gather in neo beijings starlight district. the wanderers a…
who is unable to speak the local language
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cora wants to draw a model of an atom for her project for the science f…
The model that has 2 blue spheres in the nucleus (protons), 4 red spheres in the nucleus (neutrons), and 2 green spheres in the electron - shell is the correct one. Without specif…