化学
化学反应、化学计量、分子结构与元素性质。
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in a double - replacement reaction, hydrogen chloride and sodium hydrox…
D. water
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how is the crystal lattice of an ionic compound different from the crys…
C. A metallic compound forms a crystal structure because the shared electrons move freely in a lattice of fixed positive ions and exerts an attractive force on the metal's nuclei.…
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what do the pink - colored blocks indicate? noble gases representative …
representative groups
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which choices are physical properties describing an ionic compound? (se…
B. high melting and boiling points C. crystal structure D. hard and brittle
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what does a period represent in the periodic table? horizontal row seri…
A. horizontal row
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what statement correctly describes the properties of nonmetals? (select…
higher ionization energy and greater electronegativity brittle and poor conductors of electricity in their solid state
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what does a period represent in the periodic table? horizontal row seri…
A. horizontal row
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what do the red - colored blocks indicate? alkali metals noble gases al…
non - metals
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which of these elements is a transition metal? mercury arsenic barium m…
mercury
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what do the green - colored blocks indicate? alkali metals noble gases …
alkaline metals
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multiple choice 1 point in writing an equation that produces hydrogen g…
B. $H_2$
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26. select the answer from the menu. the natural - isotope abundance of…
63.6
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question 6 of 10 the half - life of iodine - 131 is 8 days. if a sample…
D. 0.24 g
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25. the diameter of neutral atoms generally decreases going left to rig…
The attractive force between the protons and electrons increases.
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23. some physical properties of elements in a group of the periodic tab…
Halogens
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for each molecule of glucose, how many carbon dioxide molecules are pro…
C. 6
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6 multiple choice 1 point what are the products for the reaction of: zn…
D. $Ag + Zn(NO_3)_2$
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21. the natural isotope abundance of sulfur is shown on the table. what…
32.09 amu
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20. why does the element potassium (k) readily form compounds? group 1 …
Losing one electron creates a stable electron arrangement.
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which of the following chemical equations below correspond to the parti…
$Zn + 2HCl ightarrow ZnCl_2 + H_2$
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after mendeleev constructed the periodic table, he predicted the discov…
chemical and physical properties
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look at the following chemical reaction. decide which of the following …
formation of a precipitant, color change
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section 2.2 assessment reviewing concepts 1. list seven examples of phy…
1. **Answer - Explanation Format for Question 1**: - # Brief Explanations: - Physical properties are characteristics of a substance that can be observed or measured without changi…
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review the following excerpt: it was many and many a year ago, in a kin…
A. ababcb
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16. the atomic number of aluminum is 13. what is the correct designatio…
1s²2s²2p⁶3s²3p¹
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multiple choice 1 point which of the following is the equation for the …
Zn(s) + Br₂(l) → ZnBr₂(s) (the third option in the multiple - choice list)
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14. which of these statements is one of the conclusions that formed the…
Atoms are the smallest particles of matter and cannot be divided farther.
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12. which statement explains whether nacl or beo will have a stronger b…
BeO will have a stronger bond because it has a larger ionic charge, and a smaller distance between ions.
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where art thou, muse, that thou forgetst so long to speak of that which…
- three quatrains and one couplet - lines of poetry with five metrical feet - unstressed and stressed syllable groups
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10. fluorine, chlorine, bromine, and iodine all have the same number of…
C. fluorine
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2 multiple choice 1 point use the following balanced equation. which on…
Two molecules of $H_2$ will produce one molecule of $H_2O$
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13. the number of significant figures in the measurement 170.040 km is …
13. 6 14. 2 15. 0.026 g 16. 111.0 mm 17. 1.246×10⁸ 18. 12.7 m 19. 11 mm² 20. 347 km 21. 3 m 22. 4.1 cm³ 23. 2.5 g 24. 1.54×10⁻¹⁰ m 25. 5.008×10³ km 27. 3.45×10⁶ mg 28. 63.4 g
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7. a particular atom or ion has an electron configuration of kr5s²4d¹⁰.…
In$^{+}$
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what are some characteristics of noble gases? select two correct answer…
Noble gases belong to group 18 of the periodic table. Noble gases are not reactive with other elements.
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30. which of the following has the same number of electrons as neon (ne…
A. $Na^+$, B. $O^{2 -}$, D. $Mg^{2+}$
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28. which sublevel contains the greatest number of orbitals? * a. 2p b.…
D. 4f
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metallics form a diagonal staircase separating metals from nonmetals. 5…
5. Metallic character decreases across a period and increases down a group. 6. Surprising results may depend on free - electron presence in element structure. Conductors have delo…
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21. write the number of protons, neutrons, and electrons for cl - 37. *…
A. 17 p, 20 n, 17 e
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3. a sample of element x is found to contain 72.15% of isotope type 1 (…
85.47 amu
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which of the following materials cannot be broken down into a simpler f…
B. element
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under certain conditions, 100 g of copper reacts with 25 g of oxygen to…
A. Law of Multiple Proportions
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2. the reactivity trends on the periodic table depends on valence elect…
17
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in dominiques chemistry class, the final grade is based on four categor…
$66.55$
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1. which of the following shows a correct lewis dot structure? •al• •si…
$\cdot Si\cdot$
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name: troy peace class: 4 even date: 9/8/25 test 1.2 and 2.3 general ch…
1. d. kilogram 2. a. second 3. a. depends on its location 4. d. all nonzero digits are significant 5. b. 3 6. a. 7.30×10⁻⁷ km 7. a. 0.00400 L 8. c. 30.00 mm 9. b. 42,800 10. a. 9.…
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balance each equation and list the coefficients in the balanced equatio…
A. 3, 1, 1 B. 2, 3, 2
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analyze and interpret data 1. sep interpret data which elements would y…
1. Elements on the left - hand side and in the middle of the periodic table (such as sodium, iron, copper) are metallic. Reason: They exhibit properties like high electrical condu…
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where art thou, muse, that thou forgetst so long to speak of that which…
The rhyme scheme is abab cdcd efef gg. The regular rhyme scheme makes the sonnet sound musical and memorable.
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brenda fills in the table below to organize information about the gas l…
1, 4, and 6
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read the following excerpt from a sonnet by william shakespeare: when i…
B. abab
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what type of meter does a blank verse poem use? a. no set rhyme scheme …
C. Unrhymed iambic pentameter
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what was the basis for moseleys periodic table? atomic number number of…
Atomic Number
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read the following excerpt from a poem: and thou art dead, as young and…
A. abba
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dobereiner noted triads of elements. what was important about the triad…
The middle element had a mass approximately half - way between the lighter and heavier of the triad.
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argon (atomic number 18) has a mass of 39.95 amu. potassium (atomic num…
potassium
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what was the basis for mendeleevs periodic table? atomic number atomic …
B. Atomic Mass
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what did newlands \law of octaves\ demonstrate? every third mass had di…
D. Every eighth mass had similar chemical and physical properties.
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while scuba diving with some friends, deshawn notices that the air bubb…
The air bubbles increase in size because the pressure exerted by the water decreases as they rise. Boyle's law explains this phenomenon.
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complete the orbital diagram for the element zinc blank orbital diagram…
1s: ↑↓ 2s: ↑↓ 2p: ↑↓ ↑↓ ↑↓ 3s: ↑↓ 3p: ↑↓ ↑↓ ↑↓ 4s: ↑↓ 3d: ↑↓ ↑↓ ↑↓ ↑↓ ↑↓ 4p: (empty) 5s: (empty) and so on for higher - energy orbitals.
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match each rhyme scheme to the correct portion of the sonnet. 99 efef a…
gg - couplet efef - third quatrain abab - first quatrain cdcd - second quatrain
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complete the orbital diagram for the element oxygen blank orbital diagr…
1s: ↑↓ 2s: ↑↓ 2p: ↑ ↑ ↑↓
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complete the orbital diagram for the element aluminum blank orbital dia…
1s: $\uparrow\downarrow$ 2s: $\uparrow\downarrow$ 2p: $\uparrow\downarrow$ $\uparrow\downarrow$ $\uparrow\downarrow$ 3s: $\uparrow\downarrow$ 3p: $\uparrow$
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complete the orbital diagram for the element nitrogen blank orbital dia…
1s: ↑↓ 2s: ↑↓ 2p: ↑ ↑ ↑
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based on the electron configuration, how many valence electrons are in …
2
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what element has an electron configuration of kr 5s² 4d¹⁰ 5p³? bi p sb i
C. Sb
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what is the shorthand or noble gas electron configuration for tellurium…
[Kr] 5s²4d¹⁰5p⁴
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which orbital diagram correctly represents fluorine (atomic number 9)?
The second orbital diagram (with $\uparrow\downarrow$ in $1s$, $\uparrow\downarrow$ in $2s$, and $\uparrow\downarrow\uparrow\downarrow\uparrow$ in $2p$) is correct.
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how many electrons can the second energy level hold? 18 2 8 32
8
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what is the approximate shape of the \s\ orbital? spherical four - lobe…
A. spherical
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which of the following electron models is the one currently accepted by…
Schrodinger's Quantum Mechanical Model
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which of the following is the correct bohr model for sodium, na?
The Bohr model with 2 electrons in the first shell, 8 electrons in the second shell, and 1 electron in the third shell around a nucleus with 11 protons and 12 neutrons.
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what is the mass of 0.3 mol of kmno4? molar mass kmno4 = 158.04 g/mol 0…
$47.412$
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what is the mass of 0.8 mol of nahco3? molar mass nahco3 = 84.01 g/mol …
67.208 g
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what is the mass of 0.25 mol of koh? molar mass koh = 56.11 g/mol 0.25 …
$14.03\ g$ (rounded to two decimal - places)
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what is the mass of 0.2 mol of ccl4? molar mass ccl4 = 153.81 g/mol 0.2…
$30.762$
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what is the mass of 0.7 mol of h2so4? molar mass h2so4 = 98.09 g/mol 0.…
$68.663$
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19. which group was particularly targeted by the catholic inquisition? …
19. d. All of the above 20. d. Antoine Lavoisier
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20 a large asteroid impact at chicxulub, mexico might have wiped out th…
20. A. Nickel (The Chicxulub impact is linked to nickel - rich deposits) 21. A. If it happened in the past, it could happen again (Based on the historical evidence of asteroid imp…
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what causes the aurora borealis (northern lights)? illustrate the capti…
The aurora borealis is caused by solar storms emitting charged - particle clouds that interact with Earth's magnetic field and atmosphere, making atmospheric atoms and molecules g…
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how the earth was made: asteroids video questions how the earth was mad…
1. B. Washington Monument 2. A. Observing the moon through his telescope 3. A. They were almost pure iron 4. B. Fine pulverized rock 5. B. Shatter cones 6. A. traumatized 7. C. 50…
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a physical science student is studying the number of subatomic particle…
The atomic number can be subtracted from the atomic mass.
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a student is conducting an experiment to observe how different climates…
B. Rocks near the equator weather rapidly because of high temperatures and frequent rainfall, which enhance chemical weathering.
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a geologist is studying the process of soil formation in a region with …
High levels of volcanic ash deposition
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a student wants to determine whether an unknown solid is an ionic compo…
He is incorrect, because water can dissolve ionic solids.
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question 26 (multiple choice worth 3 points) (04.03r mc) which is a che…
D. Reacts with oxygen
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water and ammonium nitrate (nh₄no₃) react in an endothermic reaction in…
The beaker will get colder.
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which process is responsible for the formation or expansion of cracks a…
This damage is caused by frost wedging, which is due to mechanical properties, leading to the expansion of cracks and potholes.
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question 23 (multiple choice worth 3 points) (05.06r mc) which is a not…
B. Which base is the most exciting to study?
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question 22 (multiple choice worth 3 points) (05.02r mc) which best des…
They form an ionic bond by exchanging two electrons.
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how are chemical and physical changes different on a molecular level? c…
Chemical changes involve the breaking of chemical bonds.
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the reaction shown below is used living organisms to create heat and en…
Yes, because the catalyst can speed up the reaction by lowering the activation energy.
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which element has a larger atomic number than silver (ag)? pd cu ni hg
Hg
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question 18 (multiple choice worth 3 points) (05.04r mc) why does water…
Hydrogen bonding keeps water molecules close together.
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question 17 (multiple choice worth 3 points) (05.05r mc) which characte…
Sour taste
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question 16 (multiple choice worth 3 points) (05.03r lc) which molecule…
SmCl₃
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about my element - element name: copper symbol m or nm? atomic mass ato…
| Symbol | M or NM? | Atomic Mass | Atomic Number | # of Neutrons | Group Number | # Valence Electrons | Period Number | | ---- | ---- | ---- | ---- | ---- | ---- | ---- | ---- | …
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how do elements change as you move to the right along a row in the peri…
The average atomic mass increases.
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donna is studying phase changes. she claims that since the three phases…
Molecules gain or lose energy during any temperature change, not just phase changes.
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calcium chloride is as an ice - melting compound on sidewalks and city …
El cloruro de calcio libera calor al disolverse (proceso exotérmico) y este calor ayuda a fundir el hielo, un proceso endotérmico que requiere energía.
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a scientist mixes an unknown powder into a beaker of water. he then use…
The unknown powder decreased the hydrogen ion concentration of the water.