化学
化学反应、化学计量、分子结构与元素性质。
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what type of footwear protects you from chemicals and provides extra tr…
Rubber boots
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post lab questions 1. what is the mole ratio of hydrogen peroxide to pe…
No, because it is more important to know the density of $H_2O_2$ in order to find the mass %. ### 2b
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what determines how much, if any, of a solute is dissolved? application…
C. saturation
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study the sentence below. then, choose the type of error that the sente…
# Breve explicación: El nombre de una materia ("Chemistry") y el nombre de un idioma ("german") deben ser escritos con mayúscula inicial. La palabra "german" está mal capitalizada…
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which atmospheric gas is the lightest because it only has one proton an…
C. hydrogen
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study the sentence below. then, choose the type of error that the sente…
# Bre[SSE Completed, Client Connection Error][SSE Completed, Client Connection Error][LLM SSE On Failure]
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model 2 - prefixes and suffixes prefix numerical value mono- 1 di- 2 tr…
7) -ide 8) When there is only one atom of the first element in the compound. 9) Phosphorus tribromide, Sulfur tetrachloride, Dinitrogen difluoride, Sulfur trioxide, Bromine monofl…
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15. chemistry a lab technician has 40 gallons of a 15% iodine solution.…
10 gallons
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6) examine the prefixes in model 2 below. fill in the numerical value t…
6) mono -: 1, di -: 2, tri -: 3, tetra -: 4, penta -: 5, hexa -: 6, hepta -: 7, octa -: 8, nona -: 9, deca -: 10 7) -ide 8) When there is only one atom of the first - named elemen…
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the breaking of chemical bonds ______ energy, while the forming of bond…
B. absorbs; releases
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why? when you began chemistry class this year, you probably already kne…
1. | Molecular Formula | Number of Atoms of First Element | Number of Atoms of Second Element | | ---- | ---- | ---- | | $ClF$ | 1 | 1 | | $ClF_5$ | 1 | 5 | | $CO$ | 1 | 1 | | $CO…
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is the study of energy changes that occur during chemical reactions and…
Thermochemistry
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electron configuration & orbital practice which of the following is the…
Because the s sublevel within the 2nd energy level exceeded the maximum # of electrons
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electron configuration & orbital practice the following electron config…
C. 20, Calcium
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4. characterize the substances below with the help of their respective …
A. Molecular, Ionic, Metallic, Molecular
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11 multiple choice 1 point use the given ion charges to determine the f…
$(NH_4)_3(PO_4)$
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10 multiple choice 1 point use the given ion charges to determine the f…
Ni(NO_3)_2 (last option)
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3. a series of substances have the same chemical formula (c28h44o, 396.…
a) Ergosterol
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9 multiple choice 1 point use the given ion charges to determine the fo…
D. $CrO_2$
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8 multiple choice 1 point use the given ion charges to determine the fo…
Li(OH)
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multiple choice 1 point use the given ion charges to determine the form…
B. $Al_2(SO_4)_3$
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why? when you began chemistry class this year, you probably already kne…
1) For $ClF$: 1 chlorine atom, 1 fluorine atom; for $ClF_5$: 1 chlorine atom, 5 fluorine atoms; for $CO$: 1 carbon atom, 1 oxygen atom; for $CO_2$: 1 carbon atom, 2 oxygen atoms; …
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6 multiple choice 1 point use the given ion charges to determine the fo…
D. CaS
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5 multiple choice 1 point use the given ion charges to determine the fo…
A. SrBr₂
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2. in which of the following pure substances will hydrogen bonding be a…
a) 2 and 3
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4 fill in the blank 1 point name the following compound: gacl3 use only…
gallium trichloride
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why? when you began chemistry class this year, you probably already kne…
1. See filled - in table above. 2. 2 non - metals; molecular compounds. 3. Use of prefixes to indicate number of atoms. 4. Different numbers of fluorine atoms; need prefixes for d…
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the smallest unit of an element that retains its chemical properties, c…
1. Atom 2. Octet rule 3. Isotopes 4. Atomic mass 5. Atomic number 6. Cation 7. Ion 8. Anion
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3 fill in the blank 1 point name the following compound: ca3n2 use only…
calcium nitride
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match conducted the gold foil experiment, which revealed the existence …
1. Ernest Rutherford 2. John Dalton 3. James Chadwick 4. Erwin Schrödinger 5. Niels Bohr 6. J. J. Thomson
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isotope protons neutrons electrons mg - 24 12 12 12 mg - 25 12 13 12 mg…
1. Magnesium 2. Mg - 24; the atomic mass of magnesium (24.4 amu) is closest to the mass of Mg - 24 (24 amu) Reflection 1: Isotopes have same protons but different neutrons. Reflec…
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9/25/25, 9:15 am exam 1 22. part a an atom with an atomic number of 10 …
22. 14 neutrons 23. False 24. False 25. There is one carbon and four hydrogen atoms. 26. True 27. True
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daniela wrote a table comparing pure substances and mixtures. pure subs…
A. Mixtures are substances that are not chemically combined.
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9/25/25, 9:15 am exam 1 28. part a which of the following is chemically…
28. neon (atomic number 10) 29. one 30. ionic 31. False 32. False 33. True
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the illustration below, taken from the periodic table, provides informa…
D. to the left of calcium
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short answer q 13. which letter in the phase diagram below best represe…
(i) G (ii) F
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the goal of your paper is to provide information about one scientists l…
I would choose Marie Curie. Her life was filled with remarkable achievements and challenges, and her contributions to the understanding of the atom through her work on radioactivi…
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the heat transferred to the ice increases the thermal energy of the mol…
When heat is added to ice, the increased thermal energy weakens intermolecular forces, allowing water - molecules to move more freely and change from a solid to a liquid state.
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when e - cigarette metal coils heat up to turn e - liquids into aerosol…
D. All of the above
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during an experiment, lithium (li) was combined with fluorine (f) to fo…
1. Ionic compound. Because lithium is a metal and fluorine is a non - metal and they form an ionic bond through electron transfer. 2. Group 17. As it has 7 valence electrons. 3. F…
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an element on the periodic table is in group 17 and period 4. which of …
The element has 4 energy levels and is in the p - block.
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the coefficient for the d - block is always so on the 4th row of the pe…
Atomic number of aluminum: 13 Longhand Configuration: 1s²2s²2p⁶3s²3p¹ Shorthand Configuration: [Ne]3s²3p¹
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a scientist working on the problem of sustainable energy measures the e…
C. Reaction B is most likely nuclear fusion, where two smaller atoms collide at great speed and fuse to form a larger atom. Reaction C is most likely a chemical reaction, while A …
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question 10 according to professor dave (in the video), carbon - carbon…
C. strong enough to be stable, but not so strong that they can't break and rearrange
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which of the following is a type of bond in which one pair (2 electrons…
For the first question: C. single bond For the second question: C. triple bond
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pro tip: for neutral atoms, if you add up it will match the number of i…
- What is the electron configuration for sulfur (S)? $1s^{2}2s^{2}2p^{6}3s^{2}3p^{4}$ - When writing a shorthand, or condensed, electron configuration, which Noble Gas do you alwa…
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scenario 1: medical isotopes (carbon - 14) doctors use carbon - 14 to t…
| Isotope | Protons | Neutrons | Electrons | | ---- | ---- | ---- | ---- | | Carbon - 12 | 6 | 6 | 6 | | Carbon - 13 | 6 | 7 | 6 | | Carbon - 14 | 6 | 8 | 6 | Carbon - 14 is still…
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question 6 why is carbon chemically important? (select all that apply) …
Question 6: A. carbon can easily bond with itself to form long chains, B. carbon can easily bond with hydrogen, oxygen, nitrogen, phosphorus and sulfur, C. carbon has 4 valence el…
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write the information about the parts of electron configurations below.…
| Part | Part Represents | Example of H = 1s¹ | |--|--|--| | Coefficient | Principal energy level | 1 | | Letter | Orbital type | s | | Exponent | Number of electrons in orbital |…
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question 1 a water molecule is made up of one oxygen and two hydrogen a…
Question 1: C. covalent Question 2: A. Water is able to dissolve many substances.
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english crossword puzzle grade across 4. a type of punctuation mark tha…
Across: 4. Apostrophe 5. Abstract noun 9. Phrase 10. Onomatopoeia 13. Rhyme 14. Simile 15. Sentence Down: 1. Paragraph 2. Metaphor 3. Alliteration 6. Personification 7. Dictionary…
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327 chemistry prep ii unit 1 ch 3 test name: anisine collins read and i…
1. If copper (Cu) is selected: Element; Color (intensive); Ability to react with oxygen (chemical property) 2. See the filled - in table above for states of matter properties. 3. …
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which would be the correct noble gas configuration for aluminum (al)? n…
O [Ne] 3s² 3p¹
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case file chemical name: toulene common uses: this chemical is used as …
This chemical is used as a solvent in paints
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case file chemical name: propylene glycol common uses: this chemical ab…
Inhaling something containing the chemical
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case file chemical name: propanal common uses: this chemical is used to…
The respiratory system
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when writing electron configurations, you always start with and work yo…
When writing electron configurations, you always start with the lowest - energy orbital (1s) and work your way over from lower - energy orbitals to higher - energy orbitals until …
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which sublevel below would be filled last by electrons? o 1s o 4p o 5d …
C. 5d
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case file chemical name: phenol common uses: this chemical is used as a…
This chemical clears the lungs when you have a cold
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which of the following shows the most likely orbital configuration for …
The third option (with 2 electrons in 1s, 2 in 2s, and 5 in 2p with the correct spin - pairing and single - occupancy according to Hund's rule) shows the correct orbital configura…
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case file chemical name: diethylene glycol common uses: this chemical i…
This chemical is used to make polyurethanes.
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127 chemistry prep b unit 1 ch. 3 test multiple choice: read each quest…
1. d. Both a and b 2. c. Volume 3. c. Reactants 4. b. Freezing 5. d. Energy 6. c. Burning 7. c. Melting chocolate 8. e. Sublimation 9. c. Mass 10. d. anything that has mass and ta…
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warning chemical has been detected to synchronize the lasers and target…
There is not enough information to determine the correct answer among the options provided.
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what would be the most accurate electron configuration model for a neut…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p⁴
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warning chemical has been detected to synchronize the lasers and target…
This chemical can cause fluid to build up in the lungs
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which of the following elements are most likely similar in physical and…
D. Mg and Ba
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what do you notice about the connection between the number of orbitals …
1. Each orbital can hold 2 electrons, so the number of electrons a shell can hold is 2 times the number of orbitals in that shell. 2. Helium has its outermost electrons in the 1s …
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how many valence electrons are in an atom of gallium (ga), which has th…
B. 3
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which of the following electron transitions (energy transition) in the …
Moving from Level 2 to Level 1
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how many electrons can fill the lowest energy level of an argon atom? 2…
A. 2
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how does nicotine in tobacco products affect the brain? enhances mood l…
Leads to changes in brain chemistry
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what would be the result of increasing the number of protons in an atom…
The atom would be a different element.
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which of the following atoms would be electrically neutral? o 10 proton…
5 protons, 10 neutrons, 5 electrons
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silicon is the second most abundant element in the earths crust. it is …
28.1 amu
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which of the following best represents a pair of isotopes? carbon-12 an…
Carbon-12 and Carbon-14
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the image below shows an isotope of lithium. write the isotope notation…
A. $^{7}_{3}\text{Li}$
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iclicker: how much energy is required to vaporize 32.9 g of ethanol at …
A. 29.0 kJ
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lesson: secondhand smoke secondhand smoke contains more than chemicals,…
First blank: 7,000 Second blank: 70 Third blank: Hundreds
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t/f (change false statements to be true) 1. in a physical change, a sub…
1. False. In a physical change, a substance's composition does not change. 2. False. Density is an intensive physical property. 3. False. Cutting a piece of paper is a physical ch…
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9. describe the results of a physical change and list three examples of…
9. Results: Change in physical properties, composition unchanged. Examples: melting ice, tearing paper, bending metal. 10. Results: New substances formed. Examples: rusting iron, …
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chemistry unit 1b practice ws#2 name daniya turner section 3.1 properti…
a. Chemical b. Physical c. Chemical d. Physical e. Physical f. Chemical
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5. a solution is prepared by dissolving 5.00 g of potassium nitrate (kn…
$0.309\ M$ ### 5b. % mass of KNO₃ in the solution
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mrs. jacksons science class is learning about how baking soda and vineg…
$1\frac{2}{7}$ liters
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what does it mean if elements are in the same group? what does it mean …
If elements are in the same period, it means they have the same principal energy level. If elements are in the same group, it means they have the same number of valence electrons.
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what information do you get from each element on the periodic table? wh…
- Information from carbon's periodic - table entry: Atomic number (6, number of protons), atomic mass (12.011). - Elements in the same group: Same number of valence electrons, sim…
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2. complete and write the overall chemical equation, the complete ionic…
**2.a)** - Overall Chemical Equation: $KOH(aq)+HCl(aq) ightarrow KCl(aq) + H_2O(l)$ - Complete Ionic Equation: $K^+(aq)+OH^-(aq)+H^+(aq)+Cl^-(aq) ightarrow K^+(aq)+Cl^-(aq)+H_2O(l…
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1. write a balanced equation for the reaction of kmno₄ with h₂o₂ in the…
# Explanation: ## Step1: Write balanced chemical equation The reaction is a redox - reaction. The balanced equation is $2KMnO_4 + 5H_2O_2+ 3H_2SO_4=K_2SO_4 + 2MnSO_4+ 5O_2\uparrow…
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write an analysis explaining how john masefields poem sea fever is writ…
"Sea - Fever" has a structured form with four quatrains, an ABAB rhyme scheme in each stanza, and a regular meter using iambic feet.
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i must go down to the seas again, to the vagrant gypsy life, to the gul…
EEFF
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in colder climate regions, lakes and ponds freeze in the winter. the so…
Water molecules arrange themselves in a structure with more space between them, making the ice less dense and causing it to float.
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1. predict the products of the following reactions. identify the precip…
| Chemical Reactions | Precipitate | Spectator Ions | Net Ionic Equation | | ---- | ---- | ---- | ---- | | a. $AgNO_3(aq)+NaBr(aq) ightarrow$ | $AgBr$ | $Na^+,NO_3^-$ | $Ag^+(aq)+…
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which kind of matter is each sample? sample 1 sample 2 sample 3 element…
Sample 1: Mixture Sample 2: Element Sample 3: Element
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how many protons are there in an atom of silver? 47 60 107
47
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what is the atomic mass number of silver? 107 47 ag
107
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what is the atomic number of silver?
47
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select all that apply: what is the mass of the 2 silver isotopes 108 10…
B. 107, C. 109
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which statement best describes the direction of heat flow by conduction…
Heat flows from faster molecules to slower molecules when they collide.
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which kind of matter is each sample? sample 1 sample 2 sample 3 element…
Sample 1: Element Sample 2: Mixture Sample 3: Compound
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which of the following is true of cigarette smoking and cancer? cigaret…
C. Cigarette smoke contains cocarcinogens that combine with other chemicals to cause cancer.
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1 identify the solution, solvent, and solute shown in the homogenous mi…
1. Salt: Solute. Justification: Dissolves in water, present in smaller amount. Water: Solvent. Justification: Dissolves salt, present in larger amount. Salt water: Solution. Justi…