化學
化學反應、化學計量、分子結構與元素性質。
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making predictions about reactions complete the following equations (no…
no reaction
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making predictions about reactions complete the following equations (no…
A. $\text{AlCl}_3 + \text{Ag}$
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limiting reactants da 1. given the reaction: $ce{s + o_{2} -> so_{2}}$ …
a) $219.76\ \text{g}$ b) $173.0\ \text{g}$ c) Oxygen d) $173.0\ \text{g}$
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phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 time remaini 57:55 h₂o…
from a gas to a liquid
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phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:16 i…
solid turns directly into a gas, matching the description. - Evaporation is liquid to gas, freezing is liquid to solid, deposition is gas to solid, so they do not fit.
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phase changes quiz complete 1 2 3 4 5 6 7 8 9 10 the diagram below show…
A. Molecules are speeding up as boiling occurs.
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2) what is the percent yield of the reaction below if 84.0 grams of $\t…
80.8%
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in this reaction: $ce{mg(s) + i_{2}(s) -> mgi_{2}(s)}$ if 10.0 g of mg …
Approximately 84.5%
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writing formulas ( criss-cross method)directions: write the formulas of…
| | $\text{F}^-$ | $\text{O}^{2-}$ | $\text{N}^{3-}$ | $\text{S}^{2-}$ | $\text{SO}_4^{2-}$ | |--|--|--|--|--|--| | $\text{Fe}^{3+}$ | $\text{FeF}_3$ | $\text{Fe}_2\text{O}_3$ | $…
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ionic bonding 6.1-6.3 test directions: using a periodic table, fill in …
| Number of Protons (+) | Number of Electrons (-) | Overall charge | Symbol and Charge | Cation (C) Anion (A) Neutral (N) | |------------------------|--------------------------|--…
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1 pointthe smoke inhaled from a burning cigarette contains a mix of ove…
1. 7000 2. 70 3. Melanoma
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name: homework phosphorus trichloride is a slightly yellow fuming liqui…
Lewis dot diagram for $\text{PCl}_3$: ``` .. :Cl:P:Cl: .. :Cl: .. ``` (Note: The central P has one lone pair, each Cl has three lone pairs, and single bonds connect P to each Cl.)…
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baking soda, or sodium bicarbonate, is used in baking to ______ foods l…
D. encourage
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baking soda, an alkaline chemical formula, is used in baking to make ca…
D. achieve
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if human minds were as uniform as atoms of the same elements or molecul…
C. predictable
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the third type of chemical bonding, metallic bonding, occurs between me…
- Valence electrons move freely throughout a metal. - Metallic bonding occurs between metal atoms.
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use the activity series below to predict the products of each of the fo…
NaCl + Ag
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1 point cigar users cannot be exposed to nicotine because they dont ful…
1. False 2. True 3. False
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making activity series predictions use the activity series below to pre…
NaCl + Ag
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chemistry resources ionic compounds can be represented by bohr model di…
A. A sodium cation has zero valence electrons. C. Both the Bohr model and the Lewis dot structure represent an ionic bond between a metal and a nonmetal. D. Valence electrons are …
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solids and plasmas quiz complete 1 2 3 4 5 6 7 8 9 10 which best explai…
cannot be pushed closer together, making the crystal incompressible. The other options are incorrect: solid molecules vibrate in place (so A is wrong), crystal molecules do not ac…
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chemistry resources covalent compounds can be represented by bohr model…
- There are two bonding electrons in a chlorine molecule. - A chlorine molecule has 14 total valence electrons.
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there are three types of chemical bonds: covalent, ionic, and metallic.…
A covalent bond forms between two **nonmetal** chlorine atoms. Before reacting, each chlorine atom has **7** valence electrons. When **2** electrons are shared, each chlorine atom…
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sodium metal (na), chlorine gas ($cl_2$) and table salt (nacl) have dif…
- electrons are transferred: bonds in table salt - electrons are shared: bond in chlorine gas
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1. $\boldsymbol{agno_2}$ |element|atoms|mass|total| | ---- | ---- | ---…
### $\text{AgNO}_3$ | Element | Atoms | Mass (g/mol) | Total (g/mol) | |---------|-------|--------------|---------------| | Ag | 1 | 107.87 | $1 \times 107.87 = 107.87$ | | N | 1 …
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1) what is the term for something that attaches dye molecules to textil…
1) A mordant is the substance 2) Iron produces dull, dark colors and can weaken fibers. 3) To remove impurities, concentrate active components, and ensure consistent, effective dy…
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when two atoms with different electronegativities form a bond, the more…
When sulfur and oxygen react, valence electrons are **shared** between the atoms because their EN difference is **less than** two. When magnesium and oxygen react, valence electro…
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chemistry resources when forming chemical bonds, metal atoms tend to lo…
- In general, metal atoms have lower electronegativities than nonmetal atoms. - When sulfur bonds to oxygen, electrons are more strongly attracted to the oxygen atom. - Atoms with…
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multiple choice questions 1. which process occurs in the suns core to r…
1. C. Nuclear fusion 2. B. Stellar life span model 3. C. Evidence of nuclear fusion and energy output 4. B. It began as a single, dense point and has been expanding ever since.
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chemical bonds form when atoms share valence electrons or when one atom…
- Oxygen atoms tend to gain or share electrons when forming chemical bonds. - Magnesium atoms tend to lose electrons when forming chemical bonds. - Atoms with three or fewer valen…
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empirical and molecular formula calculation propene has an empirical fo…
$\text{C}_3\text{H}_6$
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making activity series predictions think about it use the activity seri…
Ca₃(PO₄)₂ + Zn
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making activity series predictions use the activity series below to pre…
NaCl + Ag
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is an example of○ energy transformation○ law of conservation of energy○…
- Incomplete top question: Cannot be answered without the referenced scenario. - Energy type question: A. Chemical - Mass conversion question: 0.625 kg (the corresponding option, …
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select the correct answer a chemist is performing an experiment by obse…
C. from hour 0 to hour 5
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making activity series predictions use the activity series below to pre…
no reaction
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use the activity series below to predict the products of each of the fo…
NaCl + Ag
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making activity series predictions use the activity series below to pre…
B. $\text{K}_2\text{CO}_3 + \text{Na}$
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mass x gravity x height is the formula for *○ kinetic energy○ mechanica…
1. Gravitational Potential Energy 2. mass, velocity (speed) 3. Sorry, the text for the third question is incomplete. Please provide the full question details to answer it.
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a block has a mass of 23 grams and a volume of 10 cm³. using the table …
Glass
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reactions you may have noticed an (s) next to one of the products in so…
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. barium carbonate
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you may have noticed an (s) next to one of the products in some double …
1. $\text{CdS}$ 2. $\text{Fe(OH)}_3$ 3. $\text{BaCO}_3$
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1. a plastic toy with a mass of 18 g occupies 9 cm3 of space. its densi…
1. 2.0 g/cm3 2. 22 cm3 3. Cannot be solved: Required reference table is not provided.
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predict the products of the double replacement reactions given. check t…
$\text{BaSO}_4 \text{(s)} + \text{MgCl}_2$ (corresponding to the fourth option)
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11. what is the correct procedure for students to follow if a chemical …
11. c) Stand back and advise the teacher of the spill. 12. d) things in an experiment that don't change 13. b) Quantitative
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reactions predict the products of the double replacement reactions give…
$\text{NaNO}_3 + \text{AgCl (s)}$
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try it reactions predict the products for the single replacement reacti…
$\text{ZnCl}_2 + \text{H}_2$
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time re 56: glycerol boils a…
boils at a higher temperature than water, its intermolecular attractive forces must be stronger.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaini 56:31 which ter…
naturally mix without an agent, immiscible liquids do not mix on their own, and compressed molecules are unrelated to this mixing function.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what is produced on the top …
surface tension
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part 2: write out and balance: iron and oxygen react to form iron (iii)…
3. $160\ \text{g}$ (rounded to 2 significant figures) 4. $2.00\times10^{23}$ molecules
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remain 57:08 which proc…
boiling
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 57:30 carla m…
way that causes forward motion, it does not significantly increase water molecule kinetic energy to move the boat, and soap mixes with water (it is not immiscible) rather than for…
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liquids quiz complete 1 2 3 4 5 6 7 why are liquids well suited for hyd…
The other options are incorrect: liquid density is not the key factor, liquids do not change volume easily (they are incompressible), and the number of molecules is irrelevant to …
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predict the products for the single replacement reactions given. check …
$\text{CaCl}_2 + \text{Mg}$
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liquids quiz complete 1 2 3 4 5 6 7 8 9 which type of substance is wate…
" rule. It dissolves ionic substances by hydrating ions, and also dissolves polar substances via hydrogen bonding and dipole-dipole interactions.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 time remaining 58:54 the par…
Water particles have strong intermolecular forces.
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liquids quiz complete 1 2 3 4 5 6 7 8 9 10 what happens when a solid is…
olved solids (floating, sinking, suspending) rather than dissolution.
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temperature of chemical reactions over time 3. label the chemical react…
**Endothermic** - Citric acid and baking soda - Ammonium Chloride **Exothermic** - Calcium chloride - Sodium sulfate
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limiting reactions worksheet 3 part 1: first, write out and balance the…
Limiting reactant: $\text{P}_2\text{O}_5$; Mass of phosphoric acid: ~54 g --- ### Problem 2
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2 select the correct answer from each drop-down menu. complete the foll…
First blank: National Environmental Policy Act (NEPA) Second blank: Love Canal
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invitation if you are a dreamer, come in, if you are a dreamer, a wishe…
a. BAAABBB
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name: _________________________ percent comp. worksheet find the percen…
$\ce{Al2(SO4)3}$: Al: 15.77%, S: 28.12%, O: 56.11% $\ce{CuBr2}$: Cu: 28.45%, Br: 71.55% $\ce{NaOH}$: Na: 57.48%, O: 40.00%, H: 2.52% $\ce{(NH4)2S}$: N: 41.18%, H: 11.76%, S: 47.06…
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# 6 on the diagram fill in the phase changes in the blank provided. pha…
b. evaporation
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question 5 (1 point) # 5 on the diagram fill in the phase changes in th…
a. condensation
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# 6 on the diagram fill in the phase changes in the blank provided. pha…
b. evaporation
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# 3 on the diagram: fill in the phase changes in the blank provided. ph…
d. sublimation
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# 2 on the diagram: fill in the phase changes in the blank provided. ph…
a. freezing
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question 5 (1 point) # 5 on the diagram fill in the phase changes in th…
a. condensation
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select all the correct answers. which two scientific theories were deve…
- three laws of motion - law of gravity
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20 if a bond had a electrongativity of 1.7 and higher, what type of bon…
A. ionic bond
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chemistry unit 6 stoichiometry homework / notes packet limiting reactan…
1. Limiting reactant: Magnesium ($\text{Mg}$) 2. Mass of magnesium peroxide: $\approx 27.8$ grams
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30 which contains covalent bonds? zncl₂ k₂s co₂ nacl types of chemical …
CO₂
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which of these is an empirical formula? $ce{co_{2}}$ $ce{c_{3}h_{6}}$ $…
$\text{CO}_2$
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vitamin dthe down-low on vitamin dusing vitamin d to prevent bone lossb…
1. First blank: absorb (matches the function of vitamin D for calcium; note: if restricted to the dropdown, the intended functional term aligns with enabling the body to take in c…
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1) what is the honc 1234 rule? (5pts)(put answer here.)2) explain why o…
1) The HONC 1234 rule is a bonding guideline for common organic elements: Hydrogen (H) forms 1 covalent bond, Oxygen (O) forms 2 covalent bonds, Nitrogen (N) forms 3 covalent bond…
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lets write an elegy!!!! an elegy poem is a tribute to someone who has p…
**Elegy for Grandma Elara** The porch swing still sways where you used to sit, (A) Your teacup’s faint ring on the oak still stays, (B) I trace the faint cracks where your fingers…
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stoichiometry & limiting reproblem5. $2\\ hi + ca(oh)_2 \ ightarrow cal…
2.16 grams
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4. $4fe + 3o_2 \ ightarrow 2fe_2o_3$ if 4.7 grams of $fe_2o_3$ (molar m…
Approximately 3.3 grams (or 3.28 grams) of Fe were reacted.
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18. valence electrons are found in the nucleus. true / false 19. the ma…
18. False 19. True 20. False
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elaborate on the reason why heating water up will increase the rate of …
D. The average kinetic energy of the molecules that make up the solution also increases with increasing temperature. This increase in kinetic energy allows the solvent molecules t…
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when a mixture is stirred a the rate of dissolving stops. b the rate of…
B. the rate of dissolving will increase.
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1. a solution is a mixture. the part of the solution in the greater amo…
1. B. solvent 2. A. stir the sugar in the tea 3. A. contact between the solvent and solute
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2. 17.80 grams of naoh is mixed with 15.40 grams of $h_3po_4$$3naoh_{(a…
2a. $\approx 24.3$ grams of $\text{Na}_3\text{PO}_4$ can be formed 2b. The limiting reactant is $\text{NaOH}$ 3a. $\approx 192$ grams of disulfur dichloride is produced 3b. The li…
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4. $\boldsymbol{6 na_{(s)} + fe_{2}o_{3 (s)} ightarrow 3 na_{2}o_{(s)} …
4. a. $\text{Fe}_2\text{O}_3$ b. $\text{Na}$ 5. a. $71.6\ \text{grams}$ Limiting reactant: $\text{AgNO}_3$ Excess reactant: $\text{KBr}$
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4. record the different types of evidence that indicate a chemical chan…
1. Color change (e.g., rust forming on iron, a blue solution turning clear) 2. Formation of a precipitate (a solid forming from mixing two liquids) 3. Gas production (bubbles, fiz…
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what is most closely the meaning of maneuvers in the passage below (par…
A. schemes
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10. a compound is discovered that is 64.9% carbon, 13.5% hydrogen, and …
Empirical formula: $\text{C}_4\text{H}_{10}\text{O}$ Molecular formula: $\text{C}_4\text{H}_{10}\text{O}$
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if the empirical formula is ch and the molar mass is 78 g/mol, what is …
$\text{C}_6\text{H}_6$
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practice: determining formulas part 1: determine the empirical formula,…
1. Empirical formula for magnesium-bromine compound: $\text{MgBr}_2$ 2. Empirical formula for carbon-hydrogen compound: $\text{CH}_4$
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11/02/26 q6) write short note on chemical bonding q16) give the types o…
1. **Q6**: Chemical bonding is the attractive force that holds atoms, ions, or molecules together to form stable chemical compounds, driven by interactions between valence electro…
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1. in any solution, the part in the greatest quantity or volume is call…
1. B. solvent 2. A. liquid-solid 3. gas-gas
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chapter review (continued)directions: find the mistakes in the statemen…
11. A burning candle is undergoing a chemical change. 12. Removing salt from water by heating the water until it vaporizes and leaves the salt behind is called evaporation. 13. An…
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reviewpart a. vocabulary reviewdirections: use the clues below to compl…
### Completed Crossword Answers: Across: 1. PHYSICAL 3. COMPOUND 4. HETEROGENEOUS 6. SUSPENSION 7. COLLOID 9. MIXTURE 10. SOLUTION Down: 2. HOMOGENEOUS 5. ELEMENT 8. TYNDALL 9. MA…
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lines 21-24 a. write: how is this stanza similar to stanza 1 (lines 1-4…
1. Rhyme scheme labeling (lines 21-43): Lines 21-24: A, B, A, B Lines 25-28: C, C, D, D Lines 29-32: E, F, E, F Lines 33-34: G, G Lines 35-38: H, I, H, I Lines 39-43: J, K, L, L, …
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directions: below are two sets of words. complete the second set by cho…
1. ice 2. solubility 3. condensation 4. flammable 5. air 6. iron 7. burning logs 8. wire 9. A physical change only changes a substance's physical form (no new substance is formed)…
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is a. $8g$ b. $4g$ c. $g$ d. $16g$ 10. an aeroplane gets its upward lif…
10. b. Bernoulli's principle 11. c. Kinetic energy is maximum, potential energy is minimum 12. a. $\lambda/4$ 13. a. Both A and R are true and R is the correct explanation of A. 1…
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order these compounds based on the strength of the dipole-dipole forces…
D. $\text{HCl} > \text{HBr} > \text{HI}$
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identify the correct dipole for the c$-$br bond in the lewis structure …
II. $\ce{H - \underset{\underset{H}{|}}{C} - H}$ with arrow pointing from C to Br (positive end on C, arrowhead on Br)
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which has the correct name-formula combination? answer: a chlorine pent…
C. carbon tetraiodide - $\text{CI}_4$