化学
化学反応、化学量論、分子構造、元素の性質。
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which of these is the correct lewis structure for hydrogen peroxide, h₂…
The third option (the one with the structure \(H - \overset{\cdot \cdot}{O}-\overset{\cdot \cdot}{O}-H\) where the two oxygen atoms are bonded together and each is bonded to a hyd…
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which of these is the correct lewis structure for methanol, ch₃oh? four…
The first option (the top - most Lewis structure with the unselected circle initially, showing \( \text{H} \) atoms bonded to \( \text{C} \), \( \text{C} \) bonded to \( \text{O} …
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5) kmno₄ k: ______ mn: ______ o: ______ 6) hcl h: ______ cl: ______ 7) …
5) K: 1; Mn: 1; O: 4 6) H: 1; Cl: 1 7) Mg: 1; N: 2; O: 6 8) N: 3; H: 12; O: 4; P: 1 9) Al: 2; S: 3; O: 12
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91. calculate the root mean square velocity and kinetic energy of f₂, c…
### Root Mean Square Velocity: Order (highest to lowest): \( \boldsymbol{\text{F}_2 > \text{Cl}_2 > \text{Br}_2} \) (inversely proportional to \( \sqrt{\text{molar mass}} \)). ###…
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percent composition worksheet ii find the percent compositions of all o…
### 2) $\ce{NaOH}$ $\ce{Na}$: $\approx 57.48\%$ $\ce{O}$: $40.00\%$ $\ce{H}$: $\approx 2.52\%$ ### 3) $\ce{(NH4)2S}$ $\ce{N}$: $\approx 41.12\%$ $\ce{H}$: $\approx 11.83\%$ $\ce{S…
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use the image on the right to answer the next two questions. 16. identi…
- **Similarities**: All have 1 valence electron; show tendency to form +1 ions (except H in some reactions); belong to Group 1. - **Differences**: Number of electron shells increa…
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use the image on the right to answer the next two questions. 11. identi…
The subfield is Chemistry (under Natural Science).
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click on the \wide\ tab again to revert back to the compressed version …
### Part 1: Completing the Table (Atomic Numbers and Atomic Masses) To complete the table, we refer to the periodic table for each element: | Symbol | Atomic Number | Atomic Mass …
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12. what is arsenic, classified as? (metal, non metal or metalloid?) 13…
metalloid ### Question 13
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87. chlorine gas reacts with fluorine gas to form chlorine trifluoride.…
The theoretical yield of \( \text{ClF}_3 \) is approximately \( \boldsymbol{4.82 \, \text{g}} \) (limiting reactant is \( \text{F}_2 \))
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periodic table trends electronegativity and ionization energy trend. 9.…
Electronegativity is the tendency of an atom to attract bonded electrons towards itself. ### For question 9b (Define Ionization Energy):
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9. go to the interactive periodic table and indicate the type of elemen…
Type of elements: b. Non metals Element symbols (example, depending on table): H, He, C, N, O, F, Ne (exact symbols depend on the specific interactive table's neon - green - coded…
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elements can also be classified by family, using the color coding at th…
Number of elements: 6 Member elements (symbols): Li, Na, K, Rb, Cs, Fr ### Question 8a
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integrated science fall final review guide terms to know 1. phenomenon …
For question 4: A group is a vertical column (e.g., the column with Li, Na, K... is group 1), and a period is a horizontal row (e.g., the row with H, He is period 1). For question…
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in a water molecule: covalent bonding (intramolecular) h-o-h cross two …
buckminsterfullerene (or C₆₀)
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within a water molecule: covalent bonding (intramolecular) h-o-h betwee…
fullerene (or C₆₀, or buckminsterfullerene)
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2. complete the following single replacement and double replacement rea…
1. $\boldsymbol{Mg + 2HCl = MgCl_2 + H_2\uparrow}$ 2. $\boldsymbol{Na + AgNO_3 = NaNO_3 + Ag}$ (Note: In an aqueous environment, the reaction is more complex due to Na's reaction …
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section a: multiple choice (choose the best answer) 1. which career pat…
a. Coefficients: \( 1, 1, 2, 1 \); Reaction type: Double Replacement b. Coefficients: \( 1, 2, 1, 1 \); Reaction type: Single Replacement c. Coefficients: \( 2, 2, 3 \); Reaction …
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e) copper reacts with oxygen to form a green compound f) ability to bur…
e) Chemical f) Chemical g) Physical h) Physical i) Chemical j) Chemical k) Physical l) Physical m) Physical n) Physical o) Physical 7. a. Aluminum: Element a. NaCl: Compound b. CO…
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e) copper reacts with oxygen to form a green compound f) ability to bur…
a. Aluminum: element a. NaCl: compound b. CO₂: compound c. Cu: element
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date 17 - 11 - 25 class period 6th chemistry fall semester final exam r…
a. The # of Protons ### Question 2 (Table Completion)
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9/50 which of the following is a covalent bonding? nacl libr ch₄
\(CH_4\)
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3. complete the following chart about ionic and covalent compounds chem…
s: ### Question 4 b. Formula: \( \text{CaS} \), Ratio: \( 1:1 \) c. Formula: \( \text{AlF}_3 \), Ratio: \( 1:3 \) ### Question 5 1: mono, 2: di, 3: tri, 4: tetra, 5: penta, 6: hex…
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how do barrier devices differ from hormonal methods for contraception? …
Barrier devices block sperm from reaching an egg, while hormonal methods prevent ovulation.
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annotation requires the following 1. number paragraphs 2. write a summa…
Natural Science - Chemistry
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reaction stoichiometry involving gases 79. consider the chemical reacti…
Approximately 54.0 liters.
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15 list the most common pioneer species and what they do to the environ…
- Lichens: Break down rock to form soil, start nutrient cycling. - Mosses: Retain moisture, add organic matter to soil. - Algae (e.g., cyanobacteria): Provide nutrients, stabilize…
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prolonged exposure to carbon monoxide can be deadly. true false
TRUE
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partial pressure 67. a gas mixture contains each of the following gases…
Total pressure: $\boldsymbol{426}$ torr Mass of $N_2$: $\boldsymbol{\approx0.259}$ g Mass of $O_2$: $\boldsymbol{\approx0.568}$ g Mass of $He$: $\boldsymbol{\approx0.0340}$ g
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13. what is the octet rule? 14. an__________is a particle with a charge…
The octet rule states that atoms tend to gain, lose, or share electrons to achieve a stable electron configuration with 8 valence electrons (to mimic the electron configuration of…
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periodic trends atomic radius decrease ionization e increases electrone…
a. Atomic radius across a period: decreases; down a group: increases b. Ionization energy across a period: increases; down a group: decreases c. Electronegativity across a period:…
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1. fill in the blanks in the data table below regarding the periodic ta…
The filled table (key parts) is as above. For each group: - 1A: Electron config ends in \( ns^1 \), Valence e⁻ = 1 - 2A: Electron config ends in \( ns^2 \), Valence e⁻ = 2 - 3A: G…
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Question was provided via image upload.
4. Fluorine (F) 5. Group 1A (Alkali metals)
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an the data table below regarding the periodic table of the elements. 4…
5. Group 1A (Alkali metals) 6. Group 7A (Halogens) 7. Group 8A (Noble gases); Because they have a full valence electron shell (8 electrons, or 2 for He), so they do not easily gai…
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11. do you think dissolving salt in water is a chemical change or a phy…
Dissolving salt in water is a **physical change** because no new substance is formed (the salt ions remain chemically unchanged, and the salt can be recovered by evaporating the w…
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11. write the formula for magnesium selenide. 12. write the formula for…
$\boldsymbol{MgSe}$ ### Question 12:
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10. ice is often a different color than water and is not transparent. t…
The statement is false. Freezing is a physical change, not a chemical change. In freezing, water (liquid) becomes ice (solid), but the substance remains H₂O (no new substance is f…
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which of the following statements about physical and chemical changes i…
All of the above statements are true
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which type of energy is associated with position? chemical potential el…
B. potential
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if a particular process is endothermic, the reverse process must be a (…
B. exothermic process.
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an energy diagram that shows the reactants having greater energy than t…
D. exothermic reaction (assuming the options are labeled A to E with D as exothermic; if the original options are ordered as given, the correct one is the fourth option: "exotherm…
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part a which statement below accurately describes the contributions of …
B. proposed the modern Atomic Theory
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an atom containing 7 protons, 8 neutrons, and 7 electrons: - cannot exi…
B. is charge - neutral.
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which of the following elements has only 12 protons? zn o c mg none of …
D. Mg (assuming the options are labeled A: Zn, B: O, C: C, D: Mg, E: none of the above; if labels differ, adjust to the correct label with "Mg" as the option text)
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the names of the elements whose symbols are si, p, mn, and s are respec…
B. silicon, phosphorus, manganese, and sulfur.
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which one of the following is a main-group element? cs ce co cu none of…
A. Cs
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metalloids are located where on the periodic table? left side right sid…
The correct option is the one with "zig - zag diagonal line" (the fourth option in the list: $\boldsymbol{\circ}$ zig - zag diagonal line)
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a sodium hydroxide solution contains $6.9 \\times 10^{-5}$ kg of sodium…
B. between 100 and 300
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2. all forms of light spread out or ______ in ___ directions. this type…
It would cost \(\$0.05\) to leave the \(100\,\text{W}\) light bulb on for 5 hours.
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what ground state to excited state combination gives sp hybridization w…
c to d
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a matchstick is burning. the best summary of the energy transformation …
A. Chemical -- Thermal -- Light
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what energy transformation causes the blades of an electric fan to move…
A. Electrical → Mechanical
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what energy transformation is occurring in the diagram below? electrica…
B. Chemical to Electrical to Electromagnetic (EM)
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what would be the energy transformation occurring from the sun heating …
C. Nuclear → EM → Thermal (assuming the third option is labeled as C, with text "Nuclear → EM → Thermal")
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a solar panel converts --------------------------- energy into --------…
A. Electromagnetic → Electrical
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a toaster converts ______ to ______ energy. mechanical - em chemical - …
Electrical → Thermal
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read a text about fireworks. fireworks operators usually fall into one …
- Some people like loud fireworks: Checked (or the box next to this detail is selected) - Stunning visual effects are possible with fireworks: Checked (or the box next to this det…
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balancing equations: - balance the equation! ____ mg + ____ h₂o → ____ …
Los coeficientes balanceados son: $\boldsymbol{1}\text{Mg} + \boldsymbol{1}\text{H}_2\text{O} ightarrow \boldsymbol{1}\text{MgO} + \boldsymbol{1}\text{H}_2$ (corrigiendo el error …
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10. what property of water allows hydrogen bonds to form between water …
The polarity of water molecules (specifically, the presence of partial positive charges on hydrogen atoms and partial negative charges on oxygen atoms within water molecules) allo…
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in an electric motor, the energy transformation begins as mechanical an…
The option with "electrical and becomes mechanical" (the bottom - most blue box option)
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in an electric generator, the energy transformation begins as -- mechan…
mechanical and becomes electrical
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generators are devices that convert ------ energy into ------ energy. c…
mechanical; electrical
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34. each week, over 100,000 people manage to hurt themselves (or someon…
True (the option with the label "True")
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28. if a fire occurs inside of your microwave, you should simply shut t…
D. oxygen
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was cooking burgers on his stove when a fire broke out. he knew to cove…
B. grease fire (assuming the option with "grease fire" is labeled as B; adjust the label as per the actual question's option numbering)
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elements that do not have complete sets of valence electrons tend to * …
C. react.
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elements that do not have complete sets of valence electrons tend to * …
C. react
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according to the textbook what is the definition of electron dot diagra…
C. a model of an atom in which each dot represents a valence electron ### Second Sub - Question (Group of the element with the given electron dot diagram)
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which group or family of elements have a stable electron configuration?…
D. noble gases ### Second Question:
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when the highest occupied energy level of an atom is filled with electr…
C. is stable and not likely to react (assuming the third option is labeled C; if the options are unlabeled by letter, then "the option 'is stable and not likely to react'")
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a form of matter with indefinite shape and volume molecule atom thermal…
D. Gas
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what is happening to the particles in the substance between points d an…
Vaporizing
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how are molecules affected when heat is added? they vibrate slower. the…
D. They vibrate faster.
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when a substance changes from a gas into a liquid, what has happened? h…
A. Heat has been removed
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a state of matter with a definite volume but no definite shape; options…
4. Liquid
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which numerical setup can be used to calculate the formula mass of c₉h₁…
4. \( 9(12\ \text{u}) + 11(1\ \text{u}) + 1(14\ \text{u}) + 2(16\ \text{u}) \)
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which phrase describes a sample of nacl(s)? 1. a mixture that has const…
3. a substance that has constant composition and properties throughout
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given the balanced equation representing a reaction: c₂h₅oh(ℓ) + 3o₂(g)…
3. 3:2
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how do the molecular structures and properties of oxygen, o₂, and ozone…
2. They have different molecular structures and different properties.
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what is a chemical name for $kclo_2$? 1. potassium chlorate 2. potassiu…
2. potassium chlorite
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what is the percent by mass of oxygen in ch₃cooh (gram - formula mass =…
3. 53%
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name: james wheat hour: 1 2 3 4 5 the ideal gas law use the ideal gas l…
\( \approx204.6\ \text{K} \) ### Problem 2:
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2 multiple choice 10 points the video suggest an effective organization…
D. Have a file folder for each year, then inside it have a folder for each class, then inside each class - store all of the files you make for that class ### Question 3
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question 22 which element is represented by the electron configuration …
C) C ### Question 23
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part f summarize your findings, and compare the odor, flammability, den…
The problem is related to the subfield of Chemistry (Natural Science). To solve it: 1. **Composition of Fractions**: If the properties (odor, flammability, density, sugar solubili…
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12. chemical properties refer to how a substance interacts or undergoes…
chemical ### Question 13
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7. when two or more atoms come together and ______________ electrons th…
share; covalent ### Question 8
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information you need to know for your 1st semester science exam 1. iden…
### Question 1 A - Atomic Number (28) B - Element Symbol (Ni) C - Element Name (Nickel) D - Atomic Mass (58.71) ### Question 2 Part of element box to identify element: Element Sym…
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ionic bonds form between __a metal ______ and __nonmetal.________. in n…
- Ionic bonds form between $\boldsymbol{\text{a metal}}$ and $\boldsymbol{\text{a nonmetal}}$. - In naming simple ionic compounds, the $\boldsymbol{\text{metal (cation)}}$ is alwa…
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14. list 3 reasons why earth is capable of supporting life.
1. Earth is in the Sun’s habitable zone, maintaining temperatures suitable for liquid water. 2. Earth has abundant liquid water, critical for life’s biochemical processes. 3. Eart…
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snowball had made a close study of some back numbers of the \farmer and…
B. Napoleon does not listen to Snowball’s ideas. C. Napoleon does not make any plans of his own. D. Napoleon says that the improvements will never happen. E. Napoleon seems to be …
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5) identify each change below as physical or chemical. then list the ev…
| Change | Chemical or Physical? | Evidence | | --- | --- | --- | | Cutting your hair | Physical | No new substance, only shape/length of hair changes | | Mixing sugar and water |…
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match the vocabulary term with its definition thermal equilibrium kinet…
- Thermal Equilibrium: When temperature is equal and energy flow stops - Kinetic Energy: energy of motion - Potential Energy: energy stored in the position/molecules of an object …
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acetaminophen (tylenol): c, 63.56%, h, 6.00%, n, 9.27%, and o, 21.17% e…
Part A: $C_8H_9NO_2$ Part B: $C_{14}H_{14}O_3$
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what is the chemical formula for this molecule? complete the formula be…
$\ce{H_{2}O_{1}}$ (or simply $\ce{H_{2}O}$ as the subscript 1 for O is often omitted)
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a student measured the temperatures (in degrees celsius) of two differe…
(a) Mixture A: \(3\), Mixture B: \(1\) (b) Mixture B
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which type of mixture has varying sizes of particles that are large eno…
c. colloid
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which of these mixtures has the smallest particles? a colloid b compoun…
c. solution
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which is an example of a colloid? a salad dressing b sugar and water c …
d. homogenized milk
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which is an example of a homogeneous mixture that is a solution? a sala…
b. salt water