Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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kinetic energy is a type of ○ mechanical energy ○ chemical energy ○ pos…
A. mechanical energy ### Question 2 (The Law of Conservation of Energy states that)
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select the correct answer. which compound is inorganic? a. $c_6h_{12}o_…
B. $\text{KH}_2\text{PO}_4$
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what three properties does a work of art contain? composition, form, an…
subject, composition, and content (the fourth option) ### Question 2:
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debbies chemistry textbook weighs 7/10 of a pound and her geometry text…
$\frac{1}{5}$ pounds
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name class date solubility curve classify the following solutions as to…
To solve this, we analyze each solution by comparing the amount of solute to the solubility (from the curve) at the given temperature. A solution is: - **Unsaturated**: Solute < S…
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name class date classify each of the following as soluble (aq) or insol…
** aq ### 2. $\boldsymbol{Ba(OH)_2}$ Hydroxides: $\text{Ba}^{2+}$ hydroxides are soluble (exception to most hydroxides being insoluble).
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decide which element probably forms a compound with oxygen that has a c…
- Most similar to beryllium: B. barium - Least similar to beryllium: D. phosphorus
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3 multiple choice 1 point methamphetamine can also be taken orally as a…
A. The time it takes methamphetamine to reach the systemic circulation is much shorter than if administered intravenously
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1 multiple choice 1 point when determining the bioavailability of a dru…
6. large; portal circulation; low ### Question 2 (Multiple Answer)
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fill in the information missing from this table. | nuclide | protons | …
# Explanation: ## Step1: Recall definitions (Z=protons, A=protons+neutrons, nuclide symbol: element with Z, A) For a nuclide, \( Z \) (atomic number) = number of protons. \( A \) …
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how many protons and neutrons are in an atom of rh-103 number of proton…
Number of protons = 45 Number of neutrons = 58
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how many protons are in a neutral atom of radon (rn)? how many electron…
Number of protons = 86 Number of electrons = 86
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ethanol, fermentation, depressant, intoxication, alcohol abuse, metabol…
depressant ### Second blank:
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directions: use a periodic table to find the information asked for belo…
### Question 1: Atomic Number #### Step 1: Recall the atomic number (number of protons) from the periodic table. - Calcium (Ca): Atomic number is 20. - Iron (Fe): Atomic number is…
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a chemist needs to know the mass of a sample of aniline to 2 significan…
\( 13 \)
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a chemistry student needs 20.0 g of methyl acetate for an experiment. b…
21.4
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complete the table below. round your answers to the nearest degree. tem…
For the freezing point of grain alcohol: $\boxed{159}$ K For the melting point of gallium metal: $\boxed{303}$ K For the melting point of iron: $\boxed{1811}$ K
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#3 - balance this chemical equation on your own ____ naclo₃ → ____ nacl…
$2\text{NaClO}_3 ightarrow 2\text{NaCl} + 3\text{O}_2$ (The coefficients are 2, 2, 3 respectively)
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#4 - balance this chemical equation on your own ____ kno₃ + ____ h₂co₃ …
$2\text{KNO}_3 + \text{H}_2\text{CO}_3 ightarrow \text{K}_2\text{CO}_3 + 2\text{HNO}_3$ (The coefficients are 2, 1, 1, 2 respectively)
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#2 balance this chemical equation on your own ___ rb + ___ o₂ → ___ rb₂o
$4\text{Rb} + 1\text{O}_2 ightarrow 2\text{Rb}_2\text{O}$ (The coefficients are 4, 1, 2 respectively)
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how is the rhythm similar in both poems? your answer submit never submi…
To determine rhythmic similarity between two poems, analyze elements like **meter** (e.g., iambic pentameter, trochaic beats), **rhyme scheme** (e.g., ABAB, free verse with rhythm…
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directions: use your periodic table to complete the worksheet. 1. what …
Ag ### Question 2
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question 1 5 pts joe is a chemical engineer whose plant discharges heav…
B. The issue is whether present emissions should be considered a "violation" of city regulations
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fill in the information missing from this table. nuclide | protons | ne…
# Explanation: ## Step1: Recall definitions - \( Z \) (atomic number) = number of protons. - \( A \) (mass number) = number of protons + number of neutrons. - Nuclide symbol: \( _…
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an endothermic reaction is where heat is ________. taken in (absorbed) …
A. taken in (absorbed)
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an exothermic reaction is where heat is _____. released taken in (absor…
released (the checkbox next to "released" should be selected)
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burning of a candle is an example of an ____ reaction. □ exothermic □ e…
A. exothermic
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question 3 3. multiple choice: which piece of evidence best illustrates…
D. "I tried to comfort her, but she barely spoke." (Paragraph 24)
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fill in the missing information: | symbol | atom or ion? check all that…
| symbol | atom or ion? (check all that apply) | number of protons | number of electrons | |--------|--------------------------------------|-------------------|-------------------…
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how many protons and neutrons are in an atom of kr-80? number of proton…
Number of protons = 36 Number of neutrons = 44
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write the chemical symbol for an element in period 3 and group 7a.
Cl
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which substances have the same number of carbon atoms? select all corre…
Las sustancias con el mismo número de átomos de carbono son $\boldsymbol{\ce{CH3CH2Br}}$ (o $\ce{C2H5Br}$) y $\boldsymbol{\ce{C2H6O}}$, ya que ambas tienen 2 átomos de carbono. Ad…
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what is the law of conservation of mass? mass is never created or destr…
El rectángulo cian: Mass is never created or destroyed
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how many atoms of aluminum are on each side of the following equation. …
4
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i. co(no₃)₂ ii. (nh₄)₂co₃ iii. (nh₄)₃po₄ iv. al(no₃)₃ v. nh₄no₃ which o…
formulas I, II, and V
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a class reads two claims about a candle burning in a sealed container: …
D. Claim X states a law (what happens); Claim Y provides a theoretical explanation (why it happens).
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? g → 28.00g + 21.97g what is the missing mass? 49.97 28.00 50 21.97
49.97
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multiply or divide the following measurements. be sure each answer you …
### First Calculation: \( 611.0 \, \text{m} \div 53.00 \, \text{s} \) # Explanation: ## Step1: Perform the division \( 611.0 \div 53.00 = \frac{611.0}{53.00} \approx 11.5283 \) ##…
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a chemistry student needs 70.0 g of glycerol for an experiment. by cons…
$55.6$
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take the following quiz to check your understanding of functional group…
To solve this, we analyze each molecule's properties: ### 1. Glucose Glucose has multiple hydroxyl (-OH) groups, creating a polar structure due to electronegativity differences (O…
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complete the following lewis dots. atoms\tions lithium li\tcalcium ca·²…
### Corrected Atoms & Ions: 1. Cesium: $\cdot \text{Cs}$ 2. Strontium ion: $[\text{Sr}]^{2+}$ ### Corrected Compounds: 1. $\text{NaCl}$: $[\text{Na}]^+ [:\ddot{\text{Cl}}:]^-$ 2. …
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question 1 0.34 pts what is meant by the term strata when describing se…
Question 1: Strata are layers composed of the same type of sedimentary rock in a thickness that is typically measured in tens of meters or more. Question 2: A specific mineral typ…
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57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 la ce pr nd pm sm eu gd tb…
Diatomic Element: hydrogen, iodine, oxygen Monatomic Element: helium, carbon, sodium
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drag each tile to the correct location. classify the elements as diatom…
To solve this, we first recall the definitions: - **Monatomic elements**: Exist as single atoms (most elements, like metals, noble gases, some nonmetals). - **Diatomic elements**:…
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le chateliers principle continued 12.6 kcal + h₂(g) + i₂(g) ⇌ 2hi(g) | …
### First Equilibrium: \( \boldsymbol{12.6 \text{ kcal} + H_2(g) + I_2(g) ightleftharpoons 2HI(g)} \) #### Stress 1: Add \( H_2 \) - **Equilibrium Shift**: Right (given). - **\( […
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4. determine the empirical formula of the indicated compound. (4 points…
A. $\text{P}_2\text{S}_5$ B. $\text{CF}_3$
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Question was provided via image upload.
The empirical formula is $\text{P}_2\text{S}_5$
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ami day: formulas for acids name construct the chemical formula for eac…
1. $\text{H}_2\text{Cr}_2\text{O}_7$ 2. $\text{HCl}$ 3. $\text{HF}$ 4. $\text{HClO}_2$ 5. $\text{H}_3\text{AsO}_4$ 6. $\text{H}_3\text{P}$ 7. $\text{HCN}$ 8. $\text{HIO}_3$ 9. $\t…
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what number do you use to convert moles to liters? moles to atoms? mole…
- Moles to liters (at STP): Use 22.4 L/mol (conversion factor: Volume = Moles × 22.4 L/mol). - Moles to atoms: Use Avogadro's number (\( 6.022\times 10^{23} \) atoms/mol) (convers…
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ami day: nomenclature for acids name correctly name the following acids…
1. Hydrosulfuric acid 2. Chromic acid 3. Hydrofluoric acid 4. Tetraboric acid 5. Hydrophosphoric acid 6. Iodic acid 7. Hydrocyanic acid 8. Perchloric acid 9. Hydroselenic acid 10.…
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each case, he fills a reaction vessel with some mixture of the reactant…
### First Reaction: $\boldsymbol{\ce{CO2(g) + 2H2O(g) -> CH4(g) + 2O2(g)}}$ #### Step 1: Convert temperature to Kelvin The temperature is $74.0^\circ \text{C}$. To convert to Kelv…
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16. an imaginary element named summerium forms the following imaginary …
### Question 16 1. Monatomic ion 2. $\text{H}_2\text{Su}$ 3. Binary acid 4. Hydrosummeric acid ### Question 17 1. Polyatomic ion 2. $\text{H}_3\text{WnO}_4$ 3. Oxyacid 4. Winteric…
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select the correct answer. when a perfume bottle is opened, some liquid…
A. Gases do not have a definite volume.
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4. drew added yeast and sugar to lukewarm water and placed it in a flas…
The mass should be the same since matter is neither created nor destroyed.
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3 an equation for photosynthesis is shown. \\boxed{\\ce{6co_{2} + 6h_{2…
The incorrect statement is "The number of oxygen atoms in the reactants equals the number in the products" (the first option, as marked in the image, assuming the equation had a t…
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14. an imaginary element named studentium forms the following imaginary…
### Question 14: 1. Monatomic ion 2. $\text{H}_2\text{St}$ 3. Binary acid 4. Hydrostudentic acid ### Question 15: 1. Polyatomic ion 2. $\text{H}\text{BsO}_3$ 3. Oxyacid 4. Basketo…
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assignment: reflect on the lab active reflect on the laboratory experim…
- Ionic substances: sodium chloride, sodium bicarbonate - (For the prediction accuracy question, select the option that matches your actual warm-up performance; e.g., if you got 2…
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11. which of the following is the correct chemical formula for arsenic …
b. $\text{H}_3\text{AsO}_4$
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assignment: reflect on the lab active reflect on the laboratory experim…
- sodium chloride - sodium bicarbonate
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9. which of the following is true concerning boric acid? a. boric acid …
b. Boric acid contains hydrogen with the borate oxyanion.
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read the passage from sugar changed the world. no one could have seen i…
B. Advances in the production of sweeteners hastened the end of involuntary servitude.
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7. which of the following substances would be classified as an acid? a.…
7. a. $\text{H}_2\text{C}_4\text{H}_4\text{O}_6$ 8. c. hydrosulfuric acid, a. hydrophosphoric acid (note: option b is incomplete, but the valid binary acids from given options are…
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extra credit name: aluminum antimony argon beryllium boron calcium carb…
This is a word search puzzle related to chemical elements, so the relevant subfield in Natural Science is Chemistry. To solve the word search, we look for each element's name in t…
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calculate the percent composition by mass of zinc in the fictional comp…
\( 49.8\% \)
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calculate the percent composition by mass of calcium in the fictional c…
44.9%
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calculate the percent composition by mass of iodine in the fictional co…
$58.7\%$
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calculate the percent composition by mass of magnesium in the fictional…
\(9.22\%\) (or \(9.21\%\) - slight rounding differences, but typically \(9.22\%\) with 3 sig figs)
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calculate the percent composition by mass of yttrium in the fictional c…
65.0%
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calculate the percent composition by mass of chromium in the fictional …
\( 20.1\% \)
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calculate the percent composition by mass of oxygen in the fictional co…
49.4%
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calculate the percent composition by mass of carbon in the fictional co…
\( 69.2\% \)
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calculate the percent composition by mass of hydrogen in the fictional …
\( 5.89\% \)
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which is an example of a physical change? a candle burning a firework e…
ice cream melting
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separating sand from gravel; physical; chemical
physical
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boiling water; physical; chemical
Physical
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this picture represents which of the following? compound mixture element
mixture
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balancing equation quiz balance the following equations and identify th…
1. $\boldsymbol{1\text{Mg}_3\text{P}_2 ightarrow 3\text{Mg} + 2\text{P}}$ Type: (D) Decomposition 2. $\boldsymbol{1\text{CH}_4 + 2\text{O}_2 ightarrow 1\text{CO}_2 + 2\text{H}_2\t…
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contains two or more atoms combined; mixtures; elements; compounds
Compounds
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which of the following is an element? salt oxygen sugar water
Oxygen
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contains only one kind of atom. mixture element compund
Element
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glucose (c₆h₁₂o₆) is an example of a... mixture element compound
Compound
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classify the picture with the correct label. mixture of elements and co…
C. Mixture of Elements
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which statement best describes the gas in a scuba tank? the gas barely …
The gas is compressed.
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classify the picture with the correct label. compounds; mixture of elem…
B. Mixture of Elements & Compounds
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classify the picture with the correct label. element mixture of compoun…
Compound
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11 multiple choice 1 point ls estudios sociales social media social stu…
B. social studies ### Question 12
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which one shows that a chemical reaction has occurred? melting dissolvi…
formation of a gas
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bike rusting; physical; chemical
Chemical
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examples are diamonds (c) and uranium (u)\ mixtures\ compounds\ elements
elements
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burning leaves chemical physical
chemical
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nahco₃ is an example of — a compound an abbreviation a mixture an eleme…
a compound
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3.07 unit test: gas laws due: fri feb 6, 2026 11:59pm attempt 1 in prog…
There is a rise in temperature.
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11. at antarcticas famous blood falls, bright red water seeps out of th…
Synthesis ### Task 2:
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a bakery has developed a new artisan bread. the staff are giving away t…
- Observe customer reactions while they taste the product. - Measure sales of the new bread after customers have sampled it.
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what does the fda regulate? select all that apply. □ workplace safety □…
- drugs - tobacco products
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2. can oxidation occur without reduction? explain. 3. why would a nail …
No, oxidation cannot occur without reduction. Oxidation is the loss of electrons, and reduction is the gain of electrons. In a redox reaction, electrons lost by one species (durin…
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question 1 2 pts ------ refers to the processes of generating meaning u…
1. D. Nonverbal communication 2. B. non-vocal
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what device measures the potential difference (voltage) between two poi…
Voltmeter
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bell ringer 1. what are some factors that determine a chemical change h…
Some factors indicating a chemical change are color change, gas production, precipitate formation, energy change (heat/light), and odor change. ### 2. Factors indicating a physica…
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please select the most accurate description of the image below:
Mixture (assuming the option "Mixture" is one of the choices; if options were, e.g., A. Pure Substance, B. Water Molecules, C. Mixture, the answer would be C. Mixture)