化学
化学反応、化学量論、分子構造、元素の性質。
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the rapid movement of gases molecules can be explained because gases ha…
D. small, little
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sam is building a campfire while camping with his family. sams younger …
b. Chemical energy in the log is converted to heat and light energy.
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write the formula of this compound antimony tribromide ○ sbbr₃ ○ abr₂ ○…
A. \( \text{SbBr}_3 \) ### Chlorine Dioxide Formula Question
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question 10 0.5 pts name this compound ph₃ ○ phosphorus trihydogen ○ ph…
C. Phosphorus Trihydride ### Question 11
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the second step to naming a covalent compound is the second element is …
The second element is named as anion using the suffix ide ### Second Question (Telling Number of Atoms in Covalent Compound)
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go to the website: http://www.kentchemistry.com/links/naming/namecov.ht…
A. The first element is named first using the elements name
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match the term with its definition. polar covalent bond choose choose n…
- Polar covalent Bond: when atoms are shared unequally in a covalent bond - Nonpolar covalent bond: a type of chemical bond that is formed when electrons are shared equally betwee…
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question 5 0.5 pts which element shown is doubled bonded? oxygen nitrog…
A. Oxygen
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which element shown in the video is a single bonded element? oxygen nit…
C. Chlorine ### Second Question (Which element is triple bonded?):
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why do atoms carry out covalent bonding? they bond together because the…
The correct option is: Their outer shell is not full which cause them to be unstable. ### Question 3 (Which element shown in the video is a single bonded element? - Note: Since th…
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go to the website: video link and watch the video. use this video to an…
A. Atoms bond together to complete their outer shell.
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26. all of the following changes to a metal are physical changes except…
b. rusting ### Question 27
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practice test f2 (pg 4 of 6) solubility equilibrium, ( k_{sp} ) ( ce{ca…
c. It is higher at a lower pH; there are more \(H^+\) ions in solution at low pH, so HF forms and shifts the equilibrium reaction above to the right. ### Question 23
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20. $k_{sp}=5.5\\times10^{-6}$ $\\ce{ca(oh)_{2}}\ ightleftharpoons\\ce{…
b. Less solid will dissolve, because the larger value of $[\ce{OH^-}]$ will cause the equilibrium position to lie farther to the left. ### Question 21
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practice test f2 (pg 3 of 6) solubility equilibrium, $k_{sp}$ rxn1: $pb…
d. \( K_{eq} = K_{sp1} / (K_{sp2})^2 \) ### Question 18
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hg₂i₂ ⇌ hg₂²⁺ + 2 i⁻ ( k_{sp} = \text{hg}_2^{2+}\text{i}^-^2 ) 16. a sa…
c. \( \text{s} = 2.3 \times 10^{-10} \, \text{M}; K_{sp} = [2.3 \times 10^{-10}][4.6 \times 10^{-10}]^2 \)
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use the following information to answer the next three questions 150 ml…
b. \( [\text{Sr}^{2+}] = 1.0 \times 10^{-3}\, \text{M}, [\text{F}^-] = 2.0 \times 10^{-3}\, \text{M} \) ### Question 14
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16. quiz limiting reactant 25 grams of silver (i) phosphide is added to…
Mass of $\text{AgOH}$: $\boldsymbol{75.5\ \text{grams}}$ Mass of $\text{Cr}_3\text{P}_2$: $\boldsymbol{22.0\ \text{grams}}$ (rounded to 3 significant figures)
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to (reassure) even those southerners who have accepted the following: i…
C. logical appeal
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11. magnesium hydroxide, mg(oh)₂, has a ( k_{sp} = 6.3 \times 10^{-10} …
b. 0.10 M NaOH ### Question 12
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10. on the basis of the solubilities (in mol/l) listed below, what is t…
d. \( \text{AgSCN} > \text{AgBr} > \text{AgCN} \)
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practice test f2 (pg 2 of 6) solubility equilibrium, $k_{sp}$ 9. on the…
b. \( \text{AgBr} < \text{AgCl} < \text{Ag}_2\text{CO}_3 \)
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8. the solubility of metal(ii) sulfide, $k_{sp}=1.6 \\times 10^{-11}$, …
a. \( 4.0 \times 10^{-6} \)
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7. equal volumes of $1.6 \\times 10^{-5} m kcl$ and $1.6 \\times 10^{-5…
b. there is no precipitate formed.
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6. the solubility of silver sulfide is $8.0 \\times 10^{-17} m$. determ…
c. $[16.0\times 10^{-17}]^2 [8.0\times 10^{-17}]$
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5. determine the solubility of lead(ii) fluoride, ( k_{sp} = 4.0 \times…
a. \(2.0 \times 10^{-3}\ M\)
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4. what is the molar solubility in water of pbi₂? (the ( k_{sp} ) for (…
e. $2 \times 10^{-3}\ \text{M}$
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question 16 (multiple choice worth 4 points) a committee is working on …
D. Determining a specific percentage target of residents for increasing recycling
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which of the following molecules is not formed by covalent bonding 1 po…
C. \( \text{NaCl} \)
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3. $\\ce{h_{2}so_{4} + 2 naoh \ ightarrow 2 h_{2}o + na_{2}so_{4}}$ how…
Approximately \( \boldsymbol{17.3} \) moles (or more precisely ~17.27 mol) of \( NaOH \) are needed.
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color combinations use the color wheel to help you determine the differ…
## Secondary colors (pre-filled, confirmed): Orange, Purple, Green ## Intermediate colors: Red-Orange, Yellow-Orange, Yellow-Green, Blue-Green, Blue-Violet, Red-Violet ## Compleme…
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elements, compounds, and mixtures classify each of the pictures by matc…
To solve this, we analyze each diagram based on the definitions: ### 1. First Diagram (Top - Left) - All molecules are the same (two types of atoms bonded, so a compound). And the…
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nomenclature worksheet 3 - covalent (molecular) compounds part a: name …
1. CO: Carbon Monoxide 2. CO₂: Carbon Dioxide 3. N₂O₃: Dinitrogen Trioxide 4. N₂: Dinitrogen 5. NP: Nitrogen Monophosphide 6. SCl₂: Sulfur Dichloride 7. P₂O₅: Diphosphorus Pentoxi…
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horizons the o horizon contains leaf litter and other decaying organic …
1 ### 2. Transition/C horizon location
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calculate the number of grams contained in 3.20 moles of rubidium dichr…
\( 1240 \, grams \) (or \( 1.24 \times 10^3 \, g \))
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question 24 (24) which method is used for testing impairment? a. police…
Question 24: B. Chemical test Question 25: D. Has reasonable suspicion that you are driving under the influence.
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13. what is the oxidation number of carbon in c₂h₆? a. -4 b. -3 c. -2 d…
B. -3 ### Question 14
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question 22 4 pts (22) if a driver refuses to summit to a chemical test…
Question 22: B. 1 year Question 23: A. Depressant
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9. what is the oxidation number of iron in fe₃o₄ (average value)? a. +2…
C. +2.67 ### Question 10
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(10) any driver under 21 is considered to be \driving while impaired\ i…
(10) B. .01 (11) B. Try to stop him/her
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how many moles are in 78.9 grams of fes? include the unit with the answ…
$0.90\ mol$ (or $0.897\ mol$, depending on precision)
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question #4- use the balanced equation to answer the following question…
Question #4: 11.3 moles Question #5: 1.5 moles
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how many moles are contained in 9.54 × 10²³ atoms of platinum? include …
1.58 moles
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question #2- use the balanced equation to answer the following question…
Question #2: 4 moles Al : 2 moles $\text{Al}_2\text{O}_3$ Question #3: 1 mole
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question 3 not yet answered marked out of 1 flag question how many mole…
\( 0.144 \) moles
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22. complete the following table. characteristic: | ionic compounds | c…
To complete the table, we analyze the properties of ionic and covalent compounds: ### Step 1: Melting Point - **Ionic Compounds**: Have high melting points (strong ionic bonds req…
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question #1 - use the balanced equation to answer the following questio…
○ 2
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question 3 not yet answered marked out of 1 flag question how many mole…
\( 0.144 \) moles
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5. in the reaction below: fe + cuso₄ → feso₄ + cu which substance is ox…
A. Fe ### Question 6
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while researching a topic, a student has taken the following notes: mos…
C. Cosmochemist Kentaro Terada set out to determine whether some of the Moon’s oxygen was coming from Earth.
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advanced redox reactions quiz – honors / pre-ap chemistry (15 questions…
B. Loss of electrons ### Question 2
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snc 2d assignment: ionic and covalent compounds 11. for each of the fol…
To solve this, we analyze each compound to determine if it's ionic (formed between metal/ammonium and non - metal/polyatomic ion) or covalent (formed between non - metals) and the…
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19. using your electronegativity chart, calculate the electronegativity…
To solve this, we use electronegativity values (from a standard chart: H=2.1, Cl=3.0, C=2.5, S=2.5, K=0.8, I=2.5, Se=2.4, F=4.0, Mg=1.2, Br=2.8, S=2.5). The formula for electroneg…
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18. write formulas for the following ionic and molecular compounds: a. …
a. $H_2O$ b. $Al_2S_3$ c. $NaOH$ d. $IBr_3$ e. $As_2Cl_5$ f. $CO$ g. $CuCl_2$ h. $C_2F_6$ i. $SiCl_4$ j. $CaSO_4$
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17. name the following ionic and molecular compounds: a. n₂o₅ b. k₂so₄ …
s: a. Dinitrogen pentoxide b. Potassium sulfate c. Nitrogen monoxide d. Dinitrogen tetroxide e. Sodium chloride f. Ammonia (Nitrogen trihydride) g. Magnesium oxide h. Ammonium hyd…
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plain the terms electron domain, bonding domain, and nonbonding domain.
- **Electron Domain**: A region around a central atom in a molecule with concentrated electrons (bonding/non - bonding). - **Bonding Domain**: Electron domain with pairs in chemic…
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16. draw the following molecular shapes and describe their electron dom…
### Linear: - **Electron Domains**: 2 bonding, 0 non - bonding. - **Drawing**: Central atom with two bonds at 180°. ### Bent: - **Electron Domains**: 2 bonding, 1 - 2 non - bondin…
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practice h₃po₄ h=3 p=4 o=4 pcl₅ p=1 cl=5 c₂h₆o c=2 h=6 o= na₃po₄ na=3 p…
To solve for the number of oxygen atoms in each compound, we use the subscripts and coefficients (if present) to calculate the total number of O atoms. Let's go through a few exam…
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2 points h₃po₄ + koh → k₃po₄ + h₂o k + b₂o₃ → k₂o + b c + s₈ → cs₂ na +…
To solve these chemical equations, we need to balance them by ensuring the number of each type of atom is the same on both sides of the arrow. Let's take one equation as an exampl…
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1. $3 f_{2(g)} + 2 alcl_{3(aq)} \ ightarrow 2 alf_{3(aq)} + 3 cl_{2(g)}…
Approximately \( 2.5 \) moles (or \( \boldsymbol{\frac{1.5 \times 10^{24}}{6.022 \times 10^{23}} \approx 2.5} \) mol) ### Problem 2
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12. draw lewis structures for the following: magnesium phosphide alumin…
To solve this, we determine the chemical formulas by balancing the charges of the ions. ### Magnesium phosphide - Magnesium ion: \( \text{Mg}^{2+} \) - Phosphide ion: \( \text{P}^…
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14. write the molecular formulas of the molecules magnesium chloride po…
To solve this, we determine the chemical formula for each compound by balancing the charges of ions (for ionic compounds) or using prefixes (for covalent compounds) to indicate th…
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which best describes the structure of the poem \safari day in kenya\? f…
free verse with varied line lengths
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i am a halogen. i am a gas at room temperature. and of those halogens t…
Chlorine (Cl)
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i am a main group or representative element. i am located the second pe…
B. Boron (B)
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analyze and extend part a did the result match your predictions about t…
If the prediction was that blowing into water would lower its pH (increase acidity) because exhaled \( \text{CO}_2 \) forms carbonic acid, and the measured pH decreased, then the …
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i am definitely not a halogen. but if all you knew about me was my atom…
Tellurium (Te)
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i am the least massive of all the alkaline earth metals. who am i? view…
Beryllium (Be)
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i am a group 15 element. i am a gas at room temperature. and i am most …
Nitrogen (N)
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of all the group 13 metals, i am the one with the least mass who am i? …
Boron (B)
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i am the only non - metal in group 14. who am i? view periodic table ta…
B. Carbon (C)
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of all the group 13 metals, i am the one with the least mass who am i? …
B. Boron (B)
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of all the group 13 metals, i am the one with the least mass. who am i?…
B. Aluminum (Al)
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3) \\((\\text{nh}_4)_3\\text{po}_4\\) | element | \\(\\#\\) of atoms | …
The number of atoms for N is 3, H is 12, P is 1, O is 4, and total is 20 (as shown in the table above).
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i am the only non - metal in group 14. who am i? view periodic table ta…
B. Carbon (C)
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5) al(oh)₃ element | # of atoms total |
| Element | # of Atoms | |---------|------------| | Al | 1 | | O | 3 | | H | 3 | | Total | 7 |
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of all the group 13 metals, i am the one with the least mass. who am i?…
Boron (B)
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i am the only non - metal in group 14. who am i? view periodic table ta…
Carbon (C)
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of all the group 13 metals, i am the one with the least mass. who am i?…
Boron (B)
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i am the only non - metal in group 14. who am i? view periodic table ta…
Carbon (C)
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i am the halogen located in the second period of the periodic table. wh…
Fluorine (F)
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of all the group 13 metals, i am the one with the least mass. who am i?…
A. Boron (B)
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two different cars, the model s and model t, use different substances i…
The Model T's substance changed phase because the attraction of the molecules was able to overcome their slower movement. Its molecules now move in place.
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when a substance is melting energy is? added taken away
A. Added
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what do we call the way molecules in a substance move around relative t…
○ freedom of movement
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i am the only non - metal in group 14. who am i? view periodic table ta…
Carbon (C)
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when an object freezes, what happens to the energy? ○ it gains energy ○…
It looses energy
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i am a main group or representative element. i am located in the second…
Boron (B)
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i am the least massive metalloid of period 5. who am i? view periodic t…
Antimony (Sb)
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forces shaping earth’s surface – true/false 1. weathering is the proces…
1. A. True 2. A. True 3. A. True 4. B. False 5. A. True 6. A. True 7. A. True 8. B. False 9. A. True
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i am the transition metal that has five more protons than the halogen f…
Titanium (Ti)
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1. choose the sentence in which capital letters are used correctly. (a)…
A. This afternoon, you and I will play basketball with Kathleen and Beth. ### Question 2
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use the periodic table to select the element that best fits each of the…
gold (assuming the dropdown options for the "least reactive" question include gold; if the options were, for example, noble gases like neon, argon etc., but from the given third q…
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the half - life of a radioactive kind of americium is 7,380 years. how …
23540
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use the periodic table to select the element that best fits each of the…
A. chromium, D. calcium, E. osmium
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read the claim below. people should eat more fermented foods. select th…
Fermented foods contain helpful organisms that our bodies need to function normally.
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i am the least massive of all the alkaline earth metals. who am i? view…
Beryllium (Be)
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of all the group 13 metals, i am the one with the least mass. who am i?…
Boron (B)
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i am an alkali metal located in the second period of the periodic table…
Lithium (Li)
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part b nomenclature 9. for each of the following molecular compounds, w…
To solve the nomenclature of these molecular compounds, we follow the rules for naming molecular (covalent) compounds: use prefixes (mono-, di-, tri-, tetra-, etc.) to indicate th…