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 the following are ways to reduce pollution and its negative ef…
- eating locally grown foods - walking instead of driving - making fewer purchases
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two key reactants of cellular respiration, glucose and oxygen gas, are …
| Type of atom | Glucose | Oxygen | |----------------|---------|--------| | hydrogen (H) | ✅ | ❌ | | carbon (C) | ✅ | ❌ | | oxygen (O) | ✅ | ✅ |
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5. complete the table to show the potential negative affects of troposp…
| Effect | Details | |--------|---------| | Oxidizing | Strong oxidizer that breaks down organic/inorganic compounds by stealing electrons, altering chemical structure and functio…
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a solution consists of two parts: a solvent and a solute. what is the s…
B. the substance in which the solute dissolves (assuming the options are labeled A, B, C with A being "the energy that holds the solution together", B being "the substance in whic…
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in a solution, what is a solute? the substance that dissolves. the subs…
The substance that dissolves.
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what is a solution? a mixture where two fluids separate from one anothe…
C. A mixture where one substance dissolves evenly into another. (Note: Assuming the third option is labeled C; if the original labels were different, adjust the identifier. Here, …
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reactivity quick check which element would have the lowest electronegat…
an element with a small number of valence electrons and a large atomic radius
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which statement best describes elastic potential energy? * 2 points ene…
1. For Elastic Potential Energy: When something is stretched or compressed within the object (for example, stretching a string of a compound bow). 2. For Chemical Potential Energy…
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1. outline how photochemical reactions can form secondary pollutants. 2…
1. Secondary pollutants form when primary pollutants (e.g., NOₓ, VOCs) undergo sunlight-driven photochemical reactions in the atmosphere, producing new toxic compounds like ozone …
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which statement best describes potential energy? * energy of motion ene…
1. Energy stored in an object because of its position. 2. When objects have the potential to change their position due to the force of gravity.
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which statement best describes the arrangement of electrons in an atom …
B. There are two electrons in the first energy level and seven electrons in the second energy level.
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which element has atoms with valence electrons in a higher energy level…
cesium (Cs)
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helium is in group 18 of the periodic table. how is helium different fr…
A. Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.
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two representative elements, nitrogen and oxygen, are in the same perio…
B. They have valence electrons in the same energy level.
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5. match the types of devices with the functions. ______ used by power …
### Question 5 (Matching devices with functions) To solve this, we recall the functions of environmental and pollution - control devices: 1. **Device for power plant pollutant rem…
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the mole can be used as a conversion from the atomic to the macroscopic…
158.17
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used by power plants to remove some pollutants from factory smokestacks…
To solve this matching problem, we need to recall the relevant environmental science and pollution - related terms: ### 1. For the first set of blanks (devices/technologies): - **…
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the mole can be used as a conversion from the atomic to the macroscopic…
290.88
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the mole can be used as a conversion from the atomic to the macroscopic…
85.12
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the mole can be used as a conversion from the atomic to the macroscopic…
165.37
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the mole can be used as a conversion from the atomic to the macroscopic…
129.83
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directions: solve each problem, showing all work including units1. dich…
Approximately 37.0 moles (or 36.96 moles) of $\ce{Cl_{2}}$ are needed. ### Problem 2:
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which of the following is an example of chemical weathering that breaks…
B. acid rain that begins to dissolve limestone
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question 3. which process in the rock cycle does this diagram best repr…
D. formation of igneous rock
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question 2. a piece of granite is exposed to sharp objects and pollutio…
C. The pressure could cause the granite flakes to stick together, helping to create new sedimentary rock.
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to 225 ml of a 0.80m solution of ki, a student adds enough water to mak…
0.18M
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in a concentrated solution there is ______. a large amount of solute a …
a large amount of solute
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which of the following occurs as temperature increases? ○ solubility in…
A. Solubility increases.
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which of the following usually makes a substance dissolve faster in a s…
A. stirring the solution
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solutions vocab matching solute choose solvent choose a solution that c…
a substance being dissolved in the formation of a solution ### Solvent
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show work with proper units and sig digs when you answer the following:…
$560$ calories of heat are lost (or $-560\ \text{cal}$)
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show work with proper units and sig digs when you answer the following:…
$0.0858\ \frac{\text{cal}}{\text{g} \cdot ^\circ\text{C}}$
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balancing equations ws #4 name: block: balance and identify the followi…
2, 2, 3 ### Problem 2: $\boldsymbol{\ce{AlBr3 + K2SO4 -> KBr + Al2(SO4)3}}$
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which substance would be considered a solute and which would be conside…
Sugar is the solute and Water is the solvent.
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equations ws #2 name blk cao₂ → cao + o₂ h₂ + cl₂ → hcl ag₂o → ag + o₂ …
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. Here are the balanced equations for …
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which of the following are reactants in this equation? select all that …
First question (select all that apply): - copper (II) sulfate - zinc Second question: 3CuCl₂(aq) + 2Al(s) → 2AlCl₃(aq) + 3Cu(s)
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which of the following are considered inexhaustible energy resources si…
B. sun, C. wind, D. geothermal, E. water ### Second Question (Energy from Burning Organic Matter)
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4. identify each of the following properties as either chemical (c) or …
## Question 4 (Property Classification): A. Viscosity: P B. Reactivity: C C. Malleability: P D. Luster: P E. Freezing point: P F. Flammability: C G. Density: P H. Corrosive: C I. …
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part one: 1. mass of beaker 2. mass of magnesium strip 3. volume of 1m …
\( 1.5 \, \text{g} \) (or \( 1.50 \, \text{g} \) depending on significant figures) ### 2. Calculate the mass of chlorine in the magnesium chloride.
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1. classify each of the substances as being soluble or insoluble in wat…
a. KBr: Soluble (S) b. PbCO₃: Insoluble (I) c. zinc hydroxide: Insoluble (I) d. sodium acetate: Soluble (S) e. silver iodide: Insoluble (I) f. zinc carbonate: Insoluble (I) g. sil…
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which substance is a metal found in earth’s crust and formerly used in …
lead
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which is a substance made up of durable fibers that resist heat and fir…
asbestos
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ami day: nomenclature for acids name correctly name the following acids…
1. Hydrosulfuric acid 2. Oxalic acid 3. Hydrofluoric acid 4. Boric acid 5. Hydrophosphoric acid 6. Nitrous acid 7. Hydrocyanic acid 8. Perchloric acid 9. Hydroselenic acid 10. Pho…
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activity instructions: match the characters and items from the movie on…
1. d 2. b 3. d (Note: There may be a typo in the problem as description f is unused, but based on the movie plot, these are the best matches.) 4. e 5. c 6. a 7. g 8. h Wait, no—3.…
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name: geaneka collan section: unknown n° 13g knowns unknown - (your unk…
Cations present in unknown: $\text{Cu}^{2+}$, $\text{Fe}^{3+}$ Chromatogram sketch description: - A baseline at the bottom with 5 loading points (labeled Cu, Fe, Co, Ni, Unk 13G f…
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experiment 3 data sheet name: section: unknown no knowns unknown - (you…
Cations present in unknown: $\text{Cu}^{2+}$, $\text{Fe}^{3+}$ (no third cation present) Chromatogram sketch summary: - Solvent front (dashed line) at 22 cm from origin - $\text{C…
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4. which intermolecular force is responsible for the unique properties …
C) Hydrogen bonding --- ### Question 5 (CO₂ Molecular Shape)
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directions: use dimensional analysis to perform the following calculati…
\(\boxed{1.27\times10^{23}\text{ molecules}}\)
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set b: test on properties of ionic & covalent compounds, imfs, molecula…
1. C) Low boiling point 2. B) Sharing of electrons 3. B) H₂O
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15. which of the following is the correct first step of the scientific …
15. C. Ask a question 16. C. Whether a test measures what it claims to measure 17. C. In-depth interviews and non-numerical data 18. B. Numerical data 19. B. Repeated data collect…
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10. two atoms of the same element with different mass numbers are calle…
A. isotopes
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4. the atomic mass of oxygen is 16. how many neutrons does oxygen have …
○ 8
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guided practice the half - life of carbon - 14 is 5,730 years. if a sam…
2010 + 5730 = 7740, so the correct option is C. 7740
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8. sugarcane is an example of a plant that can be used to produce which…
ethanol
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day 1 – key vocabulary and concepts name date match the science vocabul…
1. M. Reactivity 2. K. Organic Compounds 3. H. Mixture 4. F. Electron 5. B. Atomic Number 6. L. Proton 7. E. Electron Shells 8. I. Neutron 9. N. Valence Electrons 10. A. Atomic Ma…
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other organic fuels you have just learned about biomass fuels. now matc…
1. fossil fuel → fuel derived from the remains of organisms that lived long ago 2. bioconversion → the conversion of organic materials into fuels 3. petroleum → a liquid fossil fu…
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which of the following will help control the growth of microorganisms i…
1. Controlling time and temperature 2. Staples from food packaging and broken glass 3. Orange juice is served to customers in a plastic pitcher.
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guided practice fuel that is formed from burning recently living, organ…
B. biomass fuel
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day 1 - 8th grade science staar review matter and energy - teks 8.5a (r…
4. B. Particle B 5. A. 1 electron 6. D. Sodium is the only element with 11 protons. 7. C. Atom B, because it gives up a valence electron.
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7. light energy from the sun is converted by plants into ______. electr…
○ chemical energy
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5. which would not form an organic fuel? ○ oxen ○ bones ○ trees ○ plant…
bones
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3. compounds that contain only carbon and hydrogen are ______. ○ fossil…
○ hydrocarbons
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3. an iphone weighs 129 g. 0.67% of that mass is lithium (li). how many…
Approximately \( 7.5\times 10^{22} \) lithium atoms (or more precisely around \( 7.5\times 10^{22} \)) ### Question 4
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2. ethane, with the chemical formula c₂h₆, is an example of ____. a kin…
a hydrocarbon
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you have just learned about energy from organic fuels. now match each t…
1. fuel → any substance from which energy can be obtained 2. anthracite coal → a compound made only of carbon and hydrogen 3. fossil fuel → fuel derived from the remains of organi…
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guided practice which chemical formula represents a hydrocarbon compoun…
A. $\text{C}_8\text{H}_{18}$
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use the chemical equation below to answer the next four questions. __na…
d. 2,1,2,1 --- ### Question 10
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ppb stands for: parts per billion parts per bluff parts per buffer part…
A. parts per billion
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concentrations can be expressed as a ratio. for example, if a solution …
1:100
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7. | | °c | °f | k | | room temperature | 25 | 77 | 298.15 | | ice wate…
For the freezing point (ice water), the thermometer readings match the accepted values (deviation \( 0^\circ \text{C} \), \( 0^\circ \text{F} \), \( 0 \text{ K} \)). For the boili…
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to make soap, 12 grams of sodium hydroxide are added for every 100 mill…
Slope intercept form: $y = \frac{100}{13}x$
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temperature (18 pts.) 7. | | °c | °f | k | | room temperature | | | | |…
### Question 7: Filling the Temperature Table #### Step 1: Recall Temperature Conversion Formulas - Celsius to Fahrenheit: \( ^\circ\text{F} = \frac{9}{5}^\circ\text{C} + 32 \) - …
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composition of matter directions: match the terms in column ii with the…
s: 1. f 2. h 3. e 4. d 5. a 6. b 7. c 8. g 9. i 10. americium 11. aluminum 12. silicon 13. magnesium 14. titanium 15. lead
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which type of change does the statement describe? particles rearrange i…
| Physical Change | Chemical Change | |-----------------|-----------------| | There is no change in the chemical properties of the substance. <br> Particles retain their compositi…
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drag each tile to the correct box. arrange the sublevels in ascending o…
s sublevel < p sublevel < d sublevel < f sublevel
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composition of matter directions: choose the correct category from the …
s for Part 1 (1 - 15): 1. b 2. a 3. d 4. e 5. c 6. b 7. b 8. e 9. e 10. c 11. a 12. d 13. f 14. f 15. a
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think it over 4. give an example name a colloid that you can see throug…
A common example of a colloid that you can see through is a dilute gelatin solution (liquid gelatin) or a starch solution (when dilute). (A more precise example is a hydrophilic c…
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picture this 1. determine what element is the wire made of? what elemen…
Wire: Likely **Copper (Cu)** (common metal conductor). Tank element: If gas, **Oxygen (O₂)** or **Hydrogen (H₂)**; if liquid, **Mercury (Hg)**; if solid, **Sulfur (S)** (depends o…
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match each pollutant with its health effect. match\tterm\tdefinition \t…
- Carbon dioxide: B) Dizziness, fatigue, headache, disorientation, shortness of breath - Nitrogen oxides: A) Irritate lungs, dizziness; seizures, or death - Volatile organic compo…
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module 18 classification of matter 1 composition of matter before you r…
Matter is classified by composition (pure substances: elements, compounds; mixtures: homogeneous, heterogeneous) and state (solid, liquid, gas). (If you had a specific question li…
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how can photochemical smog impact the environment? it can increase the …
It can decrease the crop yield in a region.
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volatile organic compounds released from an industrial building is poll…
false
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(04.03r mc) erosion of certain old buildings may be worsened in big cit…
A. acid deposition; air pollutants and particular matter
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4. | | erlenmeyer flask | beaker | | volume of water from glassware as …
The graduated cylinder will give a more accurate measure of liquid.
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exit ticket (limiting and excess reactants, stoichiometry and % yield) …
$173\ \text{grams}$
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the rate constant, k, for a first-order reaction is equal to 4.20 × 10⁻…
\(t_{\frac{1}{2}} = 1.65\times10^{3}\ s\) (the option: \(t_{\frac{1}{2}} = 1.65\times10^{3}\ s\)) ### Second Question (Reaction rate relationship)
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exit ticket (limiting and excess reactants, stoichiometry and % yield) …
73.6%
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ch₄ + 2o₂ → co₂ + 2h₂o, what is the coefficient in 2h₂o
The coefficient in \(2H_2O\) is 2.
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given the following rate law, how does the rate of reaction change if t…
The rate of reaction will increase by a factor of 8 ### Question 2
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use the text below to answer the question. phase is the state of matter…
B. liquid
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matter is a substance that has volume and mass. volume means that it ta…
C. The oil floats on top of the water.
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which set of characteristics best describes sedimentary rock? a largest…
B. often contains layers, forms near sources of water, contains fossils
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based on the reaction and model below, what should be change about the …
One Fe atom be added to the reactant and one Fe2O3 molecule should be added to the product
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based on the model below, what balanced chemical reaction is shown? * r…
Reaction 1: $1\text{Au}_2 + 3\text{H}_2\text{S} ightarrow 2\text{Au} + 3\text{H}_2 + \text{S}$
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2 c₂h₆(g) + 7 o₂(g) → 4 co₂(g) + 6 h₂o(l) ○ synthesis ○ decomposition ○…
Combustion
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igneous rocks can be formed from magma that solidifies deep beneath the…
B. Metamorphic rock because of its stripes.
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part 1: elements and symbols each element has a one- or two-letter symb…
s A. 1. $H$; 2. $O$; 3. $Na$; 4. $Cl$; 5. $Ca$ B. 6. Potassium; 7. Magnesium; 8. Nitrogen; 9. Aluminum
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term definition 2. compound b. a substance made of only one type of ato…
3. Chemical Formula —— C. A shorthand way to show which elements are in a substance ### 4. Nomenclature - Definition Matching
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key vocabulary match each term with its correct definition. term defini…
The definition "A substance made of two or more different elements chemically combined" (option A) does not match the term "Element". This definition actually describes a "Compoun…
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atb february 6, 2026 the correct order for intermolecular forces from s…
C. hydrogen bonding > dipole - dipole forces > London dispersion