Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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consider the composition information from the sds. what is a possible n…
B. Glycerol
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you try determine the ratio of elements in each formula. use a model to…
Element ratio: $\boldsymbol{\ce{C:H:O = 1:2:1}}$; Total atoms per molecule: 24 (scaled by coefficient). ### Problem 2: $\boldsymbol{3\ \ce{Li5(PO4)}}$
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you try determine the ratio of elements in each formula. use a model to…
s (for each formula's element ratio and total atoms): 1. \( \ce{C_6H_{12}O_6} \): Ratio \( \ce{C:H:O} = 1:2:1 \), Total Atoms = 24 2. \( \ce{3Li_3(PO_4)} \): Ratio \( \ce{Li:P:O} …
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food waste pre-reading a. warm-up questions 1. how much of the food tha…
1. f) to not be used as planned, to be put in the garbage 2. h) a single part or amount 3. g) to not think about, to ignore 4. b) to take responsibility for paying for a service o…
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test information description show all you work, including units, on sep…
0.092 cal/g°C (corresponding to the option "0.092 cal/g°C")
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which of the following statements accurately describes vitamins? select…
C. Almost every action in the body requires the assistance of vitamins
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a chemical reaction wherein two molecules combine to form one larger pr…
D. Condensation
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question 10 of 25 which action is most likely to take place in the defi…
D. Determining whether the outside material needed in the game has special licenses
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why would a developer use a flowchart in the design step of the game de…
A. To connect key points in a logical way
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question 4 of 10 which action takes place in the debug step of the game…
B. Looking for errors and determining how best to fix them
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question 2 of 10 what is the importance of the define stage when develo…
C. It helps programmers identify which features are most important.
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46. balance the following reactions. indicate what type of reaction it …
s: 48. $1Zn + 2HCl ightarrow 1ZnCl_2 + 1H_2$ 49. $2NaCl + 1H_2SO_4 ightarrow 2HCl + 1Na_2SO_4$ 50. $1CaCO_3 + 2LiNO_3 ightarrow 1Ca(NO_3)_2 + 1Li_2CO_3$ (Note: This reaction may n…
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16 s how many neutrons would this atom of sulfur have? 16 how many elec…
1. (Incomplete sulfur atom info; assuming common isotope S-32: neutrons=16, electrons=16 if neutral) 2. Protons and neutrons; 200 3. +24 (nucleus has protons only); +2 (protons-el…
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write the compound name for the following formulas. * = polyvalent 1. m…
1. Magnesium Dichromate 2. Potassium Bicarbonate (or Potassium Hydrogen Carbonate) 3. Lead(II) Carbonate 4. Calcium Nitrate 5. Nickel(II) Bicarbonate (or Nickel(II) Hydrogen Carbo…
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in each pair, choose the element with the bigger atoms. note: solve thi…
For each pair, mark: - Sc (over Mn) - Ti (over Cr) - Mo (over Tc) - Y (over Zr) (In the table, mark the circle for Sc, Ti, Mo, Y respectively in their rows.)
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in each pair, choose the element with the bigger atoms. note: solve thi…
- For Mn vs Cr: Cr (select the circle next to Cr) - For Sc vs Ti: Sc (select the circle next to Sc) - For Y vs Nb: Y (select the circle next to Y) - For La vs Hf: La (select the c…
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in each pair, choose the element with the bigger atoms. note: solve thi…
For each pair: - Cd vs Ag: Ag (select the circle next to Ag) - Re vs La: La (select the circle next to La) - Nb vs Mo: Nb (select the circle next to Nb) - Ta vs W: Ta (select the …
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for each of the three structures (with cr as central atom, surrounded b…
For the top structure: \(\boldsymbol{\text{... the same as } A}\) For the middle structure: \(\boldsymbol{\text{... a different compound}}\) For the bottom structure: \(\boldsymbo…
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consider this metal complex: complex a now decide whether each complex …
For the first comparison complex (with 3 Br and 2 F ligands, assuming): \( \boldsymbol{\text{a different compound}} \)
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22. what information can scientists get from observing how much light i…
22. Scientists can determine the chemical composition of the object (e.g., star, interstellar gas) emitting or absorbing the light, as different elements absorb light at specific …
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matching cause and effect weathercasters watch for changes in the solar…
- "Electrons follow magnetic field lines and collide with molecules of gas in the atmosphere" matches with "Increase in aurorae". - "Changing magnetic fields generate electricity …
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continue to next page matching (match the word with the appropriate def…
### Questions 48 - 52: 48. Scale - D 49. Primary Colors - E 50. Focal Point - A 51. Line Flowers - B 52. Mass Flowers - C ### Questions 53 - 57: 53. Secondary Colors - E 54. Propo…
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what style of art abandoned the use of perspective with a single viewpo…
Cubism Shape Unity Sketch
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what style of art abandoned the use of perspective with a single viewpo…
: Cubism Shape Harmony Sketch # Brief Explanations: 1. Cubism rejected single-point perspective, using geometric shapes/plane interlocking. 2. A shape is a closed line, either geo…
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36. how many protons, neutrons, and electrons are located in the follow…
(Chlorine): Protons: \( 17 \), Neutrons: \( 18 \) (for \( ^{35}\text{Cl} \)), Electrons: \( 17 \) ### Problem 36b: Neon (Protons, Neutrons, Electrons)
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3 the element boron has two naturally occurring isotopes – one with an …
B. The one with an atomic mass of 11.01.
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(f) the absorbance of the cuso₄ solution of unknown concentration is 0.…
The molarity of the \( \ce{CuSO4} \) solution is \( \boldsymbol{0.0438 \, M} \) (or values around \( 0.044 \, M \) depending on more precise slope calculation from the graph). ###…
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this model represents a lithium ion. image of lithium ion model with pr…
The first blank: negatively; The second blank: positively
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a charged object, like an ion, can exert an electric force on another o…
The electric force causes them to attract.
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an atom can become an ion by losing electrons to or gaining electrons f…
positively
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an atom can become an ion by losing electrons to or gaining electrons f…
Sodium \(\boldsymbol{\text{loses}}\) an electron, and chlorine \(\boldsymbol{\text{gains}}\) an electron. So the sodium atom becomes a \(\boldsymbol{\text{positively}}\) charged i…
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which of the following sublevels has the highest energy? a 3d b 4s c 3s…
a. 3d
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n l mₗ mₛ 2 x 0 +1/2 n l mₗ mₛ 2 y? 0 +1/2 if the above quantum numbers…
\( 0 \)
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this painting is by pablo picasso, entitled the blind mans meal. what t…
b. He used a monochromatic color scheme, which occurs when one color predominates, shades of black, tints of white, values of a hue.
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fossil fuels are energy from ancient plants and animals. fossil fuels m…
The option "It destroys the environment when fossil fuels are mined from the Earth."
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fossil fuels get energy from ancient plants and animals. fossil fuels m…
B. Natural gas (assuming the options are labeled with identifiers, but based on the content, the correct option is the one with "Natural gas")
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fossil fuels get energy from ancient plants and animals ancient plants …
The sun (the option labeled "The sun" among the choices)
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sediment transport by rivers and streams michael and misha are learning…
D. The investigation examines water’s ability to transport and deposit materials.
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how does the periodic table help us predict the properties of different…
The option "It groups elements with the same number of valence electrons." (the third option from the left, corresponding to the "Collaborations" row's option)
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analyze the periodic table. predict the chemical bonds that might form …
Ionic Bond: sodium (Na) and fluoride (F), magnesium (Mg) and chlorine (Cl) Covalent Bond: oxygen (O) and sulfur (S), carbon (C) and nitrogen (N)
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question 29 (1 point) use the following information to answer the next …
### Question 29 # Explanation: ## Step1: Recall Brønsted definitions A Brønsted acid donates a proton ($\ce{H+}$), a Brønsted base accepts a proton. ## Step2: Analyze Reaction (i)…
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eckpoint: valence electrons and bond formation dec 12, 2025 11:59pm tem…
First drop - down: outermost (valence) Second drop - down: 8
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in a covalent bond, what usually occurs between atoms? transfer of elec…
B. sharing of electrons (assuming the second option is labeled B; if the original options had labels like A, B, C, D with "sharing of electrons" as one, the answer would be the la…
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study the periodic table. which group of elements is known for having t…
B. alkali metals
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analyze the periodic table. periodic table of the elements arrange the …
First box (least reactive): Na Middle box: Rb Last box (most reactive): Fr (Arrangement: Na < Rb < Fr)
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complete the statement by moving the correct option into the box. the n…
electrons
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which of the following substances is a brønsted-lowry acid? ○ $\\ce{co_…
$\ce{H2S(aq)}$ (the option with $\ce{H2S(aq)}$) ### Second Question (Brønsted - Lowry base)
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use the following information to answer the next question. the followin…
(i) and (iii) ### Question 26
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question 24 (1 point) use the following information to answer the next …
The second option (the one with \( K_{a_1} = \frac{[\ce{H3O+}][\ce{H2PO4^-}]}{[\ce{H3PO4}]} \), \( K_{a_2} = \frac{[\ce{H3O+}][\ce{HPO4^{2-}}]}{[\ce{H2PO4^-}]} \), \( K_{a_3} = \f…
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complete the sentence by moving the correct answer to the box. elements…
electrons
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why are alkali metals more reactive than alkaline - earth metals? - alk…
A. Alkali metals have a single electron in their outermost shell, making losing an electron easier.
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use the following information to answer the next question. consider the…
The greater the value of the ionization constant, the higher the concentration of \(H_3O^+(aq)\) and the stronger the acid.
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look at the sulfur atom. 16 sulfur s electron configuration: 2,8,6 comp…
six
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use the following information to answer the next question. carbonic aci…
polyprotic acid (the option with "polyprotic acid" text)
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question 20 (1 point) a _______ is a change in one of the conditions in…
C. stress ### Question 21
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question 19 (1 point) use the following information to answer the next …
B. decrease, become constant
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in the unbalanced chemical equation below, what series of numbers repre…
C. 2, 3, 2 ### Question (Empirical Formula for \( \text{C}_2\text{H}_4 \))
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answer the following question in 3-4 complete sentences. explain the di…
Geometric shapes are regular, precise forms (e.g., triangles, circles), while freeform shapes are irregular, organic, and lack strict symmetry. In *Modern Painting with Clef*, Roy…
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complete the rhyme scheme. a a b b what matter if i stand alone? i wait…
A, A, B, B (for the lines: "What matter if I stand alone?" - A; "I wait with joy the coming years;" - A; "My heart shall reap when it has sown," - B; "And gather up its fruit of t…
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complete the rhyme scheme. a a b b when you and i were young, we knew t…
First line: A, Second line: A, Third line: B, Fourth line: B
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place the coefficients that correctly balance the chemical equation. an…
For \( \text{Fe}_2\text{O}_3 \): 2; For C: 3
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complete the rhyme scheme. a a b b and looking back along the past, we …
First line: A Second line: B Third line: B Fourth line: A
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complete the rhyme scheme. the rooster so politely stands a while waiti…
Third line: C, Fourth line: B
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the lewis dot diagram for water is shown below. select two of the terms…
B. bent, E. polar
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complete the rhyme scheme. let me make the songs for the people, a song…
For the line "Songs to stir like a battle - cry", the rhyme scheme letter is C. For the line "Wherever they are sung", the rhyme scheme letter is B.
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which process is defined as breaking down rocks into smaller pieces wit…
D. mechanical weathering
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the chemical formula for glucose is c₆h₁₂o₆. what is the percent compos…
C. 53.28%
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what is the percent composition of c₂h₂? (molar masses to use: c=12.011…
For Carbon (C): A. C = 92.26% For Hydrogen (H): E. H = 7.74%
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which process is responsible for changing the composition of rock? ○ er…
C. chemical weathering
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question 18 the chemical formula for glucose is c₆h₁₂o₆. what is the pe…
C (53.28%)
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consider the ionic compound: cus copper ii sulfide. why is a roman nume…
C. Copper has two oxidation states (+1 and +2) and the Roman numeral is used to differentiate between the two. ### Question 15 (Fe₂O₃ name)
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which statement about $k_{eq}$ is not true? it is affected by changes t…
It is affected by changes to the equilibrium system. ### Question 10 (About \( K_{eq} \) for \( \ce{N2O4(g) <=> 2N2O(g)} \))
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if a chemical system at equilibrium is disturbed, the rates of the forw…
E. Le Chatelier's Principle ### Question 7
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question 4 (1 point) which is true of the numerical value of the equili…
A. It represents the relative concentration of products compared with reactants. ### Question 5
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question 1 (1 point) a system reaches equilibrium. which must be true o…
C. it is either open or closed ### Question 2
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question 1. name the binary ionic compounds indicated by the following …
a) Potassium Chloride b) Calcium Bromide c) Lithium Oxide d) Magnesium Chloride e) Barium Phosphide f) Aluminum Fluoride g) Cobalt(II) Iodide h) Copper(I) Bromide i) Iron(II) Sulf…
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6. what is an environmental concern for the great lakes? 7. what type o…
Common environmental concerns for the Great Lakes include pollution (chemical, plastic, etc.), invasive species (e.g., zebra mussels), habitat destruction, and climate - related i…
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10. which of the following pairs of technologies and/or techniques is t…
a. Gas chromatography and mass spectrometry ### Numeric Response - Sub - Question 1 (Indoor Fire Scene Investigation Tasks)
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this painting is by pablo picasso, entitled the blind mans meal. what t…
b. He used a monochromatic color scheme, which occurs when one color predominates,shades of black, tints of white, values of a hue.
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determine the oxidation state of the transition metal in each of these …
For \(\boldsymbol{[FeCl_2(CO)_4]Cl}\): \(\boldsymbol{+3}\) For \(\boldsymbol{Na[ZnCl_3(NH_3)]}\): \(\boldsymbol{+2}\) For \(\boldsymbol{Na[MnBr_4(H_2O)_2]}\): \(\boldsymbol{+3}\)
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check the box before each formula that represents a ligand that is like…
- $\boldsymbol{\ce{NO^-_{2}}}$ (check the box before $\ce{NO^-_{2}}$) - $\boldsymbol{\ce{H_{2}O}}$ (check the box before $\ce{H_{2}O}$)
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check the box before each formula that represents a ligand that is like…
- $\boldsymbol{\ce{NO^-_{2}}}$ (check the box) - $\boldsymbol{\ce{H_{2}O}}$ (check the box) (Note: $\ce{KBr}$ and $\ce{FeO}$ are not ligands in their given forms, so their boxes r…
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choose the best answers. 2.1) ____ __ is the kinetic energy of the atom…
B. Thermal energy ### 2.2)
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check the box before each formula that represents a ligand that is like…
The box before \( \boldsymbol{\text{OH}^-} \) should be checked.
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check the box before each formula that represents a ligand that is like…
The box before \( \boldsymbol{\text{H}_2\text{O}} \) should be checked.
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write t for true or f for false. if false, rewrite the sentence to make…
T ### 1.21)
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1.12) ______ what happens to energy when a person eats an apple with su…
C. The energy changes from chemical to mechanical. ### Matching Questions 1. **1.13 Potential**
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choose the best answers. 1.7) ______ in science is the ability to do wo…
A. Energy ### 1.8)
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the difference between two marked values is 5 ml and there are 5 spaces…
1 mL
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calibration of this thermometer is 1°c, which informs us to record the …
31.0 $^\circ$C
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oxygen is acting as an oxidizing agent in all of the following reaction…
C. \(2 \text{ F}_2(\text{g}) + \text{O}_2(\text{g}) ightarrow 2 \text{ OF}_2(\text{g})\)
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the carbon cycle is a model that describes how carbon moves between ear…
- "Carbon dioxide gas in the air dissolves into ocean water, forming carbonic acid, which rapidly breaks down into ions." → Carbon moves from the atmosphere to the hydrosphere. - …
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annotation requires the following 1. number paragraphs 2. write a summa…
Natural Science - Chemistry
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the decomposition of plants plays an important role in the carbon cycle…
Coal is formed from carbon that was taken out of the atmosphere by plants.
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89. draw all of the lewis structures for each of the following mol a. h…
VSEPR notation: \( \text{AX}_4 \) (for C) or \( \text{AX}_2\text{E}_2 \) (for O) – but the correct VSEPR notation for \( \text{CH}_3\text{OH} \) (carbon-centered) is \( \text{AX}_…
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which best describes why absolute zero is the lowest possible temperatu…
A. At absolute zero, the motion of the molecules of a substance almost stops.
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1) methanoic acid is also called formic acid. it has the chemical formu…
\( \approx 2.10 \) ### Problem 2:
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5/10 which best describes why absolute zero is the lowest possible temp…
C. Because of the kinetic energy of molecular motion.
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4. magnets can be used in everyday life. what does mri stand for? what …
- MRI stands for Magnetic Resonance Imaging. - The magnetism in an MRI creates a strong magnetic field that aligns the protons in the body's molecules. This alignment, along with …
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a bowl of hot soup that is left on the counter will eventually cool dow…
1. the heat from the soup moving into the cooler air.