Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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the solubility of glucose at 30°c is 125 g/100 g water. a solution is m…
supersaturated
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use the table to compare the solubilities of substances. check all of t…
Aspirin is less soluble than table salt, but more soluble than carbon dioxide. A saltwater solution can be made by dissolving 20 g NaCl in 50 mL water. A saturated solution of tab…
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pellets of calcium chloride are spread on a sidewalk covered in water t…
People walking on the sidewalk crush the calcium chloride pellets.
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the polar isopropanol molecules are attracted to the polar water molecu…
All statements are correct.
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what causes different colors to appear in the sky? the absorption of li…
the scattering of light by air molecules (assuming this was an option not clearly visible in the provided image but is the correct answer; if we consider the given options as they…
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question 20 (0.5 points) give the formula from the systematic name vana…
B. V, S. $(OH)_4$
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question 19 (0.5 points) give the formula from the systematic name mang…
B. Mn, J. Se7
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question 18 (0.5 points) give the formula from the systematic name (a m…
B. Na, Q. K, R. SO₄
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question 17 (0.5 points) give the formula from the systematic name moly…
B. Mo, T. $HPO_{3}$
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question 16 (0.5 points) give the formula from the systematic name alum…
D. $Al_4$, K. $C_3$
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question 15 (0.5 points) give the formula from the systematic name iodi…
B. I, U. $Cl_7$
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question 14 (0.5 points) give the formula from the systematic name lith…
1. A. $Li_2$ 2. E. $SO_3$
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question 13 (0.5 points) give the formula from the systematic name zinc…
B. Zn, G. $(C_{2}H_{3}O_{2})_{2}$
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question 12 (0.5 points) give the formula from the systematic name pota…
D. K, G. S
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question 11 (0.5 points) give the formula from the systematic name dini…
C. $N_2$, F. $S_3$
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question 10 (0.5 points) give the best systematic name for the compound…
C. chromium (II), E. phosphide
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question 9 (0.5 points) give the best systematic name for the compound …
B. tricarbon, J. tetraphosphide
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question 8 (0.5 points) give the best systematic name for the compound …
1. B. tetratungsten 2. F. pentacarbide
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question 7 (0.5 points) give the best systematic name for the compound …
A. beryllium F. dihydrogen phosphate
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question 6 (0.5 points) give the best systematic name for the compound …
A. selenium G. hexabromide
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question 5 (0.5 points) give the best systematic name for the compound …
A. strontium, E. cyanide
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question 4 (0.5 points) give the best systematic name for the compound …
1. D. nickel (II) 2. F. nitride
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question 3 (0.5 points) give the best systematic name for the compound …
1. B. titanium (III) 2. E. nitrite
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give the best systematic name for the compound p₂s₅ __1__ __2__ a. phos…
B. diphosphorus, F. pentasulfide
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question 1 (0.5 points) give the best systematic name for the compound …
1. B. barium 2. E. oxide
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3. an atom has 17 protons and 18 neutrons. identify the element and wri…
3. Element: Chlorine (Cl), Mass number: 35 4. Electron - configuration: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}$
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answer the following: 1. who proposed that atoms are indivisible and ca…
1. Democritus 2. J. J. Thomson 3. The atom has a small, dense, positively - charged nucleus. 4. James Chadwick 5. Atomic number 6. Number of Protons; Number of Electrons (in a neu…
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5. give the noble gas electron configuration for thallium, element 81, …
[Xe] 6s$^2$ 4f$^{14}$ 5d$^{10}$ 6p$^1$ with orbital - box representation as described above.
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1. why is scientific notation important in chemistry and other sciences…
1. Scientific notation is important as it simplifies handling of large and small numbers. Examples: mass of an electron, Avogadro's number. 2. Accuracy is closeness to true value,…
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4. give the electron configuration for the only sulfur ion using orbita…
$[Ne]3s^{2}3p^{6}$
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3. give the electron configuration for sulfur using orbital (box) diagr…
[Ne] $\boxed{\uparrow\downarrow}$ $\boxed{\uparrow\downarrow}$ $\boxed{\uparrow}$ $\boxed{\uparrow}$
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2. give the complete electron configuration for the two gallium ions. t…
$Ga^{+}$: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}4s^{2}$; $Ga^{3+}$: $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{10}$
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use the aufbau principle for all problems !!! 1. give the complete elec…
1s²2s²2p⁶3s²3p⁶4s²3d¹⁰4p¹
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give the noble gas abbreviated electron configuration for sulfur using …
1. 16 2. 10 3. 10 4. Ne 5. c (3s orbital filled with 2 paired electrons) 6. dd (3p orbital with 4 electrons, 2 unpaired)
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give the noble gas abbreviated electron configuration for the only sulf…
1. 18 2. 10 3. 10 4. Ne 5. d 6. jj
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1. why is scientific notation important in chemistry and other sciences…
Scientific notation is important in chemistry and other sciences because it simplifies the representation of very large or very small numbers. For example, Avogadro's number ($6.0…
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1. why is scientific notation important in chemistry and other sciences…
Scientific notation is important in chemistry and other sciences as it simplifies handling of extreme - value numbers. For example, Avogadro's number is $6.022\times 10^{23}$, whi…
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give the noble gas abbreviated electron configuration for thallium, ele…
1. 81 2. 54 3. 54 4. Xe 5. s$^2$ 6. f$^{14}$ 7. d$^{10}$ 8. p$^{1}$
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which phrase describes air density? increases as altitude increases equ…
equals mass divided by volume
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give the noble gas abbreviated electron configuration for the two thall…
1. 80 2. 54 3. Xe 4. $s^{0}$ 5. $f^{14}$ 6. $d^{10}$ 7. $p^{2}$
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carrie is conducting an experiment on a solution. the solutions initial…
B. a strong base such as sodium hydroxide (NaOH)
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buffers are weak acids or weak bases that can react with strong acids a…
prevent sudden changes in pH
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buffers are choose weak acids or weak bases that can react with strong …
weak acids or weak bases
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11. choose the best answer. a(n) ____ builds and maintains machines suc…
A. engineer
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for these reasons, blood is an example of which type of mixture? a. a s…
C. a suspension
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blood is a mixture of a variety of materials. some of the materials are…
None of the above options are correct as blood is a heterogeneous mixture, but if we have to choose from the given options, neither A. a solvent nor B. a solution is correct.
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label the diagram to show how hydrogen bonds form. a label may be used …
The oxygen atom of one water molecule is labeled 'O'. The hydrogen atoms of the water molecule are labeled 'H'. The hydrogen atom that is part of the hydrogen - bonding interactio…
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consider the lewis electron formulas for the following four lanthanum h…
1. E. +3 or 3 2. G. 0 3. G. 0 4. E. +3 or 3 5. H. 6 6. G. 0 7. F. 8 8. A. - 2
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consider the lewis electron formulas for the following four helium has …
1. G 2. G 3. F 4. G 5. G 6. C 7. G 8. D
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give the noble gas abbreviated electron configuration for sulfur using …
1. 16 2. 10 3. 10 4. Ne 5. s$^2$ 6. p$^4$ (with box - orbital representation: for 3s: c, for 3p: dd)
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give the complete electron configuration for the two gallium ions. do n…
1. F. 30 2. M. 3d¹⁰ 3. S. 4s⁰ 4. R. 4p⁰ 5. H. 28 6. M. 3d¹⁰ 7. S. 4s⁰ 8. R. 4p⁰
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give the complete electron configuration for gallium. do not use the no…
1. G. 31 2. O. $4s^{2}$ 3. M. $3d^{10}$ 4. U. $4p^{1}$
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5. free verse gives a poet many ways to create musical language, but on…
D. a strict rhyme scheme
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properties of water 2 properties of water when amanda poured some of th…
When Amanda poured some of the liquid in a test tube, she noticed that the edges of the water curved upward, which is an example of adhesion. When Pol filled another test tube to …
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properties of water 2 properties of water 3 quiz: properties of water a…
The first situation (edges of water curving upward) is an example of adhesion. The second situation (liquid forming a low dome) is evidence of cohesion.
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properties of water 2 properties of water 3 quiz: properties of water v…
1. Capillary action 2. Surface tension 3. Polarity 4. Hydrogen 5. Neutral 6. Water
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35. for each compound (all water soluble), would you expect the resulti…
a. Yes b. No c. Yes d. No
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2. describe the property of water that is indicated by the data. how is…
Water has a high specific heat capacity compared to sand. This is because of the hydrogen - bonding between water molecules. Hydrogen bonds are relatively strong intermolecular fo…
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read this excerpt from the song of wandering aengus by william butler y…
C. XAXA
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read this excerpt from the song of wandering aengus by william butler y…
The predictable rhyme scheme highlights the narrator’s ease and contentment.
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1. given the distribution of charges shown in this water molecule, why …
A water molecule is called polar because oxygen's higher electronegativity causes an unequal distribution of charge, with a partial negative charge on oxygen and partial positive …
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read this excerpt from \into the twilight\ by william butler yeats. you…
D. AXAX
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read this excerpt from the song of wandering aengus by william butler y…
A. XAXA
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read this excerpt from the song of wandering aengus by william butler y…
The predictable rhyme scheme supports the peaceful ending.
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fill in the blank question the compounds that keep the acid - base bala…
buffers
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a student separated an unknown mixture of ions using the procedure of p…
b. The Cu²⁺ sample was contaminated with Co²⁺ and Fe³⁺.
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demareass employer has started using a new industrial cleaner. even tho…
No
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select the chemical hazards that can be particularly hazardous to worke…
B. Carbon monoxide, C. Hydrogen sulfide, D. Welding fumes, E. Solvent vapors
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washing your hands and face before eating or drinking outside of a sili…
B. Change into disposable or washable work clothes at the worksite, if possible
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employers can protect workers from chemical hazards by training them on…
Actively monitor for chemical hazards on affected worksites
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f. density of a solid table 3.12 (data) mass of beaker + stopper 110.26…
Stopper mass: 26.54 g Stopper volume: 6.0 mL Stopper density: 4.42 g/mL
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dr. kelvin makes three chemical mixtures in his lab. he records the tem…
Mixture B
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powers: the scientific method: what is science? how do i ... the scient…
the solids put into the water
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*75. make the following conversions: a. 0.44 ml/min to microliters per …
a. Approximately 7.33 μL/s b. 78.6 mg/mm² c. 1.54 g/cm³
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a chemical compound in your toothpaste helps protect your teeth from de…
The elements in the compound $\text{Na}_{2}\text{PO}_{3}\text{F}$ are sodium (Na), phosphorus (P), oxygen (O), and fluorine (F).
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identify the positive and negative regions of these two molecules to sh…
Positive regions are areas with partial positive charge (e.g., near less - electronegative atoms in a polar bond). Negative regions are areas with partial negative charge (e.g., n…
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70. three balloons filled with neon, carbon dioxide, and hydrogen are r…
The neon - filled balloon will rise. The carbon - dioxide - filled balloon will sink. The hydrogen - filled balloon will rise rapidly.
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identify four unique characteristics of compounds.
1. Definite composition (fixed ratio of elements). 2. Unique chemical properties (different from constituent elements). 3. Fixed melting and boiling points. 4. Can only be separat…
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*69. a shiny, gold - colored bar of metal weighing 57.3 g has a volume …
No, the bar of metal is not pure gold.
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compare and contrast the characteristics of carbon - 14 by completing t…
1. Carbon - 14 is radioactive because it has an unstable nucleus that decays over time. 2. Knowing the half - life of carbon - 14 enables scientists to perform radiocarbon dating …
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complete the paragraph below using the terms listed to the left. a subs…
1. element 2. isotope 3. compound 4. covalent bond 5. ion 6. ionic bond 7. van der Waals force 8. ionic bond
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vocabulary compare the terms in the table by defining them. atom electr…
Atom: The basic unit of matter. Nucleus: The central part of an atom containing protons and neutrons. Proton: A positively - charged particle in the nucleus. Neutron: A neutral pa…
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3.1 using and expressing measurements 56. three students made multiple …
Colin: Low accuracy, low precision. Lamont: Moderate accuracy, high precision. Kivrin: Low accuracy, high precision.
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draw a potential energy diagram for an bond that has a longer bond leng…
Sketch a potential - energy curve with the minimum at a distance greater than 74 pm and with a lower bond - energy value (smaller energy difference between minimum and separated a…
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when there is more than one possible lewis structure, _______ helps you…
formal charge
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give the complete electron configuration for the yttrium ion in problem…
1. F. 36 2. O. $4s^{2}$ 3. M. $3d^{10}$ 4. P. $4p^{6}$ 5. R. $5s^{0}$ 6. S. $4d^{0}$
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what does yttrium do to become stable? y will __1__ and have a __2__ ch…
1. B. lose 3 electrons 2. H. +3
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give the complete electron configuration for yttrium. do not use the no…
1. H. 39 2. O. $4s^2$ 3. M. $3d^{10}$ 4. P. $4p^6$ 5. Q. $5s^2$ 6. N. $4d^1$
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the greater the difference in electronegativity, the the longer the bon…
greater the ionic character
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give the complete electron configuration for the sulfur ion in problem …
1. E. 18 2. L. $3s^{2}$ 3. J. $3p^{6}$
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what does sulfur do to become stable? s will __1__ and have a __2__ cha…
1. C. gain 2 electrons 2. I. - 2
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89. how many molecules are in each sample? a. 6.5 g h₂o b. 389 g cbr₄ c…
a. Approximately $2.17\times 10^{23}$ molecules b. Approximately $7.04\times 10^{23}$ molecules c. Approximately $4.16\times 10^{23}$ molecules d. Approximately $1.10\times 10^{23…
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give the complete electron configuration for sulfur. do not use the nob…
1. D. 16 2. L. 3s² 3. K. 3p⁴
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note that a probability map is not the same as a balloon model __1__ is…
1. (b) 2. (a)
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use the theoretical maximums to answer the following: how many electron…
1. D. 10 2. F. 14
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use the theoretical maximums to answer the following: how many subshell…
1. C. 4 2. B. 5
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23/46 the dotted lines in this structure represent select all correct o…
a hybrid bond that is halfway between a double and single bond, equivalent resonance structures, delocalised electrons
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use the theoretical maximums to answer the following: how many electron…
1. E. 32 2. A. 50
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17/46 which elements do not get octets when covalently bonding? select …
A. B, B. H
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to draw a lewis dot model you have to know. select all correct options.…
C. the number of valence electrons an atom has, D. the group an element is in