Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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choose the correct set of variables to solve the following problem: wha…
The second option: \(P = 1.2\) atm, \(V=x\) (unknown), \(n = 3.2\) mol, \(T = 293K\)
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what is the pressure exerted by 5.00 moles of nitrogen gas contained in…
$4.08\ \text{atm}$
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which of the following is not a factor in the ideal gas law? amount of …
Type of container
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how many atoms of na are present in 1.15 moles of sodium? 6.92×10²¹ ato…
\(6.92\times 10^{23}\text{ atoms Na}\)
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how many moles are present in 3.25×10²⁴ atoms p? 1.96×10⁴⁸ moles p 0.18…
5.40 moles P
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what volume, in milliliters, of 0.100 m hclo₃ is required to neutralize…
$64.5$
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how many atoms of zn are present in 10.0 moles of zinc? 6.02 x 10^{23} …
\(6.02\times 10^{24}\text{ atoms Zn}\)
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how many moles of cu are present in 1.51 x 10²² atoms cu? 9.09 moles cu…
\(0.0251\) moles \(\text{Cu}\) (the second option).
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how many moles of cu are present in 8.99 x 10^{25} atoms cu? 4.51 x 10^…
149 moles Cu
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how many moles are present in 3.01 x 10^{23} atoms c? 3.01 x 10^{23} at…
\(0.500\) moles C
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how many atoms are present in 7.0 moles ca? 7.0 moles ca 1.2×10^{-23} a…
\(4.2\times 10^{24}\space\text{atoms Ca}\) (the third option)
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a 20.0 ml solution of naoh is neutralized with 51.1 ml of 0.200 m hbr. …
\(0.511\)
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how many moles of s are in 2.4 x 10^{24} atoms of sulfur? \\frac{2.4 x …
\(4.0\) moles \(S\)
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teen studies better cleaning through chemistry by bethany brookshire sc…
To describe an experiment designed and completed by a young scientist.
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calculate the number of moles in 2.4 x 10²⁴ atoms s. what goes in the g…
1.0 mole S
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calculate the number of moles in 2.4 x 10²⁴ atoms s. what goes in the g…
\(6.02\times 10^{23}\space atoms\space S\)
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using correct scientific notation, how many atoms of k are in 3.0 moles…
\(1.8\times 10^{24}\text{ atoms }K\)
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what does the variable \ represent in the ideal gas law?
moles
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10. the element with atomic number 11 is: a) sodium (na) b) magnesium (…
A. Sodium (Na)
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calculate the number of atoms in 3.0 moles k. what goes in the green bl…
$6.02\times 10^{23}$ atoms K
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calculate the number of atoms in 3.0 moles k. what goes in the green bl…
$1.0$ mole K
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how many moles of propane gas are in a 7.0 l tank at 20°c and 5.45atm o…
1.59 mol
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8. what does the mass number of an atom represent? a) the total number …
8. B. The total number of protons and neutrons 9. B. 8
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6. if an atom has 17 protons, 18 neutrons, and 17 electrons, its mass n…
6. C. 35 7. B. 20
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what volume, in milliliters, of 0.20 m hcl is required to neutralize 30…
$120$
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calculate the volume that a 0.323 - mol sample of a gas will occupy at …
7.81 L
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4. an atom of carbon - 14 contains a) 8 protons, 6 neutrons, and 6 elec…
4. C. 6 protons, 8 neutrons, and 6 electrons 5. B. Protons
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quiz 5 unit 3 atoms and subatomic particles 1. what greek philosopher w…
1. A. Democritus 2. D. 4 3. A. 39
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which of the following variables is not correctly matched with its valu…
The variable \( P = 20^{\circ}C \) is not correctly matched. Pressure (\( P \)) should have units like atm, Pa, etc., not \( ^{\circ}C \) (which is for temperature).
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vocabulary master name date match each word with its definition. 1. maq…
1. h 2. e 3. l 4. j 5. g 6. i 7. o 8. a 9. d 10. m 11. b 12. n 13. c 14. f 15. k
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if the pressure exerted by a gas at 25 degrees c in a volume of 0.044 l…
\(0.0069mol\)
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bromine is found in group 17 and period 4. what does this tell you? a. …
A. It has 7 valence electrons and 4 electron shells.
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the valence electrons are found... a. in the innermost electron shell. …
C. in the outermost electron shell.
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scientist albert einstein is revered as one of the greatest physicists …
D. intersected
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select the fourth definition in this dictionary entry. concentration \\…
The act of focusing on a single object or activity.
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question 1/3 two electrons grouped together on an electron shell are ca…
B. electron pairs.
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stainless steel is a metal alloy that combines the most desirable prope…
A. beneficial
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select the etymology in this dictionary entry. premium \\pree-mee-uhm\\…
— from Latin (praemium)
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fill in the blanks the periodic table of the elements has vertical that…
The Periodic Table of the Elements has vertical groups that tell you the number of valence electrons and horizontal periods that tell you the number of electron shells.
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try these: $\\square ca+\\square o_2\\to\\square cao$ $ca=$ $o=$ $ca=$ …
1. \(2Ca + O_{2} ightarrow2CaO\) (Left: \(Ca = 2\), \(O = 2\); Right: \(Ca = 2\), \(O = 2\)) 2. \(N_{2}+3H_{2} ightarrow2NH_{3}\) (Left: \(N = 2\), \(H = 6\); Right: \(N = 2\), \(…
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chapter 4 name class blm 4 multivalent ionic compounds goal • to write …
For gold(I) and sulfur: gold(I) sulfide. For tin(IV) and chlorine: tin(IV) chloride.
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equal volumes of 0.2 m solutions of lead(ii) nitrate and potassium brom…
A. \(Pb^{2 +}(aq)+2Br^{-}(aq)\to PbBr_2(s)\)
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part vi. write the unabbreviated electron configurations of the followi…
- Sodium: \(1s^{2}2s^{2}2p^{6}3s^{1}\) - Iron: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{6}\) - Bromine: \(1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{5}\) - Barium: \(1s^{2}2s…
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a particle diagram for a chemical reaction is shown. 21 mark for review…
B. \(AgNO_{3}(aq)+KCl(aq)\to AgCl(s)+KNO_{3}(aq)\)
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na₂co₃(aq) + 2 hcl(aq) → 2 nacl(aq) + h₂o(l)+co₂(g) a student combined …
A. Bubbles formed when the two solutions were combined.
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a student uses a spectrophotometer to analyze a solution of blue food d…
A. The measured absorbance would be too low, because the distilled water left in the cuvette would slightly dilute the solution.
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hair loss is a side effect of which of the following types of cancer tr…
D. chemotherapy and radiation
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based on their lewis diagrams, which of the following pairs of liquids …
A. \(CH_3CH_2OH\) and \(H_2O\)
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in the gas phase reaction represented by the following equation, methan…
D. Water, because water molecules can form hydrogen bonds with ethanol molecules, but methane molecules cannot.
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a raindrop has a mass of 50. mg and the pacific ocean has a mass of ( 7…
The mass of 1 mole of raindrops is \(3.0\times10^{22}\space g\). The number of moles of raindrops in the Pacific Ocean is \(24\)
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which of the following molecules is least soluble in water? a b c d
B. \(CCl_4\)
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a 50 ml sample of ( c_{6}h_{14}(l) ) is mixed with a 50 ml sample of ( …
C. \(I_{2}\) will be found mainly in the top layer because it will dissolve more in the \(C_{6}H_{14}(l)\)
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to determine the charge of copper in copper(ii) chloride, you should lo…
romano
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select all the correct statements about copper(i) chloride and copper(i…
# Explicación breve: - El cloruro de cobre(I) es un sólido blanco y tiene un punto de fusión de 498°C. - El cloruro de cobre(II) tiene un carga de +2. # Respuesta: - "Copper(I) ch…
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a mixture containing equal numbers of moles of ethyl acetate and butyl …
B. Ethyl acetate, because it has a shorter carbon chain and weaker London dispersion forces
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a poem with fourteen lines and a mixed rhyme scheme is a foil couplet s…
sonnet
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the diagram above represents a solution of ions in water. which of the …
B. Ion \(X\) is \(Na^+\), and ion \(Y\) is \(F^-\)
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1) ____n₂ + ____h₂ → ____nh₃
\(1N_{2}+3H_{2}\to2NH_{3}\)
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to determine the moles of fe³⁺(aq) in a 100. ml sample of an unknown so…
\(n = 4\times10^{-6}\space mol\), so the answer is C.
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solid al(no₃)₃ is added to distilled water to produce a solution in whi…
B. \(0.033M\)
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directions: each set of lettered choices below refers to the numbered s…
B. Brønsted - Lowry acid base reaction
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3 fill in the blank complete the following decay equation. note: you wi…
The completed equation is \(_{54}^{152}Xe ightarrow_{55}^{152}Cs+_{-1}^0e\). The type of decay is Beta (\(\beta^-\)) decay.
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2 al(s) + 6 hcl(aq) → 2 alcl₃(aq) + 3 h₂(g) according to the reaction r…
B. 9.0 g
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4 fes(s) + 7 o₂(g) → 2 fe₂o₃(s) + 4 so₂(g) due to the presence of fes(s…
D. \(FeS(s)\) is the limiting reactant and \(0.5\ mol\) of \(O_{2}(g)\) remains unreacted.
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treats cancer by removing it. a. chemotherapy b. immunotherapy c. surge…
C. Surgery
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gaseous hydrogen and gaseous chlorine can react to form hydrogen chlori…
A. The pressure will remain constant because the number of gas particles is constant.
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he prop r s, and draw the lewis dot diagram, including the written conf…
Group #: 1 Period #: 4 # protons: 19 # of electrons: 19 # of energy shells: 4 # of valence electrons: 1 Lewis dot diagram: \( \text{K}\cdot \)
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1. a magnesium - 26 atom is an isotope of magnesium (mg) with a mass nu…
12 protons, 14 neutrons, 12 electrons.
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the chemical formula for zinc nitrate is: zn(no₃)₂ calculate the molar …
\(189.4\space g/mol\)
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the chemical formula for propane is: ch₃ch₂ch₃ calculate the molar mass…
$44.09$
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3. cornelius drebbel and robert boyle both made important discoveries a…
Drebbel, an alchemist, did not keep good records while Boyle, a scientist, carefully recorded his discoveries for others to reproduce.
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try again the answer has not been rounded correctly. the chemical formu…
\(74.12\space g/mol\)
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which offers coverage for the following services: hospitalization, diag…
d. BCBS major medical (MM) coverage
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read the excerpt from \sonnet 29.\ when, in disgrace with fortune and m…
A. abab
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types of bonds: intramolecular bonding intramolecular bonding: the chem…
- Ionic: - Type of elements: Metals and non - metals. - How new compounds formed: Electrons are transferred from metal atoms (forming cations) to non - metal atoms (forming anions…
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how does the following chemical equation support the law of conservatio…
The number of atoms on the reactant side is the same as the number of atoms on the product side.
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read the incomplete quatrain. which line completes the quatrains rhyme …
The shore's a backdrop for my lonely day
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from buried sources like underground reservoirs, dramatically increasin…
D. ensuring efficient recycling in nature
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when biogeochemical cycles are impacted by humans, they tend to destabi…
B. positive feedback loop
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applying concepts from which category of elements would you choose to m…
Metals. Because metals are malleable and ductile and can absorb impact without shattering, while non - metals are brittle and would shatter if dropped and metalloids are not as im…
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which statement is true about metals? they are poor conductors. they ar…
They are excellent conductors.
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understanding concepts 2 classifying compare the prop- erties of metals…
Metals: shiny, malleable, ductile, good heat/electricity conductors, lose electrons in reactions. Non - metals: dull, brittle, poor heat/electricity conductors, can gain or share …
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choose the correct answer. which of the main four elements is shown her…
El fuego
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rogue heart by axie oh (excerpt) the dreamers gather in neo beijings st…
B. a smooth, curving movement
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how and why do ionic bonds form? check all of the boxes that apply. □ l…
B. Ionic bonds form between metal atoms and nonmetal atoms. D. The less electronegative atoms transfers one or more electrons to the more electronegative atom. E. The metal atom f…
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which of the bonds in the following groups, i - ii, has the shortest bo…
B. \(S - F\), \(C\equiv O\)
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2. a solution of sodium hydroxide is standardized against potassium hyd…
The molarity of the NaOH solution is approximately \(0.0716\text{ M}\)
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describe one way the modern periodic table is similar to mendeleevs cha…
One way the two tables are similar is that elements in groups (families) show similar chemical properties. One way the two tables are different is that the modern periodic table i…
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the davis family grows organic vegetables to sell at a local farmers ma…
an increase in the cost of farm equipment, a rise in demand for organic produce, an increase in customers at the market
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1. what is potassium hydrogen phthalate? for what is it used?
Potassium hydrogen phthalate (\(KHP\), \(C_8H_5KO_4\)) is an organic compound. It is used as a primary standard in acid - base titrations.
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use the drop - down menus below to create a balanced chemical equation.…
The first drop - down menu should be \(2\) (for Fe) and the second drop - down menu should be \(3\) (for \(H_{2}O\)). So the balanced equation is \(Fe_{2}O_{3}+3H_{2}\to2Fe + 3H_{…
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sergio wants to draw a diagram of a neutral oxygen atom with a mass num…
The diagram should include \(8\) protons and \(8\) neutrons.
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foamy chemistry sergio watches a video of a chemistry demonstration. in…
A. Hydrogen peroxide was consumed in the chemical reaction.
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13. what is the shape of the bf₃ molecule? a. tetrahedral c. bent b. py…
13. d. trigonal planar 14. b. It has one unshared pair of valence electrons on the central atom. 15. a. oxygen 16. a. magnesium and fluorine 17. b. a single covalent bond 18. b. b…
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which atmospheric gas is being described? second most abundant, compose…
oxygen
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which choice shows a balanced chemical equation that matches the reacti…
C. \(2H_{2}O_{2}\to2H_{2}O + O_{2}\)
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does the model shown in figure 1 follow the law of conservation of mass…
C. yes, because the number of oxygen and hydrogen atoms in the reactants and products is equal
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the oxygen (o₂) this reaction produces exists as a gas. which part of t…
B. bubbles forming as foam
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a student lights a candle, creating a flame. over time, heat from the f…
B. The flame indicates a chemical change occurred, and the wax melting indicates a physical change.
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the table below shows the properties of cobalt (co) and rhodium (rh). a…
The iridium cube will weigh more than each of the other two cubes. The iridium cube will begin melting after the other two cubes.