Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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multiple select question select all that apply which two statements des…
- The atoms of the reactants are rearranged to form the products. - The products and reactants must weigh the same.
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name electron configuration is the ______________ of an atom or in atom…
Electron configuration is the distribution of electrons of an atom or in atomic orbitals. Aufbau principle - fill the lowest - energy Pauli Exclusion Principle - maximum of two el…
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mercury metal is poured into a graduated cylinder that holds exactly 22…
Mass: 306.0 g Volume: 22.5 mL Density: 13.6 g/mL
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | Mg²⁺ | PO₄³⁻ | Mg₃(PO₄)₂ | magnesium phosphate | | Pb⁴⁺ | BrO⁻ | Pb(BrO)₄ | lead(IV) hypo…
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complete the table below by writing the symbols for the cation and anio…
| Ionic compound | cation | anion | | ---- | ---- | ---- | | $Mn(CO_3)_2$ | $Mn^{4+}$ | $CO_3^{2 - }$ | | $VBr_5$ | $V^{5+}$ | $Br^-$ | | $(NH_4)_2S$ | $NH_4^+$ | $S^{2 - }$ | | $…
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complete the table below. for example, in the first row decide whether …
| element | most likely ion | | | ---- | ---- | ---- | | | symbol of ion | type of ion | | scandium | $Sc^{3+}$ | cation | | strontium | $Sr^{2+}$ | cation | | iodine | $I^{-}$ | …
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drugs modify the brain chemistry and change behaviors. please select th…
A. T
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balance the chemical equation below using the smallest possible whole n…
$1CH_4(g)+2O_2(g) ightarrow1CO_2(g)+2H_2O(g)$
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a skull and crossbones pictogram indicates this kind of information abo…
Acute Toxicity
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study the following phase diagram of substance x. use this diagram to a…
Solid; Sublime; No phase change
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type the element in each list with the largest atomic radius: na, al, m…
Na Rb Ba Fr
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almost! the wrong number of words are capitalized, so try undoing one o…
After the final exam, Maui's teacher hosts a Bunsen burner hot dog roast for all chemistry students.
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complete the following: 1. for each of the ions listed, identify the to…
1. 1. 10 2. 23 3. 10 4. 48 5. 25 6. 24 7. 2 8. 21 9. 36 10. 76 2. | Ion | Number of Protons | Number of Electrons | | ---- | ---- | ---- | | $Co^{+2}$ | 27 | 25 | | $Co^{+3}$ | 27…
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fill in the missing information: symbol atom or ion? check all that app…
| symbol | atom or ion? check all that apply | number of protons | number of electrons | | ---- | ---- | ---- | ---- | | $O^{2 -}$ | anion | 8 | 10 | | Cu | neutral atom | 29 | 29…
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question 4: this question has two parts. first answer part a. then answ…
Part A: C. $2\text{Na}+\text{Cl}_2 ightarrow2\text{NaCl}$ Part B: D. The number of chlorine and sodium atoms on both sides of the reaction are equal.
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level 1 q1 which of the following chemical formulas represents the nitr…
Q1: A. $N_2$ Q3: B. Nitrates
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carbon reacts with oxygen to produce carbon dioxide co₂(g), δhf = -393.…
-393.5 kJ
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complete the table below by writing the symbols for the cation and anio…
| Ionic compound | Cation | Anion | | ---- | ---- | ---- | | $VI_5$ | $V^{5+}$ | $I^{-}$ | | $NH_4F$ | $NH_4^{+}$ | $F^{-}$ | | $V(OH)_3$ | $V^{3+}$ | $OH^{-}$ | | $Mn(NO_3)_3$ | …
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propane c₃h₈ (g), δh_f = 103.8 kj/mol reacts with oxygen to produce car…
$-2,044.0$ kJ/mol
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when electrons transfer from one atom to another, both atoms become cho…
When electrons transfer from one atom to another, both atoms become ions and an ionic bond forms between the atoms, and the joined atoms become a compound. When electrons are shar…
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question 13 use the figure above to answer the following question(s). a…
tenfold increase in
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according to hesss law, if a series of intermediate reactions are combi…
the sum of the enthalpy changes of the intermediate reactions.
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explain how is the modern periodic table different from mendeleevs peri…
The modern periodic table is based on atomic number instead of atomic mass as in Mendeleev's table. It has a more accurate arrangement of elements considering their chemical prope…
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similar properties figure 2 at room temperature, chlorine is a gas, bro…
They have similar chemical properties and some related physical properties because they are in the same group (halogens) of the periodic table.
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Pb^{4+}$ | $CN^-$ | $Pb(CN)_4$ | lead(IV) cyanide | | $Na^+$ | $NO_2^-$ | $NaNO_2$ | sod…
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical Formula | Name of Compound | | ---- | ---- | ---- | ---- | | $Fe^{3 + }$ | $CrO_{4}^{2 - }$ | $Fe_{2}(CrO_{4})_{3}$ | iron(III) chromate | | $Fe^{3 + …
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question 8 river water held behind a dam is a form of ______. o chemica…
potential energy
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fill in the name and empirical formula of each ionic compound that coul…
| cation | anion | empirical formula | name of compound | | ---- | ---- | ---- | ---- | | $Co^{2+}$ | $NO_3^{-}$ | $Co(NO_3)_2$ | cobalt(II) nitrate | | $Cr^{2+}$ | $BrO_3^{-}$ | …
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match each job example with its career cluster. jake is a flight attend…
Jake (Flight Attendant) - Transportation and Logistics Deb (Video Game Designer) - Information Technology Israel (Cashier) - Marketing, Sales, and Service Arnie (Chemist) - Scienc…
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a penny has a mass of 2.50 g and the moon has a mass of 7.35×10²² kg. u…
$1.51\times 10^{24}\ g$ $4.87\times 10^{6}$
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how many valence electrons are in s²⁻?
8
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the drawing below shows a mixture of molecules: suppose the following c…
(1) Without seeing the actual drawing, we can't give a definite answer. But if we assume we counted and found more $S$ molecules, the answer for "Of which reactant are there the m…
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calculate the volume in milliliters of a 0.160m barium chlorate solutio…
938 mL
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a chemist must dilute 77.9 ml of 3.08 m aqueous sodium chloride (nacl) …
$0.120$
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there are two steps in the extraction of copper metal from chalcocite, …
$2Cu_2S(s)+3O_2(g)+2C(s) ightarrow4Cu(s)+2SO_2(g)+2CO(g)$
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write the electron configuration for a neutral atom of fluorine.
$1s^{2}2s^{2}2p^{5}$
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read each description in the first - column of the table below. if any …
| Description | Does any element match? | If yes, give symbol | | ---- | ---- | ---- | | An element in Period 6 and Group 7A | Yes | At | | A semimetal in Group 5A | Yes | As | | …
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acetylene ($c_{2}h_{2}$) gas is often used in welding torches because o…
1.36 mol
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ammonium phosphate (nh₄)₃po₄ is an important ingredient in many fertili…
$20\ g$
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one - pager graphic organizer: reactivity and the periodic table. use t…
Box 1 - Definitions: - Reactivity: The tendency of an element to undergo a chemical reaction. - Valence Electrons: Electrons in the outermost shell of an atom involved in bonding.…
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what role do bacteria and fungi play in compost? (1 - 2 sentences) * yo…
What role do bacteria and fungi play in compost? They are decomposers that break down organic matter. How does composting help reduce human impact on the environment? It diverts w…
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air is the best way to clean the clutch housing when performing a clutc…
3. c. Both Technician A and Technician B 4. c. Both Technician A and Technician B 5. c. Both Technician A and Technician B 6. c. Both Technician A and Technician B 7. c. Both Tech…
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question 2 2.5 points save answer read the following scenario and answe…
very low oxygen levels and lack of plants to support animal consumers
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10) report the measurement below, in milliliters, to the correct number…
5.9 mL
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box 3: nonmetals reactivity trend draw an arrow showing: most reactive …
For non - metals in order of reactivity: 1. Fluorine (F), 2. Chlorine (Cl), 3. Bromine (Br) | Element | Group | Period | Reactivity (High/Low) | | ---- | ---- | ---- | ---- | | So…
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9) report the measurement below, in milliliters, to the correct number …
65 mL
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8) report the measurement below, in milliliters, to the correct number …
37.5 mL
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7 report the measurement below, in milliliters, to the correct number o…
6.78 mL
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6) report the measurement below, in milliliters, to the correct number …
84 mL
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5) report the measurement below, in milliliters, to the correct number …
7.50 mL
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4) report the measurement below in milliliters to the correct number of…
59 mL
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3) report the measurement below, in milliliters, to the correct number …
5.6 mL
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2) report the measurement below, in milliliters, to the correct number …
6.3 mL
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1) report the measurement below, in milliliters, to the correct number …
36.7 mL
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add or subtract the following measurements. be sure each answer you ent…
10.5 mL 23.47 mL 2.3 mL
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calculate the mass, in grams, of a single rubidium atom ($m_{rb}=85.468…
$1.429\times 10^{-22}$ g
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click to fix any capitalization errors below. click \submit answer\ if …
While studying for his Chemistry exam, Jackson Stewart stumbled upon the formula for a truth serum.
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click to fix any capitalization errors below. click \submit answer\ if …
While studying for his Chemistry exam, Jackson Stewart stumbled upon the formula for a truth serum.
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188.1 g au express your answer in moles to four significant figures
$0.9540\ mol$
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43.0 g al express your answer in moles to three significant figures.
$1.59\ mol$
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25. which type of chemical reaction tends to occur on its own, or spont…
25. Spontaneous reactions. 26. Activation energy. 27. Enzymes lower the activation energy of a chemical reaction.
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click to fix any capitalization errors below. click \submit answer\ if …
Bella Swan spilled Gatorade on her Chemistry 2 notes, so they smelled like fruit punch.
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identifying types of data determine if the data are qualitative or quan…
1. Qualitative 2. Quantitative 3. Qualitative 4. Quantitative 5. Qualitative
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click to fix any capitalization errors below. click \submit answer\ if …
Before Kristoff can begin his chemistry lab, he has to put on his safety goggles.
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click to fix any capitalization errors below. click \submit answer\ if …
While sitting in his honors chemistry class, Olaf invented a new formula for grape soda.
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17. what is the relationship between monomers and a polymer?
Monomers are the individual units that combine to form a polymer.
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part a how much fluorine was formed? express your answer in grams to th…
$25.3$ g
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click to fix any capitalization errors below. click \submit answer\ if …
After the final exam, Maui's teacher hosts a bunsen burner hot dog roast for all chemistry students.
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10 numeric 10 points 1.50 g of nitrogen monoxide react with 2.00 g of o…
\(1.19\ g\)
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wintergreen oil is produced in the following scheme from 6.84g of ch₃oh…
32.5g
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click to fix any capitalization errors below. click \submit answer\ if …
Edward Cullen asked me to be his partner for the Chemistry 2 project.
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30.33g of cs₂ and 39.91g of o₂ are mixed within a kiln to produce sulfu…
1. D. 1.702g 2. A. 9.58g
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5 multiple choice 10 points determine the mass percent of c in sodium b…
14.28% ### 6.
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to produce zinc metal, carbon monoxide reacts with zinc (ii) oxide acco…
For the first question: 360.8g For the second question: 22mol
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click to fix any capitalization errors below. click \submit answer\ if …
There are no capitalization errors.
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click to fix any capitalization errors below. click \submit answer\ if …
Expecting a dull lecture, Pua was thrilled to do a hands - on experiment in honors chemistry.
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1 numeric 10 points magnesium metal reacts with nitrogen gas to form ma…
1 2
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dandruff is __________. a a viral infection of the scalp b caused by ov…
D. a fungal infection of the scalp
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10 numeric 10 points 1.50 g of nitrogen monoxide react with 2.00 g of o…
$1.19\ g$
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wintergreen oil is produced in the following scheme from 6.84g of ch₃oh…
1. D. 32.5g 2. B. 239.1g
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17. use electron dot diagrams to represent the sharing of electrons in …
(a) For $H_2O$: O is central, with two H atoms bonded to it. O has 2 lone pairs. (b) For $O_2$: Two O atoms with a double - bond between them and 2 lone pairs on each O. (c) For $…
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multiple choice 10 points calcium carbide (cac₂) is prepared as per the…
$0.636\ lb$
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multiple choice 10 points: determine the mass percent of sulfur in caso…
D. 23.56%
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20. unknown element z exists as a diatomic molecule. in the molecule, t…
(a) Non - metal (b) On the right side of the periodic table. Non - metals form covalent bonds and diatomic molecules to gain stability, and elements with such properties are typic…
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a compound contains 24.9g of iron (fe) and it weighs 80.0g. assuming th…
1. C. 179g/mol 2. B. 11.7g
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20. unknown element z exists as a diatomic molecule. in the molecule, t…
(a) Non - metal (b) Group 17 (halogens) of the periodic table. Non - metals with 7 valence electrons form single covalent bonds in diatomic molecules to complete their octet.
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1 numeric 10 points iron metal reacts with chlorine gas to form iron (i…
1
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determine the number of protons in an isotope with 15 neutrons and with…
34
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how many electrons are there in 10x+? take the number of neutrons to be…
2
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how many protons are there in the isotope represented herein: $_{31}^{5…
B. 31
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multiple choice 10 points an unknown compound is found to have the foll…
17.28
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5 multiple choice 10 points provide the chemical formula for sodium chl…
D. $NaClO_3$
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3 multiple choice 10 points supply the name for fe(oh)2 iron (i) hydrox…
3. B. iron (II) hydroxide 4. D. sodium oxide
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1 multiple choice 10 points supply the name for pcl5 phosphorus (i) chl…
1. C. phosphorus pentachloride 2. B. KCl
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matching 10 points match the following synonyms. atom solution molecule…
None of the provided options (4.50 L and 0.0116 L) are correct. The correct volume is approximately 29.0 L. For the matching part:
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vocabulary practice: fill in the blank use the vocabulary words above t…
1. sentient 2. alchemy 3. recoil 4. sinister 5. sanctuary 6. prophetic
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6 matching 10 points match the following with the correct form of matte…
- mirky water: heterogeneous mixture - brass: homogeneous mixture - iron: element - pure DI water: compound
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an american scientist reports the density of a metal to be 0.94000 $\fr…
1. C. 26,019 2. 5
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11. what property of water molecules allows water to dissolve many subs…
11. Polarity. 12. A solute is the dissolved substance, a solvent is the dissolving substance. Example: In salt - water solution, salt is the solute and water is the solvent.
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which three elements are found in every carbohydrate? oxygen hydrogen c…
Oxygen, Hydrogen, Carbon