Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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here are sketches of four electron orbitals: a b c d are any of them s …
- For "List the s orbitals, if any.": A, D - For "List the p orbitals, if any.": B, C
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aluminum and oxygen express your answer as a chemical formula. a chemic…
$\ce{Al_{2}O_{3}}$
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employees must be trained on now to clean and sanitize properly. arrang…
1. Remove any loose material by wiping and/or scraping. 2. Place items in or under heated, soapy water to remove the rest of the material. 3. Rinse the item under clean water to r…
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1) calculate the number of valence electrons in formaldehyde, ch₂o. val…
12
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1) calculate the number of valence electrons in hydrogen cyanide, hcn. …
10
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what is abnormal about phosphoruss valence shell? justify phosphoruss v…
Phosphorus can expand its valence shell (accommodate > 8 electrons) because it has empty 3d orbitals (electron config: $1s^2 2s^2 2p^6 3s^2 3p^3$; valence shell n = 3 has 3d orbit…
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problem: dna is a giant molecule that contains covalent bonds. the gian…
The abnormality about phosphorus's valence shell is that it is expanding its octet (having more than 8 valence electrons). Justification: Phosphorus is in the third period of the …
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b. write the half - reactions for the reaction. label the oxidation rea…
Oxidation reaction: $\ce{Cu -> Cu^{2+} + 2e^-}$ (Cu loses electrons, oxidation state increases from 0 to +2) Reduction reaction: $\ce{NO_3^- + 4H^+ + 3e^- -> NO + 2H_2O}$ (N gains…
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oxidation state of n in reactant: +5 in product:+2 oxidation state of o…
Oxidation reaction (loss of electrons, increase in oxidation state): $Cu ightarrow Cu^{2+}+2e^-$ Reduction reaction (gain of electrons, decrease in oxidation state): $NO_3^- + 4H^…
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1) calculate the number of valence electrons in water, h₂o. valence ele…
8
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1) calculate the number of valence electrons in nitrogen trichloride, n…
26
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1) calculate the number of valence electrons in methylene chloride, ch₂…
20
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question 3 1 pts the energy yield of a reaction can be determined by ca…
the change in free energy ($\Delta G$).
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enter the formula for the compound that forms from calcium and hydroxid…
\( \text{Ca(OH)}_2 \)
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it takes 498. kj/mol to break an oxygen - oxygen double bond. calculate…
\( 240 \, \text{nm} \) (or \( 2.40 \times 10^{-7} \, \text{m} \))
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how many valence electrons are in the bicarbonate ion hco₃⁻?
24
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wine goes bad soon after opening because the ethanol (ch₃ch₂oh) in it r…
\(1.8\) g
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employees must be trained on how to clean and sanitize properly. arrang…
1. Remove any loose material by wiping and/or scraping. 2. Place items in or under heated, soapy water to remove the rest of the material. 3. Rinse the item under clean water to r…
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a 22.0 g sample of brass, which has a specific heat capacity of 0.375 j…
\(84.2\)
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which shows the electron configuration for silicon (si)? ar4s²3d¹⁰4p⁴ a…
\([Ne]3s^{2}3p^{2}\) (the fourth option in the list, with the label corresponding to \([Ne]3s^{2}3p^{2}\))
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which of the following observations would indicate that a material is a…
It cannot be physically broken down into different types of atoms.
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use the lines to answer the question. i am all alone in the house to - …
A. abba
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consider these elements: n, mg, o, f, al. a. write the ground - state e…
s: ## Part (a) - N: \(\boldsymbol{1s^22s^22p^3}\) - Mg: \(\boldsymbol{1s^22s^22p^63s^2}\) - O: \(\boldsymbol{1s^22s^22p^4}\) - F: \(\boldsymbol{1s^22s^22p^5}\) - Al: \(\boldsymbol…
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label the parts of an atom on the diagram below. 1. 2. 3.
1. Proton 2. Neutron 3. Electron
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name the compound hc₂h₃o₂(aq). acetic acid hydroacetic acid acetous aci…
A. acetic acid
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name the compound albr₃. aluminum tribromide aluminum(iii) bromide alum…
C. aluminum bromide
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part a what is the difference between a common name for a compound and …
The systematic name provides the reader with enough information that the formula of the compound can be determined. The common name is just like a nickname for the compound. (Assu…
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81. bromine is a highly reactive liquid, while krypton is an inert gas.…
Bromine has 7 valence electrons (electron config: $[Ar] 3d^{10} 4s^{2} 4p^{5}$), so it reacts to gain 1 electron for a stable octet. Krypton has a full valence shell (8 electrons,…
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missed this? watch iwe: writing formulas for ionic compounds; read sect…
B. \( \text{MgCl}_2 \)
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75. write a balanced chemical equation for the reaction of solid stront…
$\text{Sr}(s) + \text{I}_2(g) ightarrow \text{SrI}_2(s)$
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name: pd: chemistry u3l14_o2 ct module day 3 hw the photoelectron spect…
s: (a) The unknown element is sulfur (S). Its electron configuration is \(\boldsymbol{1s^2 2s^2 2p^6 3s^2 3p^4}\). (b) The 1s peak of the element (chlorine, Cl) to the right of su…
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beryllium and iodine express your answer as a chemical formula. a chemi…
\( \text{BeI}_2 \)
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aluminum and oxygen express your answer as a chemical formula.
\(\text{Al}_2\text{O}_3\)
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18. the atomic radii of the elements in the nitrogen group in the perio…
C ### Question 19
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name:______ pd:______ chemistry u3l14_q2 ct module day 3 hw *16. the ma…
D. The atomic mass of X is between 90 and 92. ### Question 17
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aluminum and oxygen express your answer as a chemical formula. a chemic…
$\ce{Al_{2}O_{3}}$
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what polyatomic ions have a 3 - charge? check all that apply. □ acetate…
phosphate (the checkbox next to "phosphate" should be checked)
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what polyatomic ions have a 2 - charge? check all that apply. carbonate…
A. carbonate, D. chromate, E. sulfite
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group 1a group 2a group 3a group 4a al li na ca k sr mg cs ba rb
To solve this, we need to classify the elements into their respective groups (1A, 2A, 3A, 4A) based on their group in the periodic table. ### Group 1A (Alkali Metals): Elements in…
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select the metals that form only one type of ion (that is, metals whose…
A. Na B. Ca C. K D. Ba E. Cs F. Mg G. Rb H. Sr I. Al J. Li
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what is the formula of the ionic compound that forms from gallium and c…
C. \(GaCl_3\)
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part a which element is a molecular element? krypton sodium copper chlo…
D. chlorine
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which elements have molecules as their basic units? check all that appl…
B. oxygen, C. bromine
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what is the difference between an ionic compound and a molecular compou…
The correct option is the one stating: "In ionic compounds the atoms (or group of atoms) exist as ions and are held together by electrostatic forces. In molecular compounds the at…
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which of the following is an example of an ionic compound? view availab…
D. sodium chloride
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9. which of the following is the ground - state electron configuration …
B. \(1s^{2}2s^{2}2p^{6}\) ### Question 10
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provide feedback submit single atoms diatomic molecules molecules formu…
- Single atoms: Cobalt, Ag, Xenon - Diatomic molecules: \( F_2 \), Nitrogen, Bromine - Molecules: \( SO_2 \), \( C_2H_4 \) - Formula units: \( Ca(OH)_2 \), \( KMnO_4 \), \( CdCl_2…
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name: pd: chemistry u3l14_q2 ct module day 3 hw **7. the complete photo…
B. Peak X, because 1s electrons have the strongest attractions to the nucleus. ### Question 8
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classify the substances as atomic elements, molecular elements, molecul…
- Atomic elements: Au, Cd - Molecular elements: \( F_2 \), \( H_2 \) - Molecular compounds: \( NO_2 \), \( HI \) - Ionic compounds: \( MgCl_2 \), \( NaCl \)
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name: pd: chemistry u3l14_q2 ct module day 3 hw 4. the decrease in the …
C ### Question 5
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name: pd: chemistry usl14 q2 ct module day 3 hw note: annotate all ques…
B. \( \text{Sr}^{2+} \) ### Question 2
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question 19 (5 points) listen whats the general formula for an alkene i…
D. $C_{n}H_{2n}$
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the melting of ice is considered a/an ______ because the ice absorbs he…
C. endothermic process
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question 15 (5 points) listen an element that emits energy by nuclear d…
A) radioactive
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question 14 (5 points) listen given that the enthalpy of reaction for a…
B) -358 kJ
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question 12 (5 points) listen when a reaction takes place at constant p…
C) enthalpy of reaction.
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question 11 (5 points) listen an atom that emits energy because of nucl…
A) radioactive.
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question 8 (5 points) listen whats the general formula for an alkane if…
A) \(C_{n}H_{2n+2}\)
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question 7 (5 points) listen adenine (a) thymine (t) the dotted lines b…
C) Hydrogen bonding
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question 20 (5 points) whats the molality of a solution with 120 g of n…
D) 0.068
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question 19 (5 points) which of the following is not part of the proper…
C) Storing acids and bases below \(10^\circ\text{C}\)
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question 18 (5 points) listen the most common use of the ammonia manufa…
D) fertilizers for crops
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question 17 (5 points) steve is performing a titration, where a base is…
B) A chemical that’s clear when basic and turns color when acidic
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question 16 (5 points) listen the use of water in a heat exchanger is t…
D) high specific heat
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question 15 (5 points) how many moles of naoh is needed to neutralize 4…
D) 0.027
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question 13 (5 points) which of the following will conduct electricity?…
D. Acid solutions and base solutions
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zinc is used as a coating for steel to protect the steel from environme…
A) 3.17 g of Zn
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question 10 (5 points) which of the following is an unusual property of…
A) It's a polar molecule.
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question 9 (5 points) listen antacids are a) strong bases. b) weak base…
B. weak bases
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question 8 (5 points) how many moles of a solute is present in 4.00 l o…
D) 33.2 mol
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question 7 (5 points) listen during the electrolysis of an aqueous solu…
D) Oxygen
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question 6 (5 points) listen why does an \acid spill kit\ often contain…
D. Baking soda is a weak base and will neutralize the acid.
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question 5 (5 points) which of the following goes through the largest v…
C) Water when it boils into steam
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a 0.100 m solution of naoh is used to titrate an hcl solution of unknow…
B) 0.191 M
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question 3 (5 points) listen cu+2 + 2e- → cu e° = 0.52 v ag+1 + 1e- → a…
C) 0.28 V
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chromium (iii) or chromium (vi) are frequently used to apply chrome fin…
A) 58.45 g
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question 1 (5 points) listen which term best describes cl in the follow…
D) Reduced
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question 20 (5 points) molar mass is reported on the periodic table in …
C. grams/mole
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question 19 (5 points) listen what kind of phase transition will occur …
A) Melting
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question 18 (5 points) listen a closed container holds 2.0 moles of co₂…
C) 2 moles
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question 17 (5 points) listen stoichiometry is based on a) conservation…
A) conservation of matter
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question 16 (5 points) whats the volume of one mole of an ideal gas at …
D) 22.4 L
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question 15 (5 points) listen the ideal gas law is a combination of all…
A) moles.
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question 14 (5 points) listen a piece of unknown metal weighs 500 g. wh…
C) 0.25 J/g°C
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question 13 (5 points) listen what property of gases confirms that the …
B) Compressibility
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question 12 (5 points) listen whats the empirical formula of a compound…
D) $PCl_3$
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question 11 (5 points) listen if the theoretical yield of a reaction is…
D) 126.4 g
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question 10 (5 points) listen 2nh₃→n₂ + 3h₂ if 2.22 moles of ammonia (n…
B) 3.33 moles of $\ce{H2}$
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question 9 (5 points) listen stoichiometry is the study of chemical rea…
D) counts
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question 8 (5 points) listen h₂ + br₂ → 2hbr if 2.23 g of hydrogen (h₂)…
A) 179 g of HBr
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question 7 (5 points) listen how many moles of carbon tetrachloride (cc…
C) 3.53 moles
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question 6 (5 points) listen a sample of gas at a fixed pressure has a …
D) 7 L
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question 5 (5 points) listen how many atoms are in 1.22 moles of magnes…
D) \( 7.35 \times 10^{23} \) atoms
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question 4 (5 points) listen one day in the chemistry lab students put …
D) Sublimation
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question 2 (5 points) listen how many joules must be added to a 1000 g …
B) 101,025 J
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question 1 (5 points) listen the subscripts in a chemical formula are t…
D) moles
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question 20 (5 points) listen an ionic compound contains a single metal…
C) Linear, polar
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question 19 (5 points) listen which of the following is the balanced ch…
B) $\ce{CH4 (g) + 2O2 (g) -> CO2 (g) + 2H2O (g)}$
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question 18 (5 points) listen a chemical reaction has the equation ( ma…
B) Double displacement
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question 17 (5 points) listen when nacl is dissolved in water, it separ…
D) (aq)