Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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testing for ph levels can be useful in a variety of ways. healthcare pr…
Hydrogen ions ($H^+$)
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1. if a solution has equal numbers of hydronium and hydroxide ions, wha…
C. 7
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classify each of the following as a physical property or as a chemical …
Blue color: Physical property Density: Physical property Combustibility: Chemical property Boiling point: Physical property Reacts with acid: Chemical property
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determining components of a mixture a chemist mixes a 10% hydrogen pero…
20
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question 4 of 10 why would a lack of neurotransmitters change the funct…
D. Signals travel from neuron to neuron through neurotransmitters.
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section 24.2 radioactive decay in your textbook, read about the changes…
1. a. much less 2. b. 1:1 3. d. neutron 4. d. $^{29}_{14}Si$ 5. c. 20 6. a. 234 7. b. proton 8. a. neutron 9. d. $^{238}_{92}U$ 10. c. $^{150}_{64}Gd$ 11. b. 1.1:1 12. a. $^{4}_{2…
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draw the lewis dot structures for the following (1*5=5 points). show co…
a) For C₂H₄: H are single - bonded to C and there is a C = C double - bond. b) For PO₄³⁻: P is at the center with single - bonded O atoms and lone - pairs on O. c) For CaCl₂: Ca²⁺…
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which of the following lewis symbols is correct? li· ·ge· ·n· ·sb· a b …
a. a.a d. d.MgF2 c. c.NO
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which of the following shows the correct charge distribution in ocs? a.…
d.d ### Question 16
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question 10 which of the following is an ionic compound? d.c3h8 a.co2 c…
Question 10: C. CaO Question 11: A. 8 Question 12: B. lose one electron
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how many moles of ammonia are there in a 346 g sample of pure nh3? o c.…
c. 20.3 mol
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an ionic compound is formed between d. a non - metallic cation and a me…
- Question 1: b. a metallic cation and a non - metallic anion - Question 2: b. $LiNO_3$, $LiNO_2$ - Question 3: a. to show the charge of the metal cation - Question 4: $SrI_2$
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predominant 6 potential points love and loss are predominant themes in …
Love and loss are predominant themes in the author's short stories. Cinnamon and nutmeg are predominant flavors in the spice mixture.
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the protons are generated during oxidation reactions. true or false
True
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when oxygen accepts electrons, water is produced as a byproduct. true o…
True
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part 1 of 2 which is the more stable isomer? select the single best ans…
Part 1 of 2: trans - 1 - ethyl - 4 - methylcyclohexane Part 2 of 2: trans is more stable than cis in 1,4 - disubstituted cyclohexanes because both substituents are equatorial
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what is used to make glass? 1. salt 2. sand 3. clay 4. coal
2. Sand
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brian tutors chemistry. for each hour that he tutors, he earns 40 dolla…
120
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a student proposes the following lewis structure for the phosgene (cocl…
| atom | formal charge | | ---- | ---- | | C | 0 | | O | 0 | | right Cl | 0 | | left Cl | 0 |
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a is made up of atoms that are chemically combined in like nacl or h₂o.…
A. compound B. definite proportion C. covalent bond D. molecule
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question 1 describe the doppler effect it is the change in wavelength o…
Question 1: It is the change in wavelength of radiation due to relative motion of the source with respect to the observer Question 2: It is a planetary model of the atom but where…
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research that links antisocial behavior to a persons brain chemistry, b…
Question 4: C. Neurological dysfunction Question 5: A. True
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what is the chemical that refluxes into the esophagus, causing the burn…
Hydrochloric acid (HCl)
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my first thought is dad is going to kill me. ive never failed anything …
C. Character vs. Self
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12 through the process of ______ oxygen, iron, and water combine to for…
A. oxidation
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10 chemical weathering breaks down rock by causing chemical changes tha…
True
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10 chemical weathering breaks down rock by causing chemical changes tha…
True
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fill in the name and empirical formula of each ionic compound that coul…
| Cation | Anion | Empirical Formula | Name of Compound | | ---- | ---- | ---- | ---- | | Sodium ion ($\text{Na}^+$) | Hydroxide ion ($\text{OH}^-$) | $\text{NaOH}$ | Sodium hydro…
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complete the table below by writing the symbols for the cation and anio…
| Ionic compound | Cation | Anion | | ---- | ---- | ---- | | $(NH_4)_2O$ | $NH_4^+$ | $O^{2 -}$ | | $Cr_2(CO_3)_3$ | $Cr^{3+}$ | $CO_3^{2 -}$ | | $Mn(NO_3)_3$ | $Mn^{3+}$ | $NO_3^…
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chemical control of respiration is directly dependent upon the level of…
d. Carbon dioxide
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nuclear chemistry section 24.1 nuclear radiation in your textbook, read…
(2) radiation (3) radioactivity (4) radioactive decay (6) gamma ray (7) alpha particle (8) beta particles (9) X - ray (10) gamma ray (11) 0 (12) Ernest Rutherford (13) + 2 (14) - …
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air is a solution of gases. it is composed of 1% water vapor, 0.04% car…
A. nitrogen
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suppose you add solute molecules that are highly concentrated to water …
The solute concentration will be the same everywhere.
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imagine you have solute molecules at a very high concentration at a spe…
Solute molecules will spread out evenly reaching equilibrium.
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a solution is a mixture of a multiple choice solute dissolved in a solv…
solute dissolved in a solvent.
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which dye would you predict to move the fastest (and thus go furthest i…
potassium permanganate (mw = 158 g/mol)
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two solutions are made by mixing sugar and enough water to make a 1 lit…
the 10% sugar solution
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what drives diffusion? multiple choice chemical reactions within the so…
the random movement of molecules
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imagine that you have been assigned five substances for which you will …
Substance #4 will diffuse farthest because the molecular weight is least.
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when looking at your data from the effect of concentration on the rate …
the rate of diffusion decreased for all three concentrations of potassium permanganate crystals
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question 49 2 pts a _______ is intended to be an ideal organization dya…
Question 49: C. bureaucracy Question 50: B. mechanical; organic
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count the atoms! f₃no₂s
7
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count the atoms! 3fe(oh)₃
21
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count the atoms! f3no2s
7
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count the atoms! ch₃coona
8
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count the atoms! c₈h₁₈
26
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count the atoms! c₈h₁₈
26
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physical hazard classes represent hazards relating to physical and chem…
True
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count the atoms! hg(oh)2
5
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the two hazard classes adopted by whmis are: (select all that apply) da…
C. Health Hazard, D. Physical Hazard
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ghs covers all hazardous chemicals and may be adopted to cover chemical…
True
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count the atoms! 6hnco
24
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count the atoms! ga(clo4)3
16
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count the atoms! 5basi₂o₅
40
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count the atoms! ch₃coona
8
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review the information in this chapter by answering the following quest…
1. Ethanol 2. Different drinks have different alcohol concentrations. 3. Body weight 4. Slows alcohol absorption 5. For men, 5 or more drinks in about 2 hours; for women, 4 or mor…
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two types of restraints are: physical and chemical true false
True
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density involves the amount of a material in a certain volume. when a m…
The liquid state is more dense than the solid state.
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golds natural state has a definite shape and a definite volume. what is…
solid
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michael has a substance that he puts in container 1. the substance has …
gas
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mercurys natural state is where the atoms are close to each other but a…
B. liquid
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47. the amount of carbon - 14 in ancient artifacts and fossils is often…
Number of protons: 6, Number of neutrons: 8, Symbol: \(_6^{14}C\)
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determine the number of protons and neutrons in each isotope. a. $_{7}^…
Number of protons: 7 Number of neutrons: 7
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numeric 2 points. the initial volume reading is 2.0 ml. after adding a …
# Explicación: ## Paso 1: Calcular el volumen del material El volumen del material es igual al volumen final menos el volumen inicial. $V = V_{final}-V_{inicial}=9.2\ mL - 2.0\ mL…
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calculate the volume of a material if its mass is 31.4 g and its densit…
7.72 mL
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numeric 2 points an empty evaporating dish weighs 20.0 g. the dish with…
# Explicación: ## Paso 1: Calcular la masa del polvo La masa del polvo se obtiene restando la masa del plato evaporador vacío de la masa del plato evaporador con el polvo. $m = 26…
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pat is normally very restless and fidgety, whereas shelley is usually q…
3) temperament.
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task one for each of the following, explain whether or not you think th…
1. Y. The reasoning is logical using deductive logic. 2. N. The initial premise is false. 3. Y. Valid analogy for reasoning. 4. Y. Uses factual evidence for reasoning. 5. N. Commi…
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frans avoids talking with food in his mouth because other people think …
1. 4) norms 2. None of the provided options are correct. Personal space refers to the physical distance people like to maintain around themselves.
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1. where are the most active metals located? 2. where are the most acti…
1. Lower - left part of the periodic table (Group 1 and 2 towards the bottom). 2. Upper - right part of the periodic table (Group 17). 3. Decreases; due to increased nuclear charg…
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12 another name for thermal energy is ________. molecules in motion tem…
heat
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2. how can stoichiometry principles be applied to analyze and interpret…
Stoichiometry principles are applied by using mole - ratios from balanced chemical equations to predict reactant and product amounts in chemical reactions, as illustrated by combu…
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1. why is optimizing chemical reaction processes important in various f…
Optimizing chemical reaction processes is important for efficiency, cost - reduction, and waste minimization. Stoichiometry contributes by providing quantitative relationships to …
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a solid is weighed on the balance using the following steps: 1. the bal…
$0.444$
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what can a person do to limit exposure to x - rays? wear sunblock avoid…
wear a protective lead vest
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which properties of water contribute to the formation of the meniscus? …
C. cohesion, D. adhesion
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8.) find the molar mass of ca₃(po₄)₂. (3 points)
310.18 g/mol
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the use of percent yield calculations to assess efficiency.
Percent yield calculations are used to compare actual and theoretical yields, thus assessing the efficiency of a chemical process.
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how you would apply stoichiometry principles to calculate theoretical y…
Follow the above four - step process to calculate the theoretical yield using stoichiometry principles.
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directions: solve each of the following problems 7 - 12 as directed. sh…
\(\mathbf{208.23\ g/mol}\)
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30 multiple choice 2 points species with unpaired electrons are called …
A. radicals
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29 multiple choice 2 points in the first propagation step of the free r…
E. A chlorine radical abstracts a hydrogen.
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directions: solve each of the following problems 7 - 12 as directed. sh…
$\mathbf{208.23\ g/mol}$ ### 8.
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28 multiple choice 2 points ____ is the study of reaction rates. termin…
D. kinetics
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27 multiple choice 2 points energy is ______ when bonds are formed and …
B. released; consumed; endothermic
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26 multiple choice 2 points what term describes the highest - energy st…
D. transition state
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6.) determine the number of atoms in each formula: al₂(so₄)₃ (3 points)…
Al: 2 S: 3 O: 12
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25 multiple choice 2 points which is a measure of the randomness of a s…
E. entropy
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provide the value of the standard enthalpy change (δh°) for the followi…
$\Delta H^{\circ}=18\ kJ/mol$
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3.) it is possible to convert moles to particles by (1 point) dividing …
3. multiplying by $6.02\times 10^{23}$ 4. False 5. False
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23 multiple choice 2 points the difference in energy between reactants …
B. activation energy
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directions: choose the answer that best completes each statement for nu…
1. C. mass of each element in the compound 2. D. Avogadro's number
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22 multiple choice 2 points if stronger bonds are formed and weaker bon…
C. exothermic
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21 multiple choice 2 points which of the following radicals is the most…
Quaternary radical
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20 multiple choice 2 points which of the following statements correctly…
The entropy term makes a greater contribution to $\Delta G^{\circ}$ at high temperatures.
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multiple choice 2 points the heat released or absorbed during a chemica…
A. Enthalpy
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consider the reaction diagram shown below. a. determine which step in t…
a. First step (A-->B) b. Proceed to form the product c. First step (A-->B)
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17 multiple choice 2 points if a reaction is exothermic, then _____. δs…
D. $\Delta H^{\circ}<0$
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multiple choice 2 points provide an energy profile diagram for an exoth…
The first diagram is correct.
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multiple choice 2 points ______ is the minimum kinetic energy reacting …
activation energy