Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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question 7 (1 point) is this a chemical or a physical change? water tha…
B. Physical change
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question 6 (1 point) is this a chemical or a physical change? you combi…
b. Chemical change
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question 10 (1 point) is this a chemical or a physical change? when vin…
a. Chemical change
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question 5 (1 point) is this a chemical or a physical change? a iron na…
a. Chemical change
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choose one: oxidation reduction part 1 (2 points) + i₂(s) + 6h₂o(l) → 2…
Oxidation
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question 4 (1 point) is this a chemical or a physical change? hammering…
b. Physical change
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question 3 (1 point) is this a chemical or a physical change? a reactio…
a. Chemical change
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part 4 (2 points) choose one: oxidation reduction +i₂(s)+6h₂o(l)→2io₃⁻+…
Oxidation
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question 2 (1 point) is this a chemical or a physical change? burning a…
b. Chemical change
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question 1 (1 point) is this a chemical or a physical change? tearing a…
a. Physical change
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note that for each of the four reactions, one of the gray boxes will be…
Part 1: Oxidation, $\text{Fe}^{2+}(aq)\to\text{Fe}^{3+}(aq)+e^-$ Part 2: Reduction, $\text{AgI}(s)+e^-\to\text{Ag}(s)+\text{I}^-(aq)$ Part 3: Reduction, $\text{VO}_2^+(aq)+2\text{…
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identify this bunsen burner part: long metal tube where gas and air mix…
A. Barrel/Chimney
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bunsen burner safety how do you get a yellow flame? air hole open, gas …
Air hole closed, gas tap fully open
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bunsen burner safety the safety flame is the: blue flame yellow - orang…
Yellow-orange flame
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which of the following steps should be done first? open the gas tap con…
Put on your goggles
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bunsen burner safety the valve that adjusts the amount of air flow to t…
C. Collar
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bunsen burner safety which flame is hotter and forms when the air hole …
A. Non - luminous blue cone flame
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bunsen burner safety flexible tubing that connects the bunsen burner to…
B. Rubber hose
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bunsen burner safety identify this bunsen burner part: rotating piece t…
A. Collar
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bunsen burner safety why is the yellow flame called the safety flame? i…
It is cooler and easy to see
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13) calculate the percentage - by - mass of nitrogen in pb(no₃)₂ a)4.67…
D 15.
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bunsen burner safety most important safety question: what must you chec…
Air - hole is completely closed
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bunsen burner safety which flame makes the glassware dirty? blue flame …
Yellow flame
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identifying types of chemical reactions - swyk what type of reaction do…
combustion
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match the following reactions to the correct description 4fe + 3o₂ → 2f…
- $4Fe + 3O_{2} ightarrow2Fe_{2}O_{3}$: synthesis - $2H_{2}O ightarrow2H_{2}+O_{2}$: decomposition - $Mg + CuSO_{4} ightarrow MgSO_{4}+Cu$: single replacement - $HCl + NaOH ightar…
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chapter 2 retake version 3 1) which atom has the smallest number of neu…
1. B. nitrogen - 14 2. D. argon - 40 3. D. 54, 54, 78 4. B. neutrons 5. D. is definitely a non - metal 6. B. definitely a metal 7. C. similar chemical properties only 8. A. metal,…
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identifying types of chemical reactions - swyk synthesis ( combination …
False
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identifying types of chemical reactions - swyk the reactants in a combu…
False
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joseph louis gay - lussac (1778 - 1850) grew up during both the french …
1. Equal volumes of all gases expand equally with the same increase in temperature. 2. Charles's law
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which one of the following is a decomposition reaction? ch4(g) + o2(g) …
$\mathrm{CaCO}_{3}(s) ightarrow\mathrm{CaO}(s)+\mathrm{CO}_{2}(g)$ and $\mathrm{PbCO}_{3}(s) ightarrow\mathrm{PbO}(s)+\mathrm{CO}_{2}(g)$ are decomposition reactions.
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identifying types of chemical reactions - swyk which one of the followi…
$CaCO_3(s) ightarrow CaO(s)+CO_2(g)$ and $PbCO_3(s) ightarrow PbO(s)+CO_2(g)$
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05 question (3 points) a precipitation reaction involves the formation …
Part 1: $2NH_4C_2H_3O_2(aq)+K_2S(aq) ightarrow(NH_4)_2S(aq)+2KC_2H_3O_2(aq)$ Part 2: $2NH_4^+(aq)+2C_2H_3O_2^-(aq)+2K^+(aq)+S^{2 - }(aq) ightarrow2NH_4^+(aq)+S^{2 - }(aq)+2K^+(aq)…
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comparing poetry: poetic devices assignment active reflecting on fixed …
John Masefield's "Sea - Fever" has a fixed poetic structure with regular stanzas, consistent rhyme scheme, which gives it musicality and rhythm.
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1 why does a warm air mass generally contain more moisture than a cold …
1. Warmer air can hold more water - vapor due to higher energy of water - molecules. 2. Occluded 3. Fronts; transition zones 4. Cold
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construct the expression for ksp for solid bii₃ in aqueous solution. bi…
$K_{sp}=[Bi^{3 + }][I^{-}]^{3}$
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west virginia has a lot of mountains, as a result which industry could …
timber
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chapter 2 test version 3 1) elements in group 6a are known as the a) al…
1. **Answer - Question 1**: - # Brief Explanations: Elements in Group 6A are called chalcogens. Halogens are in Group 7A, alkali - metals in Group 1A, alkaline earth metals in Gro…
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the elements of the weather weather is the condition of the atmosphere …
1. temperature, winds, moisture, pressure 2. Weather 3. temperature 4. Heat 5. Temperature
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2) how much energy is required to decompose 755 mg of pcl₃, according t…
1.66 kJ
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3. identify different parts of the atom: 1. atom 2. ________ 3. _______…
2. Electron 3. Proton 4. Electron 5. Neutron 6. Electron shell
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4. fill in the table. subatomic particle charge mass location in atom
| Subatomic Particle | Charge | Mass | Location in atom | | ---- | ---- | ---- | ---- | | Proton | +1 | ~1 amu | Nucleus | | Neutron | 0 | ~1 amu | Nucleus | | Electron | - 1 | $\…
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13 multiple choice 1 point the smallest part and building block of matt…
13. D. atom 14. B. 8 electrons
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12 multiple answer 1 point physical changes describe changes in matter …
B. salt dissolving in water, C. water vapor condensing to form clouds, E. melting ice, F. Tearing paper, J. breaking a pencil in half, K. coloring paper in rainbow colors
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use the periodic table block to identify or calculate the information l…
Number of electrons: 35 Number of protons: 35 Number of neutrons: 45 Element Symbol: Br
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a b c d e fixed orbit / bohr model billiard ball model nuclear model el…
A. Billiard Ball Model B. Blueberry Muffin / Plum Pudding Model C. Nuclear Model D. Fixed Orbit / Bohr Model E. Electron Cloud Model
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study guide - atomic structure 1. how many elements in periodic table? …
1. 118 2. Protons, neutrons, electrons 3. Nucleus (protons and neutrons), electron - cloud (electrons)
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4 multiple choice 1 point what is the atomic number of the element show…
C. 35
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a solution is prepared by dissolving 5.00 g of potassium nitrate (kno₃)…
a. $0.309\ M$ b. $3.23\%$ c. $0.330\ m$ d. $0.0148$ e. $32258\ ppm$
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the arrow shown in the image above points to which type of subatomic pa…
Electron
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examine the atomic models below. which one of the models shown is the m…
D.
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6. an 8.65 g sample of an unknown group 2a metal hydroxide is dissolved…
a. The molar mass of the metal hydroxide is approximately $121.6\ g/mol$. b. The metal cation is $Sr^{2+}$.
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1. a container of oxygen has a volume of 20.0 ml and a pressure of 4.00…
$13.3$ mL
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problem 44 of 60 determine the number of valence electrons in pcl₃, pho…
26
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key management for children with amelia includes: a. prosthetic limb fi…
a. Prosthetic limb fitting and physiotherapy
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question 6 (1 point) the label ___ means at least 95 percent of a food …
A. organic
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complete the table below, using the diagram of an atom shown at right. …
| name | symbol | charge (in multiples of e) | approximate mass (amu) | location on diagram | | ---- | ---- | ---- | ---- | ---- | | neutron | $n$ | 0 | 1.0 | A | | proton | $p^+$…
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hypothesis: if a material undergoes a chemical change, then it will not…
color changes whether changes are easily reversible temperature changes formation of precipitates or gases
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write the chemical symbols for three different atoms or atomic anions w…
$Br$, $Se^-$, $As^{2 - }$
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write the chemical symbols for three different atoms or atomic cations …
Na, $Mg^{+}$, $Al^{2+}$
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question 28 (2 points) which is a reasonable description for metallic b…
electrons are shared widely among bonded atoms
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question 16 (2 points) sylvite is kcl, where each k is coordinated with…
Octahedron
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question 12 (2 points) the radius ratio range for cubic coordination is…
C. 0.732 - 1.0 (similar but smaller cation to anion)
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question 10 (2 points) which has an ionic potential less than 10 nm -1 …
K
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question 31 salts in solution separate into positively and negatively c…
D. ions
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when 10.0 g of barium chloride (bacl2) is dissolved in 102 g of water i…
$q_{H_2O}=0.853kJ$ $\Delta H^{\circ}=-0.853kJ$
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a sample of solid isophthalic acid (c8h6o4) that weighs 1.067 g is burn…
(a) $2C_8H_6O_4(s)+15O_2(g) ightarrow16CO_2(g)+6H_2O(l)$ (b) $5810.6\ kJ/mol$ (c) $-380.2\ kJ/mol$
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the standard enthalpy change of combustion to co2(g) and h2o(l) at 25°c…
$-773.03$ kJ/mol
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use the references to access important values if needed for this questi…
a. $\Delta H^{\circ}=23.7\ kJ/mol$ b. To find the temperature change, we first need to find the heat absorbed by the solution. The number of moles of $K_{2}SO_{4}$, $n=\frac{m}{M}…
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given the standard enthalpy changes for the following two reactions: (1…
$148.9\ kJ$
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a student determines the heat of dissolution of solid calcium bromide u…
$108.2$
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a student determines the heat of dissolution of solid calcium bromide u…
$110.5$
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the standard enthalpy change for the following reaction is -265 kj at 2…
\(265\)
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the reaction of carbon dioxide with hydrogen to form carbon monoxide an…
41.2
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the reaction of tetraphosphorus decaoxide with water to form phosphoric…
- 453
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using the standard formation enthalpies that follow, calculate the stan…
$-368.6$
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select sucrose from the list of compounds and adjust the mass of the co…
$2.87^{\circ}C$
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lesions that are commonly referred to as amygdala lesions often none of…
1. damage neural structures other than the amygdala and do not destroy the entire amygdala. 2. immunocytochemistry and in situ hybridization
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in the laboratory a \coffee cup\ calorimeter, or constant pressure calo…
$0.463$
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7. the new basic school curriculum is standard - based. which one of th…
7. B. Learners demonstrate understanding and mastery of knowledge and skills through a standard examination. 8. D. Remove the element of cost as a hindrance to educational access.…
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our minimal pest control process involves ____________. select all that…
Ensuring good airflow by using the environmental control features, Proper watering to prevent infestations, Inspecting all live goods coming into our Stores, Spraying liberally wi…
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calculate the mass of h2 required to react with 98.0 g of this triglyce…
$0.74\ g$
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atomic structure & isotope worksheet 1. the mass of an atom is containe…
1. protons; neutrons 2. protons 3. protons 4. protons and electrons 5. c) nucleus 6. d) ion 7. b) neutral atom 8. b) different number of neutrons 9. c) carbon - 14 10. | Protons |…
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**1. label the parts of an atom in the diagram below a) what type of ch…
1. a) Positive charge b) No charge c) Negative charge d) Protons and neutrons 2. Carbon: #P = 6, #N = 6, #E = 6 Neon: #P = 10, #N = 10, #E = 10 Potassium: #P = 19, #N = 20, #E = 1…
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① identify the each of the parts of the box and fill in the blank. atom…
Atomic number = 8 Atomic mass = 15.999 # of protons = 8 # of electrons = 8 # of neutrons = 8 ## Step1: Recall titanium's atomic number Titanium (Ti) has an atomic number of 22. Th…
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q1 chemistry u2l17.5 unit 2 mini review 2. write the preferred charges …
| Element | Preferred charge | Total number of electrons | |---|---|---| | Na | +1 | 10 | | Mg | +2 | 10 | | F | - 1 | 10 | | N | - 3 | 10 | | Li | +1 | 2 | | Sublevel | # of orbi…
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name: ______________ teacher: ______________ q1 chemistry: u2l17.5 unit…
# Explanation: ## Step1: Determine electron - configuration rules Use Aufbau principle, Pauli - exclusion principle and Hund's rule. ## Step2: Find electron number of oxygen (O) O…
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1 chemistry: u2l11 electron configu- b. *electrons will occupy a p - or…
- b. ii. the previous s - orbital is completely full - c. iii. all of the orbitals - 9. opposite spins - 10a. ii. All orbitals in the same sublevel have one electron - 10b. i. The…
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q1 chemistry u2l11 electron configuration day 1 prep - work part 1: ele…
Magnesium: Electron - configuration: $1s^{2}2s^{2}2p^{6}3s^{2}$, Orbital - energy level diagram: 1s (2 paired electrons), 2s (2 paired electrons), 2p (3 pairs of electrons), 3s (2…
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practice it! all of the following are correct about weathering and eros…
Beach erosion usually takes thousands or millions of years.
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read this prompt: create a multimedia presentation about the risk to fa…
B. a chart showing how commonly used chemicals negatively affect farmers' health
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question 13 of 26 how did advancements in technology help bring a quick…
D. The United States' use of atomic bombs forced Japan into immediate surrender.
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multiple choice question what is brownian movement? the movement of bro…
The constant motion of molecules
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the figure below shows student bs results for coarse manganese dioxide …
$0.545\ cm^3/s$
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some students investigated the rate of decomposition of hydrogen peroxi…
(a) a glowing splint (b) Take more measurements at regular intervals and repeat the whole experiment multiple times. (c) Use a more precise gas - measuring device, control tempera…
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q2. manganese dioxide catalyses the decomposition of hydrogen peroxide …
(a) Manganese dioxide provides an alternative reaction pathway with lower activation energy, increasing the number of reacting molecules and the reaction rate. (f) Fine manganese …
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q2. manganese dioxide catalyses the decomposition of hydrogen peroxide …
(a) A catalyst (manganese dioxide) provides an alternative reaction pathway with lower activation energy, increasing the fraction of hydrogen - peroxide molecules with sufficient …
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q2. manganese dioxide catalyses the decomposition of hydrogen peroxide …
5.6 cm³/s
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4. why should you avoid popping blisters caused by burns? it can lead t…
4. It can lead to infection. 5. When the burn covers a large - area, is on sensitive areas (like the face), or shows signs of infection. 6. Contact with cleaning products or indus…
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18 minutes remaining. page 11 of 13. question 11. match the digestive t…
1. Wavelike muscle contractions to move food. 2. Breakdown of fats by bile. 3. Nutrients enter the bloodstream. 4. Mechanical and chemical breakdown of food.
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1. the physical and chemical breakdown of foods is known as: defecation…
C. Digestion