Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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chemistry sem 1 2.3.2 quiz: organization and history of the periodic ta…
B. 2
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question 9 of 10 how have chemists changed the periodic table over time…
B. They have added new elements to the table.
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chemistry sem 1 ↑ 2.3.2 quiz: organization and history of the periodic …
A. 14
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question 7 of 10 how many valence electrons does b (boron) have? a. 5 b…
B. 3
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question 6 of 10 what arerepresentative elements? a. elements in the sa…
D. Elements in the tall columns of the periodic table
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question 5 of 10 how does the periodic table indicate the number of val…
D. By the group number of the A columns
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question 4 of 10 how did mendeleev arrange the known elements in his pe…
B. According to atomic mass
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question 3 of 10 what do all the elements in one row of the periodic ta…
D. They all have the same number of core electrons
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question 2 of 10 which electrons are the valence electrons of the atom?…
A. The electrons farthest away from the nucleus
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question 1 of 10 why do all the elements in group 16 share similar prop…
A. They all have the same number of valence electrons.
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question 10 of 10 what is an isotope? a. atoms of the same element that…
C. Atoms of the same element that differ in number of neutrons
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question 9 of 10 what charge does an ion have if it has more protons th…
B. A net positive charge
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question 8 of 10 what did the periodic table help scientists discover? …
B. Elements not yet known to exist
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post - test activity please answer the following questions in a one who…
1. - $C_{12}H_{22}O_{11}$: $342.34\ g/mol$ - $C_7H_{16}$: $100.23\ g/mol$ - $C_{14}H_{18}N_2O_5$: $294.34\ g/mol$ - $(NH_4)_2SO_4$: $132.17\ g/mol$ 2. - Oranges: $6.022\times 10^{…
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question 7 of 10 an atom of copper (cu) has a mass number of 63 and an …
A. 29
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question 6 of 10 how is each element represented in the periodic table?…
D. Each element is represented by a one or two - letter symbol.
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directions: read the text properties of matter and then answer the ques…
1. Physical property: A characteristic of a substance that can be observed or measured without changing the identity of the substance. Chemical property: A characteristic of a sub…
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question 5 of 10 what does the number above the symbol represent? a. th…
C. The atomic number
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question 4 of 10 potassium (k) has an atomic number of 19. it often for…
C. 18
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question 3 of 10 what does the number below each elements symbol repres…
D. The average atomic mass
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question 2 of 10 how many elements occur naturally? a. 6 b. 25 c. 90 d.…
C. 90
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question 1 of 10 na - 23 has 12 neutrons. what is its atomic number? a.…
A. 11
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click on the element in the periodic table to explore the atomic radii …
A = 1.14 B = 1.30 C = 1.54
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1. which of the following is a base si unit? a) liter b) kelvin c) gram…
1. b) Kelvin 2. b) Cubic meter (m³) 3. b) kg/m³ 4. c) Graduated cylinder 5. c) Mass ÷ Volume 6. b) 45 cm³ 7. b) Float 8. b) Mole 9. c) Liter 10. b) Water displacement
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complete the text with the best transition. recycling electronics is im…
In particular
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3. what is the relationship between an elements isotopes and the elemen…
3. The element's atomic mass is a weighted - average of the masses of its isotopes based on their relative abundances. 4. A weighted average is an average that considers the weigh…
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question 9 (1 point) which of the choices is a subscript in 5h₂cl? a 5 …
Question 9: B. 2 Question 10: A. 5
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sublimation is when a solid gains energy and becomes a gas, skipping th…
They gain energy.
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how many atoms of chlorine are there in 4hcl? o a 3 o b 100 o c 4 o d 2…
For the first question: C. 4 For the second question: D. 8
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sublimation is when a solid gains energy and becomes a gas, skipping th…
The particles move so fast that they change into a gas.
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how many atoms of carbon are in cellulose, c6h7o2(oh)3? a 7 b 4 c 2 d 6…
For the number of carbon atoms: d. 6 For the number of hydrogen atoms: b. 10
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sublimation is when a solid gains energy and becomes a gas, skipping th…
Sublimation
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sublimation is when a solid gains energy and becomes a gas, skipping th…
It is when a solid becomes a gas.
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choose the correct answer. which of these best describes sublimation? c…
changing from a solid to a gas
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cellulose = c₆h₇o₂(oh)3 how many elements are present in the formula? q…
First question: f. 3 Second question: d. 2
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cellulose = c₆h₇o₂(oh)3 how many molecules are present in the formula? …
Question 1: e. 1 Question 2: e. 4
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question 10 (1 point) if 115g of a substance reacts with 84g of another…
199
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question 8 (1 point) hydrogen and oxygen react chemically to form water…
38.25 18
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question 7 (1 point) hcl + naoh --> h₂o + nacl 2.87g + ____g 3.75g + 1.…
a. 2.86 ### Question 8
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condensation is when a gas loses energy and becomes a liquid. when a ga…
Droplets forming on a window after a hot shower
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condensation is when a gas loses energy and becomes a liquid. when a ga…
C. Condensation
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read the excerpt from ovids \pyramus and thisbe\. the blood leaped high…
The figurative language describes the violence of the scene.
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1. multiple choice 1 point when a mother walks into a room and sees tha…
1. verbal 2. situational
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complete the following statement about the earth system. matter is cont…
light waves
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66. as urban environments become denser, noise pollution is becoming a …
## Question 66: E ## Question 67: B ## Question 68: A
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8. what volume would 23.82 grams of mercury occupy? $\frac{23.82}{v}=13…
$1.75$ cm³
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this element is directly below the element that has 49 protons in its n…
Holmium (Ho), Moscovium (Mc), Selenium (Se), Ytterbium (Yb), Nihonium (Nh), Germanium (Ge), Flerovium (Fl), Gallium (Ga), Cesium (Cs), Indium (In), Arsenic (As), Radon (Rn), Tin (…
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this element is directly below the element that has 49 protons in its n…
1. Holmium (Ho) 2. Moscovium (Mc) 3. Selenium (Se) 4. Ytterbium (Yb) 5. Nihonium (Nh) 6. Germanium (Ge) 7. Flerovium (Fl) 8. Gallium (Ga) 9. Cesium (Cs) 10. Indium (In) 11. Arseni…
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this element is directly below the element that has 49 protons in its n…
Indium (In), Moscovium (Mc), Selenium (Se), Polonium (Po), Nihonium (Nh), Germanium (Ge), Flerovium (Fl), Gallium (Ga), Cesium (Cs), Arsenic (As), Radon (Rn), Tin (Sn)
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this element has one more proton than caesium (cs). this element has 8 …
1. Barium (Ba) 2. Oxygen (O) 3. Chlorine (Cl) 4. Astatine (At) 5. Bismuth (Bi) 6. Boron (B) 7. Phosphorus (P) 8. Aluminium (Al) 9. Nitrogen (N) 10. Silicon (Si) 11. Carbon (C) 12.…
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this element is directly below the element that has 56 protons. this el…
Radium (Ra), Carbon (C), Francium (Fr)
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the atomic number of this element is 82. this element is directly below…
Lead (Pb)
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this element has 1 less proton than polonium (po) in its nucleus. the a…
Lead (Pb)
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the small object in the picture is an artifact from anglo - saxon engla…
part of a ring
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this element is directly above the element with 13 protons. the atomic …
Based on the above - mentioned identifications for each statement: 1. Boron (B) 2. Phosphorus (P) 3. Magnesium (Mg) 4. Gallium (Ga) or Indium (In) 5. Aluminum (Al) 6. Chlorine (Cl…
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this element has 113 electrons surrounding its nucleus
Nihonium (Nh)
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clue this element has 9 more electrons than technetium (tc) this elemen…
Tl, Mc, At, Po, Ge, Al, Ga, Cs, C, Pb, Rn, Sn
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multiple select question select all that apply which of the following a…
A. fats B. minerals C. carbohydrates
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a substance causing a quicker reaction a prolonged period of time to ma…
| Term | Technical Meaning | |--|--| | enhelm | No common relevant meaning in given contexts | | parchment | A kind of paper made out of animal hide | | catalyst | A substance cau…
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question 7 pas encore répondu noté sur 1,00 selon le modèle atomique, l…
atomes, impossible
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question 5 quel est lunité de base de la matière? ○ a. atome ○ b. adn ○…
A. atome
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question 2 tous les atomes dun même élément sont _, ils ont les mêmes _…
identiques, caractéristiques
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question 1 il y a des atomes impliqués dans une odeur ○ a. faux ○ b. vr…
b. Vrai
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6) 2znso4 # of molecules: 2 # of elements: 3 name of element: zn=zinc s…
subscript
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9) na₂cro₄ # of molecules: 1 # of elements: 3 name of element: # of ato…
Name of element: Sodium, Chromium, Oxygen # of atoms: 2, 1, 4 Total # of atoms: 7 The #4 is a subscript.
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1. which state of matter are atoms moving the slowest? a. solid b. liqu…
# Breve explicación: En la física, las partículas en un sólido tienen una movilidad limitada y oscilan en torno a una posición fija. En un líquido, las partículas se mueven más li…
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9) na2cro4 # of molecules: 1 # of elements: 3 name of element: na= cr= …
# of molecules: 1 # of elements: 3 Name of element: Na, Cr, O # of atoms: Na = 2, Cr = 1, O = 4 Total # of atoms: 7 The #4 is a subscript
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11) pb(no3)2 # of molecules: 1 # of elements: 3 name of element: # of a…
Name of element: Lead, Nitrogen, Oxygen The #3 is a subscript
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progress demonstrate understanding 1. explain why the study of chemistr…
1. A substance is a form of matter with definite composition and distinct properties. Examples: water, sodium chloride. Branches: organic, inorganic, physical, analytical, biochem…
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6. elements in the first group have one outer shell electron and are ex…
6. Alkali metals 7. Alkaline earth metals 8. Transition metals 9. Halogens 10. Noble gases 11. Lanthanide series 12. Actinide series 13. 21 14. 12 15. 4 16. Approximately 20.18 17…
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this passage describes a chemical reaction. read the passage. then, fol…
| Substance | Reactant | Product | |--|--|--| | Silver (Ag) | Yes | No | | Hydrogen sulfide ($H_2S$) | Yes | No | | Silver sulfide ($Ag_2S$) | No | Yes |
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14) 3cacl2 # of molecules: 3 # of elements: name of element: # of atoms…
# of elements: 2 Name of element: Calcium, Chlorine # of atoms (Ca): 3 # of atoms (Cl): 6 Total # of atoms: 9 The #3 is a coefficient
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13) co₂ # of molecules: 1 # of elements: name of element: # of atoms: t…
# Explanation: ## Step1: Analyze CO₂ For CO₂, there are 2 elements, carbon (C) and oxygen (O). There is 1 carbon atom and 2 oxygen atoms, so the total number of atoms is 1 + 2=3. …
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question 24 of 36 the given graduated cylinder is calibrated in millili…
22
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a liquid solvent is added to a flask containing an insoluble solid. the…
$181\ g$
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general chemistry 4th edition mcquarrie • rock • gallogly university sc…
100. W bulb: $\$32.12$/year 25 W bulb: $\$8.03$/year yes
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10. rust has formed all over the metal key. the rust is a new substance…
chemical
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9. mowing the grass is an example of ______ * chemical change physical …
physical change
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8. mixing baking soda and vinegar produces bubbles (gas) and the soluti…
chemical change
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7. which of the following is an example of a chemical change? * shaving…
fireworks going off
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5. which of the following is an examples of a chemical change? * ice me…
burning bread in a toaster
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4. which of the following is an example of a physical change? * - bakin…
tearing paper
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3. which of the following is an example of a chemical change? * boiling…
vegetables rotting
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2. which of the following is an example of a physical change? * baking …
ice melting
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1. which of the following is an example of a physical change? * 10 poin…
B. chopping wood with an ax
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a 76.00 - lb flask of mercury costs $162.00. the density of mercury is …
Price of 1 lb of mercury: $2.13 Price of 1 g of mercury: $0.0047 Price of 1 $cm^{3}$ of mercury: $0.0636 Price of 1 $in^{3}$ of mercury: $1.042 Price of mercury for one manometer:…
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the arcade looked nothing like how cory had imagined. it did not match …
D. schema
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people are likely to remember only information consistent with their sc…
F
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a ____________ is the general idea of objects, events, animals, or peop…
B. concept
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question 26 := multiple choice question how much energy would be produc…
Question 26: 1.4×10¹⁷ J Question 27: 18
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convert 222. °c to k. be sure your answer has the correct number of sig…
495 K
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question 16 :: multiple choice question how many protons does $_{17}^{3…
Question 16: C. 17 Question 17: when a negatively charged object is brought near a positively charged object
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what happens when there are more electrons in the electron cloud than t…
the atom becomes a negative ion
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this is the ability of matter to change in to a different substance. th…
1. Chemical Property 2. Extensive Physical Property 3. Intensive Physical Property 4. Physical Change
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question 7 = multiple choice question what happens when the number of e…
the atom becomes a neutral atom
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what is the mass number of _{17}^{35}cl? 8.5 17 18 35
D. 35
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i. a chemical change breaks bonds, forms new substances and is irrevers…
A. I & III
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how many energy levels are necessary to contain the first 6 electrons i…
2
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perform the following conversions: part 1 of 2 convert 121. °c to k. be…
394 K
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5 multiple choice 2 points in the u.s., laws enacted from the 1780s to …
5. the amount of land and natural resources in the West was endless. 6. 1960s and 1970s.