Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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question an ion is a charged atom, due to an unequal number of protons …
$N^{3-}$
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what is the symbol for the element arsenic? arsenic is in group 5a(15) …
B. As
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what is the symbol for the element oxygen? oxygen is in group 6a(16) wh…
B. O
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question what element has the symbol f? this element is in group 7a(17)…
Fluorine (the option with "Fluorine" as the text, corresponding to the fourth circle in the options)
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question what element has the symbol ga? this element is in group 3a(13…
B. Gallium
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question what element has the symbol ca? this element is in group 2a(2)…
B. Calcium
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multiple choice 1 point in an ethane (c2h6) molecule, each carbon atom …
3
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18 multiple choice 1 point which of the following molecules is often us…
Ketones
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multiple choice 1 point why are hydrocarbons insoluble in water? they a…
The majority of their bonds are nonpolar covalent carbon-to-hydrogen linkages.
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multiple choice 1 point what often occurs to hydrocarbon chains in an a…
The branching characteristics of the chain changes
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multiple choice 1 point which of the following functional groups decrea…
Amino
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multiple choice 1 point the complexity and variety of organic molecules…
The chemical versatility of carbon atoms
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multiple choice 1 point which of the following functional groups increa…
Carboxyl
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multiple choice 1 point a carbon atom is most likely to form what kind …
C. Covalent
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multiple choice 1 point which of the following is the most electronegat…
Oxygen
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multiple choice 1 point when hydroxyl groups are added to a hydrocarbon…
Polar covalent bonds are formed making the molecule more hydrophilic
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multiple choice 1 point compared to a hydrocarbon chain where all the c…
Have less hydrogen atom
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5 multiple choice 1 point which chemical group is most likely to be res…
Amino
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multiple choice 1 point how many electrons does one atom of carbon shar…
4
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multiple choice 1 point research indicates that ibuprofen, a drug used …
Are mirror images of each other
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multiple choice 1 point a carbon atom has 6 electrons however, its vale…
Has only 2 electrons in its first shell and 4 in the second shell
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chm 1045 module 2 dimensional analysis assignments part iv. multi - ste…
16. $82.5\ \text{liters}$ 17. $\approx 7888\ \frac{\text{kg}}{\text{m}^3}$ 18. $324\ \text{mg per day}$ 19. $9.70\ \text{kg}$ (rounded to 3 significant figures) 20. $56.7\ \text{k…
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if a suspects computer is found in an area that might have toxic chemic…
a. Coordinate with the hazmat team.
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carbon-14 is an element that loses about 10% of its mass every millenni…
A. The graph starting at (0, 600) with an exponential decay curve decreasing rapidly then approaching 0
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complete the sentences with the correct phrases. maria works in a chemi…
1. always conducts 2. doesn't finish 3. can harm 4. would benefit
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7. what reports are located under the \assessment\ tab?: --select-- --s…
a. Admission Health History, Admission Assessment, Physician Progress notes
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processed foods make up 50 percent of the current american diet. though…
B. two chemical additives that sound very scary
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select the correct answer. which of these elements has two electrons in…
D. silicon (Si)
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drag each tile to the correct location. classify the chemical equations…
## Balanced: $2CO + 2NO ightarrow 2CO_2 + N_2$ $H_2CO_3 ightarrow H_2O + CO_2$ ## Not Balanced: $6CO_2 + 6H_2O ightarrow C_6H_{12}O_6 + O_2$ $2Cu + O_2 ightarrow CuO$
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select all the correct answers. which of these are examples of mixing a…
- removing seed casings from grains - a soda bottle bubbling when it is opened - removing salt from seawater
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select the correct answer from each drop - down menu. a molecule of chl…
chlorine is an element and carbon dioxide is a compound
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which of these elements is a metal? a. hafnium (hf) b. radon (rn) c. si…
A. hafnium (Hf)
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drag the tiles to the correct boxes to complete the pairs identify the …
Michael uses a car that burns fossil fuels. → combustion reaction Alan grows tomatoes on his farm. → photosynthesis Lisa eats eggs for breakfast. → respiration
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select the correct answer. which law represents a balanced chemical equ…
C. law of conservation of mass
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select the correct answer from each drop - down menu. the chemical form…
Coefficient: 4, Subscript of carbon: 10, Subscript of hydrogen: 8
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select the correct answer. which of these pairs of elements have the sa…
C. carbon (C) and lead (Pb)
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what is the iupac name for the compound shown? iupac name:
5-propylnonane
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part b review the videos, and then draw the structure shown. begin by a…
The molecular structure should be drawn as follows (description): A 5 - membered ring containing a sulfur (S) atom, fused with a 4 - membered ring containing two nitrogen (N, labe…
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10. based on the provided data, which of the following amounts of magne…
C. 0.5 g Mg and 30 mL HCl
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9. the scientist noticed that at the end of the combustion analysis, a …
B. Rerun the gas through the device to isolate pure oxygen gas.
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think like a scientist read about each scientific investigation. then a…
A. oxygen gas, $O_2$
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directions: read “our musical bonds.” then, answer the questions. 1. mu…
B. releasing a chemical in our brains ### Question 2
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question 6 2 points you add a chemical to water and the ph drops. the s…
An acid and the amount of H+ increases.
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question 5 (2 points) the bond between the elements in cl₂, also called…
Question 5: B. Covalent. Question 6: Acidic solution (Note: Since options were not provided for Question 6, this is the correct term for the described solution)
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music and mood music has the power to influence and shift our moods. li…
D. by comparing music that is sad to music that is uplifting ### Question 2
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match the term to its proper example. prompts 1 molecule (not compound)…
1. Molecule (not compound) - Ozone (O3) 2. Anion - Br- 3. Cation - Ca+2 4. Element - Zn 5. Compound - Salt (NaCl)
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application fuel 10 pts possible a fuel cell car is powered by electron…
1. 37.2 L
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the following equation describes the oxidation of ethanol to acetic aci…
5. 65.1%
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u5g5 3f₂(g) + w(s) → wf₆(g) how many grams of tungsten are required to …
3. 1550 g \(WF_6\)
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25) using the periodic table, predict which compound is ionic: (1pts) \…
$\boldsymbol{\square \ Rb_2SO_4}$ (checked option)
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24) using the periodic table, predict which compound is molecular. (1pt…
$\boldsymbol{SiO_2}$
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23) which element is not reactive? (1pts) silicon vanadium barium helium
helium
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23) which element is not reactive? (1pts) silicon vanadium barium heliu…
23. $\square$ silicon $\square$ vanadium $\square$ barium $\square$ helium 24. $\square$ MgO $\square$ FeS $\square$ NaOH $\square$ SiO$_2$
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21) which element is malleable, ductile, and a good conductor of electr…
21) Cu 22) transition metals
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20) which of the following is a metalloid? (1pts) i sb c s
□ Sb
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17) consider the chemical formula for one molecule of ethanol, c₂h₅oh. …
16) $\boldsymbol{29}$ 17) $\boldsymbol{30}$
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15) the number of nonmetal atoms in ca(mno4)2 is (1pts) 2 3 4 8
$\square$ 8
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13) the formula ca₃(po₄)₂ contains: (1pts) □ 4 oxygen atoms □ 5 nonmeta…
13) $\boldsymbol{\square}$ 4 oxygen atoms $\boldsymbol{\square}$ 5 nonmetals $\boldsymbol{\checkmark}$ 13 total atoms $\boldsymbol{\square}$ 14 total atoms 14) $\boldsymbol{\squar…
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12) the formula c₂h₅ch(cooh)₂ contains (1pts) 7 hydrogen atoms 4 carbon…
$\boldsymbol{\square}$ 8 hydrogen atoms
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11) which of the following formulas contains the fewest oxygen atoms? (…
A. $\text{Al(C}_2\text{H}_3\text{O}_2\text{)}_3$
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10) the number of nonmetallic atoms in (nh4)2so4 is (1pts) □ 5 □ 8 □ 10…
$\boldsymbol{\square}$ 15
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9) which of the following is a cation? (1pts) ☐ n³⁻ ☐ li⁺ ☐ o²⁻ ☐ fe²⁺
$\boldsymbol{\text{Fe}^{2+}}$
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8) which of the following is a member of noble gases? (1pts) □ chlorine…
□ chlorine □ oxygen □ nitrogen ☑ krypton
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6) the alkaline earth metals are in group ____. (1pts) □ 1a □ 2a □ 3a □…
6) 2A 7) nitrogen 8) helium
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5) the smallest particle of an element that can enter into a chemical r…
□ atom
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3) which of the following cannot be broken down by chemical or physical…
3) element 4) boron
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thinking about your answers above, what is the relationship between tem…
C. There is a direct relationship between temperature and pressure. Increasing temperature increases pressure. (Note: Assuming the third option has a typo "Incrasng" which should …
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question 5 (2 points) what is the anion in the formula - al₂(so₃)₃? the…
\( \text{SO}_3^{2-} \) (the option with "SO₃²⁻")
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question 3 (2 points) what is the name for co(no₃)₂? ○ cobalt (ii) nitr…
D. cobalt (II) nitrate ### Question 4
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question 1 (2 points) what is the formula for aluminum nitride? aln₃ al…
C. AlN ### Question 2
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1) the elements on the periodic table are placed in order of increasing…
1) atomic number 2) nonmetal
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7 multiple answer 1 point causes of soil pollution: (check all that app…
7. industrial waste, garbage, use of chemical fertilizers and pesticides, deforestation 8. True 9. True
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causes of air pollution: (check all that apply) □ vehicle exhaust □ tob…
1. Causes of air pollution: - ☑️ vehicle exhaust - ☑️ tobacco smoke - ☑️ construction activities - ☐ air purifier 2. Question 5: True 3. Question 6: True
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in \i, too,\ how does the speaker respond to racial exclusion? with den…
C. With hope and quiet resistance ### Second Question (How does the structure of "I, Too" reflect the poem’s message?):
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a car is driving along the road. what kind of energy is shown here? kin…
kinetic energy
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clothes are hanging from a clothing rod. what kind of energy is shown h…
B. gravitational potential energy
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an element with mass 420 grams decays by 11.8% per minute. how much of …
58.9
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individual elephants and arctic herbivores such as caribou tend to have…
A. It discusses a characteristic shared by certain animals in order to explain why researchers raised a possibility that turned out not to be supported by data described later in …
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the metal bar shown is an alloy of silver and other metals. 7.5 ounces …
0.675
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student exploration: moles prior knowledge questions (do these before u…
### Prior Knowledge Questions 1. **Answer**: For a dozen donuts, a dozen eggs, and a dozen roses, you have 12 of each item. (Because a dozen is defined as 12 of something.) 2. **A…
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quiz question 7 of 10 in the early 20th century, scientists discovered …
D. nitric acid
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quiz question 1 of 10 which of the following is true of nitrogen? choos…
A. It's the most abundant element in the atmosphere.
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convert 0 °c to °f. round to the nearest whole number. answer numeric 1…
32 212 Yes; 75.2
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convert 110 kelvin to °c answer numeric 1 point convert 45°f to °c. rou…
-163.2 °C -7.2 °C 32 °C
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4. what do the elements sulfur (s), nitrogen (n), phosphorus (p), and b…
All of these elements are non-metals (gold-colored on the provided periodic table).
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3. what is the atomic number of this element? 12 24.305 24
12
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2. elements on the periodic table of elements are primarily listed in a…
the number of protons
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1. which characteristic of an atom determines whether it will combine w…
A. Its number of valence electrons
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human activities and earth’s atmosphere evidence from scientific studie…
B. using renewable energy sources instead of fossil fuels
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la ecuación para la ph de una sustancia es $\\text{ph} = - \\log\\text{…
3.3
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day 4: thursday, january 22nd (4 total days in the quarter) define \org…
Organic chemistry is the branch of chemistry that studies carbon - containing compounds (and their structure, properties, synthesis, and reactions), often with other elements like…
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el aderezo que se usa para las ensaladas es un ejemplo de — a. sustanci…
D. mezcla heterogénea.
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¿cuál criterio se utiliza para agrupar los elementos de la tabla periód…
C. las propiedades químicas y físicas similares que comparten
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en un experimento se vierten 4 líquidos con densidades distintas en un …
D. glicerina, agua, aceite de palma, isopropanol
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la ilustración muestra el diagrama de lewis para el elemento argón. ¿cu…
$1s^2 2s^2 2p^6 3s^2 3p^6$
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un objeto con una masa de 13.0 g y un volumen de 63.0 ml se echa en un …
C. Flotará porque la densidad del objeto es menor que la del agua.
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una materia formada por la unión física de dos o más materiales y que t…
B. mezcla homogénea.
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para realizar un experimento, es necesario separar una mezcla que conti…
D. filtración
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la supervisión y actualización de la tabla periódica está a cargo de un…
B. Unión Internacional de Química Pura y Aplicada
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complete the passage with the words that make the most sense. supernova…
First blank: supernovas Second blank: molecules