Chimie
Réactions chimiques, stœchiométrie, structures moléculaires et propriétés.
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ms. jameson is using \sonnet 18\ by william shakespeare to teach her st…
A. aa
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a sample of sand is taken at random from the shore of a lake. the table…
C. The proportion of garnet will be less than 0.1.
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which type of medicine kills disease - causing bacteria to prevent infe…
A. Antibiotics
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6. calculate the relative atomic mass for germanium $_{32}^{70}ge = 20.…
The relative atomic mass of Germanium is approximately $72.69$ and the relative atomic mass of Selenium is approximately $79.04$
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5. calculate the relative atomic mass for titanium using the following …
47.92
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3. calculate the relative atomic mass for magnesium using the following…
The relative atomic mass of magnesium is approximately $24.31$ and the relative atomic mass of silicon is approximately $28.11$.
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sample response: one way this poem reflects dickinsons style is that it…
The poem is written in the first person. The poem uses four - line stanzas. The poem plays with rhyme scheme.
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1. calculate the relative atomic mass for nitrogen using the formula $^…
1. The relative atomic mass of nitrogen is $14.0037$. 2. The relative atomic mass of boron is $10.801$.
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1. $_{91}^{231}pa\ ightarrow _{2}^{4}he + _{89}^{227}\\\\2. $_{95}^{241…
1. $^{231}_{91}Pa ightarrow^{4}_{2}He+^{227}_{89}Ac$ 2. $^{241}_{95}Am ightarrow^{4}_{2}He+^{237}_{93}Np$ 3. $^{292}_{94}Pu ightarrow^{4}_{2}He+^{288}_{92}U$ 4. $^{226}_{88}Ra igh…
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which term refers to the substance that is dissolved into another subst…
A. solute
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question 31 not yet answered points out of 3.00 flag question which kin…
B. old vs. new C. dark vs. light E. opaque vs. transparent
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which quantities are inversely proportional if other variables are held…
volume and pressure
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there are 500 molecules in an airtight bucket, and the volume is held c…
Adding 100 more molecules and increasing the temperature by 10K
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the boiling point of methanol is 64.7°c. its melting point is -97.6°c. …
B. liquid
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question 26 not yet answered points out of 3.00 flag question what kind…
D. monochromatic
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question 8 not yet answered points out of 3.00 flag question select the…
a. the overall shapes of the walls and ceiling/roof are geometric, but these forms are made up of smaller organic shapes c. the ceiling materials and lighting design are lighter i…
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22. ____________ metal 23. ____________ chlorine 24. ____________ metal…
22. g. loses electrons in bonding 23. c. a halogen 24. d. make good semiconductors 25. b. metals with unpredictable properties 26. e. alkali metals 27. f. has a full outer energy …
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select the 2 statements that best match the visual appearance of this t…
b. The surface of the kettle has implied texture. e. The circular and semi - circular forms used in the tea kettle are geometric.
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29 what do the dots in lewis dot diagram represent? a protons b valence…
B. Valence electrons
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28 how many valence electrons does chlorine (cl) have based in lewis do…
B. 7
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27. what do atoms of elements that are in the same group share? a numbe…
C. number of valence electrons
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small - scale lab i & e standard: 1d now what do i do? purpose to solve…
The value of $m_{single - drop,mg}$ after performing above steps.
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when naming binary ionic compounds with metals that typically form only…
1. False 2. The formula is incorrect because the charges were not balanced; the correct formula is $MgCl_{2}$
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25 if an atom has 19 protons and 20 neutrons, what is the atomic number…
A. 19
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the iupac name for the ionic compound k₃n is tripotassium nitride. * 1 …
1. False 2. A. \(Pb(NO_3)_2\)
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supply chain questions - due tomorrow!! toothpaste requires an abrasive…
B. calcium carbonate
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analyze using your experimental data, record the answers to the followi…
1. Cannot calculate. 2. Cannot calculate. 3. $1000\ mg/cm^{3}$, $1000\ mg/mL$ 4. Cannot calculate. 5. Cannot calculate. 6. Newer penny has more low - density zinc.
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given the iupac name lead(ii) nitrate, what is the correct chemical for…
1. $Pb(NO_3)_2$ 2. False
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supply chain questions - due tomorrow!! propylene glycol helps retain w…
D. deice the wings of airplanes
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22 according to the bohr model above, what is the atomic mass of sodium…
C. 23
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what is the correct chemical formula for the ionic compound tin(iv) oxi…
1. $SnO_{2}$ 2. True 3. $Ca_{3}(PO_{4})_{2}$
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iron can form ions with charges of +2 and +3. what roman numeral is use…
1. B. III 2. C. iron(II) chloride
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21 if an atom has 18 protons and 22 neutrons, what is the atomic mass? …
B. 40
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what is the correct iupac name for the ionic compound with the chemical…
1. iron(II) chloride 2. True
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if an ionic compound has the chemical formula mg₃n₂, what are the charg…
1. Mg²⁺, N³⁻ 2. Sodium sulfide
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
1 x 10^-12 (the last option)
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the criss - cross method involves exchanging the numerical value of the…
1. True 2. False
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20 analyze the bohr model below. 6. which three statements best describ…
A. The mass number is 4 and the atomic number is 2. B. This element has a full energy level. C. This element has 2 valence electrons.
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when applying the criss - cross method, the signs (+ or -) of the ionic…
1. A. False 2. B. KCl
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
D. Coefficient can be positive or negative.
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which of these shows a single displacement reaction? ab + cd → ad + cb …
1. C. $A + BC ightarrow AC + B$ 2. C. Synthesis
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21. complete the following chart. | | k | mg | na | n | cl | si | |--|-…
The completed table is shown above.
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true or false: in a balanced chemical equation, the number of atoms of …
1. True 2. Carbon + Oxygen → Carbon Dioxide 3. A + BC → AC + B
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the main, or central, idea of the passage is isatou ceesay started a re…
It establishes the significance of the lack of waste collection.
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read the passage. pocketbooks from trash excess garbage is a long - sta…
Isatou Ceesay started a recycling program in order to clean up the trash in her Gambian village.
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true or false: a synthesis reaction involves breaking down a compound i…
False 10 grams Synthesis
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the amount of valence electrons tell you what about the element?
The chemical reactivity, bonding ability, and group position in the periodic table.
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what did we learn about cigarette filters that were marketed as creatin…
No cigarette, filtered or unfiltered, is truly safe
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what happens when a chemical reaction takes place? things stay exactly …
1. New things with different properties are made. 2. Decomposition 3. $2KClO_3 ightarrow2KCl + 3O_2$
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
A. 4
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_____ is an example of a polar bond and _____ is an example of a non - …
1. A. C - O; P - P 2. A. C - O; P - P 3. C. 9 4. D. Will a bird's brain size shrink if it flies long distances?
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
0.75
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what element is shown in the electron configuration below? 1s²2s²2p⁶3s²…
Rubidium
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in a single displacement reaction, what is always one of the products? …
1. C. A different element by itself 2. Hydrogen + Oxygen → Water
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match the noble - gas notations with their correct elements. kr5s²4d¹⁰5…
$[Kr]5s^{2}4d^{10}5p^{3}$ - Antimony $[Xe]6s^{2}4f^{14}5d^{6}$ - Osmium $[Rn]7s^{2}5f^{11}$ - Einsteinium $[Kr]5s^{2}4d^{10}5p^{5}$ - Iodine
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match the elements with their correct noble gas notation configurations…
Chlorine - $[Ne]3s^{2}3p^{5}$ Radium - $[Rn]7s^{2}$ Arsenic - $[Ar]4s^{2}3d^{10}4p^{3}$ Fluorine - $[He]2s^{2}2p^{5}$
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you mix silver nitrate (agno₃) and sodium chloride (nacl) in water. two…
1. Double displacement 2. Combustion 3. A different element by itself
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
There is no correct option provided in the given choices. The correct length in kilometers is 0.105.
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describe how plant acids contribute to the weathering of rocks and prov…
Plant roots secrete organic acids that chemically react with rock - forming minerals, causing weathering. An example could be roots of trees in rock cracks secreting acids that br…
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electron configuration and noble gas notation match the elements below …
bromine - $4p^{5}$ strontium - $5s^{2}$ lanthanum - $4f^{1}$
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chemistry_quiz 2 locked mode is on. to avoid losing your progress, comp…
C. they are equal
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what element has the following electron configuration? 1s²2s²2p⁶3s²3p⁶4…
C. iron
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what contributes to the high level of biodiversity found in wetlands? a…
d. all of the above
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what element has the following electron configuration? 1s²2s²2p⁶3s¹ o p…
sodium
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what element is shown below in the orbital diagram given? 1s 2s 2p fluo…
oxygen
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electron configuration and noble gas notation the orbital diagram below…
phosphorus
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your younger cousin mary is a rising senior in high school this year an…
Dear Mary, First, a college degree in chemical engineering is definitely worth it. It will likely lead to higher - paying and more fulfilling jobs compared to starting with just a…
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what element is the orbital diagram showing? 1s 2s 2p ground state oxyg…
C. nitrogen
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in the chemical equation 2mg + o₂ → 2mgo, identify the reactant(s). mg …
1. D. Mg and O2 2. B. Yes, because magnesium is higher on the list.
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electron configuration and noble gas notation what is the correct elect…
1s²2s²2p⁶3s²3p⁵
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atch the correct sublevels (s, p, d, and f) with the number of electron…
s - 2 electrons p - 6 electrons d - 10 electrons f - 14 electrons
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name: sidney date: sept 24th period: 2nd carbon cycle webquest https://…
1. Biogeochemical cycle 2. Carbon, hydrogen, oxygen, nitrogen, phosphorus, sulfur 3. Carbon comes from the atmosphere (as carbon dioxide), and after leaving plankton, it can be pa…
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what is the smallest particle of the element gold (au) that can still b…
A. Atom
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balance this equation: mg + hcl → mgcl₂ + h₂ mg + 2hcl → mgcl₂ + h₂ 2mg…
1. Mg + 2HCl → MgCl₂ + H₂ 2. The copper is being replaced by the zinc. 3. No, because there are more oxygen atoms on the left.
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which element has the most protons? a potassium (k) b sodium (na) c hyd…
A. Potassium (K)
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what is the purpose of calculating the theoretical yield in a chemical …
A. To predict the maximum amount of product that can be obtained
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calculator sodium-24 has a half - life of 15 hours. how many grams of a…
14.0625 g
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which of the following best describes the theoretical yield in a chemic…
B. The calculated amount of product based on stoichiometry
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11 as you move from left to right across the periodic table, what happe…
B. become less metallic
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in a chemical reaction, if the actual yield is 75 grams and the theoret…
A. 93.75%
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in a chemical reaction, the actual yield is 90 grams, and the theoretic…
d. 90%
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how is molar mass defined? a. the weight of a single atom b. the energy…
C. The mass of one mole of a substance, expressed in grams per mole
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10 which two elements on the periodic table are in the same period ? a …
C. Sn and Rb
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9 what does the atomic number in the periodic table represents? a atomi…
D. Number of protons
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8 how many protons, neutrons, and electrons does xenon have? a 54 proto…
D. 54 protons, 77 neutrons, and 54 electrons
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when two elements bond and form a compound, what happens to their neutr…
The neutrons remain the same in the nucleus of each atom.
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7 how many electrons can the second energy level hold? a 2 b 18 c 8 d 32
C. 8
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when two elements bond and form a compound, what happens to their proto…
The protons remain the same in the nucleus of each atom.
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6 which three statements describe the color - coded areas of the period…
B. The medium color - coded elements are non - metals. D. The lightest color - coded elements are metals. E. The darkest color - coded elements are non - metals.
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how many carbon atoms are in a carbon monoxide molecule? hint: in the m…
1
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which of these is the atomic mass of argon (ar)? ar 18 39.948
39.948
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sonnet 2 by gwendolyn bennett some things are very dear to me— such thi…
1. Underline and bold comparison word clues: Identify and mark words like "such as", "like". 2. Highlight the rhyme scheme using color - coding: Analyze and color - code end - sou…
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which of these is the atomic number of silver (ag)? 47 107.868 ag
47
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which element has 33 protons in its nucleus? phosphorus selenium arsenic
C. Arsenic
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according to the bohr model, how many total electrons does sodium have?…
B. 11
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which of these elements has the largest number of protons? technetium t…
Rhenium
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a covalent bond is formed by the sharing of _______, whereas an ionic b…
1. electrons; transfer of electrons from one atom to another 2. unsaturated fatty acid 3. It contains two hydrocarbon chains bound to glycerol by ester bonds. 4. non - polar (miss…
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which part of an atom is found outside the nucleus? neutrons protons el…
Electrons
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according to the bohr model above, how many valence electrons does sodi…
C. 1
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what is the very smallest piece of silver possible? a silver atom a sil…
a silver atom