化学
化学反应、化学计量、分子结构与元素性质。
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2. the valence electrons in atoms are shielded from the attractive pull…
Yes, the reactivity of halogens relates to the shielding effect. As we move down the halogen group, the shielding effect increases, reducing the effective nuclear charge on valenc…
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the element germanium is in what element group? nonmetal metalloid metal
B. Metalloid
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classify the following as either primarily pure chemistry or primarily …
pure chemistry
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sci_phys_cfa1_periodictableatomicstructure_sy26 due friday by 11:59pm p…
Oxygen (O)
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which is a characteristic of addition polymerization? each monomer has …
The polymer contains all the atoms in the monomer units.
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a student writes the following explanation of how certain molecules are…
C. polymerization
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which term best describes this reaction? n c = c h h ch3 h → c c h h ch…
B. addition polymerization
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multiple meanings a solution can be a mixture within a solvent where th…
Polar and ionic molecules
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this reaction eventually forms this product. which type of reaction is …
condensation polymerization
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many repeating, simple subunits are joined together. what is the most l…
B. a polymer
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which best explains the difference between a monomer and a polymer? a m…
D. A polymer is larger than a monomer
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which of the following best describes the relationship between alcohol …
B. Fermentation is a process that uses substances such as bacteria or yeast to change the sugars of fruits or grains into alcohol.
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elimination substitution addition polymerization condensation polymeriz…
addition polymerization
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consider the following diagram of a chemical reaction. initiation r - o…
A. a polymer
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during a reaction, the -oh group of an alcohol is replaced by a chlorin…
D. substitution
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build vocabulary mixture material composed of two or more elements or c…
Polar or ionic molecules
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which term describes this reaction? addition condensation elimination s…
A. addition
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which functional group is found in an amine?
The second option with the $\text{R}-\text{N}-\text{H}$ structure.
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assignments > sci_phys_cfa1_periodictableatomicstructure_sy26 sci_phys_…
Elements in Group 18 of the periodic table (noble - gases like He, Ne, Kr, Xe, Rn) have chemical properties most like argon.
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which functional group is found in an ester?
The second option $\ce{R - C(O)-OR'}$ (where the carbon is double - bonded to oxygen and single - bonded to an oxygen which is further bonded to an R' group) represents the functi…
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which title is most appropriate for this table? r - oh r - o - r r - c …
Uses of Functional Groups Involving Oxygen
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which class of organic compound is commonly used in fuels? o alcohol o …
alcohol
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what is the name of the functional group that is attached to this hydro…
C. alkyl halide
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which class of organic compound is most likely to be used in anesthetic…
ether
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which compound is responsible for the smell that is associated with the…
C. cadaverine
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organic compounds. the size and arrangement of the rings, along with ot…
ring structures
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the melting point of a substance was determined to be 35.7 °c in the la…
C. 2.59%
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examine the general structure of a molecule. r - c - h with cooh on top…
B. a carboxylic acid and an amine
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chemists refer to positively charged ions as cations. chemists refer to…
| Symbol | $\ce{^{88}_{38}Sr^{2+}}$ | $\ce{^{32}_{16}S^{2-}}$ | $\ce{^{70}_{31}Ga^{3+}}$ | $\ce{^{80}_{35}Br^{-}}$ | |--|--|--|--|--| | Atomic Number | 38 | 16 | 31 | 35 | | Mass …
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which general formula represents the functional group in a carboxylic a…
C. RCOOH
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which is a property of both alkenes and alkynes? both are highly water …
Their boiling points tend to increase with chain length.
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rubber is manufactured from latex that is produced from rubber trees. w…
It is made from the polymerization of a long chain of alkene molecules.
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movement of water molecules across a semi - permeable membrane. when so…
A. water
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the energy required to remove a valence electron from a neutral gaseous…
Halogens have high ionization energies because they are one electron short of a stable noble - gas configuration. It is energetically unfavorable for them to lose an electron to f…
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chemistry: chemical reactions - testing for ions experiment station #1.…
Sample #1 was distilled water, I know because it had no electrical conductivity and no calcium ions. Sample #2 was Arizona river water. Sample #3 was Kitchener tap water, I know b…
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which step in naming unsaturated hydrocarbons is used for alkenes but n…
Examine the multiple bond for cis - and trans - isomers.
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plant oils are made up of small organic molecules that are called terpe…
D. a naturally occurring, branched - chain alkene
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what is the name for this molecule? nonene nonane 1 - octyne 1 - octene
C. 1 - octyne
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the electron configuration of an element is: 1s² 2s² 2p⁶ 3s² 3p⁵. the e…
D. chlorine
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consider the hydrocarbon below. what is the name of this hydrocarbon? p…
D. ethene
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if 4f¹², the 12 stands for the ____. 12 electrons in the f sublevel; th…
12 electrons in the f sublevel
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which is a property of alkynes? o alkynes have a neutral ph. o alkynes …
Alkynes tend to be acidic.
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q4 16 the 3p atomic sublevel has the shape of a clover daisy sphere dum…
D. Dumbbell
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what is the name of a hydrocarbon that has the formula ch3(ch2)4cch? 6 …
C. 1 - heptyne
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what is the name for this molecule? ch₃ h₂c — c≡c — ch₂ h₃c 3 - heptyne…
A. 3 - heptyne
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question 7 of 12 an atom is too small to be seen with the naked eye. ba…
An atom is too small to be seen with the naked eye.
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how many valence electrons should magnesium have in its lewis dot model…
A. 2
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how many electrons should boron have around its lewis dot model? 4 3 2 1
3
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if a fluorine atom gains 1 electron, it would become f⁻ f⁺ o ne
$F^-$
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7 of 11 this could be the dot diagram of cl c o mg
Cl
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8. the pauli exclusion principle states that in order to occupy the sam…
Spin in opposite directions
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the d sublevel contains ______ atomic orbitals and holds a maximum of _…
5; 10
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which of the following cannot exist? 2d 3d 4f 4p
A. \(2d\)
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you have learned that not all atoms of an element are the same. variati…
1. | | Metal or Nonmetal | Is the number of protons the same in the atom and the ion? | Is the number of neutrons the same in the atom and the ion? | Is the number of electrons th…
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hot air balloons carry passengers high above the ground. density is def…
1. related to the study of weather
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balloons powered by science up, up, and away! hot - air balloons fascin…
4. "For passengers, a hot - air - balloon ride offers an amazing view of the world and a memorable lesson in science." (Paragraph 7)
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up, up, and away! hot - air balloons fascinate, amaze, and delight peop…
1. "Hot - air balloons are based on a single concept: warm air rises and cool air falls." (Paragraph 2)
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in the configuration 3p^5, the \3\ represents... the number of orbitals…
The energy level
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up, up, and away! hot - air balloons fascinate, amaze, and delight peop…
1. find
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1. the maximum numbers of electrons in each of the sublevels are ______…
s-2, p-6, d-10, f-14
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15 the major difference between a 1s and a 2s orbital is that the _____…
2s orbital is at a higher energy level
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the table shows some characteristics of a few atoms. element carbon (c)…
neutrons
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you add a few drops of a strong acid to a beaker of liquid with a ph of…
Buffer
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what is the charge of an ion with 26 protons, 28 neutrons, and 27 elect…
-1
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select the word(s) to complete the word equation that matches the descr…
1. hydrogen + oxygen 2. magnesium oxide 3. water + carbon dioxide
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1. how does the addition of an enzyme affect a chemical reaction? 2. ho…
1. An enzyme lowers the activation energy of a chemical reaction, increasing the reaction rate. 2. Initially, adding more substrate increases the enzyme - reaction rate until enzy…
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an atom has 22 neutrons and a mass number of 48. how many protons would…
26 protons
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which compounds would you expect to form a covalent bond? select all th…
B. $CBr_4$, C. $H_2O$
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the closest energy level in a bohr model can hold no more than ____ ele…
2
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who discovered that the nucleus exists in the center of the atom? chadw…
D. Rutherford
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17 multiple choice 1 point an atom has an atomic number of 11. how many…
B. 11
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a neutral atom of carbon (c) has an atomic number of 6. how many electr…
B. 6
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this is a correct dot diagram for carbon (c) true false
True
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14 multiple choice 1 point a neutral atom of fluorine (f) has an atomic…
D. 9
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what type of chemical reaction occurs when two compounds exchange parts…
Double displacement
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2. dado que el cloruro de sodio se clasifica como un compuesto, una mue…
más de un tipo de átomo.
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which form of energy do plants give out to consumers? mechanical kineti…
chemical
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14 multiple choice 1 point a neutral atom of fluorine (f) has an atomic…
D. 9
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2. ¿cuál es el mejor ejemplo de una reacción química? un prisma refract…
El oxígeno absorbe la luz solar formando moléculas de ozono.
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an atom of sulfur (s) has a mass number of 34 and an atomic number of 1…
18
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8 multiple choice 1 point what subatomic particle determines the identi…
B. Proton
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what is the atomic number of an atom with 29 protons? 30 29 27 28
B. 29
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which scientist is responsible for portraying the atom as seen below? s…
B. Bohr
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place the correct term in the sentence below. through polymerization √,…
Label A: monomer Label B: monomer Label C: polymer
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1. ¿qué afirmación describe una acción que probablemente resultó en una…
Un niño sopló a través de una varita llena de jabón y se produjeron burbujas.
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place the correct term in the sentence below. through, larger molecules…
polymerization
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3 multiple choice 1 point an atom of lithium (li) has a mass number of …
B. 4
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2. ¿qué acción haría que el azúcar forme una nueva sustancia? borrar to…
cocinar azúcar en una estufa
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multiple choice 1 point the image below can best be associated with whi…
D. Rutherford
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q4 2. ¿cuál es un ejemplo de sustancias que reaccionan químicamente? bo…
El hierro y el oxígeno forman óxido.
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what do we call an element that has the same number of protons but a di…
Isotope
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¿qué es un cambio químico? borrar todo ○ papel rasgado ○ el agua se con…
C. Quema de papel
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2 un científico colocó una muestra de litio en un recipiente con agua. …
Se produjo un cambio químico.
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single double triple quadruple
single
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the relative amount of free hydrogen and hydroxyl ions in the water is …
1. B. the ph scale 2. B. suspension
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rubber is manufactured from latex that is produced from rubber trees. w…
It is made from the polymerization of a long chain of alkene molecules.
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which is a property of alkynes? alkynes have a neutral ph. alkynes tend…
Alkynes are not soluble in water.
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plant oils are made up of small organic molecules that are called terpe…
D. a naturally occurring, branched - chain alkene
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which is composed of aromatic hydrocarbons? clothing barbeque fuel pain…
B. barbeque fuel
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single molecules made of two or more elements are called: * mixtures so…
1. C. compounds 2. B. mixture