Química
Reacciones químicas, estequiometría, estructuras moleculares y propiedades.
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why do metals conduct they are shiny the electrons are shared between t…
The electrons are delocalised and able to move.
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what is the ability of a substance to be pulled into a thin strand? con…
C. Ductility
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which of these is not an alloy? brass bronze stainless steel copper
copper
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what does malleable mean? can be used for wire will break easily is shi…
able to be shaped
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there are more metals than non metals in the periodic table. true false
True
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there are more metals than non metals in the periodic table. true false
True
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what is the basis of a metallic bond? the attraction of neutral metal a…
3. the attraction between positive metal ions and free floating electrons.
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directions: use your notes to answer the following questions. 1. rank t…
1. \(O < C < Al < K\) 2. \(Ne < Al < S < O\) 3. Fluorine has a smaller atomic radius (electrons closer to nucleus, more strongly held) compared to iodine. 4. Same number of valenc…
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complete and balance the following redox reaction in acidic solution. b…
\(10ClO_{3}^{-}(aq)+8H^{+}(aq)+I_{2}(s)\to 10ClO_{2}(g)+4H_{2}O(l)+2IO_{3}^{-}(aq)\)
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provide the oxidation number of the s atom in so₃²⁻.
\(+4\)
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the oxidation number of a nitrogen atom in n₂o₃ is
\(+3\)
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reactants vs. products quick check in a reaction, 1 mole of silver nitr…
There will be 1 mole of silver ($Ag$) in the product.
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lead (ii) nitrate as $pb(no_{3})_{2}$ and potassium iodide as $ki$ comb…
1 mole of lead (II) nitrate and 2 moles of potassium iodide
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reactants vs. products quick check sulfur trioxide gas combines with wa…
\(H_2SO_4\) (the fourth option)
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reactants vs. products quick check when 1 mole of nitrogen gas (n₂) rea…
2 moles
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reactants vs. products quick check according to the law of conservation…
The number of atoms of each element in the reactants is the same as the number of atoms of each element in the products.
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elaborate: constructing an evidence - based argument use the scaffold b…
Investigation Question: Is our Sun releasing energy due to chemical or nuclear reactions? Claim: The Sun is releasing energy due to nuclear reactions. Evidence Summary: Nuclear fu…
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how does frost use irregular blank verse to affect the language of his …
Frost makes the language sound like everyday speech through irregular blank verse.
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patterns of the periodic table: • the vertical columns of the periodic …
- Vertical columns: groups or families. - Horizontal columns: periods or rows. - Main - group elements: groups 1, 2, 13 - 18; transition elements: groups 3 - 12. - Metals: left si…
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5. what happens when hydrogen fuel is consumed in a fuel cell? it relea…
5. It produces only water 6. Crops like corn, barley, and wheat
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a. multiple - choice questions: encircle the letter of the best answer.…
1. C. A combination of substances not chemically combined 2. C. Air 3. C. Elements are chemically bonded in fixed ratios 4. D. Soil 5. A. Filtration B. 1. Compound 2. Mixture 3. E…
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elements and the periodic table — how much do you remember? goal :asses…
1. F, A particle that gains electrons is called an anion. 2. F, The symbol \(_{13}^{27}\text{Al}\) represents an atom that has 13 protons and 14 neutrons. 3. F, Elements that have…
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question 1 - 10 which historical development led to the use of chemical…
obstacles of trench warfare
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in response to high blood pressure, stretch receptors called __________…
A. baroreceptors; decrease
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12. what does a stars color tell us? a) its chemical composition c) its…
12. C. Its temperature 13. C. Photosphere 14. C. Corona 15. B. Photosphere, Chromosphere, Corona
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identifique los siguientes enlaces como iónicos o covalentes: * co₂ (di…
- \(CO_2\) (dióxido de carbono): B. Covalente - ¿Qué ocurre con los electrones en un enlace iónico?: A. Los electrones son donados por el metal al no metal en el compuesto. - Un á…
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which of the following is not a function of csf? to regulate the chemic…
To provide oxygen and nutrients to the nervous tissue
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which best explains why the equation below is not balanced? 2na + h₂o -…
there is not enough water in the reactants
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what is the total number of oxygen atoms on the product side of the equ…
\(5\)
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if a chemical reaction begins with 22 atoms of nitrogen, how many atoms…
22
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dean combines 34 grams of one chemical and an unknown amount of another…
\(82\) grams
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substance a has a mass of 11 grams. when substance a was mixed with sub…
the mass of the product is equal to the mass of the reactant
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a chemical reaction separates water into hydrogen and oxygen gas. which…
The combined mass of the gases is the same as the mass of the water.
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a sealed test tube containing 5 grams of iron filings and 10 grams of s…
The product will have a mass of 15 grams.
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when 5 grams of silver nitrate are added to a 50 gram solution of potas…
the final weight of the product equals the weight of the reactants
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the compound ammonia is composed of nitrogen and hydrogen atoms. if 2 a…
6
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which best describes a chemical reaction applying the law of conservati…
C. a balanced equation in which the reactants and products equal
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question 1 what type of reaction releases energy? endothermic exothermi…
Question 1: B. Exothermic Question 2: A. Endothermic Question 3: Released
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when a solid suddenly appears in a solution and settles to the bottom, …
You can tell that a precipitate has formed when the solution becomes cloudy and the solid either suddenly appears in the solution, settles to the bottom, or collects on another ob…
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what is a colorless, odorless, and poisonous gas found in cigarette smo…
Carbon monoxide
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find the evidence for physical changes and place them in the test tubes…
Physical changes.
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the warming of the earth (1970 - 2020) this table shows two things that…
1. 354.4 ppm 2. + 0.60 °C 3. 2020 4. When comparing the two columns, it is noticed that as the CO₂ level goes up, the temperature also seems to go up. This is because as the value…
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5) choose the best answer. carbonic acid and oxidation are examples of …
chemical
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4) choose the best answer. flowing water smoothing rocks in a stream is…
physical
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3) choose the best answer. — occurs when a rock is changed into a new s…
Chemical weathering
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2) choose the best answer. when rocks break down, changing in size and …
Physical weathering
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a raindrop has a mass of 50. mg and the pacific ocean has a mass of 7.0…
The mass of 1 mole of raindrops is \(3.0\times 10^{22}\space g\) and the number of moles of raindrops in the Pacific Ocean is \(24\)
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calculate the volume in milliliters of a 3.1 mol/l silver nitrate solut…
\(12\)
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bernie madoff, sentenced to 150 years in prison for creating a ponzi sc…
- **Question 1**: Corporate crime - **Question 2**: A violation of established contextual, cultural, or social norms, whether folkways, mores, or codified law.
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a ____________ is the general idea of objects, events, animals, or peop…
B. concept
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#14. charlie takes supplement that is labeled as atural.\ what does thi…
Nothing; "natural" is not verified by anyone.
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fill in the blank question a maximum of two electrons can occupy a sing…
Pauli Exclusion Principle
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fill in the blank question electrons in an atoms outermost orbitals are…
valence
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multiple choice question which element is represented with the orbital …
carbon
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fill in the blank question single electrons with the same spin must occ…
Hund's rule
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multiple choice question according to ____, a maximum of two electrons …
the Pauli exclusion principle
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multiple choice question what is the term for the electrons in an atoms…
valence electrons
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fill in the blank question the aufbau principle states that each electr…
lowest
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multiple choice question which element is represented with the orbital …
carbon
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matching question match the rule or principle to the step in the proces…
aufbau principle: Determine the lowest energy levels for the number of electrons in the atom in question. Hund's rule: Add electrons to orbitals of equal energy. Pauli exclusion p…
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true or false question true or false: the ground state configuration is…
False
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multiple choice question according to which of the following must singl…
C. Hund's rule
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fill in the blank question each major energy level, specified by n, is …
principal
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multiple choice question what is the term for the number assigned to ea…
quantum number
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multiple choice question the rule that each electron occupies the lowes…
the aufbau principle
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fill in the blank question principal energy level three consists of sub…
3
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multiple choice question principal energy levels are divided into energ…
C. sublevels
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multiple choice question the ground state configuration of electrons in…
lowest energy.
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multiple choice question which is the term for the major energy levels …
principal energy levels
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matching question match each principal energy level, at left, with the …
principal energy level 1 → one sublevel principal energy level 2 → two sublevels principal energy level 3 → three sublevels
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fill in the blank question the energy levels contained within a princip…
sub - levels
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fill in the blank question each major energy level, specified by ( n ),…
principal
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multiple choice question what does the principal quantum number indicat…
the relative size and energy of the atomic orbital
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fill in the blank question the number assigned to each orbit of an elec…
principal
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3.011) the best way to combat invasive species is to ___. a. physically…
3.011) D. prevent them from entering an area 3.012) A. invasive species 3.013) C. endemic species 3.014) C. wind 3.015) Endemic 3.016) Invasive 3.017) (Assuming an error, if force…
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what is the molecular geometry of xef4? seesaw tetrahedral square plana…
square planar
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what is the molecular geometry of sf₄? trigonal bipyramidal seesaw t - …
seesaw
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a cyclopropane - oxygen mixture is used as an anesthetic. if the partia…
\(1090\approx1100\) torr, so the answer is \(1100\ torr\) (the small difference is due to rounding in the problem - statement's approximated values).
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what temperature scale is used in gas law calculations?
The Kelvin scale.
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a gas at 5.00 atm pressure was stored in a tank during the winter at 5.…
5.63 atm
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is bcl₃ a polar or a nonpolar molecule? polar nonpolar
nonpolar
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question 21 4 pts according to the kinetic theory of gases, a gas can b…
the particles of a gas are very far apart
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how many moles of argon occupy a volume of 18.6 l at stp? 0.830 moles 8…
0.830 moles
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question 19 the temperature of a 250. ml sample of gas increases from 1…
750. mL
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which measurement describes the pressure of a gas? 725 torr 2.5 l 2.8 g…
725 torr
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air contains nitrogen, oxygen, argon, and only traces of other gases. i…
752 mmHg
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if 5.00 l of argon gas is at 0.460 atm and -123°c, what is the volume a…
4.19 L
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tyler dewitt-17min) multiple-choice question 14. how many valence elect…
A. Five
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a sample of neon gas at 1.20 atm expands from 0.125 l to 0.250 l. if th…
0.600 atm
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question 14 which of the following laws states that the volume of a gas…
Charles' Law
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a reaction that releases energy as it occurs is classified as a(n) ____…
exothermic reaction
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find the mass of alcl₃ that is produced when 25.0 grams of al₂o₃ reacts…
A. \(65.3\space g\)
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question 11 4 pts the following reaction is an example of a ______ reac…
combustion
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question 10 the number of moles of mgo produced when 0.20 mole of o₂ re…
\(0.40\space mol\) (the first option)
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in an oxidation - reduction reaction, the substance reduced always ____…
gains electrons
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multiple - choice question 13. what does boron and aluminum have in com…
C. Both A and B apply
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question 8 one mole of k₂cro₄ contains ______ moles of o. 4 6.02×10²³ 1…
4
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how many moles of na₂co₃ are in 52.0 g of na₂co₃? 0.491 mol 0.681 mol 0…
0.491 mol
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how many al atoms are in 2.50 mol al? 1.51 x 10²⁴ atoms 2.41 x 10²³ ato…
1.51 x 10²⁴ atoms
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how many moles of ar are in 7.52 x 10²² ar atoms? 0.125 mol 0.0125 mol …
A. \(0.125\space mol\)